ENGINE

EC
A

EC
SECTION
ENGINE CONTROL SYSTEM C

E
CONTENTS
VQ35DE THROTTLE VALVE CLOSED POSITION F
LEARNING : Description .........................................21
BASIC INSPECTION .................................... 9 THROTTLE VALVE CLOSED POSITION

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LEARNING : Special Repair Requirement ..............21 G
DIAGNOSIS AND REPAIR WORK FLOW ......... 9
Work Flow ................................................................. 9 IDLE AIR VOLUME LEARNING ................................21
Diagnostic Work Sheet ............................................ 12 IDLE AIR VOLUME LEARNING : Description .........21
IDLE AIR VOLUME LEARNING : Special Repair H
INSPECTION AND ADJUSTMENT ....................14 Requirement ............................................................21
BASIC INSPECTION ................................................. 14 EXHAUST VALVE TIMING CONTROL LEARNING
BASIC INSPECTION : Special Repair Require- I
....23
ment ........................................................................ 14 EXHAUST VALVE TIMING CONTROL LEARN-
ING : Description .....................................................23
ADDITIONAL SERVICE WHEN REPLACING J
EXHAUST VALVE TIMING CONTROL LEARN-
CONTROL UNIT ........................................................ 17
ING : Special Repair Requirement ..........................23
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description ................................ 17 MIXTURE RATIO SELF-LEARNING VALUE
ADDITIONAL SERVICE WHEN REPLACING K
CLEAR .......................................................................23
CONTROL UNIT : Special Repair Requirement .... 17 MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Description ................................................24
IDLE SPEED .............................................................. 19 L
MIXTURE RATIO SELF-LEARNING VALUE
IDLE SPEED : Description ...................................... 19
CLEAR : Special Repair Requirement .....................24
IDLE SPEED : Special Repair Requirement ........... 19

IGNITION TIMING ...................................................... 19

HOW TO SET SRT CODE ................................ 25 M
Description ...............................................................25
IGNITION TIMING : Description .............................. 19
SRT Set Driving Pattern ..........................................26
IGNITION TIMING : Special Repair Requirement.... 19
Work Procedure .......................................................28
N
VIN REGISTRATION ................................................. 20
VIN REGISTRATION : Description ......................... 20 HOW TO ERASE PERMANENT DTC .............. 31
VIN REGISTRATION : Special Repair Require- Description ...............................................................31
ment ........................................................................ 20 Work Procedure (Group A) ......................................32 O
Work Procedure (Group B) ......................................34
ACCELERATOR PEDAL RELEASED POSITION
LEARNING ................................................................ 20 SYSTEM DESCRIPTION ............................. 37
P
ACCELERATOR PEDAL RELEASED POSITION
LEARNING : Description ......................................... 20
ENGINE CONTROL SYSTEM .......................... 37
ACCELERATOR PEDAL RELEASED POSITION System Diagram .....................................................37
System Description ..................................................38
LEARNING : Special Repair Requirement .............. 20
Component Parts Location ....................................38
THROTTLE VALVE CLOSED POSITION LEARN- Component Description ...........................................43
ING ............................................................................. 20
MULTIPORT FUEL INJECTION SYSTEM ....... 45

Revision: August 2013 EC-1 2014 Maxima NAM

 System Diagram .................................................... 45 Component Parts Location .................................. 119
System Description ................................................. 45 Component Description ........................................ 124
Component Parts Location ................................... 48
Component Description .......................................... 53 FUEL FILLER CAP WARNING SYSTEM ........ 125
System Diagram ................................................... 125
ELECTRIC IGNITION SYSTEM ......................... 54 System Description ............................................... 125
System Diagram .................................................... 54
System Description ................................................. 54 ON BOARD DIAGNOSTIC (OBD) SYSTEM .... 127
Component Parts Location ................................... 55 Diagnosis Description ........................................... 127
Component Description .......................................... 60 GST (Generic Scan Tool) ..................................... 127

AIR CONDITIONING CUT CONTROL .............. 61 DIAGNOSIS SYSTEM (ECM) ........................... 128
System Diagram ..................................................... 61
DIAGNOSIS DESCRIPTION ................................... 128
System Description ................................................. 61
DIAGNOSIS DESCRIPTION : 1st Trip Detection
Component Parts Location ................................... 62
Logic and Two Trip Detection Logic ...................... 128
Component Description .......................................... 67
DIAGNOSIS DESCRIPTION : DTC and Freeze
AUTOMATIC SPEED CONTROL DEVICE Frame Data ........................................................... 128
(ASCD) ............................................................... 68 DIAGNOSIS DESCRIPTION : Counter System .... 129
DIAGNOSIS DESCRIPTION : Driving Pattern ...... 132
System Diagram ..................................................... 68
DIAGNOSIS DESCRIPTION : System Readiness
System Description ................................................. 68
Test (SRT) Code ................................................... 133

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Component Parts Location ................................... 69
DIAGNOSIS DESCRIPTION : Permanent Diag-
Component Description ......................................... 75
nostic Trouble Code (Permanent DTC) ................ 134
CAN COMMUNICATION ................................... 76 DIAGNOSIS DESCRIPTION : Malfunction Indica-
System Description ................................................. 76 tor Lamp (MIL) ...................................................... 135
On Board Diagnosis Function ............................... 135
COOLING FAN CONTROL ............................... 77 CONSULT Function .............................................. 138
System Diagram ..................................................... 77
System Description ................................................. 77 DTC/CIRCUIT DIAGNOSIS ....................... 149
Component Parts Location ................................... 79
Component Description .......................................... 84 TROUBLE DIAGNOSIS - SPECIFICATION
VALUE .............................................................. 149
ELECTRONIC CONTROLLED ENGINE Description ............................................................ 149
MOUNT .............................................................. 85 Component Function Check ................................. 149
System Diagram ..................................................... 85 Diagnosis Procedure ............................................. 150
System Description ................................................. 85
Component Parts Location ................................... 88 POWER SUPPLY AND GROUND CIRCUIT .... 157
Component Description ......................................... 93 Diagnosis Procedure ............................................. 157

EVAPORATIVE EMISSION SYSTEM ............... 94 U0101 CAN COMM CIRCUIT ........................... 160
System Diagram ..................................................... 94 Description ............................................................ 160
System Description ................................................. 94 DTC Logic ............................................................. 160
Component Parts Location ................................... 97 Diagnosis Procedure ............................................. 160
Component Description ........................................102 U1001 CAN COMM CIRCUIT ........................... 161
EXHAUST VALVE TIMING CONTROL ........... 103 Description ............................................................ 161
System Diagram ....................................................103 DTC Logic ............................................................. 161
System Description ................................................103 Diagnosis Procedure ............................................. 161
Component Parts Location ..................................104 P0011, P0021 IVT CONTROL .......................... 162
Component Description .........................................109
DTC Logic ............................................................. 162
INTAKE VALVE TIMING CONTROL ............... 110 Diagnosis Procedure ............................................. 163
System Diagram ....................................................110 Component Inspection .......................................... 164
System Description ................................................110 P0014, P0024 EVT CONTROL ......................... 166
Component Parts Location ..................................111 DTC Logic ............................................................. 166
Component Description .........................................116 Diagnosis Procedure ............................................. 167
VARIABLE INDUCTION AIR SYSTEM ........... 117 Component Inspection .......................................... 168
System Diagram ....................................................117 P0031, P0032, P0051, P0052 A/F SENSOR 1
System Description ................................................117
HEATER ........................................................... 170
Revision: August 2013 EC-2 2014 Maxima NAM
 Description ............................................................ 170 Diagnosis Procedure ............................................. 205
DTC Logic ............................................................. 170 Component Inspection ........................................... 205 A
Diagnosis Procedure ............................................. 170
Component Inspection .......................................... 172 P0122, P0123 TP SENSOR ............................ 207
Description ............................................................. 207
P0037, P0038, P0057, P0058 HO2S2 HEAT- DTC Logic .............................................................. 207 EC
ER ..................................................................... 173 Diagnosis Procedure ............................................. 207
Description ............................................................ 173 Component Inspection ........................................... 209
DTC Logic ............................................................. 173 Special Repair Requirement .................................. 209 C
Diagnosis Procedure ............................................. 174
Component Inspection .......................................... 175 P0125 ECT SENSOR ...................................... 210
Description ............................................................. 210
D
P0075, P0081 IVT CONTROL SOLENOID DTC Logic .............................................................. 210
VALVE .............................................................. 177 Diagnosis Procedure ............................................. 211
Description ............................................................ 177 Component Inspection ........................................... 211
DTC Logic ............................................................. 177 E
Diagnosis Procedure ............................................. 177
P0127 IAT SENSOR ....................................... 213
Description ............................................................. 213
Component Inspection .......................................... 178
DTC Logic .............................................................. 213 F
P0078, P0084 EVT CONTROL MAGNET RE- Diagnosis Procedure ............................................. 214
TARDER ........................................................... 180 Component Inspection ........................................... 214

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Description ............................................................ 180
P0128 THERMOSTAT FUNCTION ................. 215 G
DTC Logic ............................................................. 180
DTC Logic .............................................................. 215
Diagnosis Procedure ............................................. 180
Diagnosis Procedure ............................................. 216
Component Inspection .......................................... 181
Component Inspection ........................................... 216 H
P0101 MAF SENSOR ....................................... 183
P0130, P0150 A/F SENSOR 1 ........................ 218
Description ............................................................ 183
Description ............................................................. 218
DTC Logic ............................................................. 183 I
DTC Logic .............................................................. 218
Diagnosis Procedure ............................................. 184
Component Function Check .................................. 220
Component Inspection .......................................... 185
Diagnosis Procedure ............................................. 220
P0102, P0103 MAF SENSOR .......................... 189 J
P0131, P0151 A/F SENSOR 1 ........................ 222
Description ............................................................ 189
Description ............................................................. 222
DTC Logic ............................................................. 189
DTC Logic .............................................................. 222
Diagnosis Procedure ............................................. 190 K
Diagnosis Procedure ............................................. 223
Component Inspection .......................................... 191
P0132, P0152 A/F SENSOR 1 ........................ 226
P0111 IAT SENSOR ......................................... 195
Description ............................................................. 226 L
Description ............................................................ 195
DTC Logic .............................................................. 226
DTC Logic ............................................................. 195
Diagnosis Procedure ............................................. 227
Component Function Check .................................. 196
Diagnosis Procedure ............................................. 196 P0137, P0157 HO2S2 ..................................... 230 M
Component Inspection .......................................... 197 Description ............................................................. 230
DTC Logic .............................................................. 230
P0112, P0113 IAT SENSOR ............................ 198
Component Function Check .................................. 231 N
Description ............................................................ 198
Diagnosis Procedure ............................................. 233
DTC Logic ............................................................. 198
Component Inspection ........................................... 235
Diagnosis Procedure ............................................. 199
Component Inspection .......................................... 199 P0138, P0158 HO2S2 ..................................... 237 O
Description ............................................................. 237
P0116 ECT SENSOR ....................................... 201
DTC Logic .............................................................. 237
Description ............................................................ 201
Component Function Check .................................. 239 P
DTC Logic ............................................................. 201
Diagnosis Procedure ............................................. 240
Component Function Check .................................. 202
Component Inspection ........................................... 244
Diagnosis Procedure ............................................. 203
Component Inspection .......................................... 203 P0139, P0159 HO2S2 ..................................... 247
Description ............................................................. 247
P0117, P0118 ECT SENSOR ........................... 204
DTC Logic .............................................................. 247
Description ............................................................ 204
Component Function Check .................................. 249
DTC Logic ............................................................. 204

Revision: August 2013 EC-3 2014 Maxima NAM

 Diagnosis Procedure .............................................250 Component Inspection .......................................... 294
Component Inspection ...........................................252
P0335 CKP SENSOR (POS) ............................ 296
P014C, P014D, P014E, P014F, P015A, Description ............................................................ 296
P015B, P015C, P015D A/F SENSOR 1 .......... 255 DTC Logic ............................................................. 296
Description .............................................................255 Diagnosis Procedure ............................................. 297
DTC Logic ..............................................................255 Component Inspection .......................................... 299
Diagnosis Procedure .............................................257
P0340, P0345 CMP SENSOR (PHASE) .......... 300
P0171, P0174 FUEL INJECTION SYSTEM Description ............................................................ 300
FUNCTION ....................................................... 261 DTC Logic ............................................................. 300
DTC Logic ..............................................................261 Diagnosis Procedure ............................................. 301
Diagnosis Procedure .............................................262 Component Inspection .......................................... 302

P0172, P0175 FUEL INJECTION SYSTEM P0420, P0430 THREE WAY CATALYST
FUNCTION ....................................................... 265 FUNCTION ........................................................ 304
DTC Logic ..............................................................265 DTC Logic ............................................................. 304
Diagnosis Procedure .............................................266 Component Function Check ................................. 305
Diagnosis Procedure ............................................. 306
P0181 FTT SENSOR ....................................... 269
Description .............................................................269 P0441 EVAP CONTROL SYSTEM .................. 310
DTC Logic ............................................................. 310

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DTC Logic ..............................................................269
Component Function Check ..................................271 Component Function Check ................................. 311
Diagnosis Procedure .............................................271 Diagnosis Procedure ............................................. 312
Component Inspection ...........................................272 Component Inspection .......................................... 315

P0182, P0183 FTT SENSOR ........................... 274 P0442 EVAP CONTROL SYSTEM .................. 316
Description .............................................................274 DTC Logic ............................................................. 316
DTC Logic ..............................................................274 Diagnosis Procedure ............................................. 317
Diagnosis Procedure .............................................274 Component Inspection .......................................... 321
Component Inspection ...........................................276
P0443 EVAP CANISTER PURGE VOLUME
P0196 EOT SENSOR ...................................... 277 CONTROL SOLENOID VALVE ........................ 323
Description .............................................................277 Description ............................................................ 323
DTC Logic ..............................................................277 DTC Logic ............................................................. 323
Component Function Check ..................................279 Diagnosis Procedure ............................................. 324
Diagnosis Procedure .............................................280 Component Inspection .......................................... 327
Component Inspection ...........................................280
P0444, P0445 EVAP CANISTER PURGE
P0197, P0198 EOT SENSOR .......................... 281 VOLUME CONTROL SOLENOID VALVE ....... 329
Description .............................................................281 Description ............................................................ 329
DTC Logic ..............................................................281 DTC Logic ............................................................. 329
Diagnosis Procedure .............................................282 Diagnosis Procedure ............................................. 329
Component Inspection ...........................................282 Component Inspection .......................................... 331

P0222, P0223 TP SENSOR ............................. 284 P0447 EVAP CANISTER VENT CONTROL
Description .............................................................284 VALVE .............................................................. 333
DTC Logic ..............................................................284 Description ............................................................ 333
Diagnosis Procedure .............................................284 DTC Logic ............................................................. 333
Component Inspection ...........................................286 Diagnosis Procedure ............................................. 333
Special Repair Requirement ..................................286 Component Inspection .......................................... 335
P0300, P0301, P0302, P0303, P0304, P0305, P0448 EVAP CANISTER VENT CONTROL
P0306 MISFIRE ............................................... 287 VALVE .............................................................. 338
DTC Logic ..............................................................287 Description ............................................................ 338
Diagnosis Procedure .............................................288 DTC Logic ............................................................. 338
Diagnosis Procedure ............................................. 339
P0327, P0328, P0332, P0333 KS .................... 293 Component Inspection .......................................... 340
Description .............................................................293
DTC Logic ..............................................................293 P0451 EVAP CONTROL SYSTEM PRES-
Diagnosis Procedure .............................................293 SURE SENSOR ..............................................
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 Description ............................................................ 343 P050A, P050E COLD START CONTROL ...... 384
DTC Logic ............................................................. 343 Description ............................................................. 384 A
Diagnosis Procedure ............................................. 344 DTC Logic .............................................................. 384
Component Inspection .......................................... 346 Diagnosis Procedure ............................................. 385
P0452 EVAP CONTROL SYSTEM PRES- P0550 PSP SENSOR ...................................... 386 EC
SURE SENSOR ................................................ 347 Description ............................................................. 386
Description ............................................................ 347 DTC Logic .............................................................. 386
DTC Logic ............................................................. 347 Diagnosis Procedure ............................................. 386 C
Diagnosis Procedure ............................................. 348 Component Inspection ........................................... 387
Component Inspection .......................................... 350
P0603 ECM POWER SUPPLY ....................... 389 D
P0453 EVAP CONTROL SYSTEM PRES- Description ............................................................. 389
SURE SENSOR ................................................ 352 DTC Logic .............................................................. 389
Description ............................................................ 352 Diagnosis Procedure ............................................. 389
DTC Logic ............................................................. 352 E
Diagnosis Procedure ............................................. 353 P0605 ECM ..................................................... 391
Component Inspection .......................................... 356 Description ............................................................. 391
DTC Logic .............................................................. 391 F
P0455 EVAP CONTROL SYSTEM .................. 358 Diagnosis Procedure ............................................. 392
DTC Logic ............................................................. 358
P0607 ECM ..................................................... 393

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Diagnosis Procedure ............................................. 360
Description ............................................................. 393 G
Component Inspection .......................................... 362
DTC Logic .............................................................. 393
P0456 EVAP CONTROL SYSTEM .................. 364 Diagnosis Procedure ............................................. 393
DTC Logic ............................................................. 364 H
Component Function Check .................................. 366 P0643 SENSOR POWER SUPPLY ................ 394
Diagnosis Procedure ............................................. 366 DTC Logic .............................................................. 394
Component Inspection .......................................... 370 Diagnosis Procedure ............................................. 394
I
P0460 FUEL LEVEL SENSOR ........................ 372 P0850 PNP SWITCH ....................................... 397
Description ............................................................ 372 Description ............................................................. 397
DTC Logic ............................................................. 372 DTC Logic .............................................................. 397 J
Diagnosis Procedure ............................................. 372 Component Function Check .................................. 398
Diagnosis Procedure ............................................. 398
P0461 FUEL LEVEL SENSOR ........................ 374
P1078, P1084 EVT CONTROL POSITION K
Description ............................................................ 374
DTC Logic ............................................................. 374 SENSOR .......................................................... 400
Component Function Check .................................. 374 Description ............................................................. 400
Diagnosis Procedure ............................................. 375 DTC Logic .............................................................. 400 L
Diagnosis Procedure ............................................. 400
P0462, P0463 FUEL LEVEL SENSOR ............ 376 Component Inspection ........................................... 402
Description ............................................................ 376 M
DTC Logic ............................................................. 376 P1148, P1168 CLOSED LOOP CONTROL .... 403
Diagnosis Procedure ............................................. 376 DTC Logic .............................................................. 403

P0500 VSS ....................................................... 378 P1211 TCS CONTROL UNIT .......................... 404 N
Description ............................................................ 378 Description ............................................................. 404
DTC Logic ............................................................. 378 DTC Logic .............................................................. 404
Diagnosis Procedure ............................................. 378 Diagnosis Procedure ............................................. 404
O
P0506 ISC SYSTEM ......................................... 380 P1212 TCS COMMUNICATION LINE ............. 405
Description ............................................................ 380 Description ............................................................. 405
DTC Logic ............................................................. 380 DTC Logic .............................................................. 405 P
Diagnosis Procedure ............................................. 380 Diagnosis Procedure ............................................. 405

P0507 ISC SYSTEM ......................................... 382 P1217 ENGINE OVER TEMPERATURE ........ 406
Description ............................................................ 382 DTC Logic .............................................................. 406
DTC Logic ............................................................. 382 Component Function Check .................................. 406
Diagnosis Procedure ............................................. 382 Diagnosis Procedure ............................................. 407

P1225 TP SENSOR ......................................... 410

Revision: August 2013 EC-5 2014 Maxima NAM
 Description .............................................................410 Diagnosis Procedure ............................................. 438
DTC Logic ..............................................................410
Diagnosis Procedure .............................................410 P1720 VSS ........................................................ 440
Special Repair Requirement ..................................411 Description ............................................................ 440
DTC Logic ............................................................. 440
P1226 TP SENSOR ......................................... 412 Diagnosis Procedure ............................................. 440
Description .............................................................412
DTC Logic ..............................................................412 P1800 VIAS CONTROL SOLENOID VALVE 1.. 442
Diagnosis Procedure .............................................412 Description ............................................................ 442
Special Repair Requirement ..................................413 DTC Logic ............................................................. 442
Diagnosis Procedure ............................................. 442
P1550 BATTERY CURRENT SENSOR .......... 414 Component Inspection .......................................... 443
Description .............................................................414
DTC Logic ..............................................................414 P1801 VIAS CONTROL SOLENOID VALVE 2.. 445
Diagnosis Procedure .............................................414 Description ............................................................ 445
Component Inspection ...........................................415 DTC Logic ............................................................. 445
Diagnosis Procedure ............................................. 445
P1551, P1552 BATTERY CURRENT SEN- Component Inspection .......................................... 446
SOR .................................................................. 417
Description .............................................................417 P1805 BRAKE SWITCH ................................... 448
DTC Logic ..............................................................417 Description ............................................................ 448
DTC Logic ............................................................. 448

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Diagnosis Procedure .............................................417
Component Inspection ...........................................419 Diagnosis Procedure ............................................. 448
Component Inspection (Stop Lamp Switch) .......... 449
P1553 BATTERY CURRENT SENSOR .......... 420
Description .............................................................420 P2096, P2097, P2098, P2099 A/F SENSOR 1.. 451
DTC Logic ..............................................................420 Description ............................................................ 451
Diagnosis Procedure .............................................420 DTC Logic ............................................................. 451
Component Inspection ...........................................421 Diagnosis Procedure ............................................. 452

P1554 BATTERY CURRENT SENSOR .......... 423 P2100, P2103 THROTTLE CONTROL MO-
Description .............................................................423 TOR RELAY ..................................................... 456
DTC Logic ..............................................................423 Description ............................................................ 456
Component Function Check ..................................423 DTC Logic ............................................................. 456
Diagnosis Procedure .............................................424 Diagnosis Procedure ............................................. 456
Component Inspection ...........................................425
P2101 ELECTRIC THROTTLE CONTROL
P1564 ASCD STEERING SWITCH ................. 426 FUNCTION ........................................................ 458
Description .............................................................426 Description ............................................................ 458
DTC Logic ..............................................................426 DTC Logic ............................................................. 458
Diagnosis Procedure .............................................426 Diagnosis Procedure ............................................. 458
Component Inspection ...........................................428 Component Inspection .......................................... 460
Special Repair Requirement ................................. 461
P1572 ASCD BRAKE SWITCH ....................... 429
Description .............................................................429 P2118 THROTTLE CONTROL MOTOR .......... 462
DTC Logic ..............................................................429 Description ............................................................ 462
Diagnosis Procedure .............................................430 DTC Logic ............................................................. 462
Component Inspection (ASCD Brake Switch) .......433 Diagnosis Procedure ............................................. 462
Component Inspection (Stop Lamp Switch) ..........433 Component Inspection .......................................... 463
Special Repair Requirement ................................. 464
P1574 ASCD VEHICLE SPEED SENSOR ...... 435
Description .............................................................435 P2119 ELECTRIC THROTTLE CONTROL
DTC Logic ..............................................................435 ACTUATOR ...................................................... 465
Diagnosis Procedure .............................................435 Description ............................................................ 465
DTC Logic ............................................................. 465
P1700 CVT CONTROL SYSTEM .................... 437 Diagnosis Procedure ............................................. 466
Description .............................................................437 Special Repair Requirement ................................. 466
P1715 INPUT SPEED SENSOR ...................... 438 P2122, P2123 APP SENSOR ........................... 467
Description .............................................................438 Description ............................................................ 467
DTC Logic ..............................................................438 DTC Logic ............................................................

Revision: August 2013 EC-6 2014 Maxima NAM

 Diagnosis Procedure ............................................. 467 FUEL PUMP .................................................... 499
Component Inspection .......................................... 469 Description ............................................................. 499 A
Special Repair Requirement ................................. 469 Component Function Check .................................. 499
Diagnosis Procedure ............................................. 499
P2127, P2128 APP SENSOR ........................... 470 Component Inspection ........................................... 501
Description ............................................................ 470 EC
DTC Logic ............................................................. 470 IGNITION SIGNAL .......................................... 502
Diagnosis Procedure ............................................. 470 Description ............................................................. 502
Component Inspection .......................................... 472 Component Function Check .................................. 502 C
Special Repair Requirement ................................. 473 Diagnosis Procedure ............................................. 502
Component Inspection (Ignition Coil with Power
P2135 TP SENSOR .......................................... 474 Transistor) ............................................................. 505 D
Description ............................................................ 474 Component Inspection (Condenser) ...................... 506
DTC Logic ............................................................. 474
Diagnosis Procedure ............................................. 474 MALFUNCTION INDICATOR LAMP .............. 507
Component Inspection .......................................... 476 Description ............................................................. 507 E
Special Repair Requirement ................................. 476 Component Function Check .................................. 507
Diagnosis Procedure ............................................. 507
P2138 APP SENSOR ....................................... 477 F
Description ............................................................ 477 ON BOARD REFUELING VAPOR RECOV-
DTC Logic ............................................................. 477 ERY (ORVR) .................................................... 508

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Diagnosis Procedure ............................................. 478 Description ............................................................. 508
Component Inspection .......................................... 480 G
Component Function Check .................................. 508
Special Repair Requirement ................................. 480 Diagnosis Procedure ............................................. 508
Component Inspection ........................................... 511
ASCD BRAKE SWITCH ................................... 482 H
Description ............................................................ 482 POSITIVE CRANKCASE VENTILATION ....... 514
Component Function Check .................................. 482 Description ............................................................. 514
Diagnosis Procedure ............................................. 482 Component Inspection ........................................... 514 I
Component Inspection (ASCD Brake Switch) ....... 483
REFRIGERANT PRESSURE SENSOR .......... 515
ASCD INDICATOR ........................................... 485 Description ............................................................. 515
Description ............................................................ 485 Component Function Check .................................. 515 J
Component Function Check .................................. 485 Diagnosis Procedure ............................................. 515
Diagnosis Procedure ............................................. 485
VARIABLE INDUCTION AIR SYSTEM .......... 518
COOLING FAN ................................................. 486 K
Description ............................................................. 518
Description ............................................................ 486 Component Function Check .................................. 518
Component Function Check .................................. 486 Diagnosis Procedure ............................................. 519
Diagnosis Procedure ............................................. 486 L
Component Inspection (Cooling Fan Motor) ......... 489 ECU DIAGNOSIS INFORMATION ............ 522
Component Inspection (Cooling Fan Relay) ......... 490
ECM ................................................................. 522
M
ELECTRICAL LOAD SIGNAL ......................... 491 Reference Value .................................................... 522
Description ............................................................ 491 Fail safe ................................................................. 538
Component Function Check .................................. 491 DTC Inspection Priority Chart ............................. 540
Diagnosis Procedure ............................................. 491 DTC Index ............................................................. 542 N
Test Value and Test Limit ...................................... 546
ELECTRONIC CONTROLLED ENGINE
MOUNT ............................................................. 493 WIRING DIAGRAM .................................... 554 O
Description ............................................................ 493
Component Function Check .................................. 493 ENGINE CONTROL SYSTEM ........................ 554
Diagnosis Procedure ............................................. 493 Wiring Diagram ...................................................... 554
Component Inspection .......................................... 495 P
SYMPTOM DIAGNOSIS ............................ 581
FUEL INJECTOR ............................................. 496
Description ............................................................ 496
ENGINE CONTROL SYSTEM SYMPTOMS ... 581
Component Function Check .................................. 496 Symptom Table ..................................................... 581
Diagnosis Procedure ............................................. 496 NORMAL OPERATING CONDITION ............. 585
Component Inspection .......................................... 498 Description ............................................................. 585

Revision: August 2013 EC-7 2014 Maxima NAM

PRECAUTION ............................................ 586 FUEL PRESSURE ............................................ 592
Inspection .............................................................. 592
PRECAUTIONS ............................................... 586
Precaution for Supplemental Restraint System EVAP LEAK CHECK ........................................ 594
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Inspection .............................................................. 594
SIONER" ................................................................586
On Board Diagnostic (OBD) System of Engine SERVICE DATA AND SPECIFICATIONS
and CVT ................................................................586 (SDS) ......................................................... 596
General Precautions ..............................................587
SERVICE DATA AND SPECIFICATIONS
PREPARATION .......................................... 590 (SDS) ................................................................ 596
Idle Speed ............................................................. 596
PREPARATION ............................................... 590 Ignition Timing ....................................................... 596
Special Service Tools ............................................590 Calculated Load Value .......................................... 596
Commercial Service Tools .....................................590 Mass Air Flow Sensor ........................................... 596
PERIODIC MAINTENANCE ....................... 592

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Revision: August 2013 EC-8 2014 Maxima NAM

 DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION > [VQ35DE]

BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORK FLOW
Work Flow INFOID:0000000010094770
EC

OVERALL SEQUENCE
C

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G

JSBIA0123GB

DETAILED FLOW

Revision: August 2013 EC-9 2014 Maxima NAM

 DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION > [VQ35DE]

1.GET INFORMATION FOR SYMPTOM

1. Get the detailed information from the customer about the symptom (the condition and the environment
when the incident/malfunction occurred) using the “Diagnostic Work Sheet”. (Refer to EC-12, "Diagnostic
Work Sheet".)
2. Ask if the customer requests I/M examination.

Malfunction information, obtained>>GO TO 2.

No malfunction information, but a request for I/M examination>>GO TO 13.
2.CHECK DTC
1. Check DTC.
2. Perform the following procedure if DTC is displayed.
- Record DTC and freeze frame data. (Print them out with CONSULT or GST.)
- Erase DTC. (Refer to EC-135, "On Board Diagnosis Function" or EC-138, "CONSULT Function".)
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
(Symptom Table is useful. Refer to EC-581, "Symptom Table".)
3. Check related service bulletins for information.
Are any symptoms described and any DTCs detected?
Symptom is described, DTC is displayed>>GO TO 3.
Symptom is described, DTC is not displayed>>GO TO 4.

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Symptom is not described, DTC is displayed>>GO TO 5.
3.CONFIRM THE SYMPTOM
Try to confirm the symptom described by the customer (except MIL ON).
Also study the normal operation and fail-safe related to the symptom. Refer to EC-585, "Description" and EC-
538, "Fail safe".
Diagnosis Work Sheet is useful to verify the incident.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.
4.CONFIRM THE SYMPTOM
Try to confirm the symptom described by the customer.
Also study the normal operation and fail-safe related to the symptom. Refer to EC-585, "Description" and EC-
538, "Fail safe".
Diagnosis Work Sheet is useful to verify the incident.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.
5.PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC CONFIRMATION PROCEDURE for the displayed DTC, and then check that DTC is detected
again.
If two or more DTCs are detected, refer to EC-540, "DTC Inspection Priority Chart" and determine trouble
diagnosis order.
NOTE:
• Freeze frame data is useful if the DTC is not detected.
• Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service
Manual. This simplified check procedure is an effective alternative though DTC cannot be detected during
this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR-
MATION PROCEDURE.
Is DTC detected?
YES >> GO TO 10.
NO >> Check according to GI-41, "Intermittent Incident".
6.PERFORM BASIC INSPECTION
Perform EC-14, "BASIC INSPECTION : Special Repair Requirement".
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Will CONSULT be used?
YES >> GO TO 7. A
NO >> GO TO 9.
7.PERFORM “SPEC” OF “DATA MONITOR” MODE
EC
With CONSULT
Check that “MAS A/F SE-B1”, “B/FUEL SCHDL”, “A/F ALPHA-B1” and “A/F ALPHA-B2” are within the SP
value using CONSULT in “SPEC” of “DATA MONITOR” mode. Refer to EC-149, "Component Function
Check". C
Are they within the SP value?
YES >> GO TO 9.
D
NO >> GO TO 8.
8.DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Detect malfunctioning part according to EC-150, "Diagnosis Procedure". E
Is a malfunctioning part detected?
YES >> GO TO 11.
NO >> GO TO 9. F
9.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE

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Detect malfunctioning system according to EC-581, "Symptom Table" based on the confirmed symptom in G
step 4, and determine the trouble diagnosis order based on possible causes and symptoms.

>> GO TO 10. H
10.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Inspect according to Diagnostic Procedure of the system.
NOTE: I
The Diagnostic Procedure in EC section described based on open circuit inspection. A short circuit inspection
is also required for the circuit check in the Diagnostic Procedure. For details, refer to “Circuit Inspection” in GI-
44, "Circuit Inspection". J
Is a malfunctioning part detected?
YES >> GO TO 11.
NO >> Monitor input data from related sensors or check voltage of related ECM terminals using CON- K
SULT. Refer to EC-522, "Reference Value".
11.REPAIR OR REPLACE THE MALFUNCTIONING PART
1. Repair or replace the malfunctioning part. L
2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.
3. Check DTC. If DTC is displayed, erase it, refer to EC-135, "On Board Diagnosis Function" or EC-138, M
"CONSULT Function".

>> GO TO 12. N
12.FINAL CHECK
When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall Function Check again,
O
and then check that the malfunction have been completely repaired.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and check that
the symptom is not detected.
Is DTC detected and does symptom remain? P
YES-1 >> DTC is detected: GO TO 10.
YES-2 >> Symptom remains: GO TO 6.
NO-1 >> No request for I/M examination from the customer: Before returning the vehicle to the customer,
always erase unnecessary DTC in ECM and TCM (Transmission Control Module). Refer to EC-
135, "On Board Diagnosis Function" or EC-138, "CONSULT Function".
NO-2 >> I/M examination, requested from the customer: GO TO 13.

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 DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION > [VQ35DE]

13.PREPARE FOR I/M EXAMINATION

1. Set SRT codes. Refer to EC-26, "SRT Set Driving Pattern".
2. Erase permanent DTCs. Refer to EC-138, "CONSULT Function".

>> INSPECTION END

Diagnostic Work Sheet INFOID:0000000010094771

DESCRIPTION
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about symptoms. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the WORKSHEET SAMPLE
below in order to organize all the information for troubleshooting.
Some conditions may cause the MIL to illuminate or blink, and DTC
to be detected. Examples:
• Vehicle ran out of fuel, which caused the engine to misfire.

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SEF907L
• Fuel filler cap was left off or incorrectly screwed on, allowing fuel to
evaporate into the atmosphere.

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 DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION > [VQ35DE]
WORKSHEET SAMPLE
A

EC

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G

L
MTBL0017

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 INSPECTION AND ADJUSTMENT
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INSPECTION AND ADJUSTMENT
BASIC INSPECTION
BASIC INSPECTION : Special Repair Requirement INFOID:0000000010094772

1.INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
- Harness connectors for improper connections
- Wiring harness for improper connections, pinches and cut
- Vacuum hoses for splits, kinks and improper connections
- Hoses and ducts for leakage
- Air cleaner clogging
- Gasket
3. Check that electrical or mechanical loads are not applied.
- Head lamp switch is OFF.
- Air conditioner switch is OFF.
- Rear window defogger switch is OFF.
SEF983U
- Steering wheel is in the straight-ahead position, etc.

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4. Start engine and warm it up until engine coolant temperature
indicator points to the middle of gauge.
Ensure engine stays below 1,000 rpm.

SEF976U

5. Run engine at about 2,000 rpm for about 2 minutes under no

load.
6. Check that no DTC is displayed with CONSULT or GST.
Are any DTCs detected?
YES >> GO TO 2.
NO >> GO TO 3.

SEF977U

2.REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.

>> GO TO 3
3.CHECK TARGET IDLE SPEED
1. Run engine at about 2,000 rpm for about 2 minutes under no load.

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 INSPECTION AND ADJUSTMENT
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2. Rev engine between 2,000 and 3,000 rpm two or three times
under no load, then run engine at idle speed for about 1 minute. A
3. Check idle speed.
For procedure, refer to EC-19, "IDLE SPEED : Special Repair
Requirement".
EC
For specification, refer to EC-596, "Idle Speed".
Is the inspection result normal?
YES >> GO TO 10.
C
NO >> GO TO 4.

PBIA8513J

4.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING D

1. Stop engine.
2. Perform EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
E
ment".

>> GO TO 5.
F
5.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

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G
>> GO TO 6.
6.PERFORM IDLE AIR VOLUME LEARNING H
Perform EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 7. I
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4.
7.CHECK TARGET IDLE SPEED AGAIN J
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
For procedure, refer to EC-19, "IDLE SPEED : Special Repair Requirement".
For specification, refer to EC-596, "Idle Speed". K
Is the inspection result normal?
YES >> GO TO 10.
L
NO >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the Following. M
• Check camshaft position sensor (PHASE) and circuit. Refer to EC-301, "Diagnosis Procedure".
• Check crankshaft position sensor (POS) and circuit. Refer to EC-297, "Diagnosis Procedure".
Is the inspection result normal? N
YES >> GO TO 9.
NO >> 1. Repair or replace malfunctioning part.
2. GO TO 4.
O
9.CHECK ECM FUNCTION
1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,
although this is rare.) P
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".

>> GO TO 4.
10.CHECK IGNITION TIMING
1. Run engine at idle.
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 INSPECTION AND ADJUSTMENT
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2. Check ignition timing with a timing light.
For procedure, refer to EC-19, "IGNITION TIMING : Special Repair Requirement".
For specification, refer to EC-596, "Ignition Timing".
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 11.
11.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".

>> GO TO 12.
12.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

>> GO TO 13.
13.PERFORM IDLE AIR VOLUME LEARNING

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Perform EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 14.
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4.
14.CHECK TARGET IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
For procedure, refer to EC-19, "IDLE SPEED : Special Repair Requirement".
For specification, refer to EC-596, "Idle Speed".
Is the inspection result normal?
YES >> GO TO 15.
NO >> GO TO 17.
15.CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
For procedure, refer to EC-19, "IGNITION TIMING : Special Repair Requirement".
For specification, refer to EC-596, "Ignition Timing".
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 16.
16.CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-64, "Removal and Installation".
Is the inspection result normal?
YES >> GO TO 17.
NO >> 1. Repair the timing chain installation.
2. GO TO 4.
17.DETECT MALFUNCTIONING PART
Check the following.
• Check camshaft position sensor (PHASE) and circuit. Refer to EC-301, "Diagnosis Procedure".
• Check crankshaft position sensor (POS) and circuit. Refer to EC-297, "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 18.
NO >> 1. Repair or replace malfunctioning part.

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 INSPECTION AND ADJUSTMENT
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2. GO TO 4.
18.CHECK ECM FUNCTION A

1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,
although this is rare.)
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to EC
EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".

C
>> GO TO 4.
19.INSPECTION END
Did you replace ECM, referring this Basic Inspection procedure? D
Yes or No
Yes >> Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair
Requirement". E
No >> INSPECTION END
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
F
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Description
INFOID:0000000010094773

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When replacing ECM, the following procedure must be performed. (For details, refer to EC-17, "ADDITIONAL G
SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".)
PROGRAMMING OPERATION
NOTE: H
After replacing with a blank ECM, programming is required to write ECM information. Be sure to follow the pro-
cedure to perform the programming.
I
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Re-
quirement INFOID:0000000010094774

1.SAVE ECM DATA J

With CONSULT
1. Turn ignition switch OFF. K
2. Reconnect all harness connectors disconnected.
3. Turn ignition switch ON.
4. Select “SAVING DATA FOR REPLC CPU” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.
5. Follow the instruction of CONSULT display. L
NOTE:
• Necessary data in ECM is copied and saved to CONSULT.
• Go to Step 2 regardless of with or without success in saving data. M

>> GO TO 2.
2.CHECK ECM PART NUMBER N

Check ECM part number to see whether it is blank ECM or not.

NOTE:
O
• Part number of blank ECM is 23703 - ×××××.
• Check part number when ordering ECM or the one included in the label on the container box.
Is the ECM a blank ECM?
P
YES >> GO TO 3.
NO >> GO TO 5.
3.SAVE ECM PART NUMBER
Read out the part number from the old ECM and save the number, following the programming instructions.
Refer to CONSULT Operation Manual.
NOTE:
• The ECM part number is saved in CONSULT.

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• Even when ECM part number is not saved in CONSULT, go to 4.

>> GO TO 4.
4.PERFORM ECM PROGRAMMING
After replacing ECM, perform the ECM programming. Refer to CONSULT Operation Manual.
NOTE:
During programming, maintain the following conditions:
• Ignition switch: ON
• Electric load: OFF
• Brake pedal: Not depressed
• Battery voltage: 12 – 13.5 V (Be sure to check the value of battery voltage by selecting “BATTERY VOLT” in
“Data monitor” of CONSULT.)

>> GO TO 6.
5.REPLACE ECM
Replace ECM.

>> GO TO 6.

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6.PERFORM INITIALIZATION OF IVIS (NATS) SYSTEM AND REGISTRATION OF ALL IVIS (NATS) IGNI-
TION KEY IDS
Refer to SEC-9, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement".

>> GO TO 7.
7.CHECK ECM DATA STATUS
Check if the data is successfully copied from the ECM at Step 1 (before replacement) and saved in CONSULT.
Is the data saved successfully?
YES >> GO TO 8.
NO >> GO TO 9.
8.WRITE ECM DATA
With CONSULT
1. Select “WRITING DATA FOR REPLC CPU” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.
2. Follow the instruction of CONSULT display.
NOTE:
The data saved by “SAVING DATA FOR REPLC CPU” is written to ECM.

>> GO TO 10.
9.PERFORM VIN REGISTRATION
Refer to EC-20, "VIN REGISTRATION : Special Repair Requirement".

>> GO TO 10.
10.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
Perform Accelerator Pedal Released Position Learning. Refer to EC-20, "ACCELERATOR PEDAL
RELEASED POSITION LEARNING : Special Repair Requirement".

>> GO TO 11.
11.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform Throttle Valve Closed Position Learning. Refer to EC-21, "THROTTLE VALVE CLOSED POSITION
LEARNING : Special Repair Requirement".

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>> GO TO 12.
12.PERFORM IDLE AIR VOLUME LEARNING A

Perform Idle Air Volume Learning. Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Require-
ment".
EC

>> GO TO 13.
13.PERFORM EXHAUST VALVE TIMING CONTROL LEARNING C
Perform exhaust valve timing control learning. Refer to EC-23, "EXHAUST VALVE TIMING CONTROL
LEARNING : Special Repair Requirement".
D
>> END
IDLE SPEED
E
IDLE SPEED : Description INFOID:0000000010094775

This describes how to check the idle speed. For the actual procedure, follow the instructions in “BASIC F
INSPECTION”.
IDLE SPEED : Special Repair Requirement

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INFOID:0000000010094776

G
1.CHECK IDLE SPEED
With CONSULT
H
Check idle speed in “DATA MONITOR” mode with CONSULT.
With GST
Check idle speed with Service $01 of GST.
I
>> INSPECTION END
IGNITION TIMING J
IGNITION TIMING : Description INFOID:0000000010094777

This describes how to check the ignition timing. For the actual procedure, follow the instructions in “BASIC K
INSPECTION”.
IGNITION TIMING : Special Repair Requirement INFOID:0000000010094778
L
1.CHECK IGNITION TIMING
1. Attach timing light to loop wires as shown.
M
A : Timing light
: Vehicle front
N

JMBIA1128ZZ
P

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2. Check ignition timing.

>> INSPECTION END

JMBIA1135GB

VIN REGISTRATION
VIN REGISTRATION : Description INFOID:0000000010094779

VIN Registration is an operation to register VIN in ECM. It must be performed each time ECM is replaced.
NOTE:
Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).
VIN REGISTRATION : Special Repair Requirement INFOID:0000000010094780

1.CHECK VIN

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Check the VIN of the vehicle and note it. Refer to GI-23, "Identification Number".

>> GO TO 2.
2.PERFORM VIN REGISTRATION
With CONSULT
1. Turn ignition switch ON and engine stopped.
2. Select “VIN REGISTRATION” in “WORK SUPPORT” mode.
3. Follow the instruction of CONSULT display.

>> END
ACCELERATOR PEDAL RELEASED POSITION LEARNING
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Description INFOID:0000000010094781

Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accel-
erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
the harness connector of the accelerator pedal position sensor or ECM is disconnected.
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Re-
quirement INFOID:0000000010094782

1.START
1. Check that accelerator pedal is fully released.
2. Turn ignition switch ON and wait at least 2 seconds.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and wait at least 2 seconds.
5. Turn ignition switch OFF and wait at least 10 seconds.

>> END
THROTTLE VALVE CLOSED POSITION LEARNING

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THROTTLE VALVE CLOSED POSITION LEARNING : Description INFOID:0000000010094783

A
Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by
monitoring the throttle position sensor output signal. It must be performed each time harness connector of
electric throttle control actuator or ECM is disconnected or electric throttle control actuator is cleaned. EC
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement
INFOID:0000000010094784

C
1.START
WITH CONSULT
1. Turn ignition switch ON. D
2. Select “CLSD THL POS LEARN” in “WORK SUPPORT” mode.
3. Follow the instructions on the CONSULT display.
4. Turn ignition switch OFF and wait at least 10 seconds. E
Check that throttle valve moves during the above 10 seconds by confirming the operating sound.
WITHOUT CONSULT
1. Start the engine.
NOTE: F
Engine coolant temperature is 25°C (77°F) or less before engine starts.
2. Warm up the engine.

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NOTE: G
Raise engine coolant temperature until it reaches 65°C (149°F) or more.
3. Turn ignition switch OFF and wait at least 10 seconds.
Check that throttle valve moves during the above 10 seconds by confirming the operating sound.
H

>> END
IDLE AIR VOLUME LEARNING I
IDLE AIR VOLUME LEARNING : Description INFOID:0000000010094785

Idle Air Volume Learning is a function of ECM to learn the idle air volume that keeps engine idle speed within J
the specific range. It must be performed under the following conditions:
• Each time electric throttle control actuator or ECM is replaced.
• Idle speed or ignition timing is out of specification. K
IDLE AIR VOLUME LEARNING : Special Repair Requirement INFOID:0000000010094786

1.PRECONDITIONING L
Before performing Idle Air Volume Learning, check that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.
• Battery voltage: More than 12.9 V (At idle) M
• Engine coolant temperature: 70 - 100°C (158 - 212°F)
• Selector lever: P or N
• Electric load switch: OFF N
(Air conditioner, head lamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
started the head lamp will not illuminate.
• Steering wheel: Neutral (Straight-ahead position) O
• Vehicle speed: Stopped
• Transmission: Warmed-up
- With CONSULT: Drive vehicle until “ATF TEMP SEN” in “DATA MONITOR” mode of “CVT” system indicates P
less than 0.9 V.
- Without CONSULT: Drive vehicle for 10 minutes.
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM IDLE AIR VOLUME LEARNING
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 INSPECTION AND ADJUSTMENT
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With CONSULT
1. Perform EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".
2. Perform EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
3. Start engine and warm it up to normal operating temperature.
4. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
5. Touch “START” and wait 20 seconds.
Is “CMPLT” displayed on CONSULT screen?
YES >> GO TO 4.
NO >> GO TO 5.
3.PERFORM IDLE AIR VOLUME LEARNING
Without CONSULT
NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has
a malfunction.
1. Perform EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".
2. Perform EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
3. Start engine and warm it up to normal operating temperature.

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4. Turn ignition switch OFF and wait at least 10 seconds.
5. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
6. Repeat the following procedure quickly five times within 5 seconds.
- Fully depress the accelerator pedal.
- Fully release the accelerator pedal.
7. Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MIL stops blinking
and turns ON.
8. Fully release the accelerator pedal within 3 seconds after the MIL turns ON.
9. Start engine and let it idle.
10. Wait 20 seconds.

SEC897C

>> GO TO 4.
4.CHECK IDLE SPEED AND IGNITION TIMING
Rev up the engine two or three times and check that idle speed and ignition timing are within the specifica-
tions.
For procedure, refer to EC-19, "IDLE SPEED : Special Repair Requirement" and EC-19, "IGNITION TIMING :
Special Repair Requirement".
For specifications, refer to EC-596, "Idle Speed" and EC-596, "Ignition Timing".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART-I
Check the following
• Check that throttle valve is fully closed.
• Check PCV valve operation.
• Check that downstream of throttle valve is free from air leakage.

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 INSPECTION AND ADJUSTMENT
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Is the inspection result normal?
YES >> GO TO 6. A
NO >> Repair or replace malfunctioning part.
6.DETECT MALFUNCTIONING PART-II
EC
When the above three items check out OK, engine component parts and their installation condition are ques-
tionable. Check and eliminate the cause of the incident.
It is useful to perform “TROUBLE DIAGNOSIS - SPECIFICATION VALUE”. Refer to EC-149, "Description".
If any of the following conditions occur after the engine has started, eliminate the cause of the incident and C
perform Idle Air Volume Learning again:
• Engine stalls.
• Incorrect idle. D

>> INSPECTION END

EXHAUST VALVE TIMING CONTROL LEARNING E

EXHAUST VALVE TIMING CONTROL LEARNING : Description INFOID:0000000010094787

F
Exhaust Valve Timing Control Learning is a function of ECM to learn the characteristic of exhaust valve timing
control magnet retarder by comparing the target angle of exhaust camshaft with the actual retarded angle of
exhaust camshaft. It must be performed each time exhaust valve timing control magnet retarder is discon-

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nected or replaced, or ECM is replaced. G

EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement

INFOID:0000000010094788
H
1.START
With CONSULT I
1. Start engine and warm it up to normal operating temperature.
2. Set selector lever position to N and confirm that the following electrical or mechanical loads are not
applied.
- Headlamp switch is OFF J
- Air conditioner switch is OFF
- Rear window defogger switch is OFF
- Steering wheel is in the straight-ahead position, etc. K
3. Keep the engine speed between 1,800 and 2,000 rpm.
4. Select “EXH V/T CONTROL LEARN” in “WORK SUPPORT” mode with CONSULT.
5. Touch “START” and wait 20 seconds.
6. Check that “CMPLT” is displayed on CONSULT screen. L

Learning completed : CMPLT

Learning not yet : YET M

Without CONSULT
1. Start engine and warm it up to normal operating temperature.
N
2. Set selector lever position to N and confirm that the following electrical or mechanical loads are not
applied.
- Headlamp switch is OFF
- Air conditioner switch is OFF O
- Rear window defogger switch is OFF
- Steering wheel is in the straight-ahead position, etc.
3. Keep the engine speed between 1,800 and 2,000 rpm at 20 seconds.
P

>> END
MIXTURE RATIO SELF-LEARNING VALUE CLEAR

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< BASIC INSPECTION > [VQ35DE]
MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Description INFOID:0000000010094789

This describes show to erase the mixture ratio self-learning value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.
MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement
INFOID:0000000010094790

1.START
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.
3. Clear mixture ratio self-learning value by touching “CLEAR”.
With GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Select Service $03 with GST. Check that DTC P0102 is detected.
7. Select Service $04 with GST to erase the DTC P0102.

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>> END

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 HOW TO SET SRT CODE
< BASIC INSPECTION > [VQ35DE]
HOW TO SET SRT CODE
A
Description INFOID:0000000010094791

OUTLINE EC
In order to set all SRTs, the self-diagnoses as in the “SRT ITEM” table must have been performed at least
once. Each diagnosis may require actual driving for a long period of time under various conditions.
SRT ITEM C
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.

SRT item*1 Performance Corresponding D

*2 Required self-diagnostic items to set the SRT to “CMPLT”
(CONSULT indication) Priority DTC No.
CATALYST 2 Three way catalyst function P0420, P0430
EVAP SYSTEM 2 EVAP control system purge flow monitoring P0441
E

1 EVAP control system P0442

2 EVAP control system P0456
F
HO2S 2 Air fuel ratio (A/F) sensor 1 P014C,
P014D,P014E,

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P014F,P015A,
P015B,P015C, G
P015D
Heated oxygen sensor 2 P0137, P0157
Heated oxygen sensor 2 P0138, P0158
H

Heated oxygen sensor 2 P0139, P0159

EGR/VVT SYSTEM 3 Intake value timing control function P0011, P0014,
I
P0021, P0024
*1: Though displayed on the CONSULT screen, “HO2S HTR” is not SRT item.
*2: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by J
one based on the priority for models with CONSULT.
SRT SERVICE PROCEDURE
K

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 HOW TO SET SRT CODE
< BASIC INSPECTION > [VQ35DE]
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence, referring to the following flowchart.

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JSBIA0400GB

SRT Set Driving Pattern INFOID:0000000010094792

CAUTION:

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 HOW TO SET SRT CODE
< BASIC INSPECTION > [VQ35DE]
Always drive the vehicle in safe manner according to traffic conditions and obey all traffic laws.
A

EC

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G

JPBIA5560GB

*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal P
and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h
(56 MPH) again.
*2: Checking the vehicle speed with GST is advised.
• The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driving
habits, etc.
• “Zone A” is the fastest time where required for the diagnosis under normal conditions*. If the diagnosis is not
completed within “Zone A”, the diagnosis can still be performed within “Zone B”.

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 HOW TO SET SRT CODE
< BASIC INSPECTION > [VQ35DE]
*: Normal conditions
- Sea level
- Flat road
- Ambient air temperature: 20 – 30°C (68 – 86°F)
NOTE:
Diagnosis is performed as quickly as possible under normal conditions. However, under other conditions,
diagnosis may also be performed. [For example: ambient air temperature other than 20 – 30°C (68 – 86°F)]
Work Procedure INFOID:0000000010094793

1.CHECK DTC
Check DTC.
Is any DTC detected?
YES >> Repair malfunction(s) and erase DTC. Refer to EC-542, "DTC Index".
NO >> GO TO 2.
2.CHECK SRT STATUS
With CONSULT
Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.
Without CONSULT
Perform “SRT status” mode with EC-135, "On Board Diagnosis Function".

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With GST
Select Service $01 with GST.
Is SRT code(s) set?
YES >> GO TO 11.
NO-1 >> With CONSULT: GO TO 3.
NO-2 >> Without CONSULT: GO TO 4.
3.DTC CONFIRMATION PROCEDURE
1. Select “SRT WORK SUPPORT” in “DTC & SRT CONFIRMATION” mode with CONSULT.
2. For SRT(s) that is not set, perform the corresponding “DTC CONFIRMATION PROCEDURE” according to
the “Performance Priority” in the “SRT ITEM” table. Refer to EC-25, "Description".
3. Check DTC.
Is any DTC detected?
YES >> Repair malfunction(s) and erase DTC. Refer to EC-542, "DTC Index".
NO >> GO TO 10.
4.PERFORM ROAD TEST
• Check the “Performance Priority” in the “SRT ITEM” table. Refer to EC-25, "Description".
• Perform the most efficient SRT set driving pattern to set the SRT properly. Refer to EC-26, "SRT Set Driving
Pattern".
In order to set all SRTs, the SRT set driving pattern must be performed at least once.

>> GO TO 5.
5.PATTERN 1
1. Check the vehicle condition;
- Engine coolant temperature is −10 to 35°C (14 to 95°F).
- Fuel tank temperature is more than 0°C (32°F).
2. Start the engine.
3. Keep engine idling until the engine coolant temperature is greater than 70°C (158°F)
NOTE:
ECM terminal voltage is follows;
• Engine coolant temperature
- −10 to 35°C (14 to 95°F): 3.0 – 4.3 V
- 70°(158°F): Less than 4.1 V
• Fuel tank temperature: Less than 1.4 V
Refer to EC-522, "Reference Value".

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 HOW TO SET SRT CODE
< BASIC INSPECTION > [VQ35DE]

>> GO TO 6. A
6.PATTERN 2
1. Drive the vehicle. And depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then EC
release the accelerator pedal and keep it released for more than 10 seconds.
2. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again
NOTE:
• Checking the vehicle speed with GST is advised. C
• When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted.
In this case, the time required for diagnosis may be extended.
D
>> GO TO 7.
7.PATTERN 3 E
• Operate vehicle following the driving pattern shown in the figure.
• Release the accelerator pedal during deceleration of vehicle speed
from 90 km/h (56 MPH) to 0 km/h (0 MPH).
F

>> GO TO 8.

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G

H
PBIB2244E

8.PATTERN 4
I
• Operate vehicle, following the driving pattern shown in the figure.
- Drive the vehicle in a proper gear at 60 km/h (38 MPH) and main-
tain the speed.
- Release the accelerator pedal fully at least 5 seconds. J
- Repeat the above two steps at least 5 times.

>> GO TO 9. K

L
JSBIA0160GB

9.PATTERN 5
• The accelerator pedal must be held very steady during steady-state driving. M
• If the accelerator pedal is moved, the test must be conducted again.

N
>> GO TO 10.
10.CHECK SRT STATUS O
With CONSULT
Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.
Without CONSULT P
Perform “SRT status” mode with EC-135, "On Board Diagnosis Function".
With GST
Select Service $01 with GST.
Is SRT(s) set?
YES >> GO TO 11.
NO >> Call TECH LINE or take appropriate action.

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 HOW TO SET SRT CODE
< BASIC INSPECTION > [VQ35DE]

11.CHECK PERMANENT DTC

NOTE:
Permanent DTC cannot be checked with a tool other than CONSULT or GST.
With CONSULT
Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.
With GST
Select Service $0A with GST.
Is permanent DTC(s) detected?
YES >> Go to EC-31, "Description".
NO >> END

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Revision: August 2013 EC-30 2014 Maxima NAM

 HOW TO ERASE PERMANENT DTC
< BASIC INSPECTION > [VQ35DE]
HOW TO ERASE PERMANENT DTC
A
Description INFOID:0000000010094794

OUTLINE EC
When a DTC is stored in ECM
When a DTC is stored in ECM and MIL is ON, a permanent DTC is erased with MIL shutoff if the same mal-
function is not detected after performing the driving pattern for MIL shutoff three times in a raw. C

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G

JSBIA0063GB

I
*1: When the same malfunction is de- *2: MIL will turn off after vehicle is driven
tected in two consecutive trips, MIL 3 times (driving pattern B) without
will illuminate. any malfunctions.
J
When a DTC is not stored in ECM
The erasing method depends on a permanent DTC stored in ECM. Refer to the following table.
NOTE:
If the applicable permanent DTC includes multiple groups, perform the procedure of Group B first. If the per- K
manent DTC is not erased, perform the procedure of Group A.
×: Applicable —: Not applicable
L
Perform “DTC CONFIRMATION PROCEDURE” Driving pattern
Group* for applicable DTCs.
Reference
B D
EC-32, "Work Proce- M
A × — —
dure (Group A)"
EC-34, "Work Proce-
B — × ×
dure (Group B)"
N
*: For group, refer to EC-542, "DTC Index".
PERMANENT DTC ITEM
For permanent DTC items, MIL turns ON. Refer to EC-542, "DTC Index". O

Revision: August 2013 EC-31 2014 Maxima NAM

 HOW TO ERASE PERMANENT DTC
< BASIC INSPECTION > [VQ35DE]
PERMANENT DTC SERVICE PROCEDURE

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JSBIA0401GB

Work Procedure (Group A) INFOID:0000000010094795

JSBIA0064GB

Revision: August 2013 EC-32 2014 Maxima NAM

 HOW TO ERASE PERMANENT DTC
< BASIC INSPECTION > [VQ35DE]

*1: When the same malfunction is de- A

tected in two consecutive trips, MIL
will illuminate.

1.CHECK DTC EC

Check DTC.
Is any DTC detected?
C
YES >> Repair malfunction(s) and erase DTC. EC-135, "On Board Diagnosis Function" or EC-138, "CON-
SULT Function".
NO >> GO TO 2.
D
2.CHECK PERMANENT DTC
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds. E
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
F
5. Select “PERMANENT DTC STATUS” mode with CONSULT.
With GST
1. Turn ignition switch OFF and wait at least 10 seconds.

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2. Turn ignition switch ON. G
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select Service $0A with GST. H
Is any permanent DTC detected?
YES >> GO TO 3.
NO >> END I
3.PERFORM DTC CONFIRMATION PROCEDURE
Perform “DTC CONFIRMATION PROCEDURE” for DTCs which are the same as permanent DTCs stored in
J
ECM. Refer to EC-542, "DTC Index".

>> GO TO 4.
K
4.CHECK PERMANENT DTC
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds. L
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON. M
5. Select “PERMANENT DTC STATUS” mode with CONSULT.
With GST
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. N
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select Service $0A with GST. O
Is any permanent DTC detected?
YES >> GO TO 1.
NO >> END P

Revision: August 2013 EC-33 2014 Maxima NAM

 HOW TO ERASE PERMANENT DTC
< BASIC INSPECTION > [VQ35DE]
Work Procedure (Group B) INFOID:0000000010094796

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JSBIA0414GB

*1: When the same malfunction is de- *2: After experiencing driving pattern B *3: Indication does not change unless
tected in two consecutive trips, MIL and D, permanent DTC is erased. the ignition switch is turned from ON
will illuminate. to OFF twice even after experiencing
driving pattern B or D.

NOTE:
Drive the vehicle according to only driving patterns indicating “INCMP” in driving patterns B and D on the
“PERMANENT DTC STATUS” screen.
1.CHECK DTC
Check DTC.
Is any DTC detected?
YES >> Repair malfunction(s) and erase DTC. Refer to EC-135, "On Board Diagnosis Function" or EC-
138, "CONSULT Function".
NO >> GO TO 2.
2.CHECK PERMANENT DTC
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select “PERMANENT DTC STATUS” mode with CONSULT.
With GST
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

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 HOW TO ERASE PERMANENT DTC
< BASIC INSPECTION > [VQ35DE]
4. Turn ignition switch ON.
5. Select Service $0A with GST. A
Is any permanent DTC detected?
YES >> GO TO 3.
NO >> END EC
3.DRIVE DRIVING PATTERN B
CAUTION:
C
• Always drive at a safe speed.
• Never erase self-diagnosis results.
• If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving
pattern B and D is reset. D
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Use “PERMANENT DTC WORK SUPPORT” mode with CONSULT to drive the vehicle according to driv- E
ing pattern B. Refer to EC-138, "CONSULT Function", EC-132, "DIAGNOSIS DESCRIPTION : Driving
Pattern".
With GST
1. Start engine and warm it up to normal operating temperature. F
2. Drive the vehicle according to driving pattern B. Refer to EC-132, "DIAGNOSIS DESCRIPTION : Driving
Pattern".

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G
>> GO TO 4.
4.CHECK PERMANENT DTC H
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. I
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select “PERMANENT DTC STATUS” mode with CONSULT.
With GST J
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. K
4. Turn ignition switch ON.
5. Select Service $0A with GST.
Is any permanent DTC detected? L
YES >> GO TO 5.
NO >> END
5.DRIVE DRIVING PATTERN D M
CAUTION:
• Always drive at a safe speed.
• Never erase self-diagnosis results. N
• If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving
pattern B and D is reset.
1. Drive the vehicle according to driving pattern D. Refer to EC-132, "DIAGNOSIS DESCRIPTION : Driving O
Pattern".

>> GO TO 6. P
6.CHECK PERMANENT DTC
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.

Revision: August 2013 EC-35 2014 Maxima NAM

 HOW TO ERASE PERMANENT DTC
< BASIC INSPECTION > [VQ35DE]
5. Select “PERMANENT DTC STATUS” mode with CONSULT.
With GST
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select Service $0A with GST.
Is any permanent DTC detected?
YES >> GO TO 1.
NO >> END

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Revision: August 2013 EC-36 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

SYSTEM DESCRIPTION A
ENGINE CONTROL SYSTEM
System Diagram INFOID:0000000010094797
EC

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G

JMBIA1840GB

Revision: August 2013 EC-37 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
System Description INFOID:0000000010094798

ECM performs various controls such as fuel injection control and ignition timing control.
Component Parts Location INFOID:0000000010094799

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ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)

Revision: August 2013 EC-38 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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G

L
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor M
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
N
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1) O
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2) P
moved)
: Vehicle front

Revision: August 2013 EC-39 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

JMBIA1832GB

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ALBIA0605ZZ

1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS)
: Vehicle front

Revision: August 2013 EC-40 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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G

L
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve M
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
N
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2) O
: Vehicle front

Revision: August 2013 EC-41 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

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ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor
with front grille removed)
: Vehicle front

Revision: August 2013 EC-42 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

E
AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

F
Component Description INFOID:0000000010094800

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G
Component Reference
A/F sensor 1 EC-218, "Description"
H
A/F sensor 1 heater EC-170, "Description"
Accelerator pedal position sensor EC-467, "Description"
ASCD brake switch EC-429, "Description" I
ASCD steering switch EC-426, "Description"
Battery current sensor EC-414, "Description"
Camshaft position sensor (PHASE) EC-300, "Description" J
Crankshaft position sensor (POS) EC-296, "Description"
Cooling fan motor EC-486, "Description"
K
Electric throttle control actuator EC-465, "Description"
Electronic controlled engine mount EC-493, "Description"
Engine coolant temperature sensor EC-201, "Description" L
Engine oil temperature sensor EC-277, "Description"
EVAP canister purge volume control solenoid valve EC-323, "Description"
M
EVAP canister vent control valve EC-333, "Description"
EVAP control system pressure sensor EC-343, "Description"
Fuel injector EC-496, "Description" N
Fuel level sensor EC-372, "Description"
Fuel pump EC-499, "Description"
O
Fuel tank temperature sensor EC-269, "Description"
Heated oxygen sensor 2 EC-230, "Description"
Heated oxygen sensor 2 heater EC-173, "Description" P
Ignition coil with power transistor EC-502, "Description"
Intake air temperature sensor EC-198, "Description"
Intake valve timing control solenoid valve EC-177, "Description"
Knock sensor EC-293, "Description"
Mass air flow sensor EC-183, "Description"

Revision: August 2013 EC-43 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
Component Reference
PCV valve EC-514, "Description"
Power steering pressure sensor EC-386, "Description"
Power valves 1 and 2 EC-518, "Description"
Refrigerant pressure sensor EC-515, "Description"
Stop lamp switch EC-448, "Description"
TCM EC-397, "Description"
Throttle control motor EC-462, "Description"
Throttle control motor relay EC-456, "Description"
Throttle position sensor EC-207, "Description"
VIAS control solenoid valve 1 EC-442, "Description"
VIAS control solenoid valve 2 EC-445, "Description"

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Revision: August 2013 EC-44 2014 Maxima NAM

 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
MULTIPORT FUEL INJECTION SYSTEM
A
System Diagram INFOID:0000000010094801

EC

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G

JMBIA1534GB
I

System Description INFOID:0000000010094802

J
INPUT/OUTPUT SIGNAL CHART

Sensor Input Signal to ECM ECM function Actuator

K
Crankshaft position sensor (POS) Engine speed*3
Camshaft position sensor (PHASE) Piston position
Mass air flow sensor Amount of intake air L
Intake air temperature sensor Intake air temperature
Engine coolant temperature sensor Engine coolant temperature
M
Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position Fuel injection N
TCM Gear position & mixture ratio Fuel injector
control
Battery Battery voltage*3
O
Knock sensor Engine knocking condition
Power steering pressure sensor Power steering operation

Heated oxygen sensor 2*1 Density of oxygen in exhaust gas P

ABS actuator and electric unit (control unit) VDC/TCS operation command*2

Air conditioner operation*2

Unified meter and A/C amp.
Vehicle speed*2
*1: This sensor is not used to control the engine system under normal conditions.
*2: This signal is sent to the ECM via the CAN communication line.

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 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.

SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from the crankshaft position sensor (POS), camshaft position
sensor (PHASE) and the mass air flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.
<Fuel increase>
• During warm-up
• When starting the engine
• During acceleration
• Hot-engine operation
• When selector lever is changed from N to D
• High-load, high-speed operation
<Fuel decrease>
• During deceleration

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• During high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)

PBIB3020E

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can better reduce CO, HC and NOx emissions. This system uses A/F sen-
sor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM adjusts the
injection pulse width according to the sensor voltage signal. For more information about A/F sensor 1, refer to
EC-218, "Description". This maintains the mixture ratio within the range of stoichiometric (ideal air-fuel mix-
ture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of A/F sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated
oxygen sensor 2.
• Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
- Deceleration and acceleration
- High-load, high-speed operation
- Malfunction of A/F sensor 1 or its circuit
- Insufficient activation of A/F sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- After shifting from N to D
- When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally

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 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., fuel injector clogging) directly affect mixture ratio. A
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
EC
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short-term fuel trim and long-term fuel trim.
“Short-term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the- C
oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in
fuel volume if it is lean.
“Long-term fuel trim” is overall fuel compensation carried out over time to compensate for continual deviation D
of the short-term fuel trim from the central value. Continual deviation will occur due to individual engine differ-
ences, wear over time and changes in the usage environment.
FUEL INJECTION TIMING E

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SEF179U
H
Two types of systems are used.
• Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running. I
• Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all six cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM. J
The six injectors will then receive the signals 2 times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF K
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.
L

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 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094803

cardiagn.com
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)

Revision: August 2013 EC-48 2014 Maxima NAM

 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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G

L
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor M
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
N
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1) O
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2) P
moved)
: Vehicle front

Revision: August 2013 EC-49 2014 Maxima NAM

 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

JMBIA1832GB

cardiagn.com
ALBIA0605ZZ

1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS)
: Vehicle front

Revision: August 2013 EC-50 2014 Maxima NAM

 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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G

L
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve M
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
N
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2) O
: Vehicle front

Revision: August 2013 EC-51 2014 Maxima NAM

 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor
with front grille removed)
: Vehicle front

Revision: August 2013 EC-52 2014 Maxima NAM

 MULTIPORT FUEL INJECTION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

E
AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

F
Component Description INFOID:0000000010094804

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G
Component Reference
A/F sensor 1 EC-218, "Description"
H
Accelerator pedal position sensor EC-467, "Description"
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description" I
Engine coolant temperature sensor EC-201, "Description"
Fuel injector EC-496, "Description"
Heated oxygen sensor 2 EC-230, "Description" J
Intake air temperature sensor EC-198, "Description"
Knock sensor EC-293, "Description"
K
Mass air flow sensor EC-183, "Description"
TCM EC-397, "Description"
Power steering pressure sensor EC-386, "Description" L
Throttle position sensor EC-207, "Description"

Revision: August 2013 EC-53 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
ELECTRIC IGNITION SYSTEM
System Diagram INFOID:0000000010094805

JMBIA1527GB

cardiagn.com
System Description INFOID:0000000010094806

INPUT/OUTPUT SIGNAL CHART

Sensor Input Signal to ECM ECM function Actuator

Crankshaft position sensor (POS) Engine speed*2
Camshaft position sensor (PHASE) Piston position
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Ignition timing Ignition coil
Accelerator pedal position sensor Accelerator pedal position control (with power transistor)
Battery Battery voltage*2
Knock sensor Engine knocking
TCM Gear position
Unified meter and A/C amp. Vehicle speed*1
*1: This signal is sent to the ECM via the CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.

SYSTEM DESCRIPTION
Ignition order: 1 - 2 - 3 - 4 - 5 - 6
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
• At idle
• At low battery voltage
• During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not

Revision: August 2013 EC-54 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition. A
Component Parts Location INFOID:0000000010094807

EC

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G

ALBIA0603ZZ

K
1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2) L
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch M
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air N
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
O
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor P
retarder (bank 1)

Revision: August 2013 EC-55 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1)
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2)
moved)
: Vehicle front

Revision: August 2013 EC-56 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

JMBIA1832GB F

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ALBIA0605ZZ
O
1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS) P
: Vehicle front

Revision: August 2013 EC-57 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2)
: Vehicle front

Revision: August 2013 EC-58 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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G

L
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch M
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor N
with front grille removed)
: Vehicle front

Revision: August 2013 EC-59 2014 Maxima NAM

 ELECTRIC IGNITION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

Component Description INFOID:0000000010094808

cardiagn.com
Component Reference
Accelerator pedal position sensor EC-467, "Description"
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description"
Engine coolant temperature sensor EC-201, "Description"
Ignition signal EC-502, "Description"
Knock sensor EC-293, "Description"
Mass air flow sensor EC-183, "Description"
TCM EC-397, "Description"
Throttle position sensor EC-207, "Description"

Revision: August 2013 EC-60 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
AIR CONDITIONING CUT CONTROL
A
System Diagram INFOID:0000000010094809

EC

JMBIA1528GB

cardiagn.com
G
System Description INFOID:0000000010094810

INPUT/OUTPUT SIGNAL CHART H

Sensor Input Signal to ECM ECM function Actuator

Accelerator pedal position sensor Accelerator pedal position I
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed*2

Engine coolant temperature sensor Engine coolant temperature

J
IPDM E/R
↓
Battery Battery voltage*2 Air conditioner
Air conditioner relay
cut control
Refrigerant pressure sensor Refrigerant pressure ↓ K
Compressor
Power steering pressure sensor Power steering operation

Air conditioner ON signal*1

Unified meter and A/C amp. L
Vehicle speed*1
*1: This signal is sent to the ECM via the CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage. M
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF. N
• When the accelerator pedal is fully depressed.
• When cranking the engine.
• At high engine speeds. O
• When the engine coolant temperature becomes excessively high.
• When operating power steering during low engine speed or low vehicle speed.
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high. P

Revision: August 2013 EC-61 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094811

cardiagn.com
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)

Revision: August 2013 EC-62 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor M
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
N
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1) O
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2) P
moved)
: Vehicle front

Revision: August 2013 EC-63 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

JMBIA1832GB

cardiagn.com
ALBIA0605ZZ

1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS)
: Vehicle front

Revision: August 2013 EC-64 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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G

L
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve M
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
N
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2) O
: Vehicle front

Revision: August 2013 EC-65 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor
with front grille removed)
: Vehicle front

Revision: August 2013 EC-66 2014 Maxima NAM

 AIR CONDITIONING CUT CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

E
AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

F
Component Description INFOID:0000000010094812

cardiagn.com
G
Component Reference
Accelerator pedal position sensor EC-467, "Description"
H
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description"
Engine coolant temperature sensor EC-201, "Description" I
Power steering pressure sensor EC-386, "Description"
Refrigerant pressure sensor EC-515, "Description"
J

Revision: August 2013 EC-67 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Diagram INFOID:0000000010094813

JMBIA1616GB

System Description

cardiagn.com
INFOID:0000000010094814

INPUT/OUTPUT SIGNAL CHART

Sensor Input signal to ECM ECM function Actuator

ASCD brake switch Brake pedal operation
Stop lamp switch Brake pedal operation
ASCD steering switch ASCD steering switch operation ASCD vehicle speed Electric throttle control
Gear position control actuator
TCM
Powertrain revolution*
Unified meter and A/C amp. Vehicle speed*
*: This signal is sent to the ECM via the CAN communication line

BASIC ASCD SYSTEM

Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE lamp in combination meter. If any malfunction occurs in the
ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE lamp in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch.
ACCELERATE OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will maintain the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches on ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
Revision: August 2013 EC-68 2014 Maxima NAM
 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]
• Selector lever position is N, P or R
• Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed A
• TCS system is operated
• CVT control system has a malfunction. Refer to EC-437, "Description".
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
EC
the driver by blinking indicator lamp.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will C
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.
If MAIN switch is turned to OFF while ASCD is activated, all of ASCD operations will be canceled and vehicle D
speed memory will be erased.
COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the E
switch is released. And then ASCD will maintain the new set speed.
RESUME OPERATION
When the RESUME/ACCELERATE switch is pressed after canceling operation other than pressing the MAIN F
switch, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must meet
following conditions.

cardiagn.com
• Brake pedal is released G
• Selector lever position is other than P and N
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)
Component Parts Location INFOID:0000000010094815 H

ALBIA0603ZZ

Revision: August 2013 EC-69 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)

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Revision: August 2013 EC-70 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor M
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
N
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1) O
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2) P
moved)
: Vehicle front

Revision: August 2013 EC-71 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]

JMBIA1832GB

cardiagn.com
ALBIA0605ZZ

1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS)
: Vehicle front

Revision: August 2013 EC-72 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve M
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
N
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2) O
: Vehicle front

Revision: August 2013 EC-73 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor
with front grille removed)
: Vehicle front

Revision: August 2013 EC-74 2014 Maxima NAM

 AUTOMATIC SPEED CONTROL DEVICE (ASCD)
< SYSTEM DESCRIPTION > [VQ35DE]

EC

E
AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

F
Component Description INFOID:0000000010094816

cardiagn.com
G
Component Reference
ASCD steering switch EC-426, "Description"
H
ASCD brake switch EC-429, "Description"
ASCD clutch switch EC-429, "Description"
Stop lamp switch EC-448, "Description" I
Electric throttle control actuator EC-465, "Description"
ASCD indicator EC-485, "Description"
J

Revision: August 2013 EC-75 2014 Maxima NAM

 CAN COMMUNICATION
< SYSTEM DESCRIPTION > [VQ35DE]
CAN COMMUNICATION
System Description INFOID:0000000010094817

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to LAN-7, "CAN Communication Control Circuit", about CAN communication for detail.

cardiagn.com

Revision: August 2013 EC-76 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
COOLING FAN CONTROL
A
System Diagram INFOID:0000000010094818

EC

JMBIA1905GB

cardiagn.com
G
System Description INFOID:0000000010094819

INPUT/OUTPUT SIGNAL CHART H

Sensor Input signal to ECM ECM function Actuator

Crankshaft position sensor (POS) I
Camshaft position sensor (PHASE) Engine speed*1

Battery Battery voltage*1 IPDM E/R

↓ J
Engine coolant temperature sensor Engine coolant temperature Cooling fan
Cooling fan relay
control
Refrigerant pressure sensor Refrigerant pressure ↓
Cooling fan motor
Air conditioner ON signal*2 K
Unified meter and A/C amp.
2
Vehicle speed*
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
L
*2: This signal is sent to ECM via the CAN communication line.

SYSTEM DESCRIPTION
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant M
pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].

Revision: August 2013 EC-77 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
Cooling Fan Operation

cardiagn.com
JMBIA0179GB

Cooling Fan Relay Operation

The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.

Cooling fan relay

Cooling fan speed
1 2 3
Stop (OFF) OFF OFF OFF
Low (LOW) ON OFF OFF
Middle (MID) OFF ON OFF
High (HI) OFF ON ON

Revision: August 2013 EC-78 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094820

EC

cardiagn.com
G

J
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2) K
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2) L
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
M
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1) N
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1 O
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)
P

Revision: August 2013 EC-79 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1)
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2)
moved)
: Vehicle front

Revision: August 2013 EC-80 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

JMBIA1832GB F

cardiagn.com
G

ALBIA0605ZZ
O
1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS) P
: Vehicle front

Revision: August 2013 EC-81 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2)
: Vehicle front

Revision: August 2013 EC-82 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch M
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor N
with front grille removed)
: Vehicle front

Revision: August 2013 EC-83 2014 Maxima NAM

 COOLING FAN CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

Component Description INFOID:0000000010094821

cardiagn.com
Component Reference
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description"
Cooling fan motor EC-486, "Description"
Engine coolant temperature sensor EC-201, "Description"
Refrigerant pressure sensor EC-515, "Description"

Revision: August 2013 EC-84 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]
ELECTRONIC CONTROLLED ENGINE MOUNT
A
System Diagram INFOID:0000000010094822

EC

D
JMBIA1906GB

System Description INFOID:0000000010094823

E

INPUT/OUTPUT SIGNAL CHART

F
Sensor Input signal to ECM ECM function Actuator

cardiagn.com
Crankshaft position sensor (POS) Electronic controlled en-
Engine speed Engine mount
Camshaft position sensor (PHASE) gine mount control solenoid G
control
Unified meter and A/C amp. Vehicle speed* valve

*: This signal is sent to the ECM via the CAN communication line.
H
SYSTEM DESCRIPTION
The ECM controls the engine mount operation corresponding to the engine speed. The control system has a
2-step control [Soft/Hard] I

Vehicle condition Engine mount control

Engine speed: Below 950 rpm Soft J
Engine speed: Above 950 rpm Hard

ELECTRONIC CONTROLLED ENGINE MOUNT LINE DRAWING

K

Revision: August 2013 EC-85 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
JMBIA0182ZZ

1. Power valve actuator 1 2. VIAS control solenoid valve 1 3. VIAS control solenoid valve 2
4. Power valve actuator 2 5. Intake manifold collector
: From next figure

Revision: August 2013 EC-86 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
JMBIA0183ZZ

1. Electronic controlled engine mount 2. Front electronic controlled engine 3. Rear electronic controlled engine M
control solenoid valve mount mount
: To previous figure
N
NOTE:
Do not use soapy water or any type of solvent while installing vacuum hose.

Revision: August 2013 EC-87 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094824

cardiagn.com
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)

Revision: August 2013 EC-88 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor M
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
N
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1) O
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2) P
moved)
: Vehicle front

Revision: August 2013 EC-89 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

JMBIA1832GB

cardiagn.com
ALBIA0605ZZ

1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS)
: Vehicle front

Revision: August 2013 EC-90 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve M
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
N
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2) O
: Vehicle front

Revision: August 2013 EC-91 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor
with front grille removed)
: Vehicle front

Revision: August 2013 EC-92 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< SYSTEM DESCRIPTION > [VQ35DE]

EC

E
AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

F
Component Description INFOID:0000000010094825

cardiagn.com
G
Component Reference
Camshaft position sensor (PHASE) EC-300, "Description"
H
Crankshaft position sensor (POS) EC-296, "Description"
Electronic controlled engine mount control solenoid valve EC-493, "Description"

Revision: August 2013 EC-93 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
EVAPORATIVE EMISSION SYSTEM
System Diagram INFOID:0000000010094826

JMBIA1530GB

cardiagn.com
System Description INFOID:0000000010094827

INPUT/OUTPUT SIGNAL CHART

Sensor Input signal to ECM ECM function Actuator

Crankshaft position sensor (POS) Engine speed*1
Camshaft position sensor (PHASE) Piston position
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Density of oxygen in exhaust gas
Air fuel ratio (A/F) sensor 1
(Mixture ratio feedback signal)
EVAP canister EVAP canister purge vol-
Throttle position sensor Throttle position purge flow control ume control solenoid valve
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*1
Fuel tank temperature sensor Fuel temperature in fuel tank
EVAP control system pressure sensor Pressure in purge line
Unified meter and A/C amp. Vehicle speed*2
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM via the CAN communication line.

SYSTEM DESCRIPTION
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air via the purge line to the intake manifold when the engine
is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine oper-
ates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally
regulated as the air flow increases.

Revision: August 2013 EC-94 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling. A

EC

F
PBIB3639E

EVAPORATIVE EMISSION LINE DRAWING

cardiagn.com
G

ALBIA0106ZZ

Revision: August 2013 EC-95 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

1. Intake manifold collector 2. EVAP canister purge volume control 3. EVAP service port
solenoid valve
A. From EVAP canister
: Vehicle front

ALBIA0639ZZ
cardiagn.com
1. EVAP canister vent control valve 2. EVAP canister system pressure sensor 3. EVAP canister
4. Rear suspension member 5. Drain filter
: Front
: Previous/next figure

NOTE:
Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.

Revision: August 2013 EC-96 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094828

EC

cardiagn.com
G

J
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2) K
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2) L
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
M
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1) N
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1 O
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)
P

Revision: August 2013 EC-97 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1)
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2)
moved)
: Vehicle front

Revision: August 2013 EC-98 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

JMBIA1832GB F

cardiagn.com
G

ALBIA0605ZZ
O
1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS) P
: Vehicle front

Revision: August 2013 EC-99 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2)
: Vehicle front

Revision: August 2013 EC-100 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch M
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor N
with front grille removed)
: Vehicle front

Revision: August 2013 EC-101 2014 Maxima NAM

 EVAPORATIVE EMISSION SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

Component Description INFOID:0000000010094829

cardiagn.com
Component Reference
A/F sensor 1 EC-218, "Description"
Accelerator pedal position sensor EC-467, "Description"
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description"
Engine coolant temperature sensor EC-201, "Description"
EVAP canister purge volume control solenoid valve EC-323, "Description"
EVAP control system pressure sensor EC-343, "Description"
Fuel tank temperature sensor EC-269, "Description"
Mass air flow sensor EC-183, "Description"
Throttle position sensor EC-207, "Description"

Revision: August 2013 EC-102 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
EXHAUST VALVE TIMING CONTROL
A
System Diagram INFOID:0000000010094830

EC

D
JMBIA1567GB

System Description INFOID:0000000010094831

E

INPUT/OUTPUT SIGNAL CHART

F
Sensor Input signal to ECM ECM function Actuator

cardiagn.com
Crankshaft position sensor
Engine speed & piston position G
Camshaft position sensor
Exhaust valve Exhaust valve timing con-
Engine oil temperature sensor Engine oil temperature
timing control trol magnet retarder
Exhaust valve timing control position sensor Exhaust valve timing signal H
Unified meter and A/C amp. Vehicle speed*
*: This signal is sent to the ECM via the CAN Communication line.
I
SYSTEM DESCRIPTION

N
PBIB2765E

This mechanism magnetically controls cam phases continuously with the fixed operating angle of the exhaust
valve. O
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine oil tem-
perature. Then, the ECM sends ON/OFF pulse duty signals to the exhaust valve timing control magnet
retarder depending on driving status. This makes it possible to control the shut/open timing of the exhaust P
valve to increase engine torque and output in a range of high engine speed.

Revision: August 2013 EC-103 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094832

cardiagn.com
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2)
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2)
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1)
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)

Revision: August 2013 EC-104 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor M
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
N
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1) O
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2) P
moved)
: Vehicle front

Revision: August 2013 EC-105 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

JMBIA1832GB

cardiagn.com
ALBIA0605ZZ

1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS)
: Vehicle front

Revision: August 2013 EC-106 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

cardiagn.com
G

L
ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve M
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
N
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2) O
: Vehicle front

Revision: August 2013 EC-107 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

cardiagn.com
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor
with front grille removed)
: Vehicle front

Revision: August 2013 EC-108 2014 Maxima NAM

 EXHAUST VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

E
AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

F
Component Description INFOID:0000000010094833

cardiagn.com
G
Component Reference
Camshaft position sensor EC-300, "Description"
H
Crankshaft position sensor EC-296, "Description"
Engine oil temperature sensor EC-277, "Description"
Exhaust valve timing control magnet retarder EC-180, "Description" I
Exhaust valve timing control position sensor EC-400, "Description"

Revision: August 2013 EC-109 2014 Maxima NAM

 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
INTAKE VALVE TIMING CONTROL
System Diagram INFOID:0000000010094834

JMBIA1532GB

System Description INFOID:0000000010094835

INPUT/OUTPUT SIGNAL CHART

Sensor Input signal to ECM ECM function Actuator

cardiagn.com
Crankshaft position sensor (POS)
Engine speed and piston position
Camshaft position sensor (PHASE)
Intake valve Intake valve timing control
Engine oil temperature sensor Engine oil temperature
timing control solenoid valve
Engine coolant temperature sensor Engine coolant temperature
Unified meter and A/C amp. Vehicle speed*
*: This signal is sent to the ECM via the CAN communication line

SYSTEM DESCRIPTION

JMBIA0060GB

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control sole-
noid valve depending on driving status. This makes it possible to control the shut/open timing of the intake
valve to increase engine torque in low/mid speed range and output in high-speed range.

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 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094836

EC

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G

J
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2) K
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2) L
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
M
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1) N
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1 O
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)
P

Revision: August 2013 EC-111 2014 Maxima NAM

 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

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ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1)
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2)
moved)
: Vehicle front

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 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

JMBIA1832GB F

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ALBIA0605ZZ
O
1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS) P
: Vehicle front

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 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

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ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2)
: Vehicle front

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 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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L
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch M
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor N
with front grille removed)
: Vehicle front

Revision: August 2013 EC-115 2014 Maxima NAM

 INTAKE VALVE TIMING CONTROL
< SYSTEM DESCRIPTION > [VQ35DE]

AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

Component Description INFOID:0000000010094837

cardiagn.com
Component Reference
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description"
Engine coolant temperature sensor EC-201, "Description"
Intake valve timing control solenoid valve EC-177, "Description"

Revision: August 2013 EC-116 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
VARIABLE INDUCTION AIR SYSTEM
A
System Diagram INFOID:0000000010094838

EC

JMBIA1831GB

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System Description INFOID:0000000010094839

INPUT/OUTPUT SIGNAL CHART H

Sensor Input signal to ECM ECM function Actuator

Crankshaft position sensor (POS) I
Engine speed*
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature VIAS control solenoid valve 1 J
VIAS control
VIAS control solenoid valve 2
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position K
Battery Battery voltage*
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
L
SYSTEM DESCRIPTION

JMBIA0181GB

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 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
In the medium speed range, the power valves are closed. Under this condition, the pressure waves of the
exhaust stroke do not disturb the pressure waves of the intake stroke of each opposite bank. Therefore, charg-
ing efficiency is increased together with the effect of the long intake passage.
However, in the high speed range, the power valves are open. Under this condition, the pressure waves of
intake stroke are resonant with those of each opposite bank exhaust stroke. Therefore, charging efficiency is
also increased.
In addition, both valves 1 and 2 are opened or closed in other ranges mentioned above. Thus maximum
charging efficiency is obtained for the various driving conditions.
VACUUM HOSE DRAWING

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JMBIA0172ZZ

1. Power valve actuator 1 2. VIAS control solenoid valve 1 3. VIAS control solenoid valve 2
4. Power valve actuator 2 5. Intake manifold collector

Revision: August 2013 EC-118 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
Component Parts Location INFOID:0000000010094840

EC

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J
ALBIA0603ZZ

1. Intake valve timing control solenoid 2. Electronic controlled engine mount 3. Exhaust valve timing control magnet
valve (bank 1) control solenoid valve retarder (bank 2)
4. Intake valve timing control solenoid 5. Knock sensor (bank 1 and 2) 6. Fuel injector (bank 2) K
valve (bank 2)
7. Ignition coil (with power transistor) and 8. Exhaust valve timing control position 9. Crankshaft position sensor (POS)
spark plug (bank 2) sensor (bank 2) L
10. Engine coolant temperature sensor 11. Camshaft position sensor (PHASE) 12. Transmission range switch
(bank 2)
13. Refrigerant pressure sensor 14. ECM 15. Battery current sensor
M
16. Condenser-2 17. EVAP canister purge volume control 18. Mass air flow sensor (with intake air
solenoid valve temperature sensor)
19. Camshaft position sensor (PHASE) 20. EVAP service port 21. Power valve actuator 2
(bank 1) N
22. Electric throttle control actuator 23. Exhaust valve timing control position 24. Ignition coil (with power transistor) and
sensor (bank 1) spark plug (bank 1)
25. Fuel injector (bank 1) 26. VIAS control solenoid valve 1 and 2 27. Power valve actuator 1 O
28. Exhaust valve timing control magnet 29. Power steering pressure sensor
retarder (bank 1)
P

Revision: August 2013 EC-119 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

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ALBIA0604ZZ

1. Mas air flow sensor (with intake air 2. Air cleaner case 3. Engine coolant temperature sensor
temperature sensor) (view with engine cover removed)
4. EVAP canister purge volume control 5. Power valve actuator 1 (view with en- 6. VIAS control solenoid valve 1
solenoid valve (view with engine cover gine cover removed)
removed)
7. VIAS control solenoid valve 2 8. Power valve actuator 2 9. Power steering pressure sensor
10. Tie rod (RH) 11. Camshaft position sensor (PHASE) 12. Exhaust valve timing control position
(bank 1) (view with air cleaner case re- sensor (bank 1)
moved)
13. Camshaft position sensor (PHASE) 14. Exhaust valve timing control position 15. Engine oil temperature sensor
(bank 2) (view with air cleaner case re- sensor (bank 2)
moved)
: Vehicle front

Revision: August 2013 EC-120 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

JMBIA1832GB F

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ALBIA0605ZZ
O
1. A/F sensor 1 (bank 1) (view with en- 2. A/F sensor 1 (bank 2) 3. HO2S2 (bank 1) harness connector
gine removed) (view with engine removed)
4. HO2S2 (bank 2) harness connector 5. Front engine mount 6. Crankshaft position sensor (POS) P
: Vehicle front

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 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

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ALBIA0606ZZ

1. Electronic controlled engine mount 2. EVAP control system pressure sensor 3. EVAP canister vent control valve
control solenoid valve (view with en- (view with rear suspension member re-
gine cover removed) moved)
4. EVAP canister 5. Fuel injector harness connector (view 6. Exhaust valve timing control magnet
with intake manifold collector removed) retarder (bank 1) (view with engine re-
moved)
7. Intake valve timing control solenoid 8. Intake valve timing control solenoid 9. Exhaust valve timing control magnet
valve (bank 1) valve (bank 2) retarder (bank 2)
: Vehicle front

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 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

EC

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L
ALBIA0607ZZ

1. Knock sensor (bank 2) (view with in- 2. Knock sensor (bank 1) 3. Transmission range switch M
take manifold removed) (view with CVT removed)
4. Battery 5. IPDM E/R 6. ECM
7. Refrigerant pressure sensor (view 8. Accelerator pedal position sensor N
with front grille removed)
: Vehicle front

Revision: August 2013 EC-123 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]

AWBIA0670ZZ

1. Stop lamp switch 2. ASCD brake switch 3. ASCD steering switch

Component Description INFOID:0000000010094841

cardiagn.com
Component Reference
Accelerator pedal position sensor EC-467, "Description"
Camshaft position sensor (PHASE) EC-300, "Description"
Crankshaft position sensor (POS) EC-296, "Description"
Engine coolant temperature sensor EC-201, "Description"
Mass air flow sensor EC-183, "Description"
Throttle position sensor EC-207, "Description"
Power valve 1 and 2 EC-518, "Description"
VIAS control solenoid valve 1 EC-442, "Description"
VIAS control solenoid valve 2 EC-445, "Description"

Revision: August 2013 EC-124 2014 Maxima NAM

 FUEL FILLER CAP WARNING SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
FUEL FILLER CAP WARNING SYSTEM
A
System Diagram INFOID:0000000010094842

EC

JPBIA5719GB

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G
System Description INFOID:0000000010094843

INPUT/OUTPUT SIGNAL CHART H

Input
Unit/Sensor Input signal to ECM ECM function
I
EVAP control system pressure sensor Pressure in purge line

Fuel level sensor signal* Fuel filler cap warning control

Combination meter
Fuel filler cap warning reset signal* J
*: This signal is sent to the ECM via the CAN communication line.
Output
K
Unit Output signal Actuator
ECM Fuel filler cap warning display signal* Combination meter

*: This signal is sent to the combination meter via the CAN communication line. L

SYSTEM DESCRIPTION
The fuel filler cap warning system alerts the driver to the prevention of the fuel filler being left uncapped and
M
malfunction occurrences after refueling, by turning ON the fuel filler cap warning display on the combination
meter.
ECM judges a refueled state, based on a fuel level signal transmitted from the combination meter.
When a very small leak is detected through the EVAP leak diagnosis performed after judging the refueled N
state, ECM transmits a fuel filler cap warning display signal (request for display ON) to the combination meter
via CAN communication.
When receiving the signal, the combination meter turns ON the fuel filler cap warning display. O
CAUTION:
Check fuel filler cap installation condition when the fuel filler cap warning display turns ON.
Reset Operation P
The fuel filler cap warning lamp tunes OFF, according to any condition listed below:
• Reset operation is performed by operating the meter mode switch on the combination meter.
- When the reset operation is performed, the combination meter transmits a fuel filler cap warning reset signal
to ECM via CAN communication. ECM transmits a fuel filler cap warning display signal (request for display
OFF) to the combination meter via CAN communication. When receiving the signal, the combination meter
turns OFF the fuel filler cap warning display.
• EVAP leak diagnosis result is normal.
• Fuel refilled.
Revision: August 2013 EC-125 2014 Maxima NAM
 FUEL FILLER CAP WARNING SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
• DTC erased by using CONSULT-III.
NOTE:
MIL turns ON if a malfunction is detected in leak diagnosis results again at the trip after the fuel filler cap warn-
ing display turns ON/OFF.

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 ON BOARD DIAGNOSTIC (OBD) SYSTEM
< SYSTEM DESCRIPTION > [VQ35DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
A
Diagnosis Description INFOID:0000000010094844

This system is an on board diagnostic system that records exhaust emission-related diagnostic information EC
and detects a sensors/actuator-related malfunction. A malfunction is indicated by the malfunction indicator
lamp (MIL) and stored in ECU memory as a DTC. The diagnostic information can be obtained with the diag-
nostic tool (GST: Generic Scan Tool).
C
GST (Generic Scan Tool) INFOID:0000000010094845

When GST is connected with a data link connector equipped on the vehicle side, it will communicate with the
control unit equipped in the vehicle and then enable various kinds of diagnostic tests. Refer to EC-127, "Diag- D
nosis Description".
NOTE:
Service $0A is not applied for regions where it is not mandated. E

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
DIAGNOSIS SYSTEM (ECM)
DIAGNOSIS DESCRIPTION
DIAGNOSIS DESCRIPTION : 1st Trip Detection Logic and Two Trip Detection Logic
INFOID:0000000010094846

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not illuminate at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL illuminates. The MIL illuminates at the same time when the DTC is stored.
<2nd trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is per-
formed during vehicle operation. Specific on board diagnostic items will cause the ECM to illuminate or blink
the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable

MIL DTC 1st trip DTC

1st trip 2nd trip 2nd trip
Items 1st trip 2nd trip 1st trip
Illuminat- Illuminat- display-
Blinking Blinking displaying displaying displaying
ed ed ing

Misfire (Possible three way catalyst

damage) — DTC: P0300 – P0308 × — — — — — × —

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is being detected
Misfire (Possible three way catalyst
damage) — DTC: P0300 – P0308 — — × — — × — —
is being detected
One trip detection diagnoses (Re-
— × — — × — — —
fer to EC-542, "DTC Index".)
Except above — — — × — × × —

DIAGNOSIS DESCRIPTION : DTC and Freeze Frame Data INFOID:0000000010094847

DTC AND 1ST TRIP DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not recur, the 1st trip DTC
will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are saved in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
For malfunctions in which 1st trip DTCs are displayed, refer to EC-542, "DTC Index". These items are
required by legal regulations to continuously monitor the system/component. In addition, the items monitored
non-continuously are also displayed on CONSULT.
1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5. 1st trip DTC detection occurs without illu-
minating the MIL and therefore does not warn the driver of a malfunction.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to EC-9, "Work Flow". Then perform DTC Confirmation
Procedure or Component Function Check to try to duplicate the malfunction. If the malfunction is duplicated,
the item requires repair.
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority A
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
EC
lowing priorities to update the data.

Priority Items
C
Freeze frame data Misfire — DTC: P0300 – P0308
1
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2 Except the above items
D
3 1st trip freeze frame data
For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was saved in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated E
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st
trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze F
frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the
ECM memory.

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Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem- G
ory is erased.
DIAGNOSIS DESCRIPTION : Counter System INFOID:0000000010094848

H
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
• When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory. I
• When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on.
• The MIL will turn OFF after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is
J
counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs
while counting, the counter will reset.
• The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) with-
out the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injec- K
tion System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern
C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CON-
SULT will count the number of times the vehicle is driven. L
• The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.
COUNTER SYSTEM CHART
M
Items Fuel Injection System Misfire Other
MIL (turns OFF) 3 (pattern B) 3 (pattern B) 3 (pattern B)
DTC, Freeze Frame Data (no display) 80 (pattern C) 80 (pattern C) 40 (pattern A) N
1st Trip DTC (clear) 1 (pattern C), *1 1 (pattern C), *1 1 (pattern B)
1st Trip Freeze Frame Data (clear) *1, *2 *1, *2 1 (pattern B)
O
For details about patterns B and C under “Fuel Injection System” and “Misfire”, see “EXPLANATION FOR
DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYS-
TEM”.
For details about patterns A and B under Other, see “EXPLANATION FOR DRIVING PATTERNS FOR “MIS- P
FIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”.
• *1: Clear timing is at the moment OK is detected.
• *2: Clear timing is when the same malfunction is detected in the 2nd trip.
Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for “Misfire <Exhaust Quality De-
terioration>”, “Fuel Injection System”

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]

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JMBIA1417GB

*1: When the same malfunction is de- *2: MIL will turn OFF after vehicle is driv- *3: When the same malfunction is de-
tected in two consecutive trips, MIL en 3 times (pattern B) without any tected in two consecutive trips, the
will light up. malfunctions. DTC and the freeze frame data will be
stored in ECM.
*4: The DTC and the freeze frame data *5: When a malfunction is detected for *6: The 1st trip DTC and the 1st trip
will not be displayed any longer after the first time, the 1st trip DTC and the freeze frame data will be cleared at
vehicle is driven 80 times (pattern C) 1st trip freeze frame data will be the moment OK is detected.
without the same malfunction. (The stored in ECM.
DTC and the freeze frame data still
remain in ECM.)
*7: When the same malfunction is de- *8: 1st trip DTC will be cleared when ve-
tected in the 2nd trip, the 1st trip hicle is driven once (pattern C) with-
freeze frame data will be cleared. out the same malfunction after DTC
is stored in ECM.

Explanation for Driving Patterns for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”
Driving Pattern B
Refer to EC-132, "DIAGNOSIS DESCRIPTION : Driving Pattern".

Revision: August 2013 EC-130 2014 Maxima NAM

 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Driving Pattern C
Refer to EC-132, "DIAGNOSIS DESCRIPTION : Driving Pattern". A
Example:
If the stored freeze frame data is as per the following:
Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F)
EC
To be satisfied with driving pattern C, the vehicle should run under the following conditions:
Engine speed: 475 – 1,225 rpm, Calculated load value: 27 – 33%, Engine coolant temperature: more than
70°C (158°F)
C
Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns Except For “Misfire <Exhaust
Quality Deterioration>”, “Fuel Injection System”
D

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G

JMBIA1418GB

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]

*1: When the same malfunction is de- *2: MIL will turn OFF after vehicle is driv- *3: When the same malfunction is de-
tected in two consecutive trips, MIL en 3 times (pattern B) without any tected in two consecutive trips, the
will light up. malfunctions. DTC and the freeze frame data will be
stored in ECM.
*4: The DTC and the freeze frame data *5: When a malfunction is detected for *6: 1st trip DTC will be cleared after vehi-
will not be displayed any longer after the first time, the 1st trip DTC and the cle is driven once (pattern B) without
vehicle is driven 40 times (pattern A) 1st trip freeze frame data will be the same malfunction.
without the same malfunction. stored in ECM.
(The DTC and the freeze frame data
still remain in ECM.)
*7: When the same malfunction is de-
tected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

Explanation for Driving Patterns Except for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection
System”
Driving Pattern A
Refer to EC-132, "DIAGNOSIS DESCRIPTION : Driving Pattern".
Driving Pattern B
Refer to EC-132, "DIAGNOSIS DESCRIPTION : Driving Pattern".

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DIAGNOSIS DESCRIPTION : Driving Pattern INFOID:0000000010094849

CAUTION:
Always drive at a safe speed.
DRIVING PATTERN A
Driving pattern A means a trip satisfying the following conditions.
• Engine speed reaches 400 rpm or more.
• Engine coolant temperature rises by 20°C (36°F) or more after starting the engine.
• Engine coolant temperature reaches 70°C (158°F) or more.
• The ignition switch is turned from ON to OFF.
NOTE:
• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern
A.
• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving
pattern A.
DRIVING PATTERN B
Driving pattern B means a trip satisfying the following conditions.
• Engine speed reaches 400 rpm or more.
• Engine coolant temperature reaches 70°C (158°F) or more.
• Vehicle speed of 70 – 120 km/h (44 – 75 MPH) is maintained for 60 seconds or more under the control of
closed loop.
• Vehicle speed of 30 – 60 km/h (19 – 37 MPH) is maintained for 10 seconds or more under the control of
closed loop.
• Under the closed loop control condition, the following state reaches 12 seconds or more in total: Vehicle
speed of 4 km/h (2 MPH) or less with idling condition.
• The state of driving at 10 km/h (7 MPH) or more reaches 10 minutes or more in total.
• A lapse of 22 minutes or more after engine start.
NOTE:
• Drive the vehicle at a constant velocity.
• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern
B.
• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving
pattern B.
DRIVING PATTERN C
Driving pattern C means operating vehicle as per the following:
The following conditions should be satisfied at the same time:
Engine speed: (Engine speed in the freeze frame data) ±375 rpm

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Calculated load value: (Calculated load value in the freeze frame data) x (1±0.1) [%]
Engine coolant temperature condition: A
• When the freeze frame data shows lower than 70°C (158°F), engine coolant temperature should be lower
than 70°C (158°F).
• When the freeze frame data shows higher than or equal to 70°C (158°F), engine coolant temperature should
EC
be higher than or equal to 70°C (158°F).
NOTE:
• When the same malfunction is detected regardless of the above vehicle conditions, reset the counter of driv-
ing pattern C. C
• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving
pattern C.
• The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is D
stored in ECM.
DIAGNOSIS DESCRIPTION : System Readiness Test (SRT) Code INFOID:0000000010094850

E
System Readiness Test (SRT) code is specified in Service $01 of SAE J1979/ISO 15031-5.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed. F
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use
the information in this Service Manual to set the SRT to “CMPLT”.

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In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT G
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's
normal driving pattern; the SRT will indicate “INCMP” for these items. H
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM mem-
ory power supply is interrupted for several hours. I
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
J
NOTE:
If permanent DTC is stored or MIL illuminates during the state emissions inspection, the vehicle is also
returned to the customer untested even though the SRT indicates “CMPLT” for all test items. Therefore, it is
important to check SRT (“CMPLT”), DTC (No DTCs) and permanent DTC (NO permanent DTCs) before the K
inspection.
SRT SET TIMING
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is L
done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and
is shown in the table below.
M
Example
Self-diagnosis result Ignition cycle
Diagnosis
← ON → OFF ← ON → OFF ← ON → OFF ← ON → N
All OK Case 1 P0400 OK (1) — (1) OK (2) — (2)
P0402 OK (1) — (1) — (1) OK (2)
P1402 OK (1) OK (2) — (2) — (2) O
SRT of EGR “CMPLT” “CMPLT” “CMPLT” “CMPLT”
Case 2 P0400 OK (1) — (1) — (1) — (1)
P
P0402 — (0) — (0) OK (1) — (1)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “INCMP” “INCMP” “CMPLT” “CMPLT”

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Example
Self-diagnosis result Ignition cycle
Diagnosis
← ON → OFF ← ON → OFF ← ON → OFF ← ON →
NG exists Case 3 P0400 OK OK — —
P0402 — — — —
NG
P1402 NG — NG (Consecutive
NG)
(1st trip) DTC
1st trip DTC — 1st trip DTC
DTC (= MIL ON)
SRT of EGR “INCMP” “INCMP” “INCMP” “CMPLT”
OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is NG.
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses show OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will
indicate “CMPLT”. → Case 1 above
When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate
“CMPLT” at the time the respective self-diagnoses have at least one OK result. → Case 2 above
If one or more SRT related self-diagnoses show NG results in 2 consecutive cycles, the SRT will also indicate

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“CMPLT”. → Case 3 above
The table above shows that the minimum number of cycles for setting SRT as “INCMP” is the number one (1)
for each self-diagnosis (Case 1 & 2) or the number two (2) for one of self-diagnoses (Case 3). However, in
preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice
(Case 3) for the following reasons:
• The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
• The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
• During SRT driving pattern, the 1st trip DTC (NG) is detected prior to “CMPLT” of SRT and the self-diagnosis
memory must be erased from the ECM after repair.
• If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out
prior to the state emission inspection even though the SRT indicates “CMPLT”.
DIAGNOSIS DESCRIPTION : Permanent Diagnostic Trouble Code (Permanent DTC)
INFOID:0000000010094851

Permanent DTC is defined in SAE J1979/ISO 15031-5 Service $0A.

ECM stores a DTC issuing a command of turning on MIL as a permanent DTC and keeps storing the DTC as
a permanent DTC until ECM judges that there is no presence of malfunction.
Permanent DTCs cannot be erased by using the Erase function of CONSULT or Generic Scan Tool (GST) and
by disconnecting the battery to shut off power to ECM. This prevents a vehicle from passing the state emission
inspection without repairing a malfunctioning part.
When not passing the state emission inspection due to more than one permanent DTC, permanent DTCs
should be erased, referring to this manual.
NOTE:
• The important items in state emission inspection are that MIL is not ON, SRT test items are set, and perma-
nent DTCs are not included.
• Permanent DTCs do not apply for regions that permanent DTCs are not regulated by law.
PERMANENT DTC SET TIMING
The setting timing of permanent DTC is stored in ECM with the lighting of MIL when a DTC is confirmed.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
DIAGNOSIS DESCRIPTION : Malfunction Indicator Lamp (MIL) INFOID:0000000010094852

A
When emission-related ECU detects a malfunction in the emission
control systems components and/or the powertrain control compo-
nents (which affect vehicle emissions), it turns on/blinks MIL to EC
inform the driver that a malfunction has been detected.
1. The MIL illuminates when ignition switch is turned ON (engine is
not running).
NOTE: C
Check the MIL circuit if MIL does not illuminate. Refer to EC-
507, "Component Function Check".
2. When the engine is started, the MIL should go off. D
NOTE:
If MIL continues to illuminate/blink, perform self-diagnoses and
JSBIA1315ZZ

inspect/repair accordingly because an emission-related ECU has detected a malfunction in the emission
control systems components and/or the powertrain control components (which affect vehicle emissions). E

On Board Diagnosis Function INFOID:0000000010094853

F
ON BOARD DIAGNOSIS ITEM
The on board diagnostic system has the following functions.

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G
Diagnostic test mode Function
Bulb check MIL can be checked.
SRT status ECM can read if SRT codes are set. H
Malfunction warning If ECM detects a malfunction, it illuminates or blinks MIL to inform the driver that a malfunction has
been detected.
Self-diagnostic results DTCs or 1st trip DTCs stored in ECM can be read. I
Accelerator pedal released po- ECM can learn the accelerator pedal released position. Refer to EC-20, "ACCELERATOR PEDAL
sition learning RELEASED POSITION LEARNING : Description".
Throttle valve closed position ECM can learn the throttle valve closed position. Refer to EC-21, "THROTTLE VALVE CLOSED PO- J
learning SITION LEARNING : Description".
Idle air volume learning ECM can learn the idle air volume. Refer to EC-21, "IDLE AIR VOLUME LEARNING : Description".
Mixture ratio self-learning value Mixture ratio self-learning value can be erased. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING K
clear VALUE CLEAR : Description".

BULB CHECK MODE

L
Description
This function allows damage inspection in the MIL bulb (blown, open circuit, etc.).
Operation Procedure M
1. Turn ignition switch ON.
2. The MIL on the instrument panel should stay ON.
If it remains OFF, check MIL circuit. Refer to EC-507, "Diagnosis Procedure". N

SRT STATUS MODE

Description O
This function allows to read if ECM has completed the self-diagnoses of major emission control systems and
components. For SRT, refer to EC-133, "DIAGNOSIS DESCRIPTION : System Readiness Test (SRT) Code".
Operation Procedure P
1. Turn ignition switch ON and wait 20 seconds.
2. SRT status is indicated as shown blow.
• ECM continues to illuminate MIL if all SRT codes are set.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
• ECM blinks MIL for about 10 seconds if all SRT codes are not set.

JMBIA1515GB

MALFUNCTION WARNING MODE

Description
In this function ECM turns on or blinks MIL when it detects a malfunction in the emission control system com-

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ponents and/or the powertrain control components (which affect vehicle emissions) to inform the driver that a
malfunction has been detected.
Operation Procedure
1. Turn ignition switch ON.
2. Check that MIL illuminates.
If it remains OFF, check MIL circuit. Refer to EC-507, "Diagnosis Procedure".
3. Start engine and let it idle.
• For two trip detection logic diagnoses, ECM turns on MIL when it detects the same malfunction twice in
the two consecutive driving cycles.
• For 1st trip detection logic diagnoses, ECM turns on MIL when it detects a malfunction in one driving
cycle.
• ECM blinks MIL when it detects a malfunction that may damage the three way catalyst (misfire).
SELF-DIAGNOSTIC RESULTS MODE
Description
This function allows to indicate DTCs or 1st trip DTCs stored in ECM according to the number of times MIL is
blinking.
How to Set Self-diagnostic Results Mode
NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a mal-
function.
• After ignition switch is turned off, ECM is always released from the “self-diagnostic results” mode.
1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 seconds.
• Fully depress the accelerator pedal.
• Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it depressed for approx. 10 seconds until the
MIL starts blinking.
NOTE:
Do not release the accelerator pedal for 10 seconds if MIL starts blinking during this period. This blinking
is displaying SRT status and is continued for another 10 seconds.
4. Fully release the accelerator pedal.
ECM has entered to “Self-diagnostic results” mode.
NOTE:

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Wait until the same DTC (or 1st trip DTC) appears to completely confirm all DTCs.
A

EC

PBIB0092E

How to Read Self-diagnostic Results D

The DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL E
illuminates in “malfunction warning” mode, it is a DTC; if two or more codes are displayed, they may be either
DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified codes can be identified by
using the CONSULT or GST. A DTC will be used as an example for how to read a code.
F

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G

N
PBIB3005E

A particular trouble code can be identified by the number of four-digit numeral flashes per the following.
O
Number 0 1 2 3 4 5 6 7 8 9 A B C D E F
Flashes 10 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16
The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-sec- P
onds) - OFF (0.6-seconds) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-seconds ON and 0.3-seconds OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-seconds OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. Refer to EC-542, "DTC Index".

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
How to Erase Self-diagnostic Results
By performing this procedure, ECM memory is erased and the following diagnostic information is erased as
well.
• Diagnostic trouble codes
• 1st trip diagnostic trouble codes
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
NOTE:
Also, if a battery terminal is disconnected, ECM memory is erased and the diagnostic information as listed
above is erased. (The amount of time required for erasing may vary from a few seconds to several hours.)
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Set ECM in “self-diagnostic results” mode.
6. The diagnostic information has been erased from the backup memory in the ECM.
Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.
7. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

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CONSULT Function INFOID:0000000010094854

FUNCTION

Diagnostic test mode Function

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
Self Diagnostic Result
can be read and erased quickly.*
Data Monitor Input/Output data in the ECM can be read.
This mode enables a technician to adjust some devices faster and more accurately by following the
Work support
indications on the CONSULT unit.
Diagnostic Test Mode in which CONSULT drives some actuators apart from the ECMs and also shifts
Active Test
some parameters in a specified range.
ECU Identification ECM part number can be read.
DTC Work Support The status of system monitoring tests and the self-diagnosis status/results can be confirmed.
*: The following emission-related diagnostic information is cleared when the ECM memory is erased.
• Diagnostic trouble codes
• 1st trip diagnostic trouble codes
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
SELF DIAGNOSTIC RESULT MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to EC-542, "DTC Index".
How to Read DTC and 1st Trip DTC
DTCs and 1st trip DTCs related to the malfunction are displayed in “self-diag results”.
• When ECM detects a 1st trip DTC, 1t” is displayed for “TIME”.
• When ECM has detected a current DTC, “0” is displayed for “TIME”.
• If “TIME” is neither “0” nor “1t”, the DTC occurred in the past and ECM shows the number of times the vehi-
cle has been driven since the last detection of the DTC.
How to Erase DTC and 1st Trip DTC
NOTE:

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
• If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again. A
• If the DTC is not for A/T related items (see EC-542, "DTC Index"), skip step 1.
1. Erase DTC in TCM. Refer to EC-542, "DTC Index".
2. Select “ENGINE” with CONSULT. EC
3. Select “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (DTC in ECM will be erased.)
C
Freeze Frame Data and 1st Trip Freeze Frame Data

Freeze frame data item* Description

D
DIAG TROUBLE CODE • The engine control component part/control system has a trouble code that is displayed as PXXXX. (Refer
[PXXXX] to EC-542, "DTC Index".)
FUEL SYS-B1 • “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of the following mode is displayed. E
Mode2: Open loop due to detected system malfunction
FUEL SYS-B2 Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
F
Mode5: Open loop - has not yet satisfied condition to go to closed loop
CAL/LD VALUE [%] • The calculated load value at the moment a malfunction is detected is displayed.

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COOLANT TEMP [°C] or G
• The engine coolant temperature at the moment a malfunction is detected is displayed.
[°F]
L-FUEL TRM-B1 [%] • “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
L-FUEL TRM-B2 [%] than short-term fuel trim.
H

S-FUEL TRM-B1 [%] • “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
S-FUEL TRM-B2 [%] schedule. I
ENGINE SPEED [rpm] • The engine speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
• The vehicle speed at the moment a malfunction is detected is displayed. J
[km/h] or [mph]
ABSOL TH·P/S [%] • The throttle valve opening angle at the moment a malfunction is detected is displayed.
B/FUEL SCHDL [msec] • The base fuel schedule at the moment a malfunction is detected is displayed.
K
INT/A TEMP SE [°C] or
• The intake air temperature at the moment a malfunction is detected is displayed.
[°F]
INT MANI PRES [kPa] L
• These items are displayed but are not applicable to this model.
COMBUST CONDITION
*: The items are the same as those of 1st trip freeze frame data.
M
DATA MONITOR MODE
NOTE:
The following table includes information (items) inapplicable to this vehicle. For information (items) applicable
to this vehicle, refer to CONSULT display items. N

Monitored Item
For reference values of the following items, refer to EC-522, "Reference Value".
O
Monitored item Unit Description Remarks
• Accuracy becomes poor if engine
• Indicates the engine speed computed from the speed drops below the idle rpm. P
ENG SPEED rpm signal of the crankshaft position sensor (POS) • If the signal is interrupted while the
and camshaft position sensor (PHASE). engine is running, an abnormal value
may be indicated.
• When the engine is stopped, a certain
• The signal voltage of the mass air flow sensor is value is indicated.
MAS A/F SE-B1 V
displayed. • When engine is running, specification
range is indicated in “SPEC”.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Monitored item Unit Description Remarks
• “Base fuel schedule” indicates the fuel injection
• When engine is running, specification
B/FUEL SCHDL ms pulse width programmed into ECM, prior to any
range is indicated in “SPEC”.
learned on board correction.
A/F ALPHA-B1 • When the engine is stopped, a certain
value is indicated.
• The mean value of the air-fuel ratio feedback cor- • This data also includes the data for
%
A/F ALPHA-B2 rection factor per cycle is indicated. the air-fuel ratio learning control.
• When engine is running, specification
range is indicated in “SPEC”.
• When the engine coolant temperature
• The engine coolant temperature (determined by sensor is open or short-circuited,
COOLANT TEMP/S °C or °F the signal voltage of the engine coolant tempera- ECM enters fail-safe mode. The en-
ture sensor) is displayed. gine coolant temperature determined
by the ECM is displayed.
A/F SEN1 (B1) • The A/F signal computed from the input signal of
V
A/F SEN1 (B2) the air fuel ratio (A/F) sensor 1 is displayed.

HO2S2 (B1) • The signal voltage of the heated oxygen sensor 2

V
HO2S2 (B2) is displayed.

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HO2S2 MNTR(B1) • Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after three
• When the engine is stopped, a certain
RICH/LEAN way catalyst is relatively small.
HO2S2 MNTR(B2) value is indicated.
LEAN: means the amount of oxygen after three
way catalyst is relatively large.
• The vehicle speed computed from the vehicle
VHCL SPEED SE km/h or mph speed signal sent from combination meter is dis-
played.
BATTERY VOLT V • The power supply voltage of ECM is displayed.
ACCEL SEN 1 • ACCEL SEN 2 signal is converted by
• The accelerator pedal position sensor signal volt-
V ECM internally. Thus, it differs from
ACCEL SEN 2 age is displayed.
ECM terminal voltage signal.
TP SEN 1-B1 • TP SEN 2-B1 signal is converted by
• The throttle position sensor signal voltage is dis-
V ECM internally. Thus, it differs from
TP SEN 2-B1 played.
ECM terminal voltage signal.
• The fuel temperature (determined by the signal
FUEL T/TMP SE °C or °F voltage of the fuel tank temperature sensor) is
displayed.
• The intake air temperature (determined by the
INT/A TEMP SE °C or °F signal voltage of the intake air temperature sen-
sor) is indicated.
• The signal voltage of EVAP control system pres-
EVAP SYS PRES V
sure sensor is displayed.
• The signal voltage of the fuel level sensor is dis-
FUEL LEVEL SE V
played.
• Indicates start signal status [ON/OFF] computed • After starting the engine, [OFF] is dis-
START SIGNAL ON/OFF by the ECM according to the signals of engine played regardless of the starter sig-
speed and battery voltage. nal.
• Indicates idle position [ON/OFF] computed by
CLSD THL POS ON/OFF ECM according to the accelerator pedal position
sensor signal.
• Indicates [ON/OFF] condition of the air condition-
AIR COND SIG ON/OFF er switch as determined by the air conditioner sig-
nal.
• Indicates [ON/OFF] condition from the park/neu-
P/N POSI SW ON/OFF
tral position (PNP) signal.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Monitored item Unit Description Remarks
A
• [ON/OFF] condition of the power steering system
PW/ST SIGNAL ON/OFF (determined by the signal voltage of the power
steering pressure sensor) is indicated.
• Indicates [ON/OFF] condition from the electrical EC
load signal.
ON: Rear window defogger switch is ON and/or
LOAD SIGNAL ON/OFF
lighting switch is in 2nd position.
OFF: Both rear window defogger switch and light-
C
ing switch are OFF.
• Indicates [ON/OFF] condition from ignition switch
IGNITION SW ON/OFF D
signal.
• Indicates [ON/OFF] condition from the heater fan
HEATER FAN SW ON/OFF
switch signal.
• Indicates [ON/OFF] condition from the stop lamp E
BRAKE SW ON/OFF
switch signal.
INJ PULSE-B1 • Indicates the actual fuel injection pulse width
• When the engine is stopped, a certain
msec compensated by ECM according to the input sig-
computed value is indicated.
F
INJ PULSE-B2 nals.
• Indicates the ignition timing computed by ECM • When the engine is stopped, a certain

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IGN TIMING BTDC
according to the input signals. value is indicated. G
• “Calculated load value” indicates the value of the
CAL/LD VALUE %
current air flow divided by peak air flow.
• Indicates the mass air flow computed by ECM ac- H
MASS AIRFLOW g/s cording to the signal voltage of the mass air flow
sensor.
• Indicates the EVAP canister purge volume con-
I
trol solenoid valve control value computed by the
PURG VOL C/V % ECM according to the input signals.
• The opening becomes larger as the value in-
creases. J
INT/V TIM(B1) • Indicates [°CA] of intake camshaft advance an-
°CA
INT/V TIM(B2) gle.

EXH/V TIM B1 K
°CA • Indicates [°CA] of exhaust camshaft retard angle.
EXH/V TIM B2
INT/V SOL(B1) • The control value of the intake valve timing con- L
trol solenoid valve (determined by ECM accord-
% ing to the input signals) is indicated.
INT/V SOL(B2) • The advance angle becomes larger as the value
increases. M
VTC DTY EX B1 • The control value of the exhaust valve timing con-
trol magnet retarder (determined by ECM accord-
% ing to the input signals) is indicated.
VTC DTY EX B2 • The retard angle becomes larger as the value in-
N
creases.
• The control condition of the VIAS control solenoid
valve 1 (determined by ECM according to the in- O
put signals) is indicated.
VIAS S/V-1 ON/OFF
ON: VIAS control solenoid valve 1 is operating.
OFF: VIAS control solenoid valve 1 is not operat-
ing. P
• The control condition of the VIAS control solenoid
valve 2 (determined by ECM according to the in-
put signals) is indicated.
VIAS S/V-2 ON/OFF
ON: VIAS control solenoid valve 2 is operating.
OFF: VIAS control solenoid valve 2 is not operat-
ing.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Monitored item Unit Description Remarks
• The air conditioner relay control condition (deter-
AIR COND RLY ON/OFF mined by ECM according to the input signals) is
indicated.
• The control condition of the electronic controlled
engine mount (determined by ECM according to
ENGINE MOUNT IDLE/RUN the input signals) is indicated.
IDLE: Engine speed is below 950 rpm
RUN: Engine speed is above 950 rpm
• Indicates the fuel pump relay control condition
FUEL PUMP RLY ON/OFF determined by ECM according to the input sig-
nals.
• The control condition of the EVAP canister vent
control valve (determined by ECM according to
VENT CONT/V ON/OFF the input signals) is indicated.
ON: Closed
OFF: Open
• Indicates the throttle control motor relay control
THRTL RELAY ON/OFF condition determined by the ECM according to
the input signals.

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• The control condition of the cooling fan (deter-
mined by ECM according to the input signals) is
indicated.
HI/MID/LOW/
COOLING FAN HI: High speed operation
OFF
MID: Middle speed operation
LOW: Low speed operation
OFF: Stop
HO2S2 HTR (B1) • Indicates [ON/OFF] condition of heated oxygen
ON/OFF sensor 2 heater determined by ECM according to
HO2S2 HTR (B2) the input signals.
• Indicates the engine speed computed from the in-
I/P PULLY SPD rpm
put speed sensor signal.
• The vehicle speed computed from the vehicle
VEHICLE SPEED km/h or mph
speed signal sent from TCM is displayed.
• Displays the condition of idle air volume learning
YET: Idle Air Volume Learning has not been per-
IDL A/V LEARN YET/CMPLT formed yet.
CMPLT: Idle Air Volume Learning has already
been performed successfully.
• The engine oil temperature (determined by the
ENG OIL TEMP °C or °F signal voltage of the engine oil temperature sen-
sor) is displayed.
TRVL AFTER MIL km or mile • Distance traveled while MIL is activated.
A/F S1 HTR(B1) • Air fuel ratio (A/F) sensor 1 heater control value
computed by ECM according to the input signals.
%
A/F S1 HTR(B2) • The current flow to the heater becomes larger as
the value increases.
• The signal voltage from the refrigerant pressure
AC PRESS SEN V
sensor is displayed.
• The vehicle speed computed from the vehicle
VHCL SPEED SE km/h or mph speed signal sent from combination meter is dis-
played.
SET VHCL SPD km/h or mph • The preset vehicle speed is displayed.
• Indicates [ON/OFF] condition from MAIN switch
MAIN SW ON/OFF
signal.
• Indicates [ON/OFF] condition from CANCEL
CANCEL SW ON/OFF
switch signal.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Monitored item Unit Description Remarks
A
• Indicates [ON/OFF] condition from RESUME/AC-
RESUME/ACC SW ON/OFF
CELERATE switch signal.
• Indicates [ON/OFF] condition from SET/COAST
SET SW ON/OFF EC
switch signal.
• Indicates [ON/OFF] condition from ASCD brake
BRAKE SW1 ON/OFF
switch signal.
• Indicates [ON/OFF] condition of stop lamp switch C
BRAKE SW2 ON/OFF
signal.
• Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the ASCD D
set speed.
VHCL SPD CUT NON/CUT
CUT: Vehicle speed decreased to excessively
low compared with the ASCD set speed, and
ASCD operation is cut off. E
• Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the ASCD
LO SPEED CUT NON/CUT set speed. F
CUT: Vehicle speed decreased to excessively
low, and ASCD operation is cut off.

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• Indicates [ON/OFF] condition of CVT O/D ac- G
AT OD MONITOR ON/OFF
cording to the input signal from the TCM.
• Indicates [ON/OFF] condition of CVT O/D cancel
AT OD CANCEL ON/OFF
request signal.
H
• Indicates [ON/OFF] condition of CRUISE lamp
CRUISE LAMP ON/OFF determined by the ECM according to the input
signals.
I
• Indicates [ON/OFF] condition of SET lamp deter-
SET LAMP ON/OFF
mined by the ECM according to the input signals.
• Displays the condition of exhaust valve timing
control learning J
YET: Exhaust valve timing control Learning has
EXH V/T LEARN YET/CMPLT
not been performed yet.
CMPLT: Exhaust valve timing control Learning
has already been performed successfully.
K
• The control condition of the power generation
voltage variable control (determined by ECM ac-
cording to the input signals) is indicated. L
ALT DUTY SIG ON/OFF ON: Power generation voltage variable control is
active.
OFF: Power generation voltage variable control
is inactive. M
A/F ADJ-B1 • Indicates the correction of a factor stored in ECM.
The factor is calculated from the difference be-
— tween the target air-fuel ratio stored in ECM and N
A/F ADJ-B2 the air-fuel ratio calculated from A/F sensor 1 sig-
nal.
• The signal voltage of battery current sensor is O
BAT CUR SEN mV
displayed.
• Indicates the duty ratio of the power generation
ALT DUTY % command value. The ratio is calculated by ECM
based on the battery current sensor signal. P

THRTL STK CNT B1* — —

• Indicates the condition of EVAP leak diagnosis.
- YET: EVAP leak diagnosis has not been per-
EVAP LEAK DIAG YET/CMPLT formed yet.
- CMPLT: EVAP leak diagnosis has been per-
formed successfully.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Monitored item Unit Description Remarks
• Indicates the ready condition of EVAP leak diag-
nosis.
EVAP DIAG READY ON/OFF
- ON: Diagnosis has been ready condition.
- OFF: Diagnosis has not been ready condition.
• Indicates DTC P015A or P015B self-diagnosis
A/F SEN1 DIAG1 INCMP/CM- condition.
(B1) PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
• Indicates DTC P015C or P015D self-diagnosis
A/F SEN1 DIAG1 INCMP/CM- condition.
(B2) PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
• Indicates DTC P014C or P014D self-diagnosis
A/F SEN1 DIAG2 INCMP/CM- condition.
(B1) PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
• Indicates DTC P014E or P014F self-diagnosis
A/F SEN1 DIAG2 INCMP/CM- condition.
(B2) PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

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• Indicates DTC P014C, P014D, P015A or P015B
self-diagnosis condition.
A/F SEN1 DIAG3 ABSNT/ ABSNT: The vehicle condition is not within the di-
(B1) PRSNT agnosis range.
PRSNT: The vehicle condition is within the diag-
nosis range.
• Indicates DTC P014C, P014D, P015A or P015B
self-diagnosis condition.
A/F SEN1 DIAG3 ABSNT/ ABSNT: The vehicle condition is not within the di-
(B2) PRSNT agnosis range.
PRSNT: The vehicle condition is within the diag-
nosis range.
• Indicates DTC P0139 self-diagnosis (delayed re-
INCMP/CM- sponce) condition.
HO2 S2 DIAG1(B1)
PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
• Indicates DTC P0159 self-diagnosis (delayed re-
INCMP/CM- sponce) condition.
HO2 S2 DIAG1(B2)
PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
• Indicates DTC P0139 self-diagnosis (slow re-
INCMP/CM- sponce) condition.
HO2 S2 DIAG2(B1)
PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
• Indicates DTC P0159 self-diagnosis (slow re-
INCMP/CM- sponce) condition.
HO2 S2 DIAG2(B2)
PLT INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
Displays a determined value of atmospheric correc-
tion factor necessary for correcting an A/F sensor
A/F-S ATMSPHRC
— signal input to ECM. The signal used for the correc-
CRCT B1
tion is an A/F sensor signal transmitted while driving
under atmospheric pressure.
Displays a determined value of atmospheric correc-
tion factor necessary for correcting an A/F sensor
A/F-S ATMSPHRC
— signal input to ECM. The signal used for the correc-
CRCT B2
tion is an A/F sensor signal transmitted while driving
under atmospheric pressure.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Monitored item Unit Description Remarks
A
A/F-S ATMSPHRC Displays the number of updates of the A/F sensor
count
CRCT UP B1 atmospheric correction factor.
A/F-S ATMSPHRC Displays the number of updates of the A/F sensor
count EC
CRCT UP B2 atmospheric correction factor.
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically. C

WORK SUPPORT MODE

Work Item D

WORK ITEM CONDITION USAGE

FUEL PRESSURE RELEASE • FUEL PUMP WILL STOP BY TOUCHING “START” DUR- When releasing fuel pressure from E
ING IDLING. fuel line
CRANK A FEW TIMES AFTER ENGINE STALLS.
IDLE AIR VOL LEARN • THE IDLE AIR VOLUME THAT KEEPS THE ENGINE When learning the idle air volume F
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.

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SELF-LEARNING CONT • THE COEFFICIENT OF SELF-LEARNING CONTROL When clearing mixture ratio self-
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF- learning value G
FICIENT.
EXH V/T CONTROL LEARN • IN THIS MODE, OPERATION TO LEARN EXHAUST When learning the exhaust valve
VALVE TIMING CONTROL MAGNET RETARDER CHAR- timing control H
ACTERISTIC.
EVAP SYSTEM CLOSE CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN When detecting EVAP vapor leak-
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE age in the EVAP system I
FOLLOWING CONDITIONS.
• IGN SW ON
• ENGINE NOT RUNNING
• AMBIENT TEMPERATURE IS ABOVE 0°C (32°F). J
• NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM
• FUEL TANK TEMP. IS MORE THAN 0°C (32°F).
• WITHIN 10 MINUTES AFTER STARTING “EVAP SYS- K
TEM CLOSE”
• WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE”
UNDER THE CONDITION EXCEPT ABOVE, CONSULT
WILL DISCONTINUE IT AND DISPLAY APPROPRIATE
L
INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT MAY DISPLAY M
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”,
EVEN WHEN IN USING A CHARGED BATTERY.
VIN REGISTRATION • IN THIS MODE, VIN IS REGISTERED IN ECM. When registering VIN in ECM
N
TARGET IDLE RPM ADJ* • IDLE CONDITION When setting target idle speed
TARGET IGN TIM ADJ* • IDLE CONDITION When adjusting target ignition tim-
ing
O
When learning the throttle valve
CLSD THL POS LEARN • IGNITION ON AND ENGINE STOPPED.
closed position
SAVING DATA FOR REPLC CPU • In this mode, save data that is in ECM. When ECM is replaced. P
• In this mode, write data stored by “SAVE DATA FOR CPU
WRITING DATA FOR REPLC CPU When ECM is replaced.
REPLC” in work support mode to ECM.
*: This function is not necessary in the usual service procedure.

ACTIVE TEST MODE

Test Item

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]

TEST ITEM CONDITION JUDGMENT CHECK ITEM (REMEDY)

• Engine: Return to the original
• Harness and connectors
FUEL INJEC- trouble condition If trouble symptom disappears, see
• Fuel injector
TION • Change the amount of fuel injec- CHECK ITEM.
• Air fuel ratio (A/F) sensor 1
tion using CONSULT.
• Engine: Return to the original
trouble condition
IGNITION TIM- If trouble symptom disappears, see
• Timing light: Set • Perform Idle Air Volume Learning.
ING CHECK ITEM.
• Retard the ignition timing using
CONSULT.
• Engine: After warming up, idle the • Harness and connectors
engine. • Compression
POWER BAL- • A/C switch OFF • Fuel injector
Engine runs rough or stops.
ANCE • Selector lever: P or N • Power transistor
• Cut off each injector signal one at • Spark plug
a time using CONSULT. • Ignition coil
• Ignition switch: ON
• Harness and connectors
• Turn the cooling fan “HI”, “MID”,
COOLING FAN* Cooling fan moves and stops. • Cooling fan motor
“LOW” and “OFF” using CON-
• IPDM E/R
SULT.

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• Engine: Return to the original • Harness and connectors
ENG COOLANT trouble condition If trouble symptom disappears, see • Engine coolant temperature sen-
TEMP • Change the engine coolant tem- CHECK ITEM. sor
perature using CONSULT. • Fuel injector
• Ignition switch: ON (Engine
stopped)
FUEL PUMP RE- Fuel pump relay makes the operat- • Harness and connectors
• Turn the fuel pump relay “ON”
LAY ing sound. • Fuel pump relay
and “OFF” using CONSULT and
listen to operating sound.
• Ignition switch: ON
• Turn solenoid valve “ON” and Solenoid valve makes the operating • Harness and connectors
VIAS S/V-1
“OFF” using CONSULT and listen sound. • Solenoid valve
to operating sound.
• Ignition switch: ON
• Turn solenoid valve “ON” and Solenoid valve makes the operating • Harness and connectors
VIAS S/V-2
“OFF” using CONSULT and listen sound. • Solenoid valve
to operating sound.
• Ignition switch: ON
ENGINE • Turn electronic controlled engine Electronic controlled engine mount • Harness and connectors
MOUNTING mount “IDLE” and “TRVL” with makes the operating sound. • Electronic controlled engine mount
CONSULT.
• Engine: After warming up, run en-
gine at 1,500 rpm.
PURG VOL • Change the EVAP canister purge Engine speed changes according to • Harness and connectors
CONT/V volume control solenoid valve the opening percent. • Solenoid valve
opening percent using CON-
SULT.
FUEL/T TEMP
• Change the fuel tank temperature using CONSULT.
SEN
• Ignition switch: ON (Engine
stopped)
VENT CON- Solenoid valve makes an operating • Harness and connectors
• Turn solenoid valve “ON” and
TROL/V sound. • Solenoid valve
“OFF” with the CONSULT and lis-
ten to operating sound.
• Engine: Return to the original
• Harness and connectors
INT V/T ASSIGN non-standard condition If malfunctioning symptom disap-
• Intake valve timing control sole-
ANGLE • Change intake valve timing using pears, see CHECK ITEM.
noid valve
CONSULT.

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
TEST ITEM CONDITION JUDGMENT CHECK ITEM (REMEDY)
A
• Engine: Return to the original
• Harness and connectors
EXH V/T ASSIGN non-standard condition If malfunctioning symptom disap-
• Exhaust valve timing control mag-
ANGLE • Change exhaust valve timing us- pears, see CHECK ITEM.
net retarder
ing CONSULT. EC
• Engine: Idle • Harness and connectors
ALTERNATOR
• Change duty ratio using CON- Battery voltage changes. • IPDM E/R
DUTY
SULT. • Alternator
C
*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.

DTC WORK SUPPORT MODE

D
Test Item

Test mode Test item Corresponding DTC No. Reference page

E
P0442 EC-316
EVP V/S LEAK P0456/P1456* P0455 EC-358
EVAPORATIVE SYSTEM P0456 EC-364 F
PURG VOL CN/V P1444 P0443 EC-323

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PURG FLOW P0441 P0441 EC-310
G
A/F SEN1(B1) P1278/P1279 — —
A/F SEN1(B1) P1276 P0130 EC-218
A/F SEN1
A/F SEN1(B2) P1288/P1289 — — H
A/F SEN1(B2) P1286 P0150 EC-218
HO2S2(B1) P1146 P0138 EC-237
HO2S2(B1) P1147 P0137 EC-230 I
HO2S2(B1) P0139 P0139 EC-247
HO2S2
HO2S2(B2) P1166 P0158 EC-237
J
HO2S2(B2) P1167 P0157 EC-230
HO2S2(B2) P0159 P0159 EC-247
*: DTC P1442 and P1456 does not apply to this model but appears in DTC Work Support Mode screens. K

SRT & P-DTC MODE

SRT STATUS Mode L
• For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT screen; for items whose SRT
codes are not set, “INCMP” is displayed.
• “SRT STATUS” provides the presence or absence of permanent DTCs stored in ECM memory. M
PERMANENT DTC STATUS Mode

How to display permanent DTC status

1. Turn ignition switch OFF and wait at least 10 seconds. N
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON. O
5. Select “PERMANENT DTC STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.
NOTE:
Permanent DTCs stored in ECM memory are displayed on the CONSULT screen to show if a driving pat-
P
tern required for erasing permanent DTCs is complete (CMPLT) or incomplete (INCMP).
CAUTION:

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 DIAGNOSIS SYSTEM (ECM)
< SYSTEM DESCRIPTION > [VQ35DE]
Since the “PERMANENT DTC STATUS” screen displays the previous trip information, repeat the
following twice to update the information: “Ignition switch OFF”, “Wait for more than 10 seconds”
and “Ignition switch ON”.

JSBIA0062GB

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NOTE:
This mode is not used in regions that permanent DTCs are not regulated by law.
SRT WORK SUPPORT Mode
This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.
PERMANENT DTC WORK SUPPORT Mode
This mode enables a technician to drive a vehicle to complete the driving pattern that is required for erasing
permanent DTC.
NOTE:
This mode is not used in regions that permanent DTCs are not regulated by law.

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 TROUBLE DIAGNOSIS - SPECIFICATION VALUE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

DTC/CIRCUIT DIAGNOSIS A
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Description INFOID:0000000010094855
EC
The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-
TOR” mode of CONSULT during normal operation of the Engine Control System. When the value in “SPEC” in
“DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have one or more mal- C
functions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate
the MIL. D
The SP value will be displayed for the following three items:
• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-
tion)
• A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle) E
• MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Component Function Check INFOID:0000000010094856
F
1.START

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Check that all of the following conditions are satisfied. G
• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm2, 14.25 - 15.12 psi)
• Atmospheric temperature: 20 - 30°C (68 - 86°F) H
• Engine coolant temperature: 75 - 95°C (167 - 203°F)
• Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SEN” in
“DATA MONITOR” mode of “CVT” system indicates less than 0.9 V. I
• Electrical load: Not applied
- Rear window defogger switch, air conditioner switch lighting switch are OFF. Steering wheel is straight
ahead. J
• Engine speed: Idle

>> GO TO 2. K
2.PERFORM “SPEC” OF “DATA MONITOR” MODE
With CONSULT
L
NOTE:
Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1. Perform “EC-14, "BASIC INSPECTION : Special Repair Requirement".
2. Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2” and “MAS A/F SE-B1” in “SPEC” of “DATA M
MONITOR” mode with CONSULT.
3. Check that monitor items are within the SP value.
Is the measurement value within the SP value? N
YES >> INSPECTION END
NO >> Go to EC-150, "Diagnosis Procedure".
O

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 TROUBLE DIAGNOSIS - SPECIFICATION VALUE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010094857

OVERALL SEQUENCE

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JMBIA1468GB

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 TROUBLE DIAGNOSIS - SPECIFICATION VALUE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

EC

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G

PBIB3214E

DETAILED PROCEDURE P
1.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
With CONSULT
1. Start engine.
2. Confirm that the testing conditions are met. Refer to EC-149, "Component Function Check".
3. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.

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 TROUBLE DIAGNOSIS - SPECIFICATION VALUE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1 minute because they may fluctuate. It is NG
if the indication is out of the SP value even a little.
Is the measurement value within the SP value?
YES >> GO TO 17.
NO-1 >> Less than the SP value: GO TO 2.
NO-2 >> More than the SP value: GO TO 3.
2.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> GO TO 4.
NO >> More than the SP value: GO TO 19.
3.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> GO TO 6.

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NO-1 >> More than the SP value: GO TO 6.
NO-2 >> Less than the SP value: GO TO 25.
4.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1. Stop the engine.
2. Disconnect PCV hose, and then plug it.
3. Start engine.
4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 5.
NO >> GO TO 6.
5.CHANGE ENGINE OIL
1. Stop the engine.
2. Change engine oil.
NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
ditions.

>> INSPECTION END

6.CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC-592, "Inspection".)
Is the inspection result normal?
YES >> GO TO 9.
NO-1 >> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly”, refer to FL-6, "Removal
and Installation", and then. GO TO 8.
NO-2 >> Fuel pressure is too low: GO TO 7.
7.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly” and then GO TO 8. (Refer to FL-6, "Removal and
Installation".)
NO >> Repair or replace malfunctioning part and then GO TO 8.
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< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

8.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2” A

1. Start engine.
2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.
EC
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 9.
C
9. PERFORM POWER BALANCE TEST
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.
2. Check that each cylinder produces a momentary engine speed drop. D
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 10. E
10.DETECT MALFUNCTIONING PART
Check the following below. F
• Ignition coil and its circuit (Refer to EC-502, "Component Function Check".)
• Fuel injector and its circuit (Refer to EC-496, "Component Function Check".)
• Intake air leakage

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• Low compression pressure (Refer to EM-22, "On-Vehicle Service".) G
Is the inspection result normal?
YES >> Replace fuel injector and then GO TO 11. (Refer to EM-43, "Removal and Installation".)
NO >> Repair or replace malfunctioning part and then GO TO 11. H

11.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Start engine. I
2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.
Is the measurement value within the SP value? J
YES >> INSPECTION END
NO >> GO TO 12.
12.CHECK A/F SENSOR 1 FUNCTION K
Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
• For DTC P0130, P0150, refer to EC-218, "DTC Logic".
• For DTC P0131, P0151, refer to EC-222, "DTC Logic". L
• For DTC P0132, P0152, refer to EC-226, "DTC Logic".
• For DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, refer to EC-255, "DTC Logic".
• For DTC P2096, P2097, P2098, P2099, refer to EC-451, "DTC Logic".
M
Are any DTCs detected?
YES >> GO TO 15.
NO >> GO TO 13. N
13.CHECK A/F SENSOR 1 CIRCUIT
Perform Diagnostic Procedure according to corresponding DTC.
O
>> GO TO 14.
14.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2” P
1. Start engine.
2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 15.

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15.DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR

1. Stop the engine.
2. Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

>> GO TO 16.
16.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1. Start engine.
2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC-581, "Symptom Table".
17.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> INSPECTION END

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NO-1 >> More than the SP value: GO TO 18.
NO-2 >> Less than the SP value: GO TO 25.
18.DETECT MALFUNCTIONING PART
1. Check for the cause of large engine friction. Refer to the following.
- Engine oil level is too high
- Engine oil viscosity
- Belt tension of power steering, alternator, A/C compressor, etc. is excessive
- Noise from engine
- Noise from transmission, etc.
2. Check for the cause of insufficient combustion. Refer to the following.
- Valve clearance malfunction
- Intake valve timing control function malfunction
- Camshaft sprocket installation malfunction, etc.

>> Repair or replace malfunctioning part, and then GO TO 30.

19.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system
Is the inspection result normal?
YES >> GO TO 21.
NO >> Repair or replace malfunctioning part, and then GO TO 20.
20.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and
check that each indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> “B/FUEL SCHDL” is more, “A/F ALPHA-B1”, “A/F ALPHA-B2” are less than the SP value: GO TO
21.
21.DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
1. Stop the engine.

Revision: August 2013 EC-154 2014 Maxima NAM

 TROUBLE DIAGNOSIS - SPECIFICATION VALUE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again. A

>> GO TO 22.
22.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2” EC

1. Start engine.
2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
C
indication is within the SP value.
Is the measurement value within the SP value?
YES >> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-190, "Diagno- D
sis Procedure". Then GO TO 29.
NO >> GO TO 23.
23.CHECK “MAS A/F SE-B1” E
Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value? F
YES >> GO TO 24.
NO >> More than the SP value: Replace mass air flow sensor, and then GO TO 29. (Refer to EM-24.)

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24.REPLACE ECM G
1. Replace ECM.
2. Refer to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment". H

>> GO TO 29.
I
25.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
• Crushed air ducts J
• Malfunctioning seal in air cleaner element
• Uneven dirt in air cleaner element
• Improper specification in intake air system
K
Is the inspection result normal?
YES >> GO TO 27.
NO >> Repair or replace malfunctioning part, and then GO TO 26.
L
26.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value. M
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Less than the SP value: GO TO 27. N
27.CHECK “MAS A/F SE-B1”
Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP O
value.
Is the measurement value within the SP value?
YES >> GO TO 28. P
NO >> Less than the SP value: Replace mass air flow sensor, and then GO TO 30. (Refer to EM-24.)
28.CHECK INTAKE SYSTEM
Check for the cause of air leakage after the mass air flow sensor. Refer to the following.
• Disconnection, looseness, and cracks in air duct
• Looseness of oil filler cap
• Disconnection of oil level gauge
• Open stuck, breakage, hose disconnection, or cracks in PCV valve
Revision: August 2013 EC-155 2014 Maxima NAM
 TROUBLE DIAGNOSIS - SPECIFICATION VALUE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Disconnection or cracks in EVAP purge hose, stuck open EVAP canister purge volume control solenoid
valve
• Malfunctioning seal in rocker cover gasket
• Disconnection, looseness, or cracks in hoses, such as a vacuum hose, connecting to intake air system parts
• Malfunctioning seal in intake air system, etc.

>> GO TO 30.
29.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and
check that each indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC-581, "Symptom Table".
30.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and then check that the indication is within
the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END

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NO >> Detect malfunctioning part according to EC-581, "Symptom Table".

Revision: August 2013 EC-156 2014 Maxima NAM

 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
POWER SUPPLY AND GROUND CIRCUIT
A
Diagnosis Procedure INFOID:0000000010094858

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". EC

1.CHECK GROUND CONNECTION-I
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection". C
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection. D
2.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect ECM harness connector. E
2. Check the continuity between ECM harness connector and ground.

ECM F
Ground Continuity
Connector Terminal
12

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F14 G
16
107
Ground Existed
108 H
E10
111
112
3. Also check harness for short to power. I
is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3. J

3.DETECT MALFUNCTIONING PART

Check the following. K
• Harness connectors E11, F2
• Harness for open or short between ECM and ground
L
>> Repair open circuit, short to power in harness or connectors.
4.CHECK ECM POWER SUPPLY CIRCUIT-I
M
1. Reconnect ECM harness connector.
2. Turn ignition switch OFF and then ON.
3. Check the voltage between ECM harness connectors.
N
ECM
+ – Voltage
Connector O
Terminal Terminal
E10 93 112 Battery voltage
Is the inspection result normal? P
YES >> GO TO 6.
NO >> GO TO 5. JMBIA1875ZZ

5.DETECT MALFUNCTIONING PART

Check the following.
• IPDM E/R connector E18
• 10 A fuse (No. 35)
Revision: August 2013 EC-157 2014 Maxima NAM
 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Harness for open or short between ECM and fuse

>> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK ECM POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Check the voltage between ECM harness connectors.

ECM
+ – Voltage
Connector
Terminal Terminal
After turning ignition switch OFF, battery
E10 105 112 voltage will exist for a few seconds, then
drop to approximately 0 V.
Is the inspection result normal?
JMBIA1876ZZ
YES >> GO TO 7.
NO >> GO TO 9.
7.CHECK ECM POWER SUPPLY CIRCUIT-III

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1. Turn ignition switch ON.
2. Check the voltage between IPDM E/R harness connector and
ground.

IPDM E/R
Ground Voltage
Connector Terminal
49
F10 Ground Battery voltage
53
Is the inspection result normal?
YES >> GO TO 8. JMBIA1842ZZ
NO >> Replace IPDM E/R. Refer to PCS-35.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

9.CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Check the voltage between ECM harness connectors.

ECM
+ – Voltage
Connector Terminal Connector Terminal
F14 24 E10 112 Battery voltage
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 10. JMBIA1877ZZ

10.CHECK ECM POWER SUPPLY CIRCUIT-V

1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

Revision: August 2013 EC-158 2014 Maxima NAM

 POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ECM IPDM E/R A

Continuity
Connector Terminal Connector Terminal
F14 24 F10 69 Existed
EC
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 11. C
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
11.CHECK 15 A FUSE
D
1. Disconnect 15 A fuse (No. 42) from IPDM E/R.
2. Check 15 A fuse.
Is the inspection result normal?
E
YES >> GO TO 14.
NO >> Replace 15 A fuse.
12.CHECK ECM POWER SUPPLY CIRCUIT-VI F
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.

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3. Check the continuity between ECM harness connector and IPDM E/R harness connector. G

ECM IPDM E/R

Continuity
Connector Terminal Connector Terminal H
E10 105 E18 10 Existed
4. Also check harness for short to ground and short to power.
I
Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13.
J
13.DETECT MALFUNCTIONING PART
Check the following.
• Junction block connectors E44, E45 K
• Harness for open or short between ECM and IPDM E/R

>> Repair open circuit, short to ground or short to power in harness or connectors. L
14.CHECK INTERMITTENT INCIDENT
Refer toGI-41, "Intermittent Incident" GI-41. M
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35.
NO >> Repair or replace harness or connectors. N

Revision: August 2013 EC-159 2014 Maxima NAM

 U0101 CAN COMM CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
U0101 CAN COMM CIRCUIT
Description INFOID:0000000010094859

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
DTC Logic INFOID:0000000010094860

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• CAN communication line between
When ECM is not transmitting or receiving CAN
Lost communication TCM and ECM
U0101 communication signal from OBD (emission-related
with TCM • CAN communication line open or
diagnosis) with TCM for 2 seconds or more.
shorted

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DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 3 seconds.
2. Check DTC.
Is DTC detected?
YES >> EC-160, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094861

Go to LAN-15, "Trouble Diagnosis Flow Chart".

Revision: August 2013 EC-160 2014 Maxima NAM

 U1001 CAN COMM CIRCUIT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
U1001 CAN COMM CIRCUIT
A
Description INFOID:0000000010094862

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul- EC
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. C
Each control unit transmits/receives data but selectively reads required data only.
DTC Logic INFOID:0000000010094863
D

DTC DETECTION LOGIC

E
Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name
When ECM is not transmitting or receiving CAN com- • Harness or connectors
CAN communication F
U1001 munication signal other than OBD (emission-related (CAN communication line is open or
line
diagnosis) for 2 seconds or more. shorted)

cardiagn.com
DTC CONFIRMATION PROCEDURE G
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 3 seconds. H
2. Check DTC.
Is DTC detected?
YES >> EC-161, "Diagnosis Procedure". I
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094864

J
Go to LAN-15, "Trouble Diagnosis Flow Chart".

Revision: August 2013 EC-161 2014 Maxima NAM

 P0011, P0021 IVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0011, P0021 IVT CONTROL
DTC Logic INFOID:0000000010094865

DTC DETECTION LOGIC

NOTE:
If DTC P0011 or P0021 is displayed with DTC P0075, P0081, first perform the trouble diagnosis for DTC
P0075, P0081. Refer to EC-177, "DTC Logic".

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name
Intake valve timing • Crankshaft position sensor (POS)
P0011 control performance • Camshaft position sensor (PHASE)
(bank 1) • Intake valve timing control solenoid valve
There is a gap between angle of target and • Accumulation of debris to the signal pick-up
Intake valve timing phase-control angle degree. portion of the camshaft
P0021 control performance • Timing chain installation
(bank 2) • Foreign matter caught in the oil groove for in-
take valve timing control

DTC CONFIRMATION PROCEDURE

cardiagn.com
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10 V and 16 V at
idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Maintain the following conditions for at least 6 consecutive seconds. Hold the accelerator pedal as steady
as possible.

VHCL SPEED SE 100 - 120 km/h (63 - 75 mph)

ENG SPEED 1,200 - 2,000 rpm
COOLAN TEMP/S More than 60°C (140°F)
B/FUEL SCHDL More than 7.3 msec
Selector lever D position
CAUTION:
Always drive at a safe speed.
4. Stop vehicle with engine running and let engine idle for 10 seconds.
5. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-163, "Diagnosis Procedure"
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
Revision: August 2013 EC-162 2014 Maxima NAM
 P0011, P0021 IVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
With CONSULT
1. Maintain the following conditions for at least 20 consecutive seconds. A

ENG SPEED 1,400 - 3,175 rpm (A constant rotation is maintained.)

COOLAN TEMP/S More than 70°C (158°F)
EC

Selector lever 1st or 2nd position

Driving vehicle uphill
C
Driving location uphill (Increased engine load will help maintain the driving conditions re-
quired for this test.)
CAUTION:
D
Always drive at a safe speed.
2. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above. E
Is 1st trip DTC detected?
YES >> Go to EC-163, "Diagnosis Procedure"
NO >> INSPECTION END F

Diagnosis Procedure INFOID:0000000010094866

cardiagn.com
1.CHECK OIL PRESSURE WARNING LAMP G

1. Start engine.
2. Check oil pressure warning lamp and confirm it is not illumi- H
nated.
Is oil pressure warming lamp illuminated?
YES >> Go to LU-8, "Inspection". I
NO >> GO TO 2.

PBIA8559J K
2.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-164, "Component Inspection".
L
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace malfunctioning intake valve timing control solenoid valve. Refer to EM-37, "Removal and
Installation (Upper Oil Pan)". M

3.CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to EC-299, "Component Inspection". N
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace crankshaft position sensor (POS). Refer to EM-37, "Removal and Installation (Upper Oil O
Pan)".
4.CHECK CAMSHAFT POSITION SENSOR (PHASE)
P
Refer to EC-302, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace malfunctioning camshaft position sensor (PHASE). Refer to EM-48, "Removal and Instal-
lation (LH)" (LH) or EM-49, "Removal and Installation (RH)" (RH).
5.CHECK CAMSHAFT (INTAKE)
Revision: August 2013 EC-163 2014 Maxima NAM
 P0011, P0021 IVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check the following.
• Accumulation of debris on the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES >> GO TO 6.
NO >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft. Refer to EM-76.

JMBIA0058ZZ

6.CHECK TIMING CHAIN INSTALLATION

Check service records for any recent repairs that may cause timing chain misalignment.
Are there any service records that may cause timing chain misalignment?
YES >> Check timing chain installation. Refer to EM-64.
NO >> GO TO 7.
7.CHECK LUBRICATION CIRCUIT
Refer to LU-8, "Inspection".

cardiagn.com
Is the inspection result normal?
YES >> GO TO 8.
NO >> Clean lubrication line.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094867

1.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE-I

1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid
valve terminals as per the following.

Terminals Resistance
1 and 2 7.0 - 7.5 Ω [at 20°C (68°F)]
∞Ω
1 or 2 and ground
(Continuity should not exist)
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace malfunctioning intake valve timing control sole- PBIB0193E

noid valve. Refer to EM-54, "Exploded View".

2.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE-II
1. Remove intake valve timing control solenoid valve. Refer to EM-54, "Exploded View".

Revision: August 2013 EC-164 2014 Maxima NAM

 P0011, P0021 IVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Provide 12 V DC between intake valve timing control solenoid
valve terminals 1 and 2, and then interrupt it. Check that the A
plunger moves as shown in the figure.
CAUTION:
Never apply 12 V DC continuously for 5 seconds or more.
EC
Doing so may result in damage to the coil in intake valve
timing control solenoid valve.
NOTE:
Always replace O-ring when intake valve timing control C
solenoid valve is removed.
Is the inspection result normal? JMBIA0079ZZ

YES >> INSPECTION END D

NO >> Replace malfunctioning intake valve timing control solenoid valve. Refer to EM-54, "Exploded
View".
E

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G

Revision: August 2013 EC-165 2014 Maxima NAM

 P0014, P0024 EVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0014, P0024 EVT CONTROL
DTC Logic INFOID:0000000010094868

DTC DETECTION LOGIC

NOTE:
• If DTC P0014 or P0024 is displayed with DTC P0078, P0084 first perform trouble diagnosis for DTC
P0078, P0084. Refer to EC-180, "DTC Logic".
• If DTC P0014 or P0024 is displayed with DTC P1078, P1084 first perform trouble diagnosis for DTC
P1078, P1084. Refer to EC-400, "DTC Logic".

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name
Exhaust valve timing • Crankshaft position sensor
P0014 (EVT) control perfor- • Camshaft position sensor
mance (bank 1) • EVT control position sensor
There is a gap between angle of target and • EVT control magnet retarder
Exhaust valve timing phase-control angle degree. • Accumulation of debris to the signal pick-up
P0024 (EVT) control perfor- portion of the camshaft
mance (bank 2) • Timing chain installation
• EVT control pulley assembly

cardiagn.com
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10 V and 16 V at
idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Maintain the following conditions for at least 6 consecutive seconds.Hold the accelerator pedal as steady
as possible.

ENG SPEED 1,200 - 2,000 rpm (A constant rotation is maintained.)

COOLAN TEMP/S More than 60°C (140°F)
Selector lever P or N position
4. Let engine idle for 10 seconds.
5. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-167, "Diagnosis Procedure"
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1. Select “DATA MONITOR” mode with CONSULT.
2. Maintain the following conditions for at least 20 consecutive seconds.
Revision: August 2013 EC-166 2014 Maxima NAM
 P0014, P0024 EVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ENG SPEED 1,400 - 2,950 rpm (A constant rotation is maintained.) A

COOLAN TEMP/S More than 70°C (158°F)
Selector lever 1st or 2nd position
EC
Driving vehicle uphill
Driving location uphill (Increased engine load will help maintain the driving
conditions required for this test.)
C
CAUTION:
Always drive vehicle at a safe speed.
3. Check 1st trip DTC.
With GST D
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-167, "Diagnosis Procedure" E
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094869
F
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK FUNCTION OF EXHAUST VALVE TIMING (EVT) CONTROL

cardiagn.com
G
With CONSULT
1. Turn ignition switch ON.
2. Select “EXH V/T ASSIGN ANGLE” in “ACTIVE TEST” mode with CONSULT. H
3. Start engine and keep the engine speed at 2,500 rpm, then touch “START”.
4. Check that the values of “EXH/V TIM B1” and “EXH/V TIM B2” change when touching “UP” or “DOWN”.
Without CONSULT
I
1. Start engine and rev engine up above 1,500 rpm.
2. Read the voltage signal between ECM harness connector terminals as per the following with an oscillo-
scope.
J
ECM
+ – Voltage signal
K
Connector Terminal Connector Terminal
79
[EVT control magnet re-
L
tarder (bank 1) signal]

F13 E10 112

80
[EVT control magnet re- M
tarder (bank 2) signal]
JMBIA0034GB

Is the inspection result normal? N

YES >> GO TO 10.
NO >> GO TO 2.
2.CHECK EVT CONTROL MAGNET RETARDER O

Refer to EC-168, "Component Inspection".

Is the inspection result normal? P
YES >> GO TO 4.
NO >> GO TO 3.
3.REPLACE EVT CONTROL MAGNET RETARDER
1. Replace malfunctioning EVT control magnet retarder. Refer to EM-54, "Removal and Installation".
2. Perform EC-23, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement".

Revision: August 2013 EC-167 2014 Maxima NAM

 P0014, P0024 EVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> INSPECTION END
4.CHECK EVT CONTROL POSITION SENSOR
Refer to EC-402, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace malfunctioning EVT control position sensor. Refer to EM-48, "Exploded View".
5.CHECK CRANKSHAFT POSITION SENSOR
Refer to EC-299, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace crankshaft position sensor. Refer to EM-37, "Removal and Installation (Upper Oil Pan)".
6.CHECK CAMSHAFT POSITION SENSOR
Refer to EM-37, "Removal and Installation (Upper Oil Pan)".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace malfunctioning camshaft position sensor. Refer to EM-48, "Exploded View".
7.CHECK CAMSHAFT (EXH)

cardiagn.com
Check the following.
• Accumulation of debris to the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES >> GO TO 8.
NO >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft. Refer to EM-76.

JMBIA0059ZZ

8.CHECK TIMING CHAIN INSTALLATION

Check service records for any recent repairs that may cause timing chain misalignment.
Are there any service records that may cause timing chain misalignment?
YES >> Check timing chain installation. Refer to EM-64, "Removal and Installation".
NO >> GO TO 9.
9.REPLACE EVT CONTROL PULLEY ASSEMBLY
1. Replace camshaft sprocket (EXH) and EVT control magnet retarder.
Refer to EM-64, "Removal and Installation" and EM-54, "Removal and Installation".
2. Perform EC-23, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement".

>> INSPECTION END

10.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094870

1.CHECK EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

1. Turn ignition switch OFF.
2. Disconnect exhaust valve timing control magnet retarder harness connector.

Revision: August 2013 EC-168 2014 Maxima NAM

 P0014, P0024 EVT CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check resistance between exhaust valve timing control magnet
retarder terminals as per the following. A

Terminals Resistance
1 and 2 9.0 - 11.0 Ω [at 20°C (68°F)] EC
Is the inspection result normal?
YES >> INSPECTION END
C
NO >> GO TO 2.

PBIB3469E

2.REPLACE EXHAUST VALVE TIMING CONTROL MAGNET RETARDER D

1. Replace malfunctioning exhaust valve timing control magnet retarder. Refer to EM-54, "Removal and
Installation".
E
2. Perform EC-23, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement".

>> INSPECTION END

F

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G

Revision: August 2013 EC-169 2014 Maxima NAM

 P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
Description INFOID:0000000010094871

SYSTEM DESCRIPTION

Sensor Input Signal to ECM ECM function Actuator

Camshaft position sensor (PHASE)
Engine speed Air fuel ratio (A/F) sensor 1 Air fuel ratio (A/F) sensor 1
Crankshaft position sensor (POS)
heater control heater
Mass air flow sensor Amount of intake air
The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element within the specified range.
DTC Logic INFOID:0000000010094872

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
The current amperage in the A/F sensor 1 heater • Harness or connectors
Air fuel ratio (A/F) sensor

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circuit is out of the normal range. (The A/F sensor 1 heater circuit is
P0031 1 heater (bank 1) control
(An excessively low voltage signal is sent to ECM open or shorted.)
circuit low
via the A/F sensor 1 heater.) • A/F sensor 1 heater
The current amperage in the A/F sensor 1 heater • Harness or connectors
Air fuel ratio (A/F) sensor
circuit is out of the normal range. (The A/F sensor 1 heater circuit is
P0032 1 heater (bank 1) control
(An excessively high voltage signal is sent to ECM shorted.)
circuit high
via the A/F sensor 1 heater.) • A/F sensor 1 heater
The current amperage in the A/F sensor 1 heater • Harness or connectors
Air fuel ratio (A/F) sensor
circuit is out of the normal range. (The A/F sensor 1 heater circuit is
P0051 1 heater (bank 2) control
(An excessively low voltage signal is sent to ECM open or shorted.)
circuit low
via the A/F sensor 1 heater.) • A/F sensor 1 heater
The current amperage in the A/F sensor 1 heater • Harness or connectors
Air fuel ratio (A/F) sensor
circuit is out of the normal range. (The A/F sensor 1 heater circuit is
P0052 1 heater (bank 2) control
(An excessively high voltage signal is sent to ECM shorted.)
circuit high
via the A/F sensor 1 heater.) • A/F sensor 1 heater

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-170, "Diagnosis Procedure".
NG >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094873

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

Revision: August 2013 EC-170 2014 Maxima NAM

 P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

1.CHECK GROUND CONNECTION A

1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal? EC
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT C
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and D
ground.

A/F sensor 1 E
DTC Ground Voltage
Bank Connector Terminal
P0031, P0032 1 F12 4
Ground Battery voltage F
P0051, P0052 2 F61 4
Is the inspection result normal?

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YES >> GO TO 4. PBIB3308E G
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
H
Check the following.
• IPDM E/R harness connector F10
• 15 A fuse (No. 37)
• Harness for open or short between A/F sensor 1 and fuse I

>> Repair or replace harness or connectors.

4.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT J

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector. K
3. Check harness continuity between A/F sensor 1 harness connector and ECM harness connector.

A/F sensor 1 ECM

DTC Continuity L
Bank Connector Terminal Connector Terminal
P0031, P0032 1 F12 3 4
F14 Existed
P0051, P0052 2 F61 3 8 M
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
N
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK A/F SENSOR 1 HEATER O
Refer to EC-172, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7. P
NO >> GO TO 6.
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation (LH)" or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:

Revision: August 2013 EC-171 2014 Maxima NAM

 P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

7.CHECK INTERMITTENT INCIDENT
Perform GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094874

1.CHECK AIR FUEL RATIO (A/F) SENSOR 1

Check resistance between A/F sensor terminals as per the following.

Terminal No. Resistance

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3 and 4 1.8 - 2.44 Ω [at 25°C (77°F)]
3 and 1, 2 ∞Ω
4 and 1, 2 (Continuity should not exist)

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 2.

PBIB3309E

2.REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any (A/F) sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
• Before installing new (A/F) sensor, clean exhaust system threads using Heated Oxygen Sensor
Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubri-
cant (commercial service tool).

>> INSPECTION END

Revision: August 2013 EC-172 2014 Maxima NAM

 P0037, P0038, P0057, P0058 HO2S2 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0037, P0038, P0057, P0058 HO2S2 HEATER
A
Description INFOID:0000000010094875

SYSTEM DESCRIPTION EC

Sensor Input signal to ECM ECM function Actuator

Camshaft position sensor (PHASE) C
Engine speed
Crankshaft position sensor (POS)
Heated oxygen sensor 2
Heated oxygen sensor 2 heater
Engine coolant temperature sensor Engine coolant temperature heater control
Mass air flow sensor Amount of intake air D
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
E
OPERATION

Engine speed Heated oxygen sensor 2 heater

F
Above 3,600 rpm OFF
Below 3,600 rpm after the following conditions are met.

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• Engine: After warming up G
ON
• Keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no load

DTC Logic INFOID:0000000010094876 H

DTC DETECTION LOGIC

I
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
The current amperage in the heated oxygen sensor • Harness or connectors
Heated oxygen sensor 2
2 heater circuit is out of the normal range. (The heated oxygen sensor 2 heater J
P0037 heater (bank 1) control
(An excessively low voltage signal is sent to ECM circuit is open or shorted.)
circuit low
via the heated oxygen sensor 2 heater.) • Heated oxygen sensor 2 heater
The current amperage in the heated oxygen sensor • Harness or connectors
Heated oxygen sensor 2 K
2 heater circuit is out of the normal range. (The heated oxygen sensor 2 heater
P0038 heater (bank 1) control
(An excessively high voltage signal is sent to ECM circuit is shorted.)
circuit high
via the heated oxygen sensor 2 heater.) • Heated oxygen sensor 2 heater
The current amperage in the heated oxygen sensor • Harness or connectors L
Heated oxygen sensor 2
2 heater circuit is out of the normal range. (The heated oxygen sensor 2 heater
P0057 heater (bank 2) control
(An excessively low voltage signal is sent to ECM circuit is open or shorted.)
circuit low
via the heated oxygen sensor 2 heater.) • Heated oxygen sensor 2 heater
M
The current amperage in the heated oxygen sensor • Harness or connectors
Heated oxygen sensor 2
2 heater circuit is out of the normal range. (The heated oxygen sensor 2 heater
P0058 heater (bank 2) control
(An excessively high voltage signal is sent to ECM circuit is shorted.)
circuit high
via the heated oxygen sensor 2 heater.) • Heated oxygen sensor 2 heater N

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING O
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. P
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 11 V at idle.

>> GO TO 2.

Revision: August 2013 EC-173 2014 Maxima NAM

 P0037, P0038, P0057, P0058 HO2S2 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st tip DTC detected?
YES >> Go to EC-174, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094877

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION

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1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
2. Turn ignition switch ON.
3. Check the voltage between HO2S2 harness connector and
ground.

HO2S2
DTC Ground Voltage
Bank Connector Terminal
P0037, P0038 1 F62 2
Ground Battery voltage
P0057, P0058 2 F56 2
Is the inspection result normal?
YES >> GO TO 4. MBIB0186E
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R connector F10
• 15 A fuse (No. 37)
• Harness for open or short between heated oxygen sensor 2 and fuse

>> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between HO2S2 harness connector and ECM harness connector.

Revision: August 2013 EC-174 2014 Maxima NAM

 P0037, P0038, P0057, P0058 HO2S2 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

HO2S2 ECM A
DTC Continuity
Bank Connector Terminal Connector Terminal
P0037, P0038 1 F62 3 13
F14 Existed EC
P0057, P0058 2 F56 3 17
4. Also check harness for short to ground and short to power.
Is the inspection result normal? C
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK HEATED OXYGEN SENSOR 2 HEATER D

Refer to EC-175, "Component Inspection".

Is the inspection result normal? E
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2 F
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).

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CAUTION: G
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread H
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

I
>> INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". J

>> INSPECTION END

K
Component Inspection INFOID:0000000010094878

1.CHECK HEATED OXYGEN SENSOR 2 HEATER L

Revision: August 2013 EC-175 2014 Maxima NAM

 P0037, P0038, P0057, P0058 HO2S2 HEATER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check resistance between HO2S2 terminals as per the following.

Terminal No. Resistance

2 and 3 3.4 - 4.4 Ω [at 25°C (77°F)]
1 and 2, 3, 4 ∞Ω
4 and 1, 2, 3 (Continuity should not exist)

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 2.

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PBIB3310E

2.REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

Revision: August 2013 EC-176 2014 Maxima NAM

 P0075, P0081 IVT CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0075, P0081 IVT CONTROL SOLENOID VALVE
A
Description INFOID:0000000010094879

Intake valve timing control solenoid valve is activated by ON/OFF EC

pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow via the intake valve timing control unit
or stops oil flow. C
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve D
stops oil pressure flow to fix the intake valve angle at the control
position.
PBIB1842E E
DTC Logic INFOID:0000000010094880

DTC DETECTION LOGIC F

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
G
Intake valve timing control so- • Harness or connectors
P0075 An improper voltage is sent to the ECM via
lenoid valve (bank 1) circuit (Intake valve timing control solenoid valve
the intake valve timing control solenoid
Intake valve timing control so- circuit is open or shorted.)
P0081 valve. H
lenoid valve (bank 2) circuit • Intake valve timing control solenoid valve

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING I

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. J
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
K
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE L
1. Start engine and let it idle for 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected? M
YES >> Go to EC-177, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094881
N

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT O
1. Turn ignition switch OFF.
2. Disconnect intake valve timing control solenoid valve harness connector.
3. Turn ignition switch ON. P

Revision: August 2013 EC-177 2014 Maxima NAM

 P0075, P0081 IVT CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check the voltage between intake valve timing (IVT) control
solenoid valve harness connector and ground with CONSULT or
tester.

IVT control solenoid valve

DTC Ground Voltage
Bank Connector Terminal
P0075 1 F67 2
Ground Battery voltage
P0081 2 F66 2
Is the inspection result normal?
PBIB0192E
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN
AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between intake valve timing control solenoid valve harness connector and ECM har-
ness connector.

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IVT control solenoid valve ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
P0075 1 F67 1 78
F13 Existed
P0081 2 F66 1 75
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-175, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace malfunctioning intake valve timing control solenoid valve. Refer to EM-54, "Exploded
View".
4.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094882

1.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE-I

1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid
valve terminals as per the following.

Terminals Resistance
1 and 2 7.0 - 7.5 Ω [at 20°C (68°F)]
∞Ω
1 or 2 and ground
(Continuity should not exist)
Is the inspection result normal?
YES >> GO TO 2.
PBIB0193E

Revision: August 2013 EC-178 2014 Maxima NAM

 P0075, P0081 IVT CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Replace malfunctioning intake valve timing control solenoid valve. Refer to EM-54, "Exploded
View". A
2.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE-II
1. Remove intake valve timing control solenoid valve. Refer to EM-54, "Exploded View".
EC
2. Provide 12 V DC between intake valve timing control solenoid
valve terminals 1 and 2, and then interrupt it. Check that the
plunger moves as shown in the figure.
CAUTION: C
Never apply 12 V DC continuously for 5 seconds or more.
Doing so may result in damage to the coil in intake valve
timing control solenoid valve.
D
NOTE:
Always replace O-ring when intake valve timing control
solenoid valve is removed.
Is the inspection result normal? E
JMBIA0079ZZ

YES >> INSPECTION END

NO >> Replace malfunctioning intake valve timing control solenoid valve. Refer to EM-54, "Exploded
View". F

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G

Revision: August 2013 EC-179 2014 Maxima NAM

 P0078, P0084 EVT CONTROL MAGNET RETARDER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0078, P0084 EVT CONTROL MAGNET RETARDER
Description INFOID:0000000010094883

Exhaust valve timing control magnet retarder (1) controls the shut/
open timing of the exhaust valve by ON/OFF pulse duty signals sent
from the ECM.
The longer pulse width retards valve timing.
The shorter pulse width advances valve timing.

JMBIA0024ZZ

DTC Logic INFOID:0000000010094884

DTC DETECTION LOGIC

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Exhaust valve timing control • Harness or connectors
P0078
magnet retarder (bank 1) circuit An improper voltage is sent to the ECM via (Exhaust valve timing control magnet
the exhaust valve timing control magnet re- retarder circuit is open or shorted.)
Exhaust valve timing control tarder. • Exhaust valve timing control magnet re-
P0084
magnet retarder (bank 2) circuit tarder

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-180, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094885

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK EXHAUST VALVE TIMING (EVT) CONTROL MAGNET RETARDER POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EVT control magnet retarder harness connector.
3. Turn ignition switch ON.

Revision: August 2013 EC-180 2014 Maxima NAM

 P0078, P0084 EVT CONTROL MAGNET RETARDER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check the voltage between EVT control magnet retarder har-
ness connector and ground. A

EVT control magnet retarder

DTC Ground Voltage
Bank Connector Terminal EC
P0078 1 F32 1
Ground Battery voltage
P0084 2 F33 1
C
Is the inspection result normal?
YES >> GO TO 2. PBIB3468E
NO >> Repair open circuit, short to ground or short to power in D
harness or connectors.
2.CHECK EVT CONTROL MAGNET RETARDER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. E
2. Disconnect ECM harness connector.
3. Check the continuity between EVT control magnet retarder harness connector and ECM harness connec-
tor. F

EVT control magnet retarder ECM

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DTC Continuity
Bank Connector Terminal Connector Terminal G
P0078 1 F32 2 79
F13 Existed
P0084 2 F33 2 80
H
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3. I
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK EVT CONTROL MAGNET RETARDER
J
Refer to EC-168, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 4. K
NO >> GO TO 5.
4.REPLACE EVT CONTROL MAGNET RETARDER
1. Replace malfunctioning EVT control magnet retarder. Refer to .EM-54, "Removal and Installation" L
2. Perform EC-23, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement".

>> INSPECTION END M

5.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". N

>> INSPECTION END

O
Component Inspection INFOID:0000000010094886

1.CHECK EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

P
1. Turn ignition switch OFF.
2. Disconnect exhaust valve timing control magnet retarder harness connector.

Revision: August 2013 EC-181 2014 Maxima NAM

 P0078, P0084 EVT CONTROL MAGNET RETARDER
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check resistance between exhaust valve timing control magnet
retarder terminals as per the following.

Terminals Resistance
1 and 2 9.0 - 11.0 Ω [at 20°C (68°F)]
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.

PBIB3469E

2.REPLACE EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

1. Replace malfunctioning exhaust valve timing control magnet retarder. Refer to EM-54, "Removal and
Installation".
2. Perform EC-23, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement".

>> INSPECTION END

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Revision: August 2013 EC-182 2014 Maxima NAM

 P0101 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0101 MAF SENSOR
A
Description INFOID:0000000010094887

The mass air flow sensor (1) is placed in the stream of intake air. It EC
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The greater air flow, the C
greater the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The D
ECM detects the air flow by means of this current change.

PBIA9559J E
DTC Logic INFOID:0000000010094888

DTC DETECTION LOGIC F

NOTE:
If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

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G
Trouble diagnosis
DTC No. DTC detecting condition Possible cause
(Trouble diagnosis content)
• Harness or connectors H
(The sensor circuit is open or short-
• A high voltage from the sensor is sent to
MAF SEN/CIRCUIT-B1 ed.)
ECM under light load driving condition.
P0101 [Mass air flow (MAF) sensor cir- • Intake air leaks
cuit range/performance]
• A low voltage from the sensor is sent to
• MAF sensor I
ECM under heavy load driving condition.
• EVAP control system pressure sensor
• Intake air temperature sensor
J
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce- K
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. L
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2. M
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle for at least 5 seconds under the following conditions: N
CAUTION:
Always drive vehicle at safe speed.
O
Selector lever Suitable position
Vehicle speed 40 km/h (25 MPH) or more
P
NOTE:
• The gear must be fixed while driving the vehicle.
• Keep the accelerator pedal as steady as possible during cruising.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-184, "Diagnosis Procedure".
NO >> INSPECTION END

Revision: August 2013 EC-183 2014 Maxima NAM

 P0101 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010094889

1.CHECK INTAKE SYSTEM

Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct and intake manifold
Is the inspection result normal?
YES >> GO TO 2.
NO >> Reconnect the parts.
2.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace ground connection.
3.CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY CIRCUIT
1. Disconnect MAF sensor harness connector.

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2. Turn ignition switch ON.
3. Check the voltage between MAF sensor harness connector and
ground.

MAF sensor
Ground Voltage
Connector Terminal
F31 2 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
PBIB1168E

4.DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E11, F2
• Junction block connectors E44, E45
• Harness for open or short between mass air flow sensor and ECM
• Harness for open or short between mass air flow sensor and IPDM E/R

>> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between MAF sensor harness connector and ECM harness connector.

MAF sensor ECM

Continuity
Connector Terminal Connector Terminal
F31 3 F13 56 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Revision: August 2013 EC-184 2014 Maxima NAM
 P0101 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Check the continuity between MAF sensor harness connector and ECM harness connector.
A
MAF sensor ECM
Continuity
Connector Terminal Connector Terminal
EC
F31 4 F13 58 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal? C
YES >> GO TO 7.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK INTAKE AIR TEMPERATURE SENSOR D
Check intake air temperature sensor. Refer to EC-185, "Component Inspection".
Is the inspection result normal?
E
YES >> GO TO 8.
NO >> Replace MAF sensor (with intake air temperature sensor). Refer to EM-24, "Removal and Installa-
tion".
F
8.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check EVAP control system pressure sensor. Refer to EC-346, "Component Inspection".

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Is the inspection result normal? G
YES >> GO TO 9.
NO >> Replace EVAP control system pressure sensor.
9.CHECK MAF SENSOR H

Check MAF sensor. Refer to EC-185, "Component Inspection".

Is the inspection result normal? I
YES >> GO TO 10.
NO >> Replace MAF sensor. Refer to EM-24, "Removal and Installation".
10.CHECK INTERMITTENT INCIDENT J
Check intermittent incident. Refer to GI-41, "Intermittent Incident".

K
>> INSPECTION END
Component Inspection INFOID:0000000010094890

L
1.CHECK MASS AIR FLOW SENSOR-I
With CONSULT
1. Reconnect all harness connectors disconnected. M
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT and select “DATA MONITOR” mode.
4. Select “MAS A/F SE-B1” and check indication under the following conditions. N

Monitor item Condition MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.) Approx. 0.4 O
Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2
MAS A/F SE-B1
2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9
P
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.

Revision: August 2013 EC-185 2014 Maxima NAM

 P0101 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM harness connector terminals
under the following conditions.

ECM

Con- + – Condition Voltage (V)

nector Terminal Terminal
Ignition switch ON (Engine
Approx. 0.4
stopped.)

58 Idle (Engine is warmed-up to normal

56 0.9 - 1.2
(MAF operating temperature.) JMBIA1862ZZ
F13 (Sensor
sensor 2,500 rpm (Engine is warmed-up to
ground) 1.6 - 1.9
signal) normal operating temperature.)
0.9 - 1.2 to
Idle to about 4,000 rpm
Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK FOR THE CAUSE OF UNEVEN AIR FLOW VIA THE MASS AIR FLOW SENSOR

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Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system parts
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK MASS AIR FLOW SENSOR-II
With CONSULT
1. Repair or replace malfunctioning part.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT and select “DATA MONITOR” mode.
4. Select “MAS A/F SE-B1” and check indication under the following conditions.

Monitor item Condition MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2
MAS A/F SE-B1
2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
1. Repair or replace malfunctioning part.
2. Start engine and warm it up to normal operating temperature.

Revision: August 2013 EC-186 2014 Maxima NAM

 P0101 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM harness connector terminals
under the following conditions. A

ECM
+ – Condition Voltage (V) EC
Con-
nector Terminal Terminal
Ignition switch ON (Engine
stopped.)
Approx. 0.4 C

58 Idle (Engine is warmed-up to normal

56 0.9 - 1.2
(MAF operating temperature.) JMBIA1862ZZ
F13
sensor
(Sensor D
ground) 2,500 rpm (Engine is warmed-up to
signal) 1.6 - 1.9
normal operating temperature.)
0.9 - 1.2 to
Idle to about 4,000 rpm E
Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal?
F
YES >> INSPECTION END
NO >> GO TO 4.
4.CHECK MASS AIR FLOW SENSOR-III

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G
With CONSULT
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again. H
3. Start engine and warm it up to normal operating temperature.
4. Connect CONSULT and select “DATA MONITOR” mode.
5. Select “MAS A/F SE-B1” and check indication under the following conditions.
I

Monitor item Condition MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.) Approx. 0.4 J
Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2
MAS A/F SE-B1
2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9
K
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT L
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again.
3. Start engine and warm it up to normal operating temperature.
4. Check the voltage between ECM harness connector terminals M
under the following conditions.

ECM N
Con- + – Condition Voltage (V)
nector Terminal Terminal
O
Ignition switch ON (Engine
Approx. 0.4
stopped.)

58 Idle (Engine is warmed-up to normal

56 operating temperature.)
0.9 - 1.2 JMBIA1862ZZ P
(MAF
F13 (Sensor
sensor 2,500 rpm (Engine is warmed-up to
ground) 1.6 - 1.9
signal) normal operating temperature.)
0.9 - 1.2 to
Idle to about 4,000 rpm
Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal?
Revision: August 2013 EC-187 2014 Maxima NAM
 P0101 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> INSPECTION END
NO >> Clean or replace mass air flow sensor. Refer to EM-24, "Removal and Installation".

cardiagn.com

Revision: August 2013 EC-188 2014 Maxima NAM

 P0102, P0103 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0102, P0103 MAF SENSOR
A
Description INFOID:0000000010094891

The mass air flow sensor (1) is placed in the stream of intake air. It EC
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The greater air flow, the C
greater the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The D
ECM detects the air flow by means of this current change.

PBIA9559J E
DTC Logic INFOID:0000000010094892

DTC DETECTION LOGIC F

Trouble diagnosis

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DTC No. DTC detecting condition Possible cause
name G
• Harness or connectors
Mass air flow sensor An excessively low voltage from the sensor is sent (The sensor circuit is open or shorted.)
P0102
circuit low input to ECM. • Intake air leakage H
• Mass air flow sensor
• Harness or connectors
Mass air flow sensor An excessively high voltage from the sensor is
P0103 (The sensor circuit is open or shorted.)
circuit high input sent to ECM. I
• Mass air flow sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING J
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. K
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Which DTC is detected? L
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0102 M

1. Start engine and wait at least 5 seconds.

2. Check DTC.
N
Is DTC detected?
YES >> Go to EC-190, "Diagnosis Procedure".
NO >> INSPECTION END
O
3.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-I
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check DTC. P
Is DTC detected?
YES >> Go to EC-190, "Diagnosis Procedure".
NO >> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-II
1. Start engine and wait at least 5 seconds.
2. Check DTC.

Revision: August 2013 EC-189 2014 Maxima NAM

 P0102, P0103 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is DTC detected?
YES >> Go to EC-190, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094893

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.INSPECTION START
Confirm the detected DTC.
Which DTC is detected?
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2.CHECK INTAKE SYSTEM
Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct to intake manifold
Is the inspection result normal?
YES >> GO TO 3.

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NO >> Reconnect the parts.
3.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace ground connection.
4.CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between MAF sensor harness connector and
ground.

MAF sensor
Ground Voltage
Connector Terminal
F31 2 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
PBIB1168E

5.DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E11, F2
• Junction block connectors E44, E45
• Harness for open or short between mass air flow sensor and ECM
• Harness for open or short between mass air flow sensor and IPDM E/R

>> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between MAF sensor harness connector and ECM harness connector.

Revision: August 2013 EC-190 2014 Maxima NAM

 P0102, P0103 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

MAF sensor ECM A

Continuity
Connector Terminal Connector Terminal
F31 3 F13 56 Existed
EC
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7. C
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
D
1. Check the continuity between MAF sensor harness connector and ECM harness connector.

MAF sensor ECM

Continuity E
Connector Terminal Connector Terminal
F31 4 F13 58 Existed
2. Also check harness for short to ground and short to power. F
Is the inspection result normal?
YES >> GO TO 8.

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NO >> Repair open circuit, short to ground or short to power in harness or connectors. G
8.CHECK MASS AIR FLOW SENSOR
Refer to EC-191, "Component Inspection". H
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace mass air flow sensor. Refer to EM-24, "Removal and Installation". I
9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
J

>> INSPECTION END

Component Inspection INFOID:0000000010094894 K

1.CHECK MASS AIR FLOW SENSOR-I

L
With CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT and select “DATA MONITOR” mode. M
4. Select “MAS A/F SE-B1” and check indication under the following conditions.

Monitor item Condition MAS A/F SE-B1 (V) N

Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2
MAS A/F SE-B1 O
2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm. P
Without CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.

Revision: August 2013 EC-191 2014 Maxima NAM

 P0102, P0103 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM harness connector terminals
under the following conditions.

ECM

Con- + – Condition Voltage (V)

nector Terminal Terminal
Ignition switch ON (Engine
Approx. 0.4
stopped.)

58 Idle (Engine is warmed-up to normal

56 0.9 - 1.2
(MAF operating temperature.) JMBIA1862ZZ
F13 (Sensor
sensor 2,500 rpm (Engine is warmed-up to
ground) 1.6 - 1.9
signal) normal operating temperature.)
0.9 - 1.2 to
Idle to about 4,000 rpm
Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK FOR THE CAUSE OF UNEVEN AIR FLOW VIA THE MASS AIR FLOW SENSOR

cardiagn.com
Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system parts
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK MASS AIR FLOW SENSOR-II
With CONSULT
1. Repair or replace malfunctioning part.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT and select “DATA MONITOR” mode.
4. Select “MAS A/F SE-B1” and check indication under the following conditions.

Monitor item Condition MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2
MAS A/F SE-B1
2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
1. Repair or replace malfunctioning part.
2. Start engine and warm it up to normal operating temperature.

Revision: August 2013 EC-192 2014 Maxima NAM

 P0102, P0103 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM harness connector terminals
under the following conditions. A

ECM
+ – Condition Voltage (V) EC
Con-
nector Terminal Terminal
Ignition switch ON (Engine
stopped.)
Approx. 0.4 C

58 Idle (Engine is warmed-up to normal

56 0.9 - 1.2
(MAF operating temperature.) JMBIA1862ZZ
F13
sensor
(Sensor D
ground) 2,500 rpm (Engine is warmed-up to
signal) 1.6 - 1.9
normal operating temperature.)
0.9 - 1.2 to
Idle to about 4,000 rpm E
Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal?
F
YES >> INSPECTION END
NO >> GO TO 4.
4.CHECK MASS AIR FLOW SENSOR-III

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G
With CONSULT
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again. H
3. Start engine and warm it up to normal operating temperature.
4. Connect CONSULT and select “DATA MONITOR” mode.
5. Select “MAS A/F SE-B1” and check indication under the following conditions.
I

Monitor item Condition MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.) Approx. 0.4 J
Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2
MAS A/F SE-B1
2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9
K
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT L
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again.
3. Start engine and warm it up to normal operating temperature.
4. Check the voltage between ECM harness connector terminals M
under the following conditions.

ECM N
Con- + – Condition Voltage (V)
nector Terminal Terminal
O
Ignition switch ON (Engine
Approx. 0.4
stopped.)

58 Idle (Engine is warmed-up to normal

56 operating temperature.)
0.9 - 1.2 JMBIA1862ZZ P
(MAF
F13 (Sensor
sensor 2,500 rpm (Engine is warmed-up to
ground) 1.6 - 1.9
signal) normal operating temperature.)
0.9 - 1.2 to
Idle to about 4,000 rpm
Approx. 2.4*
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal?
Revision: August 2013 EC-193 2014 Maxima NAM
 P0102, P0103 MAF SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> INSPECTION END
NO >> Clean or replace mass air flow sensor. Refer to EM-24, "Removal and Installation".

cardiagn.com

Revision: August 2013 EC-194 2014 Maxima NAM

 P0111 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0111 IAT SENSOR
A
Description INFOID:0000000010094895

The intake air temperature sensor is built-into the mass air flow sen- EC
sor (1). The sensor detects intake air temperature and transmits a
signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor C
decreases in response to the rise in temperature.

PBIA9559J E

<Reference data>
F
Intake air temperature
Voltage* (V) Resistance (kΩ)
[°C (°F)]

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25 (77) 3.3 1.800 - 2.200 G
80 (176) 1.2 0.283 - 0.359
*: These data are reference values and are measured between ECM terminals 50
(Intake air temperature sensor) and 56 (Sensor ground). H

SEF012P

I
DTC Logic INFOID:0000000010094896

DTC DETECTION LOGIC

J

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
(Trouble diagnosis content)
K
The comparison result of signals transmitted
to ECM from each temperature sensor (IAT
IAT SENSOR 1 B1 • Harness or connectors
sensor, ECT sensor, FTT sensor, and EOT
[Intake air temperature (IAT) (High or low resistance in the IAT sen- L
P0111 sensor) shows that the voltage signal of the
sensor circuit range/perfor- sor circuit)
IAT sensor is higher/lower than that of other
mance] • IAT sensor
temperature sensors when the engine is
started with its cold state.
M
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
N

Is it necessary to erase permanent DTC?

YES >> GO TO 3. O
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-196, "Component Function Check". P
NOTE:
Use the component function check to check the overall function of the IAT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-196, "Diagnosis Procedure".

Revision: August 2013 EC-195 2014 Maxima NAM

 P0111 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
• Before performing the following procedure, do not add fuel.
• Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between −10°C (14°F) and 35°C (95°F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:

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Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-196, "Diagnosis Procedure".
NO >> INSPECTION END
Component Function Check INFOID:0000000010094897

1.CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR

1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector.
3. Check resistance between mass air flow sensor terminals as follows.

Terminals Condition Resistance (kΩ)

1 and 2 Temperature [°C (°F)] 25 (77) 1.800 – 2.200
Is the inspection result normal?
YES >> GO TO 2.
NO >> Proceed to EC-196, "Diagnosis Procedure".
2.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-196, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010094898

1.CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR

Check intake air temperature sensor. Refer to EC-197, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.

Revision: August 2013 EC-196 2014 Maxima NAM

 P0111 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-24, "Removal and
Installation". A
2.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-41, "Intermittent Incident".
EC

>> INSPECTION END

Component Inspection INFOID:0000000010094899 C

1.CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR

D
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector.
3. Check resistance between mass air flow sensor terminals as follows.
E
Terminals Condition Resistance (kΩ)
1 and 2 Temperature [°C (°F)] 25 (77) 1.800 – 2.200
F
Is the inspection result normal?
YES >> INSPECTION END

cardiagn.com
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-24, "Removal and G
Installation".

Revision: August 2013 EC-197 2014 Maxima NAM

 P0112, P0113 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0112, P0113 IAT SENSOR
Description INFOID:0000000010094900

The intake air temperature sensor is built-into the mass air flow sen-
sor (1). The sensor detects intake air temperature and transmits a
signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the rise in temperature.

PBIA9559J

<Reference data>

Intake air temperature

Voltage* (V) Resistance (kΩ)
[°C (°F)]

cardiagn.com
25 (77) 3.3 1.800 - 2.200
80 (176) 1.2 0.283 - 0.359
*: These data are reference values and are measured between ECM terminals 50
(Intake air temperature sensor) and 56 (Sensor ground).

SEF012P

DTC Logic INFOID:0000000010094901

DTC DETECTION LOGIC

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name
Intake air tempera-
An excessively low voltage from the sensor is
P0112 ture sensor circuit
sent to ECM. • Harness or connectors
low input
(The sensor circuit is open or shorted.)
Intake air tempera- • Intake air temperature sensor
An excessively high voltage from the sensor is
P0113 ture sensor circuit
sent to ECM.
high input

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-199, "Diagnosis Procedure".
NO >> INSPECTION END

Revision: August 2013 EC-198 2014 Maxima NAM

 P0112, P0113 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010094902

A
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
EC
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
C
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT D
1. Disconnect mass air flow sensor (with intake air temperature sensor) harness connector.
2. Turn ignition switch ON.
3. Check the voltage between mass air flow sensor harness con- E
nector and ground.

MAF sensor F
Ground Voltage
Connector Terminal
F31 5 Ground Approx. 5 V

cardiagn.com
Is the inspection result normal? G
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIB1169E H
3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. I
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor harness connector and ECM harness connector.
J
MAF sensor ECM
Continuity
Connector Terminal Connector Terminal
F31 3 F13 56 Existed K
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
L
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK INTAKE AIR TEMPERATURE SENSOR M
Refer to EC-199, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5. N
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-24, "Removal and
Installation".
5.CHECK INTERMITTENT INCIDENT O
Refer to GI-41, "Intermittent Incident".

P
>> INSPECTION END
Component Inspection INFOID:0000000010094903

1.CHECK INTAKE AIR TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector.

Revision: August 2013 EC-199 2014 Maxima NAM

 P0112, P0113 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check resistance between mass air flow sensor terminals as per the following.

Terminal Condition Resistance (kΩ)

5 and 6 Temperature [°C (°F)] 25 (77) 1.800 - 2.200
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-24, "Removal and
Installation".

cardiagn.com

Revision: August 2013 EC-200 2014 Maxima NAM

 P0116 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0116 ECT SENSOR
A
Description INFOID:0000000010094904

The engine coolant temperature sensor is used to detect the engine EC

coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther- C
mistor decreases as temperature increases.

SEF594K E

<Reference data>
F
Engine coolant temperature
Voltage* (V) Resistance (kΩ)
[°C (°F)]

cardiagn.com
–10 (14) 4.4 7.0 - 11.4 G
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
H
90 (194) 0.9 0.236 - 0.260
*: These data are reference values and are measured between ECM terminals 46
SEF012P
(Engine coolant temperature sensor) and 52 (Sensor ground).
I
DTC Logic INFOID:0000000010094905

DTC DETECTION LOGIC J

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
(Trouble diagnosis content) K
The comparison result of signals transmitted
to ECM from each temperature sensor (IAT
ECT SEN/CIRC • Harness or connectors
sensor, ECT sensor, FTT sensor, and EOT L
[Engine coolant temperature (High or low resistance in the ECT
P0116 sensor) shows that the voltage signal of the
(ECT) sensor circuit range/per- sensor circuit)
ECT sensor is higher/lower than that of other
formance] • ECT sensor
temperature sensors when the engine is
started with its cold state. M
DTC CONFIRMATION PROCEDURE
1.INSPECTION START N

Is it necessary to erase permanent DTC?

YES >> GO TO 3. O
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK P
Perform component function check. Refer to EC-202, "Component Function Check".
NOTE:
Use the component function check to check the overall function of the ECT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-203, "Diagnosis Procedure".

Revision: August 2013 EC-201 2014 Maxima NAM

 P0116 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
• Before performing the following procedure, do not add fuel.
• Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between −10°C (14°F) and 35°C (95°F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:

cardiagn.com
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-203, "Diagnosis Procedure".
NO >> INSPECTION END
Component Function Check INFOID:0000000010094906

1.CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor. Refer to CO-24, "Removal and Installation".
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.

Terminals Condition Resistance (kΩ)

20 (68) 2.1 – 2.9
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 – 1.00
90 (194) 0.236 – 0.260
Is the inspection result normal?
YES >> GO TO 2. JMBIA0080ZZ
NO >> Proceed to EC-203, "Diagnosis Procedure".
2.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-203, "Diagnosis Procedure".

Revision: August 2013 EC-202 2014 Maxima NAM

 P0116 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010094907

A
1.CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Check ECT sensor. Refer to EC-203, "Component Inspection".
EC
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace ECT sensor. Refer to CO-24, "Removal and Installation".
C
2.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-41, "Intermittent Incident".
D
>> INSPECTION END
Component Inspection INFOID:0000000010094908
E

1.CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF. F
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".

cardiagn.com
4. Check resistance between engine coolant temperature sensor
G
terminals as per the following.

Terminals Condition Resistance (kΩ)

H
20 (68) 2.1 - 2.9
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260 I
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace engine coolant temperature sensor. Refer to
PBIB2005E
J
CO-24, "Removal and Installation".

Revision: August 2013 EC-203 2014 Maxima NAM

 P0117, P0118 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0117, P0118 ECT SENSOR
Description INFOID:0000000010094909

The engine coolant temperature sensor is used to detect the engine

coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

SEF594K

<Reference data>

Engine coolant temperature

Voltage* (V) Resistance (kΩ)
[°C (°F)]

cardiagn.com
–10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
*: These data are reference values and are measured between ECM terminals 46
SEF012P
(Engine coolant temperature sensor) and 52 (Sensor ground).

DTC Logic INFOID:0000000010094910

DTC DETECTION LOGIC

Trouble Diagnosis
DTC No. DTC detecting condition Possible Cause
Name
Engine coolant tem-
An excessively low voltage from the sensor is
P0117 perature sensor cir-
sent to ECM. • Harness or connectors
cuit low input
(The sensor circuit is open or shorted.)
Engine coolant tem- • Engine coolant temperature sensor
An excessively high voltage from the sensor is
P0118 perature sensor cir-
sent to ECM.
cuit high input

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-205, "Diagnosis Procedure".
NO >> INSPECTION END

Revision: August 2013 EC-204 2014 Maxima NAM

 P0117, P0118 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010094911

A
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
EC
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
C
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK ECT SENSOR POWER SUPPLY CIRCUIT D
1. Disconnect engine coolant temperature (ECT) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between ECT sensor harness connector and E
ground.

ECT sensor F
Ground Voltage
Connector Terminal
F11 1 Ground Approx. 5 V

cardiagn.com
Is the inspection result normal? G
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIB0080E H
3.CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. I
2. Disconnect ECM harness connector.
3. Check the continuity between ECT sensor harness connector and ECM harness connector.
J
ECT sensor ECM
Continuity
Connector Terminal Connector Terminal
F11 2 F13 52 Existed K
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
L
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK ENGINE COOLANT TEMPERATURE SENSOR M
Refer to EC-205, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5. N
NO >> Replace engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".
5.CHECK INTERMITTENT INCIDENT
O
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END P

Component Inspection INFOID:0000000010094912

1.CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".

Revision: August 2013 EC-205 2014 Maxima NAM

 P0117, P0118 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check resistance between engine coolant temperature sensor
terminals as per the following.

Terminals Condition Resistance (kΩ)

20 (68) 2.1 - 2.9
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Is the inspection result normal?
YES >> INSPECTION END PBIB2005E
NO >> Replace engine coolant temperature sensor. Refer to
CO-24, "Removal and Installation".

cardiagn.com

Revision: August 2013 EC-206 2014 Maxima NAM

 P0122, P0123 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0122, P0123 TP SENSOR
A
Description INFOID:0000000010094913

Electric throttle control actuator consists of throttle control motor, EC

throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into C
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to D
driving conditions via the throttle control motor.

PBIB0145E E
DTC Logic INFOID:0000000010094914

DTC DETECTION LOGIC F

NOTE:
If DTC P0122 or P0123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

cardiagn.com
Refer to EC-394, "DTC Logic". G

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Throttle position sensor An excessively low voltage from the TP sensor H
P0122 • Harness or connectors
2 circuit low input 2 is sent to ECM. (TP sensor 2 circuit is open or shorted.)
Throttle position sensor An excessively high voltage from the TP sensor • Electric throttle control actuator
P0123 (TP sensor 2)
2 circuit high input 2 is sent to ECM. I

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING J
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. K
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION: L
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2. M
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC. N
Is DTC detected?
YES >> Go to EC-207, "Diagnosis Procedure".
NO >> INSPECTION END O

Diagnosis Procedure INFOID:0000000010094915

P
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.

Revision: August 2013 EC-207 2014 Maxima NAM

 P0122, P0123 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Repair or replace ground connection.
2.CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch ON.
3. Check the voltage between electric throttle control actuator har-
ness connector and ground.

Electric throttle control actuator

Ground Voltage
Connector Terminal
F57 1 Ground Approx. 5 V
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIB3484E

3.CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-

cardiagn.com
nector.

Electric throttle control actuator ECM

Continuity
Connector Terminal Connector Terminal
F57 4 F13 36 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

Electric throttle control actuator ECM

Continuity
Connector Terminal Connector Terminal
F57 3 F13 38 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK THROTTLE POSITION SENSOR
Refer to EC-209, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Refer to EC-209, "Special Repair Requirement".

>> INSPECTION END

Revision: August 2013 EC-208 2014 Maxima NAM

 P0122, P0123 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

7.CHECK INTERMITTENT INCIDENT A

Refer to GI-41, "Intermittent Incident".

>> INSPECTION END EC

Component Inspection INFOID:0000000010094916

1.CHECK THROTTLE POSITION SENSOR C

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.
D
3. Perform EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
4. Turn ignition switch ON.
5. Set selector lever to D position.
6. Check the voltage between ECM harness connector terminals E
under the following conditions.

ECM F
Con- + – Condition Voltage
nector

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Terminal Terminal
G
37 Fully released More than 0.36 V
(TP sensor
1 signal) 36 Fully depressed Less than 4.75 V
Accelera-
F13 (Sensor H
38 tor pedal Fully released Less than 4.75 V JMBIA1864ZZ
ground)
(TP sensor
2 signal) Fully depressed More than 0.36 V

Is the inspection result normal? I

YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR J

1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Go to EC-209, "Special Repair Requirement".
K

>> INSPECTION END

Special Repair Requirement INFOID:0000000010094917
L

1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

M
Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2. N
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
O
>> END

Revision: August 2013 EC-209 2014 Maxima NAM

 P0125 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0125 ECT SENSOR
Description INFOID:0000000010094918

The engine coolant temperature sensor is used to detect the engine

coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

SEF594K

<Reference data>

Engine coolant temperature

Voltage* (V) Resistance (kΩ)
[°C (°F)]

cardiagn.com
–10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
*: These data are reference values and are measured between ECM terminals 46
SEF012P
(Engine coolant temperature sensor) and 52 (Sensor ground).

DTC Logic INFOID:0000000010094919

DTC DETECTION LOGIC

NOTE:
• If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to EC-
201, "DTC Logic".
• If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117,
P0118. Refer to EC-204, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Voltage sent to ECM from the sensor is not
• Harness or connectors
Insufficient engine cool- practical, even when some time has passed
(High resistance in the circuit.)
P0125 ant temperature for after starting the engine.
• Engine coolant temperature sensor
closed loop fuel control • Engine coolant temperature is insufficient for
• Thermostat
closed loop fuel control.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION
With CONSULT
1. Turn ignition switch ON.

Revision: August 2013 EC-210 2014 Maxima NAM

 P0125 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Select “DATA MONITOR” mode with CONSULT.
3. Check that “COOLAN TEMP/S” is above 10°C (50°F). A
With GST
Follow the procedure “With CONSULT” above.
Is the temperature above 10°C (50°F)? EC
YES >> INSPECTION END
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE C

With CONSULT
1. Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 10°C (50°F) within 65 minutes, stop engine because D
the test result will be OK.
CAUTION:
Never overheat engine. E
2. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
F
Is 1st trip DTC detected?
YES >> EC-211, "Diagnosis Procedure"

cardiagn.com
NO >> INSPECTION END G
Diagnosis Procedure INFOID:0000000010094920

1.CHECK GROUND CONNECTION H

1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal? I
YES >> GO TO 2.
NO >> Repair or replace ground connection.
J
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-211, "Component Inspection".
Is the inspection result normal? K
YES >> GO TO 3.
NO >> Replace engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".
3.CHECK THERMOSTAT OPERATION L

When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm that the
engine coolant does not flow.
M
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace thermostat. Refer to CO-22, "Removal and Installation".
N
4.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
O

>> INSPECTION END

P
Component Inspection INFOID:0000000010094921

1.CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".

Revision: August 2013 EC-211 2014 Maxima NAM

 P0125 ECT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check resistance between engine coolant temperature sensor
terminals as per the following.

Terminals Condition Resistance (kΩ)

20 (68) 2.1 - 2.9
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Is the inspection result normal?
YES >> INSPECTION END PBIB2005E
NO >> Replace engine coolant temperature sensor. Refer to
CO-24, "Removal and Installation".

cardiagn.com

Revision: August 2013 EC-212 2014 Maxima NAM

 P0127 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0127 IAT SENSOR
A
Description INFOID:0000000010094922

The intake air temperature sensor is built-into the mass air flow sen- EC
sor (1). The sensor detects intake air temperature and transmits a
signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor C
decreases in response to the rise in temperature.

PBIA9559J E

<Reference data>
F
Intake air temperature
Voltage* (V) Resistance (kΩ)
[°C (°F)]

cardiagn.com
25 (77) 3.3 1.800 - 2.200 G
80 (176) 1.2 0.283 - 0.359
*: These data are reference values and are measured between ECM terminals 50
(Intake air temperature sensor) and 56 (Sensor ground). H

SEF012P

I
DTC Logic INFOID:0000000010094923

DTC DETECTION LOGIC

J

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Rationally incorrect voltage from the sensor is • Harness or connectors K
Intake air temperature
P0127 sent to ECM, compared with the voltage signal (The sensor circuit is open or shorted)
too high
from engine coolant temperature sensor. • Intake air temperature sensor

DTC CONFIRMATION PROCEDURE L

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- M
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. N
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road
test is expected to be easier, it is unnecessary to lift the vehicle. O

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE P

With CONSULT
1. Wait until engine coolant temperature is less than 90°C (194°F)
- Turn ignition switch ON.
- Select “DATA MONITOR” mode with CONSULT.
- Check the engine coolant temperature.

Revision: August 2013 EC-213 2014 Maxima NAM

 P0127 IAT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
- If the engine coolant temperature is not less than 90°C (194°F), turn ignition switch OFF and cool down
engine.
NOTE:
Perform the following steps before engine coolant temperature is above 90°C (194°F).
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT.
4. Start engine.
5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
CAUTION:
Always drive vehicle at a safe speed.
6. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-214, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094924

1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

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2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-214, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-24, "Removal and
Installation".
3.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094925

1.CHECK INTAKE AIR TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector.
3. Check resistance between mass air flow sensor terminals as per the following.

Terminal Condition Resistance (kΩ)

5 and 6 Temperature [°C (°F)] 25 (77) 1.800 - 2.200
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-24, "Removal and
Installation".

Revision: August 2013 EC-214 2014 Maxima NAM

 P0128 THERMOSTAT FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0128 THERMOSTAT FUNCTION
A
DTC Logic INFOID:0000000010094926

DTC DETECTION LOGIC EC

NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306, first perform
the trouble diagnosis for DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306. Refer to EC-287, C
"DTC Logic".
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leakage in the seal or the thermostat being stuck open. D

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
E
• Thermostat
The engine coolant temperature does not reach
• Leakage from sealing portion of thermo-
P0128 Thermostat function to specified temperature even though the en-
stat
gine has run long enough.
• Engine coolant temperature sensor F
DTC CONFIRMATION PROCEDURE

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NOTE:
Never refuel before and during the following procedure. G

1.PRECONDITIONING-I
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure H
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. I

>> GO TO 2. J
2.PRECONDITIONING-II
With CONSULT
1. Turn ignition switch ON. K
2. Check the following conditions:

Ambient temperature −10°C (14°F) or more L

A/C switch OFF
Blower fan switch OFF
M
3. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
4. Check the following conditions:
N
COOLAN TEMP/S −10°C – 52°C (14 – 126°F)
Is the condition satisfied?
YES >> GO TO 3. O
NO >> 1. Satisfy the condition.
2. GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-I P

With CONSULT
1. Start engine.
2. Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
- STEP 1

Revision: August 2013 EC-215 2014 Maxima NAM

 P0128 THERMOSTAT FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Drive the vehicle under the conditions instructed below until the difference between “COOLAN TEMP/S” and
“FUEL T/TMP SE” becomes at least 25°C (45°F).

COOLAN TEMP/S 71°C (159°F) or less

FUEL T/TMP SE Less than the value calculated by sub-
tracting 25°C (45°F) from “COOLAN
TEMP/S”.*

*: Example

COOLAN TEMP/S FUEL T/TMP SE

70°C (158°F) 45°C (113°F) or less
65°C (149°F) 40°C (104°F) or less
60°C (140°F) 35°C (95°F) or less
- STEP 2
Drive the vehicle at 50 km/h (32 MPH) or more with the difference between “COOLAN TEMP/S” and “FUEL
T/TMP SE” maintained at 25°C (45°F) or more.
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
- STEP 3
Drive the vehicle at 50 km/h (32 MPH) or more until “COOLAN TEMP/S” increases by 7°C (13°F).

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NOTE:
Keep the accelerator pedal as steady as possible during cruising.
Is the condition satisfied?
YES >> GO TO 4.
NO >> GO TO 1.
4.PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1. Drive the vehicle until the following condition is satisfied.

COOLAN TEMP/S 71°C (159°F) or more

CAUTION:
Always drive vehicle at safe speed.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-216, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094927

1.CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to EC-216, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".
2.CHECK THERMOSTAT
Check thermostat. Refer to CO-22, "Removal and Installation".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace thermostat. Refer to CO-22, "Removal and Installation".
Component Inspection INFOID:0000000010094928

1.CHECK ENGINE COOLANT TEMPERATURE SENSOR

Revision: August 2013 EC-216 2014 Maxima NAM
 P0128 THERMOSTAT FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector. A
3. Remove engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".
4. Check resistance between engine coolant temperature sensor
terminals as per the following.
EC

Terminals Condition Resistance (kΩ)

20 (68) 2.1 - 2.9 C
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
D
Is the inspection result normal?
YES >> INSPECTION END PBIB2005E
NO >> Replace engine coolant temperature sensor. Refer to
CO-24, "Removal and Installation". E

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G

Revision: August 2013 EC-217 2014 Maxima NAM

 P0130, P0150 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0130, P0150 A/F SENSOR 1
Description INFOID:0000000010094929

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse via the diffusion layer at the
sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
JMBIA0112GB

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C
(1,472°F).

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PBIB3354E

DTC Logic INFOID:0000000010094930

DTC DETECTION LOGIC

To judge malfunctions, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 sig-
nal fluctuates according to fuel feedback control.

DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
The A/F signal computed by ECM from the A/F
A) sensor 1 signal is constantly in a range other
Air fuel ratio (A/F) sensor 1 than approx. 2.2 V.
P0130
(bank 1) circuit
The A/F signal computed by ECM from the A/F • Harness or connectors
B)
sensor 1 signal is constantly approx. 2.2 V. (The sensor circuit is open or
The A/F signal computed by ECM from the A/F shorted.)
A) sensor 1 signal is constantly in a range other • A/F sensor 1
Air fuel ratio (A/F) sensor 1 than approx. 2.2 V.
P0150
(bank 2) circuit
The A/F signal computed by ECM from the A/F
B)
sensor 1 signal is constantly approx. 2.2 V.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.

Revision: August 2013 EC-218 2014 Maxima NAM

 P0130, P0150 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A A

1. Start engine and warm it up to normal operating temperature.
2. Let it idle for 2 minutes.
3. Check 1st trip DTC.
EC
Is 1st trip DTC detected?
YES >> Go to EC-220, "Diagnosis Procedure".
NO-1 >> With CONSULT: GO TO 3.
C
NO-2 >> Without CONSULT: GO TO 7.
3.CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
1. Start engine and warm it up to normal operating temperature. D
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
Does the indication fluctuate around 2.2 V? E
YES >> GO TO 4.
NO >> Go to EC-220, "Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-I F
1. Select “A/F SEN1 (B1) P1276” (for DTC P0130) or “A/F SEN1 (B2) P1286” (for DTC P0150) of “A/F
SEN1” in “DTC WORK SUPPORT” mode with CONSULT.

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2. Touch “START”. G
3. When the following conditions are met, “TESTING” will be displayed on the CONSULT screen.

ENG SPEED 1,000 - 3,200 rpm H

VHCL SPEED SE More than 64 km/h (40 mph)
B/FUEL SCHDL 1.0 - 8.0 msec
I
Selector lever D position
If “TESTING” is not displayed after 20 seconds, retry from step 2.
CAUTION: J
Always drive vehicle at a safe speed.
Is “TESTING” displayed on CONSULT screen?
YES >> GO TO 5. K
NO >> Check A/F sensor 1 function again. GO TO 3.
5.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-II
L
Release accelerator pedal fully.
NOTE:
Never apply brake when releasing the accelerator pedal.
Which does “TESTING” change to? M
COMPLETED>>GO TO 6.
OUT OF CONDITION>>Retry DTC CONFIRMATION PROCEDURE. GO TO 4.
6.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-III N

Touch “SELF-DIAG RESULT”.

Which is displayed on CONSULT screen? O
OK >> INSPECTION END
NG >> Go to EC-220, "Diagnosis Procedure".
7.PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B P
Perform component function check. Refer to EC-220, "Component Function Check".
NOTE:
Use component function check to check the overall function of the A/F sensor 1 circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END

Revision: August 2013 EC-219 2014 Maxima NAM

 P0130, P0150 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Go to EC-220, "Diagnosis Procedure".
Component Function Check INFOID:0000000010094931

1.PERFORM COMPONENT FUNCTION CHECK

With GST
1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.
3. Set D position, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (31
MPH).
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
Never apply brake when releasing the accelerator pedal.
4. Repeat steps 2 and 3 for five times.
5. Stop the vehicle and turn ignition switch OFF.
6. Wait at least 10 seconds and restart engine.
7. Repeat steps 2 and 3 for five times.
8. Stop the vehicle and connect GST to the vehicle.
9. Check 1st trip DTC.
Is 1st trip DTC detected?

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YES >> Go to EC-220, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094932

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and
ground.

A/F sensor 1
DTC Ground Voltage
Bank Connector Terminal
P0130 1 F12 4
Ground Battery voltage
P0150 2 F61 4
Is the inspection result normal?
YES >> GO TO 4. PBIB3308E
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector F10
• 15 A fuse (No. 37)
• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

Revision: August 2013 EC-220 2014 Maxima NAM

 P0130, P0150 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

4.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
EC

A/F sensor 1 ECM

DTC Continuity
Bank Connector Terminal Connector Terminal C
1 45
P0130 1 F12
2 49
F13 Existed D
1 53
P0150 2 F61
2 57
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector E
and ground.

A/F sensor 1 F
DTC Ground Continuity
Bank Connector Terminal
1

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P0130 1 F12
2 G
Ground Not existed
1
P0150 2 F61
2
H

ECM
DTC Ground Continuity
Connector Terminal I
45
P0130
49
F13 Ground Not existed J
53
P0150
57
5. Also check harness for short to power. K
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. L
5.CHECK INTERMITTENT INCIDENT
Perform GI-41, "Intermittent Incident". M
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace malfunctioning part. N
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH). O
CAUTION:
• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. P
• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

Revision: August 2013 EC-221 2014 Maxima NAM

 P0131, P0151 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0131, P0151 A/F SENSOR 1
Description INFOID:0000000010094933

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse via the diffusion layer at the
sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
JMBIA0112GB

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C
(1,472°F).

cardiagn.com
PBIB3354E

DTC Logic INFOID:0000000010094934

DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately low.

DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
Air fuel ratio (A/F) sensor 1
P0131 • Harness or connectors
(bank 1) circuit low voltage • The A/F signal computed by ECM from the A/F
(The sensor circuit is open or shorted.)
Air fuel ratio (A/F) sensor 1 sensor 1 signal is constantly approx. 0 V.
P0151 • A/F sensor 1
(bank 2) circuit low voltage

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.
2.CHECK A/F SENSOR 1 FUNCTION
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.

Revision: August 2013 EC-222 2014 Maxima NAM

 P0131, P0151 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
With GST
Follow the procedure “With CONSULT” above. A
Is the indication constantly approx. 0 V?
YES >> Go to EC-223, "Diagnosis Procedure".
NO >> GO TO 3. EC
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT C
1. Turn ignition switch OFF, wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF, wait at least 10 seconds and then restart engine.
4. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine. D
CAUTION:
Always drive vehicle at a safe speed.
5. Maintain the following conditions for about 20 consecutive seconds. E

ENG SPEED 1,000 - 3,200 rpm

VHCL SPEED SE More than 40 km/h (25 mph) F
B/FUEL SCHDL 1.5 - 9.0 msec

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Selector lever Suitable position
G
NOTE:
• Keep the accelerator pedal as steady as possible during cruising.
• If this procedure is not completed within 1 minute after restarting engine at step 1, return to step
H
1.
6. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above. I
Is 1st trip DTC detected?
YES >> Go to EC-223, "Diagnosis Procedure".
NO >> INSPECTION END J

Diagnosis Procedure INFOID:0000000010094935

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". K

1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF. L
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2. M
NO >> Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
N
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and
ground. O

A/F sensor 1
DTC Ground Voltage P
Bank Connector Terminal
P0131 1 F12 4
Ground Battery voltage
P0151 2 F61 4
Is the inspection result normal?
YES >> GO TO 4. PBIB3308E
NO >> GO TO 3.

Revision: August 2013 EC-223 2014 Maxima NAM

 P0131, P0151 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.DETECT MALFUNCTIONING PART

Check the following.
• IPDM E/R harness connector F10
• 15 A fuse (No. 37)
• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

4.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

A/F sensor 1 ECM

DTC Continuity
Bank Connector Terminal Connector Terminal
1 45
P0131 1 F12
2 49
F13 Existed
1 53

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P0151 2 F61
2 57
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

A/F sensor 1
DTC Ground Continuity
Bank Connector Terminal
1
P0131 1 F12
2
Ground Not existed
1
P0151 2 F61
2

ECM
DTC Ground Continuity
Connector Terminal
45
P0131
49
F13 Ground Not existed
53
P0151
57
5. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK INTERMITTENT INCIDENT
Perform GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace malfunctioning part.
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH).
CAUTION:

Revision: August 2013 EC-224 2014 Maxima NAM

 P0131, P0151 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. A
• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
EC

>> INSPECTION END

C

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G

Revision: August 2013 EC-225 2014 Maxima NAM

 P0132, P0152 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0132, P0152 A/F SENSOR 1
Description INFOID:0000000010094936

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse via the diffusion layer at the
sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
JMBIA0112GB

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C
(1,472°F).

cardiagn.com
PBIB3354E

DTC Logic INFOID:0000000010094937

DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately high.

DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
Air fuel ratio (A/F) sensor 1
P0132 • Harness or connectors
(bank 1) circuit high voltage • The A/F signal computed by ECM from the A/F
(The sensor circuit is open or shorted.)
Air fuel ratio (A/F) sensor 1 sensor 1 signal is constantly approx. 5 V.
P0152 • A/F sensor 1
(bank 2) circuit high voltage

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always preform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.
2.CHECK A/F SENSOR 1 FUNCTION
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.

Revision: August 2013 EC-226 2014 Maxima NAM

 P0132, P0152 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
With GST
Follow the procedure “With CONSULT” above. A
Is the indication constantly approx. 5 V?
YES >> Go to EC-227, "Diagnosis Procedure".
NO >> GO TO 3. EC
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT C
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF, wait at least 10 seconds and then restart engine.
4. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine. D
CAUTION:
Always drive vehicle at a safe speed.
5. Maintain the following conditions for about 20 consecutive seconds. E

ENG SPEED 1,000 - 3,200 rpm

VHCL SPEED SE More than 40 km/h (25 mph) F
B/FUEL SCHDL 1.5 - 9.0 msec

cardiagn.com
Selector lever Suitable position
G
NOTE:
• Keep the accelerator pedal as steady as possible during the cruising.
• If this procedure is not completed within 1 minute after restarting engine at step 1, return to step
H
1.
6. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above. I
Is 1st trip DTC detected?
YES >> Go to EC-227, "Diagnosis Procedure".
NO >> INSPECTION END J

Diagnosis Procedure INFOID:0000000010094938

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". K

1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF. L
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2. M
NO >> Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
N
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and
ground. O

A/F sensor 1
DTC Ground Voltage P
Bank Connector Terminal
P0132 1 F12 4
Ground Battery voltage
P0152 2 F61 4
Is the inspection result normal?
YES >> GO TO 4. PBIB3308E
NO >> GO TO 3.

Revision: August 2013 EC-227 2014 Maxima NAM

 P0132, P0152 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.DETECT MALFUNCTIONING PART

Check the following.
• IPDM E/R harness connector F10
• 15 A fuse (No. 37)
• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

4.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

A/F sensor 1 ECM

DTC Continuity
Bank Connector Terminal Connector Terminal
1 45
P0132 1 F12
2 49
F13 Existed
1 53

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P0152 2 F61
2 57
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

A/F sensor 1
DTC Ground Continuity
Bank Connector Terminal
1
P0132 1 F12
2
Ground Not existed
1
P0152 2 F61
2

ECM
DTC Ground Continuity
Connector Terminal
45
P0132
49
F13 Ground Not existed
53
P0152
57
5. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK INTERMITTENT INCIDENT
Perform GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace malfunctioning part.
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH).
CAUTION:

Revision: August 2013 EC-228 2014 Maxima NAM

 P0132, P0152 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. A
• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
EC

>> INSPECTION END

C

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G

Revision: August 2013 EC-229 2014 Maxima NAM

 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0137, P0157 HO2S2
Description INFOID:0000000010094939

The heated oxygen sensor 2, after three way catalyst (manifold),

monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
SEF327R

DTC Logic INFOID:0000000010094940

DTC DETECTION LOGIC

The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-

cardiagn.com
gen storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during various driving conditions such as fuel-cut.

JSBIA0243GB

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Heated oxygen sensor 2 • Harness or connectors
P0137 (bank 1) circuit low volt- (The sensor circuit is open or shorted.)
age The maximum voltage from the sensor does not • Heated oxygen sensor 2
Heated oxygen sensor 2 reach the specified voltage. • Fuel pressure
P0157 (bank 2) circuit low volt- • Fuel injector
age • Intake air leakage

DTC CONFIRMATION PROCEDURE

1.INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 5.
2.PRECONDITIONING
If DTC confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 °C (32 to 86 °F).

>> GO TO 3.

Revision: August 2013 EC-230 2014 Maxima NAM

 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.PERFORM DTC CONFIRMATION PROCEDURE A

With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature. EC
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. C
7. Let engine idle for 1 minute.
8. Check that “COOLAN TEMP/S” indicates more than 70°C (158°F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70°C (158°F). D
9. Open engine hood.
10. Select “HO2S2 (B1) P1147” (for DTC P0137) or “HO2S2 (B2) P1167” (for DTC P0157) of “HO2S2” in
“DTC WORK SUPPORT” mode with CONSULT display.
11. Follow the instruction of CONSULT. E
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
12. Touch “SELF-DIAG RESULTS”. F
Which is displayed on CONSULT screen?
OK >> INSPECTION END

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NG >> Go to EC-233, "Diagnosis Procedure". G
CANNOT BE DIAGNOSED>>GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle). H
2. Perform DTC confirmation procedure again.

>> GO TO 3. I

5.PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to EC-231, "Component Function Check". J
NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
K
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-233, "Diagnosis Procedure". L
Component Function Check INFOID:0000000010094941

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". M

1.PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT
N
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds. O
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
P

Revision: August 2013 EC-231 2014 Maxima NAM

 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
7. Check the voltage between ECM harness connector terminals
under the following conditions.

JMBIA1865ZZ

ECM
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33
P0137 [HO2S2 (bank 1)
signal] 35
Revving up to 4,000 rpm under no The voltage should be above 0.78 V
F13 (Sensor

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34 load at least 10 times at least once during this procedure.
ground)
P0157 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector terminals under
the following conditions.

JMBIA1866ZZ

ECM
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33
P0137 [HO2S2 (bank 1)
signal] 35
Keeping engine at idle for 10 min- The voltage should be above 0.78 V
F13 (Sensor
34 utes at least once during this procedure.
ground)
P0157 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK-III

Revision: August 2013 EC-232 2014 Maxima NAM

 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check the voltage between ECM harness connector terminals under
the following conditions. A

EC

JMBIA1867ZZ

ECM
E
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33 F
P0137 [HO2S2 (bank 1)
signal] 35
Coasting from 80 km/h (50 MPH) in The voltage should be above 0.78 V
F13 (Sensor

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34 D position at least once during this procedure.
ground) G
P0157 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
H
YES >> INSPECTION END
NO >> Go to EC-233, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010094942 I

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION J
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal? K
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CLEAR MIXTURE RATIO SELF-LEARNING VALUE L

1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
M
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 detected? Is it difficult to start engine?
YES >> Perform trouble diagnosis for DTC P0171 or P0174. Refer to EC-261, "DTC Logic".
N
NO >> GO TO 3.
3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. O
2. Disconnect heated oxygen sensor 2 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness P
connector.

HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
P0137 1 F62 1
F13 35 Existed
P0157 2 F56 1

Revision: August 2013 EC-233 2014 Maxima NAM

 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.

HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
P0137 1 F62 4 33
F13 Existed
P0157 2 F56 4 34
2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.

HO2S2
DTC Ground Continuity
Bank Connector Terminal
P0137 1 F62 4

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Ground Not existed
P0157 2 F56 4

ECM
DTC Ground Continuity
Connector Terminal
P0137 33
F13 Ground Not existed
P0157 34
3. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK HEATED OXYGEN SENSOR 2
Refer to EC-235, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

7.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Revision: August 2013 EC-234 2014 Maxima NAM

 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Component Inspection INFOID:0000000010094943

A
1.INSPECTION START
Will CONSULT be used?
EC
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3.
C
2.CHECK HEATED OXYGEN SENSOR 2
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT. D
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. E
5. Let engine idle for 1 minute.
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ±25%. F

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G

JSBIA3451ZZ I
: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is −25%.
Is the inspection result normal? J
YES >> INSPECTION END
NO >> GO TO 6.
3.CHECK HEATED OXYGEN SENSOR 2-I K

Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
L
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Check the voltage between ECM harness connector terminals M
under the following conditions.

ECM N
Con- + – Condition Voltage
nector Terminal Terminal
O
33 The voltage should be
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35 Revving up to 4,000
dure. JMBIA1865ZZ P
F13 (Sensor rpm under no load at
34 The voltage should be
ground) least 10 times
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 4.
Revision: August 2013 EC-235 2014 Maxima NAM
 P0137, P0157 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

4.CHECK HEATED OXYGEN SENSOR 2-II

Check the voltage between ECM harness connector terminals under
the following conditions.

ECM

Con- + – Condition Voltage

nector Terminal Terminal
33 The voltage should be
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35
Keeping engine at dure. JMBIA1866ZZ
F13 (Sensor
34 idle for 10 minutes The voltage should be
ground)
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 5.
5.CHECK HEATED OXYGEN SENSOR 2-III

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Check the voltage between ECM harness connector terminals under
the following conditions.

ECM

Con- + – Condition Voltage

nector Terminal Terminal
33 The voltage should be
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35 Coasting from 80 km/
dure. JMBIA1867ZZ
F13 (Sensor h (50 MPH) in D posi-
34 The voltage should be
ground) tion
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

Revision: August 2013 EC-236 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0138, P0158 HO2S2
A
Description INFOID:0000000010094944

The heated oxygen sensor 2, after three way catalyst (manifold), EC

monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2. C
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions. D
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
SEF327R E
DTC Logic INFOID:0000000010094945

DTC DETECTION LOGIC F

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/
F) sensor 1. The oxygen storage capacity of the three way catalyst (manifold) causes the longer switching

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time. G
MALFUNCTION A
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the voltage is unusually high during various driving condi-
H
tions such as fuel cut.

PBIB1848E

K
MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor is sufficiently low during var-
L
ious driving conditions such as fuel cut.

PBIB2376E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause O
• Harness or connectors
An excessively high voltage from the sen-
A) (The sensor circuit is open or shorted.)
sor is sent to ECM.
• Heated oxygen sensor 2 P
Heated oxygen sensor 2
P0138 (bank 1) circuit high volt- • Harness or connectors
age (The sensor circuit is open or shorted.)
The minimum voltage from the sensor is
B) • Heated oxygen sensor 2
not reached to the specified voltage.
• Fuel pressure
• Fuel injector

Revision: August 2013 EC-237 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
An excessively high voltage from the sen-
A) (The sensor circuit is open or shorted.)
sor is sent to ECM.
• Heated oxygen sensor 2
Heated oxygen sensor 2
P0158 (bank 2) circuit high volt- • Harness or connectors
age (The sensor circuit is open or shorted.)
The minimum voltage from the sensor is
B) • Heated oxygen sensor 2
not reached to the specified voltage.
• Fuel pressure
• Fuel injector

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

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1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-240, "Diagnosis Procedure".
NO-1 >> With CONSULT: GO TO 3.
NO-2 >> Without CONSULT: GO TO 5.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 °C (32 to 86 °F).
1. Select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Check that “COOLAN TEMP/S” indicates more than 70°C (158°F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70°C (158°F).
9. Open engine hood.
10. Select “HO2S2 (B1) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in
“DTC WORK SUPPORT” mode with CONSULT.
11. Follow the instruction of CONSULT display.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
12. Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT screen?
OK >> INSPECTION END
NG >> Go to EC-240, "Diagnosis Procedure".
CON NOT BE DIAGNOSED>>GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN
1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2. Perform DTC confirmation procedure again.
Revision: August 2013 EC-238 2014 Maxima NAM
 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

>> GO TO 3. A
5.PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
Perform component function check. Refer to EC-239, "Component Function Check". EC
NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
C
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-240, "Diagnosis Procedure".
D
Component Function Check INFOID:0000000010094946

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". E

1.PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT
1. Start engine and warm it up to the normal operating temperature. F
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.

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4. Turn ignition switch OFF and wait at least 10 seconds. G
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Check the voltage between ECM harness connector terminals
under the following conditions. H

JMBIA1865ZZ
K

ECM
L
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33 M
P0138 [HO2S2 (bank 1)
signal] 35
Revving up to 4,000 rpm under no The voltage should be below 0.18 V
F13 (Sensor
34 load at least 10 times at least once during this procedure. N
ground)
P0158 [HO2S2 (bank 2)
signal]
Is the inspection result normal? O
YES >> INSPECTION END
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK-II P

Revision: August 2013 EC-239 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check the voltage between ECM harness connector terminals under
the following conditions.

JMBIA1866ZZ

ECM
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33
P0138 [HO2S2 (bank 1)
signal] 35
Keeping engine speed at idle for 10 The voltage should be below 0.18 V
F13 (Sensor

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34 minutes at least once during this procedure.
ground)
P0158 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector terminals under
the following conditions.

JMBIA1867ZZ

ECM
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33
P0138 [HO2S2 (bank 1)
signal] 35
Coasting from 80 km/h (50 MPH) in D The voltage should be below 0.18 V
F13 (Sensor
34 position at least once during this procedure.
ground)
P0158 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-240, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010094947

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

Revision: August 2013 EC-240 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

1.INSPECTION START A
Confirm the detected malfunction (A or B). Refer to EC-237, "DTC Logic".
Which malfunction is detected?
A >> GO TO 2. EC
B >> GO TO 9.
2.CHECK GROUND CONNECTION
C
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
D
YES >> GO TO 3.
NO >> Repair or replace ground connection.
3.CHECK HO2S2 CONNECTOR FOR WATER E
1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
2. Check that water is not inside conductors.
Is the inspection result normal? F
YES >> GO TO 4.
NO >> Repair or replace harness or connectors.

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4.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT G
1. Disconnect ECM harness connector.
2. Check the continuity between HO2S2 harness connector and ECM harness connector.
H

HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
I
P0138 1 F62 1
F13 35 Existed
P0158 2 F56 1
3. Also check harness for short to ground and short to power. J
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. K

5.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between HO2S2 harness connector and ECM harness connector. L

HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal M
P0138 1 F62 4 33
F13 Existed
P0158 2 F56 4 34
N
2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
O
HO2S2
DTC Ground Continuity
Bank Connector Terminal
P0138 1 F62 4 P
Ground Not existed
P0158 2 F56 4

Revision: August 2013 EC-241 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ECM
DTC Ground Continuity
Connector Terminal
P0138 33
F13 Ground Not existed
P0158 34
3. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK HEATED OXYGEN SENSOR 2
Refer to EC-244, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).

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CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

9.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair or replace ground connection.
10.CLEAR MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected? Is it difficult to start engine?
YES >> Perform trouble diagnosis for DTC P0172, P0175. Refer to EC-265, "DTC Logic".
NO >> GO TO 11.
11.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between HO2S2 harness connector and ECM harness connector.

Revision: August 2013 EC-242 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

HO2S2 ECM A
DTC Continuity
Bank Connector Terminal Connector Terminal
P0138 1 F62 1
F8 13 Existed EC
P0158 2 F56 1
5. Also check harness for short to ground and short to power.
Is the inspection result normal? C
YES >> GO TO 12.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT D

1. Check the continuity between HO2S2 harness connector and ECM harness connector.
E
HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
P0138 1 F62 4 33 F
F13 Existed
P0158 2 F56 4 34

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2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground. G

HO2S2
DTC Ground Continuity H
Bank Connector Terminal
P0138 1 F62 4
Ground Not existed
P0158 2 F56 4 I

ECM
DTC Ground Continuity J
Connector Terminal
P0138 33
F13 Ground Not existed
P0158 34 K
3. Also check harness for short to power.
Is the inspection result normal?
L
YES >> GO TO 13.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
13.CHECK HEATED OXYGEN SENSOR 2 M
Refer to EC-244, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 15. N
NO >> GO TO 14.
14.REPLACE HEATED OXYGEN SENSOR 2
O
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 P
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

Revision: August 2013 EC-243 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

15.CHECK INTERMITTENT INCIDENT

Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094948

1.INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK HEATED OXYGEN SENSOR 2
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

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5. Let engine idle for 1 minute.
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ±25%.

JSBIA3451ZZ

: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is −25%.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 6.
3.CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Check the voltage between ECM harness connector terminals
under the following conditions.

JMBIA1865ZZ

Revision: August 2013 EC-244 2014 Maxima NAM

 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ECM A

Con- + – Condition Voltage

nector Terminal Terminal
EC
33 The voltage should be
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35 Revving up to 4,000 C
dure.
F13 (Sensor rpm under no load at
34 The voltage should be
ground) least 10 times
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
D
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END E
NO >> GO TO 4.
4.CHECK HEATED OXYGEN SENSOR 2-II
F
Check the voltage between ECM harness connector terminals under
the following conditions.

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G
ECM

Con- + – Condition Voltage

nector Terminal Terminal H
33 The voltage should be
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35 I
Keeping engine at dure. JMBIA1866ZZ
F13 (Sensor
34 idle for 10 minutes The voltage should be
ground)
[HO2S2 below 0.18 V at least
(bank 2) once during this proce- J
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END K
NO >> GO TO 5.
5.CHECK HEATED OXYGEN SENSOR 2-III L
Check the voltage between ECM harness connector terminals under
the following conditions.
M
ECM

Con- + – Condition Voltage

nector Terminal Terminal N
33 The voltage should be
[HO2S2 above 0.78 V at least
(bank 1) once during this proce- O
signal] 35 Coasting from 80 km/
dure. JMBIA1867ZZ
F13 (Sensor h (50 MPH) in D posi-
34 The voltage should be
ground) tion
[HO2S2 below 0.18 V at least
(bank 2) once during this proce- P
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
Revision: August 2013 EC-245 2014 Maxima NAM
 P0138, P0158 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

cardiagn.com

Revision: August 2013 EC-246 2014 Maxima NAM

 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0139, P0159 HO2S2
A
Description INFOID:0000000010094949

The heated oxygen sensor 2, after three way catalyst (manifold), EC

monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2. C
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions. D
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
SEF327R E
DTC Logic INFOID:0000000010094950

DTC DETECTION LOGIC F

The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-

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gen storage capacity of the three way catalyst (manifold) causes the G
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the switching response of the sen-
sor's voltage is faster than specified during various driving conditions
H
such as fuel-cut.

I
SEF302U

J
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Heated oxygen sensor 2 • Harness or connectors K
P0139 (bank 1) circuit slow re- (The sensor circuit is open or shorted.)
sponse It takes more time for the sensor to respond be- • Heated oxygen sensor 2
Heated oxygen sensor 2 tween rich and lean than the specified time. • Fuel pressure
P0159 (bank 2) circuit slow re- • Fuel injector L
sponse • Intake air leakage

DTC CONFIRMATION PROCEDURE M

1.INSPECTION START
Do you have CONSULT?
Do you have CONSULT? N
YES >> GO TO 2.
NO >> GO TO 7.
O
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. P
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30°C (32 to 86°F).

>> GO TO 3.

Revision: August 2013 EC-247 2014 Maxima NAM

 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Make sure that “COOLAN TEMP/S” indicates more than 70°C (158°F).
9. Drive the vehicle in a proper gear at 60 km/h (38MPH) and maintain the speed.
CAUTION:
Always drive vehicle at a safe speed.
10. Release the accelerator pedal fully at least 5 seconds.
CAUTION:
• Enable the engine brake.
• Always drive carefully.
• Never apply brake when releasing the accelerator pedal.
11. Repeat step 9 and 10 at least 8 times.
12. Check the following item of “DATA MONITOR”.

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DTC Data monitor item Status
HO2 S2 DIAG1(B1)
P0139
HO2 S2 DIAG2(B1)
CMPLT
HO2 S2 DIAG1(B2)
P0159
HO2 S2 DIAG2(B2)
Is “CMPLT” displayed on CONSULT screen?
YES >> GO TO 6.
NO-1: “CMPLT” is not displayed on DIAG 1>>Perform DTC confirmation procedure again.
NO-2: “CMPLT” is not displayed on DIAG 2>>GO TO 4.
4.PERFORM DTC WORK SUPPORT
1. Open engine hood.
2. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT.
3. Start engine and follow the instruction of CONSULT display.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
Is “COMPLETED” displayed on CONSULT screen?
YES >> GO TO 6.
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2. Perform DTC confirmation procedure again.

>> GO TO 3.
6.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform ECM self-diagnosis.
Is DTC “P0139” or “P0159” detected?
YES >> Proceed to EC-250, "Diagnosis Procedure".
NO >> INSPECTION END
7.PERFORM COMPONENT FUNCTION CHECK
Revision: August 2013 EC-248 2014 Maxima NAM
 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Perform component function check. Refer to EC-249, "Component Function Check".
NOTE: A
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal? EC
YES >> INSPECTION END
NO >> Proceed to EC-250, "Diagnosis Procedure".
Component Function Check INFOID:0000000010094951 C

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.PERFORM COMPONENT FUNCTION CHECK-I D

Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds. E
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. F
6. Let engine idle for 1 minute.
7. Check the voltage between ECM harness connector terminals

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under the following conditions.
G

JMBIA1865ZZ

ECM
DTC Connec- + – Condition Voltage K
tor Terminal Terminal
33
P0139 [HO2S2 (bank 1) L
signal] 35 A change of voltage should be more
Revving up to 4,000 rpm under no
F13 (Sensor than 0.96 V for 1 second during this
34 load at least 10 times
ground) procedure.
P0159 [HO2S2 (bank 2) M
signal]
Is the inspection result normal?
YES >> INSPECTION END N
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK-II
O
Check the voltage between ECM harness connector terminals under
the following conditions.
P

JMBIA1866ZZ

Revision: August 2013 EC-249 2014 Maxima NAM

 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ECM
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33
P0139 [HO2S2 (bank 1)
signal] 35 A change of voltage should be more
F13 (Sensor Keeping engine at idle for 10 minutes than 0.96 V for 1 second during this
34 ground) procedure.
P0159 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector terminals under
the following conditions.

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JMBIA1867ZZ

ECM
DTC Connec- + – Condition Voltage
tor Terminal Terminal
33
P0139 [HO2S2 (bank 1)
signal] 35 A change of voltage should be more
Coasting from 80 km/h (50 MPH) in
F13 (Sensor than 0.96 V for 1 second during this
34 D position
ground) procedure.
P0159 [HO2S2 (bank 2)
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-250, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010094952

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CLEAR MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Run engine for at least 10 minutes at idle speed.
Revision: August 2013 EC-250 2014 Maxima NAM
 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-261, "DTC Logic" A
or EC-265, "DTC Logic".
NO >> GO TO 3.
3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT EC
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Disconnect ECM harness connector. C
4. Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness
connector.
D
HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
E
P0139 1 F62 1
F13 35 Existed
P0159 2 F56 1
5. Also check harness for short to ground and short to power. F
Is the inspection result normal?
YES >> GO TO 4.

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NO >> Repair open circuit, short to ground or short to power in harness or connectors. G
4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
H

HO2S2 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal I
P0139 1 F62 4 33
F13 Existed
P0159 2 F56 4 34
J
2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.

K
HO2S2
DTC Ground Continuity
Bank Connector Terminal
P0139 1 F62 4 L
Ground Not existed
P0159 2 F56 4

ECM
M
DTC Ground Continuity
Connector Terminal
P0139 33
F13 Ground Not existed N
P0159 34
3. Also check harness for short to power.
Is the inspection result normal? O
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK HEATED OXYGEN SENSOR 2 P

Refer to EC-252, "Component Inspection".

Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
Revision: August 2013 EC-251 2014 Maxima NAM
 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

7.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094953

1.INSPECTION START
Will CONSULT be used?

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Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK HEATED OXYGEN SENSOR 2
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ±25%.

JSBIA3451ZZ

: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is −25%.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 6.
3.CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.

Revision: August 2013 EC-252 2014 Maxima NAM

 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
5. Check the voltage between ECM harness connector terminals
under the following conditions. A

ECM
+ – Condition Voltage EC
Con-
nector Terminal Terminal
33 The voltage should be
[HO2S2
C
above 0.78 V at least
(bank 1) once during this proce-
signal] 35 Revving up to 4,000
dure. JMBIA1865ZZ
F13 (Sensor rpm under no load at
34 ground) least 10 times
The voltage should be D
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
signal] dure.
E
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 4. F
4.CHECK HEATED OXYGEN SENSOR 2-II
Check the voltage between ECM harness connector terminals under

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the following conditions. G

ECM
H
Con- + – Condition Voltage
nector Terminal Terminal
33 The voltage should be I
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35
Keeping engine at dure. JMBIA1866ZZ
F13 (Sensor J
34 idle for 10 minutes The voltage should be
ground)
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
signal] dure.
K
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5. L
5.CHECK HEATED OXYGEN SENSOR 2-III
Check the voltage between ECM harness connector terminals under
M
the following conditions.

ECM
N
Con- + – Condition Voltage
nector Terminal Terminal
33 The voltage should be O
[HO2S2 above 0.78 V at least
(bank 1) once during this proce-
signal] 35 Coasting from 80 km/
dure.
F13 (Sensor h (50 MPH) in D posi-
JMBIA1867ZZ
P
34 The voltage should be
ground) tion
[HO2S2 below 0.18 V at least
(bank 2) once during this proce-
signal] dure.

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 6.

Revision: August 2013 EC-253 2014 Maxima NAM

 P0139, P0159 HO2S2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

6.REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-
33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

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Revision: August 2013 EC-254 2014 Maxima NAM

 P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR
A
1
Description INFOID:0000000010094954
EC
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element. C
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range. D
The exhaust gas components diffuse via the diffusion layer at the
sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich. E
JMBIA0112GB

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this F
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C

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(1,472°F). G

PBIB3354E
I

DTC Logic INFOID:0000000010094955

J
DTC DETECTION LOGIC
To judge malfunctions, this diagnosis measures response time of the A/F signal computed by ECM from the A/
F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control con-
K
stant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F
signal cycling time index) is inordinately long or not.

DTC No. Trouble diagnosis name DTC detecting condition Possible Cause L
P014C Air fuel ratio (A/F) sensor 1
(bank 1) circuit slow re-
P014D sponse M
P015A Air fuel ratio (A/F) sensor 1
(bank 1) circuit delayed re- • Harness or connectors
P015B sponse • The response time of a A/F sensor 1 signal de-
(The A/F sensor 1 circuit is open or N
lays more than the specified time computed by
P014E Air fuel ratio (A/F) sensor 1 shorted.)
ECM.
(bank 2) circuit slow re- • A/F sensor 1
P014F sponse
O
P015C Air fuel ratio (A/F) sensor 1
(bank 2) circuit delayed re-
P015D sponse
P
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Revision: August 2013 EC-255 2014 Maxima NAM
 P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
Do you have CONSULT?
YES >> GO TO 2.
NO >> GO TO 6.
2.PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.
6. Let engine idle for 1 minute.
7. Increase the engine speed up to about 3,600 rpm and keep it for 10 seconds.
8. Fully release accelerator pedal and then let engine idle for about 1 minute.
9. Check the items status of “DATA MONITOR” as follows.
NOTE:
If “PRSNT” changed to “ABSNT”, refer to EC-220, "Component Function Check".

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DTC Data monitor item Status
• P014C
• P014D
A/F SEN1 DIAG3 (B1)
• P015A
• P015B
PRSNT
• P014E
• P014F
A/F SEN1 DIAG3 (B2)
• P015C
• P015D
Is “PRSNT” displayed on CONSULT screen?
YES >> GO TO 4.
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
Perform DTC confirmation procedure-1 again.
Is “PRSNT” displayed on CONSULT screen?
YES >> GO TO 4.
NO >> Refer to EC-220, "Component Function Check".
4.PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1. Wait for about 20 seconds at idle.
2. Check the items status of “DATA MONITOR” as follows.
NOTE:
If “CMPLT” changed to “INCMP”, refer to EC-220, "Component Function Check".

DTC Data monitor item Status

• P014C A/F SEN1 DIAG1 (B1)
• P014D
• P015A A/F SEN1 DIAG2 (B1)
• P015B
CMPLT
• P014E A/F SEN1 DIAG1 (B2)
• P014F
• P015C A/F SEN1 DIAG2 (B2)
• P015D
Is “CMPLT” displayed on CONSULT screen?

Revision: August 2013 EC-256 2014 Maxima NAM

 P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 5.
NO >> Refer to EC-220, "Component Function Check". A
5.PERFORM SELF-DIAGNOSIS
With CONSULT EC
Check the “SELF-DIAG RESULT”.
Is any DTC detected?
YES >> Proceed to EC-257, "Diagnosis Procedure". C
NO >> INSPECTION END
6.CHECK AIR-FUEL RATIO SELF-LEARNING VALUE
With GST D
1. Start engine and warm it up to normal operating temperature.
2. Select Service $01 with GST.
3. Calculate the total value of “Short term fuel trim” and “Long term fuel trim” indications. E
Is the total percentage within ±15%?
YES >> GO TO 8.
NO >> GO TO 7. F
7.DETECT MALFUNCTIONING PART

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Check the following.
G
• Intake air leaks
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel H
• Fuel injector
• Incorrect PCV hose connection
• PCV valve I
• Mass air flow sensor

>> Repair or replace malfunctioning part. J

8.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. K
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute. L
6. Increase the engine speed up to about 3,600 rpm and keep it for 10 seconds.
7. Fully release accelerator pedal and then let engine idle for about 1 minute.
8. Check 1st trip DTC.
M
Is 1st trip DTC detected?
YES >> Proceed to EC-257, "Diagnosis Procedure".
NO >> INSPECTION END
N
Diagnosis Procedure INFOID:0000000010094956

1.RETIGHTEN A/F SENSOR 1 O

Loosen and retighten the A/F sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-33,
"Removal and Installation (RH)" (RH).
P
>> GO TO 2.
2.CHECK EXHAUST GAS LEAKAGE
1. Start engine and run it at idle.

Revision: August 2013 EC-257 2014 Maxima NAM

 P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Listen for an exhaust gas leakage before three way catalyst (manifold).

PBIB1216E

Is exhaust gas leakage detected?

YES >> Repair or replace.
NO >> GO TO 3.
3.CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES >> Repair or replace.
NO >> GO TO 4.
4.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

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1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-261, "DTC Logic"
or EC-265, "DTC Logic".
NO >> GO TO 5.
5.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and
ground.

A/F sensor 1
DTC Ground Voltage
Bank Connector Terminal
• P014C
• P014D
1 F12 4
• P015A
• P015B
Ground Battery voltage
• P014E PBIB3308E
• P014F
2 F61 4
• P015C
• P015D
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

Revision: August 2013 EC-258 2014 Maxima NAM

 P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

A/F sensor 1 IPDM E/R A

DTC Continuity
Bank Connector Terminal Connector Terminal
• P014C
• P014D EC
1 F12 4
• P015A
• P015B
F10 57 Existed
• P014E C
• P014F
2 F61 4
• P015C
• P015D
D
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts. E
7.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. F
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

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A/F sensor 1 ECM G
DTC Continuity
Bank Connector Terminal Connector Terminal
• P014C 1 45
• P014D H
1 F12
• P015A 2 49
• P015B
F13 Existed
• P014E 1 53 I
• P014F
2 F61
• P015C 2 57
• P015D
J
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
K
A/F sensor 1
DTC Ground Continuity
Bank Connector Terminal
• P014C 1 L
• P014D
1 F12
• P015A 2
• P015B
Ground Not existed M
• P014E 1
• P014F
2 F61
• P015C 2
• P015D N

ECM
DTC Ground Continuity O
Bank Connector Terminal
• P014C 45
• P014D
1 P
• P015A 49
• P015B
F13 Ground Not existed
• P014E 53
• P014F
2
• P015C 57
• P015D
5. Also check harness for short to power.

Revision: August 2013 EC-259 2014 Maxima NAM

 P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Check air fuel ratio (A/F) sensor 1 heater. Refer to EC-172, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation
(LH)" (LH) or EM-33, "Removal and Installation (RH)" (RH).
9.CHECK MASS AIR FLOW SENSOR
Check both mass air flow sensor (bank 1 and bank 2).
Refer to EC-185, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace mass air flow sensor. Refer to EM-24, "Removal and Installation".
10.CHECK PCV VALVE
Check PCV valve. Refer to EC-514, "Component Inspection".

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Is the inspection result normal?
YES >> GO TO 11.
NO >> Repair or replace PCV valve.
11.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation
(LH)" (LH) or EM-33, "Removal and Installation (RH)" (RH).
NO >> Repair or replace error-detected parts.

Revision: August 2013 EC-260 2014 Maxima NAM

 P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
A
DTC Logic INFOID:0000000010094957

DTC DETECTION LOGIC EC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates
the necessary compensation to correct the offset between the actual and the theoretical ratios. C
In case the amount of the compensation value is extremely large (the actual mixture ratio is too lean), the
ECM judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection
logic).
D
Sensor Input signal to ECM ECM function Actuator
Density of oxygen in exhaust gas
A/F sensor 1 Fuel injection control Fuel injector E
(Mixture ratio feedback signal)

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
F
Fuel injection system too • Intake air leakage
P0171
lean (bank 1) • A/F sensor 1
• Fuel injector

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• Fuel injection system does not operate properly.
• Exhaust gas leakage G
• The amount of mixture ratio compensation is too
Fuel injection system too • Incorrect fuel pressure
P0174 large. (The mixture ratio is too lean.)
lean (bank 2) • Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection H

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING I
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. J
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
K
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I L
1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Start engine.
M
Is it difficult to start engine?
YES >> GO TO 3.
NO >> GO TO 4.
N
3.RESTART ENGINE
If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal. O
NOTE:
• When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
P
Does engine start?
YES >> Go to EC-262, "Diagnosis Procedure".
NO >> Check exhaust and intake air leakage visually.
4.PERFORM DTC CONFIRMATION PROCEDURE-II
1. Keep engine idle for at least 5 minutes.
2. Check 1st trip DTC.

Revision: August 2013 EC-261 2014 Maxima NAM

 P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is 1st trip DTC detected?
YES >> Go to EC-262, "Diagnosis Procedure".
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine.
3. Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.

VHCL SPEED SE 50 - 120 km/h (31 - 75 mph)

CAUTION:
Always drive vehicle at a safe speed.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-262, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094958

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

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1.CHECK EXHAUST GAS LEAKAGE
1. Start engine and run it at idle.
2. Listen for an exhaust gas leakage before three way catalyst (manifold).

PBIB1216E

Is exhaust gas leakage detected?

YES >> Repair or replace malfunctioning part.
NO >> GO TO 2.
2.CHECK FOR INTAKE AIR LEAKAGE
1. Listen for an intake air leakage after the mass air flow sensor.
2. Check PCV hose connection.
Is intake air leakage detected?
YES >> Repair or replace malfunctioning part.
NO >> GO TO 3.
3.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect corresponding A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

Revision: August 2013 EC-262 2014 Maxima NAM

 P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

A/F sensor 1 ECM A

DTC Continuity
Bank Connector Terminal Connector Terminal
1 45
P0171 1 F12 EC
2 49
F13 Existed
1 53
P0174 2 F61
2 57 C
5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
D
A/F sensor 1
DTC Ground Continuity
Bank Connector Terminal
E
1
P0171 1 F12
2
Ground Not existed
1 F
P0174 2 F61
2

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G
ECM
DTC Ground Continuity
Connector Terminal
45 H
P0171
49
F13 Ground Not existed
53
P0174 I
57
6. Also check harness for short to power.
Is the inspection result normal? J
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL PRESSURE K
1. Release fuel pressure to zero. Refer to EC-592, "Inspection".
2. Install fuel pressure gauge kit [SST (J-44321)] and check fuel pressure. Refer to EC-592, "Inspection".
L
2
At idling: Approximately 350 kPa (3.57 kg/cm , 51 psi)
Is the inspection result normal?
M
YES >> GO TO 6.
NO >> GO TO 5.
5. DETECT MALFUNCTIONING PART N
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly”. Refer to FL-6, "Removal and Installation". O
NO >> Repair or replace malfunctioning part.
6.CHECK MASS AIR FLOW SENSOR P
With CONSULT
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT.
For specification, refer to EC-596, "Mass Air Flow Sensor".
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in Service $01 with GST.

Revision: August 2013 EC-263 2014 Maxima NAM

 P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
For specification, refer to EC-596, "Mass Air Flow Sensor".
Is the measurement value within the specification?
YES >> GO TO 7.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-190, "Diagnosis Procedure".
7.CHECK FUNCTION OF FUEL INJECTOR
With CONSULT
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
3. Check that each circuit produces a momentary engine speed drop.
With GST
1. Let engine idle.
2. Listen to each fuel injector operating sound.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to
EC-496, "Diagnosis Procedure".

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PBIB3332E

8.CHECK FUEL INJECTOR

1. Turn ignition switch OFF.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect all fuel injector harness connectors.
4. Remove fuel tube assembly. Refer to EM-43, "Removal and Installation".
Keep fuel hose and all fuel injectors connected to fuel tube.
5. For DTC P0171, reconnect fuel injector harness connectors on bank 1.
For DTC P0174, reconnect fuel injector harness connectors on bank 2.
6. Disconnect all ignition coil harness connectors.
7. Prepare pans or saucers under each fuel injector.
8. Crank engine for about 3 seconds.
For DTC P0171, check that fuel sprays out from fuel injectors on bank 1.
For DTC P0174, check that fuel sprays out from fuel injectors on bank 2.

Fuel should be sprayed evenly for each fuel injector.

Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace fuel injectors from which fuel does not spray out. Refer to EM-43, "Removal and Installa-
tion". Always replace O-ring with new ones.
9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Revision: August 2013 EC-264 2014 Maxima NAM

 P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
A
DTC Logic INFOID:0000000010094959

DTC DETECTION LOGIC EC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates
the necessary compensation to correct the offset between the actual and the theoretical ratios. C
In case the amount of the compensation value is extremely large (the actual mixture ratio is too rich), the ECM
judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection logic).

Sensor Input signal to ECM ECM function Actuator D

Density of oxygen in exhaust gas
A/F sensor 1 Fuel injection control Fuel injector
(Mixture ratio feedback signal)
E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Fuel injection system too • A/F sensor 1 F
P0172
rich (bank 1) • Fuel injection system does not operate properly. • Fuel injector
• The amount of mixture ratio compensation is too • Exhaust gas leakage
Fuel injection system too large. (The mixture ratio is too rich.) • Incorrect fuel pressure

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P0175
rich (bank 2) • Mass air flow sensor G
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING H
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. I
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
J
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
K
1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Start engine.
Is it difficult to start engine? L
YES >> GO TO 3.
NO >> GO TO 4.
3.RESTART ENGINE M

If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal. N
NOTE:
• When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
Does engine start? O
YES >> Go to EC-266, "Diagnosis Procedure".
NO >> Remove spark plugs and check for fouling, etc. Refer to EM-12, "Removal and Installation".
4.PERFORM DTC CONFIRMATION PROCEDURE-II P

1. Keep engine idle for at least 10 minutes.

2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-266, "Diagnosis Procedure".
NO >> GO TO 5.

Revision: August 2013 EC-265 2014 Maxima NAM

 P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

5.PERFORM DTC CONFIRMATION PROCEDURE-III

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine.
3. Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.

VHCL SPEED SE 50 - 120 km/h (31 - 75 mph)

CAUTION:
Always drive vehicle at a safe speed.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-266, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094960

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK EXHAUST GAS LEAKAGE
1. Start engine and run it at idle.

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2. Listen for an exhaust gas leakage before three way catalyst (manifold).

PBIB1216E

Is exhaust gas leakage detected?

YES >> Repair or replace malfunctioning part.
NO >> GO TO 2.
2.CHECK FOR INTAKE AIR LEAKAGE
Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES >> Repair or replace malfunctioning part.
NO >> GO TO 3.
3.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect corresponding A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

A/F sensor 1 ECM

DTC Continuity
Bank Connector Terminal Connector Terminal
1 45
P0172 1 F12
2 49
F13 Existed
1 53
P0175 2 F61
2 57
5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

Revision: August 2013 EC-266 2014 Maxima NAM

 P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

A/F sensor 1 A
DTC Ground Continuity
Bank Connector Terminal
1
P0172 1 F12 EC
2
Ground Not existed
1
P0175 2 F61
2 C

ECM
DTC Ground Continuity D
Connector Terminal
45
P0172
49 E
F13 Ground Not existed
53
P0175
57
F
6. Also check harness for short to power.
Is the inspection result normal?

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YES >> GO TO 4. G
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-592, "Inspection". H
2. Install fuel pressure gauge kit [SST (J-44321)] and check fuel pressure. Refer to EC-592, "Inspection".

At idling: Approximately 350 kPa (3.57 kg/cm2, 51 psi) I

Is the inspection result normal?
YES >> GO TO 5.
J
NO >> Replace “fuel filter and fuel pump assembly”. Refer to FL-6, "Removal and Installation".
5.CHECK MASS AIR FLOW SENSOR
With CONSULT K
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT.
For specification, refer to EC-596, "Mass Air Flow Sensor". L
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in “Service $01” with GST.
For specification, refer to EC-596, "Mass Air Flow Sensor". M
Is the measurement value within the specification?
YES >> GO TO 6.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or N
ground. Refer to EC-190, "Diagnosis Procedure".
6.CHECK FUNCTION OF FUEL INJECTOR O
With CONSULT
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT. P
3. Check that each circuit produces a momentary engine speed drop.
With GST
1. Let engine idle.

Revision: August 2013 EC-267 2014 Maxima NAM

 P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Listen to each fuel injector operating sound.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to
EC-496, "Diagnosis Procedure".

PBIB3332E

7.CHECK FUEL INJECTOR

1. Remove fuel injector assembly. Refer to EM-43, "Removal and Installation".
Keep fuel hose and all fuel injectors connected to fuel tube.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect all fuel injector harness connectors.
4. Disconnect all ignition coil harness connectors.
5. Prepare pans or saucers under each fuel injector.
6. Crank engine for about 3 seconds.
Check that fuel does not drip from fuel injector.

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Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace the fuel injectors from which fuel is dripping. Refer to EM-43, "Removal and Installation".
Always replace O-ring with new one.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Revision: August 2013 EC-268 2014 Maxima NAM

 P0181 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0181 FTT SENSOR
A
Description INFOID:0000000010094961

The fuel tank temperature sensor is used to detect the fuel tempera- EC
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor C
decreases as temperature increases.
<Reference data>
D
Fluid temperature Voltage* Resistance
[°C (°F)] (V) (kΩ)
20 (68) 3.5 2.3 - 2.7 SEF012P E
50 (122) 2.2 0.79 - 0.90
*: These data are reference values and are measured between ECM terminals 95 (Fuel tank temperature sensor) and 104 (sensor
ground). F

DTC Logic INFOID:0000000010094962

cardiagn.com
G
DTC DETECTION LOGIC

Trouble diagnosis
DTC No. DTC detecting condition Possible cause H
(Trouble diagnosis content)
• Harness or connectors
Rationally incorrect voltage from the
(The FTT sensor circuit is open or
sensor is sent to ECM, compared with I
A) shorted)
the voltage signals from ECT sensor
• FTT sensor
and intake air temperature sensor.
• Combination meter
FTT SENSOR
[Fuel tank temperature (FTT) The comparison result of signals trans- J
P0181 mitted to ECM from each temperature
sensor circuit range/perfor-
mance] sensor (IAT sensor, ECT sensor, EOT • Harness or connectors
sensor, and FTT sensor) shows that (High or low resistance in the FTT
B) K
the voltage signal of the FTT sensor is sensor circuit)
higher/lower than that of other temper- • FTT sensor
ature sensors when the engine is start-
ed with its cold state.
L
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
M

Is it necessary to erase permanent DTC?

YES >> GO TO 7. N
NO >> GO TO 2.
2.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce- O
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. P
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-I
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check 1st trip DTC.

Revision: August 2013 EC-269 2014 Maxima NAM

 P0181 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is 1st trip DTC detected?
YES >> Proceed to EC-271, "Diagnosis Procedure".
NO >> GO TO 4.
4.CHECK ENGINE COOLANT TEMPERATURE
With CONSULT
1. Select “COOLAN TEMP/S” in “DATA MONITOR” with CONSULT.
2. Check “COOLAN TEMP/S” value.
With GST
Follow the procedure “With CONSULT” above.
“COOLAN TEMP/S” less than 60°C (140°F)?
YES >> INSPECTION END
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-II
With CONSULT
1. Cool engine down until “COOLAN TEMP/S” is less than 60°C (140°F).
2. Wait at least 10 seconds.
3. Check 1st trip DTC.
With GST

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Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-271, "Diagnosis Procedure".
NO >> GO TO 6.
6.PERFORM COMPONENT FUNCTION CHECK (FOR MALFUNCTION B)
Perform component function check. Refer to EC-271, "Component Function Check".
NOTE:
Use the component function check to check the overall function of the FTT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-271, "Diagnosis Procedure".
7.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
• Before performing the following procedure, do not add fuel.
• Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 8.
8.PERFORM DTC CONFIRMATION PROCEDURE B
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between −10°C (14°F) and 35°C (95°F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 5 minutes or more.

Revision: August 2013 EC-270 2014 Maxima NAM

 P0181 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
CAUTION:
Never turn ignition switch OFF during idling. A
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-271, "Diagnosis Procedure". EC
NO >> INSPECTION END
Component Function Check INFOID:0000000010094963
C
1.CHECK FUEL TANK TEMPERATURE (FTT) SENSOR
1. Turn ignition switch OFF.
D
2. Disconnect fuel level sensor unit and fuel pump harness connector.
3. Remove fuel level sensor unit. Refer to FL-6, "Removal and Installation".
4. Check resistance between fuel level sensor unit and fuel pump
terminals by heating with hot water as shown in the figure. E

Terminals Condition Resistance (kΩ)

20 (68) 2.3 – 2.7 F
4 and 5 Temperature [°C (°F)]
50 (122) 0.79 – 0.90

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Is the inspection result normal? G
YES >> GO TO 2.
NO >> Proceed to EC-271, "Diagnosis Procedure".
JMBIA0167ZZ

2.CHECK INTERMITTENT INCIDENT H

Check intermittent incident. Refer to GI-41, "Intermittent Incident".

Is the inspection result normal? I
YES >> INSPECTION END
NO >> Proceed to EC-271, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010094964
J

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.INSPECTION START K

Confirm the detected malfunction (A or B). Refer to EC-269, "DTC Logic".

Which malfunction is detected? L
A >> GO TO 2.
B >> GO TO 7.
2.CHECK GROUND CONNECTION M
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal? N
YES >> GO TO 3.
NO >> Repair or replace ground connection.
3.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT O

1. Turn ignition switch OFF.

2. Disconnect “fuel level sensor unit and fuel pump” harness connector. P
3. Turn ignition switch ON.

Revision: August 2013 EC-271 2014 Maxima NAM

 P0181 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check the voltage between “fuel level sensor unit and fuel
pump” harness connector and ground.

Fuel level sensor unit and fuel pump

Ground Voltage
Connector Terminal
B42 4 Ground Approx. 5 V
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
PBIB0932E

4.DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors B10, E29
• Harness for open or short between ECM and “fuel level sensor unit and fuel pump”

>> Repair open circuit, short to ground or short to power in harness or connector.
5.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.

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2. Disconnect ECM harness connector.
3. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ECM harness
connector.

Fuel level sensor unit and fuel pump ECM

Continuity
Connector Terminal Connector Terminal
B42 5 E10 104 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B1, M6
• Harness connectors E30, M1
• Harness for open or short between “fuel level sensor unit and fuel pump” and ECM

>> Repair open circuit, short to ground or short to power in harness or connector.
7.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-272, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace “fuel level sensor unit and fuel pump”. Refer to FL-6, "Removal and Installation".
8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094965

1.CHECK FUEL TANK TEMPERATURE SENSOR

1. Turn ignition switch OFF.

Revision: August 2013 EC-272 2014 Maxima NAM

 P0181 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Remove fuel level sensor unit. Refer to FL-6, "Removal and Installation".
3. Check resistance between “fuel level sensor unit and fuel pump” A
terminals by heating with hot water as shown in the figure.

Terminals Condition Resistance EC

20 (68) 2.3 - 2.7 kΩ
4 and 5 Temperature [°C (°F)]
50 (122) 0.79 - 0.90 kΩ
C
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-6, "Removal and Installation". PBIB0931E D

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G

Revision: August 2013 EC-273 2014 Maxima NAM

 P0182, P0183 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0182, P0183 FTT SENSOR
Description INFOID:0000000010094966

The fuel tank temperature sensor is used to detect the fuel tempera-
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.
<Reference data>

Fluid temperature Voltage* Resistance

[°C (°F)] (V) (kΩ)
20 (68) 3.5 2.3 - 2.7 SEF012P

50 (122) 2.2 0.79 - 0.90

*: These data are reference values and are measured between ECM terminals 95 (Fuel tank temperature sensor) and 104 (sensor
ground).

DTC Logic INFOID:0000000010094967

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DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Fuel tank temperature An excessively low voltage from the sensor is
P0182 • Harness or connectors
sensor circuit low input sent to ECM.
(The sensor circuit is open or shorted.)
Fuel tank temperature An excessively high voltage from the sensor is • Fuel tank temperature sensor
P0183
sensor circuit high input sent to ECM.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-274, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094968

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.

Revision: August 2013 EC-274 2014 Maxima NAM

 P0182, P0183 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT A

1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Turn ignition switch ON.
EC
4. Check the voltage between “fuel level sensor unit and fuel
pump” harness connector and ground.

Fuel level sensor unit and fuel pump

C
Ground Voltage
Connector Terminal
B42 4 Ground Approx. 5 V D
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3. E
PBIB0932E

3.DETECT MALFUNCTIONING PART

Check the following. F
• Harness connectors B10, E29
• Harness for open or short between ECM and “fuel level sensor unit and fuel pump”

cardiagn.com
G
>> Repair open circuit, short to ground or short to power in harness or connector.
4.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
H
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ECM harness
connector. I

Fuel level sensor unit and fuel pump ECM

Continuity J
Connector Terminal Connector Terminal
B42 5 E10 104 Existed
4. Also check harness for short to ground and short to power. K
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5. L
5.DETECT MALFUNCTIONING PART
Check the following.
M
• Harness connectors B1, M6
• Harness connectors E30, M1
• Harness for open or short between “fuel level sensor unit and fuel pump” and ECM
N
>> Repair open circuit, short to ground or short to power in harness or connector.
6.CHECK FUEL TANK TEMPERATURE SENSOR O
Refer to EC-276, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7. P
NO >> Replace “fuel level sensor unit and fuel pump”. Refer to FL-6, "Removal and Installation".
7.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Revision: August 2013 EC-275 2014 Maxima NAM

 P0182, P0183 FTT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Component Inspection INFOID:0000000010094969

1.CHECK FUEL TANK TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Remove fuel level sensor unit. Refer to FL-6, "Removal and Installation".
3. Check resistance between “fuel level sensor unit and fuel pump”
terminals by heating with hot water as shown in the figure.

Terminals Condition Resistance

20 (68) 2.3 - 2.7 kΩ
4 and 5 Temperature [°C (°F)]
50 (122) 0.79 - 0.90 kΩ
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-6, "Removal and Installation". PBIB0931E

cardiagn.com

Revision: August 2013 EC-276 2014 Maxima NAM

 P0196 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0196 EOT SENSOR
A
Description INFOID:0000000010094970

The engine oil temperature sensor is used to detect the engine oil EC
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor C
decreases as temperature increases.

SEF594K E

<Reference data>
F
Engine oil temperature
Voltage* (V) Resistance (kΩ)
[°C (°F)]

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–10 (14) 4.4 7.0 - 11.4 G
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
H
90 (194) 0.9 0.236 - 0.260
110 (230) 0.6 0.143 - 0.153
SEF012P

*: These data are reference values and are measured between ECM terminals 54 I
(Engine oil temperature sensor) and 52 (Sensor ground).

DTC Logic INFOID:0000000010094971

J
DTC DETECTION LOGIC
NOTE:
If DTC P0196 is displayed with DTC P0197 or P0198, first perform the trouble diagnosis for DTC P0197 or K
P0198. Refer to EC-281, "DTC Logic".

Trouble diagnosis L
DTC No. DTC detecting condition Possible cause
(Trouble diagnosis content)
Rationally incorrect voltage from the • Harness or connectors
sensor is sent to ECM, compared with (The EOT sensor circuit is open or
A) M
the voltage signals from EOT sensor shorted)
and intake air temperature sensor. • EOT sensor
EOT SENSOR The comparison result of signals trans-
[Engine oil temperature (EOT) mitted to ECM from each temperature N
P0196
sensor circuit range/perfor- sensor (IAT sensor, ECT sensor, FTT • Harness or connectors
mance] sensor, and EOT sensor) shows that the (High or low resistance in the EOT
B)
signal voltage of the EOT sensor is high- sensor circuit)
er/lower than that of other temperature • EOT sensor O
sensors when the engine is started with
its cold state.

DTC CONFIRMATION PROCEDURE P

1.INSPECTION START
Is it necessary to erase permanent DTC?
YES >> GO TO 6.
NO >> GO TO 2.

Revision: August 2013 EC-277 2014 Maxima NAM

 P0196 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MULFUNCTION A-I
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and let it idle for 5 minutes and 10 seconds.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-280, "Diagnosis Procedure".

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NO >> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE FOR MULFUNCTION A-II
With CONSULT
1. Select “DATA MONITOR” mode with CONSULT.
2. Check that “COOLAN TEMP/S” indicates above 80°C (176°F).
If it is above 80°C (176°F), go to the following steps.
If it is below 80°C (176°F), warm engine up until “COOLAN TEMP/S” indicates more than 80°C (176°F).
Then perform the following steps.
3. Turn ignition switch OFF and soak the vehicle in a cool place.
4. Turn ignition switch ON.
NOTE:
Do not turn ignition switch OFF until step 8.
5. Select “DATA MONITOR” mode with CONSULT.
6. Check the following.

COOLAN TEMP/S Below 40°C (104°F)

INT/A TEMP SE Below 40°C (104°F)
Difference between “COOLAN TEMP/S” and “INT/A TEMP SE” Within 6°C (11°F)
If they are within the specified range, perform the following steps.
If they are out of the specified range, soak the vehicle to meet the above conditions. Then perform the fol-
lowing steps.
NOTE:
• Do not turn ignition switch OFF.
• If it is supposed to need a long period of time, do not deplete the battery.
7. Start engine and let it idle for 5 minutes.
8. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-280, "Diagnosis Procedure".
NO >> GO TO 5.
5.PERFORM COMPONENT FUNCTION CHECK (FOR MULFUNCTION B)
Perform component function check. Refer to EC-280, "Component Inspection".
NOTE:

Revision: August 2013 EC-278 2014 Maxima NAM

 P0196 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Use the component function check to check the overall function of the EOT sensor circuit. During this check, a
1st trip DTC might not be confirmed. A
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-280, "Diagnosis Procedure". EC
6. PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
C
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. D
TESTING CONDITION:
• Before performing the following procedure, do not add fuel.
• Before performing the following procedure, check that fuel level is between 1/4 and 4/4. E
• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 7. F
7.PERFORM DTC CONFIRMATION PROCEDURE B
1. Start engine and let it idle for 60 minutes.

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2. Move the vehicle to a cool place. G
NOTE:
Cool the vehicle in an environment of ambient air temperature between −10°C (14°F) and 35°C (95°F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours. H
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open. I
4. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling. J
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-280, "Diagnosis Procedure". K
NO >> INSPECTION END
Component Function Check INFOID:0000000010094972
L
1.CHECK ENGINE OIL TEMPERATURE (EOT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect EOT sensor harness connector. M
3. Remove EOT sensor. Refer to EC-38, "Component Parts Location".
4. Check resistance between EOT sensor terminals by heating
with hot water as shown in the figure. N

Terminals Condition Resistance (kΩ)

20 (68) 2.1 – 2.9 O
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 – 1.00
90 (194) 0.236 – 0.260
P
Is the inspection result normal?
YES >> GO TO 2. JMBIA0080ZZ
NO >> Proceed to EC-280, "Diagnosis Procedure".
2.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?

Revision: August 2013 EC-279 2014 Maxima NAM

 P0196 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> INSPECTION END
NO >> Proceed to EC-280, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010094973

1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK ENGINE OIL TEMPERATURE SENSOR
Refer to EC-280, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace engine oil temperature sensor. Refer to EC-38, "Component Parts Location".
3.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

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>> INSPECTION END
Component Inspection INFOID:0000000010094974

1.CHECK ENGINE OIL TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Disconnect engine oil temperature sensor harness connector.
3. Remove engine oil temperature sensor.
4. Check resistance between engine oil temperature sensor termi-
nals by heating with hot water as shown in the figure.

Terminals Condition Resistance

20 (68) 2.1 - 2.9 kΩ
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 - 1.00 kΩ
90 (194) 0.236 - 0.260 kΩ
Is the inspection result normal?
YES >> INSPECTION END PBIB2005E
NO >> Replace engine oil temperature sensor. Refer to .EC-38,
"Component Parts Location"

Revision: August 2013 EC-280 2014 Maxima NAM

 P0197, P0198 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0197, P0198 EOT SENSOR
A
Description INFOID:0000000010094975

The engine oil temperature sensor is used to detect the engine oil EC
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor C
decreases as temperature increases.

SEF594K E

<Reference data>
F
Engine oil temperature
Voltage* (V) Resistance (kΩ)
[°C (°F)]

cardiagn.com
–10 (14) 4.4 7.0 - 11.4 G
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
H
90 (194) 0.9 0.236 - 0.260
110 (230) 0.6 0.143 - 0.153
SEF012P

*: These data are reference values and are measured between ECM terminals 54 I
(Engine oil temperature sensor) and 52 (Sensor ground).

DTC Logic INFOID:0000000010094976

J
DTC DETECTION LOGIC

Trouble Diagnosis K
DTC No. DTC detecting condition Possible Cause
Name
Engine oil tempera-
An excessively low voltage from the sensor is
P0197 ture sensor circuit low L
sent to ECM. • Harness or connectors
input
(The sensor circuit is open or shorted.)
Engine oil tempera- • Engine oil temperature sensor
An excessively high voltage from the sensor is
P0198 ture sensor circuit
sent to ECM. M
high input

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING N

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. O
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
P
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?

Revision: August 2013 EC-281 2014 Maxima NAM

 P0197, P0198 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> Go to EC-282, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094977

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK EOT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine oil temperature (EOT) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between EOT sensor harness connector and
ground.

EOT sensor

cardiagn.com
Ground Voltage
Connector Terminal
F68 1 Ground Approx. 5 V
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIB0080E

3.CHECK EOT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between EOT sensor harness connector and ECM harness connector.

EOT sensor ECM

Continuity
Connector Terminal Connector Terminal
F68 2 F13 52 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK ENGINE OIL TEMPERATURE SENSOR
Refer to EC-282, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace engine oil temperature sensor. Refer to EC-38, "Component Parts Location".
5.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094978

1.CHECK ENGINE OIL TEMPERATURE SENSOR

1. Turn ignition switch OFF.
Revision: August 2013 EC-282 2014 Maxima NAM
 P0197, P0198 EOT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect engine oil temperature sensor harness connector.
3. Remove engine oil temperature sensor. A
4. Check resistance between engine oil temperature sensor termi-
nals by heating with hot water as shown in the figure.
EC
Terminals Condition Resistance
20 (68) 2.1 - 2.9 kΩ
1 and 2 Temperature [°C (°F)] 50 (122) 0.68 - 1.00 kΩ C
90 (194) 0.236 - 0.260 kΩ
Is the inspection result normal?
D
YES >> INSPECTION END PBIB2005E
NO >> Replace engine oil temperature sensor. Refer to .EC-38,
"Component Parts Location"
E

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G

Revision: August 2013 EC-283 2014 Maxima NAM

 P0222, P0223 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0222, P0223 TP SENSOR
Description INFOID:0000000010094979

Electric throttle control actuator consists of throttle control motor,

throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

PBIB0145E

DTC Logic INFOID:0000000010094980

DTC DETECTION LOGIC

NOTE:
If DTC P0222 or P0223 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

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Refer to EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Throttle position sensor An excessively low voltage from the TP sensor • Harness or connectors
P0222
1 circuit low input 1 is sent to ECM. (The sensor circuit is open or shorted.)
Throttle position sensor An excessively high voltage from the TP sensor • Electric throttle control actuator
P0223 (Throttle position sensor 1)
1 circuit high input 1 is sent to ECM.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-284, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094981

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.

Revision: August 2013 EC-284 2014 Maxima NAM

 P0222, P0223 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Repair or replace ground connection.
2.CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I A

1. Disconnect electric throttle control actuator harness connector.

2. Turn ignition switch ON.
EC
3. Check the voltage between electric throttle control actuator har-
ness connector and ground.

Electric throttle control actuator

C
Ground Voltage
Connector Terminal
F57 1 Ground Approx. 5 V D
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in E
harness or connectors. PBIB3484E

3.CHECK THROTTLE POSITION SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
F
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator and ECM harness connector.

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G
Electric throttle control actuator ECM
Continuity
Connector Terminal Connector Terminal
H
F57 4 F13 36 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal? I
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK THROTTLE POSITION SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT J

1. Check the continuity between electric throttle control actuator and ECM harness connector.
K
Electric throttle control actuator ECM
Continuity
Connector Terminal Connector Terminal
F57 2 F13 37 Existed L
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
M
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK THROTTLE POSITION SENSOR N
Refer to EC-286, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7. O
NO >> GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
P
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

>> INSPECTION END

7.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

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 P0222, P0223 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

>> INSPECTION END

Component Inspection INFOID:0000000010094982

1.CHECK THROTTLE POSITION SENSOR

1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Perform EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
4. Turn ignition switch ON.
5. Set selector lever to D position.
6. Check the voltage between ECM harness connector terminals
under the following conditions.

ECM

Con- + – Condition Voltage

nector Terminal Terminal
37 Fully released More than 0.36 V
(TP sensor
36 Fully depressed Less than 4.75 V

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1 signal) Accelera-
F13 (Sensor
38 tor pedal Fully released Less than 4.75 V JMBIA1864ZZ
ground)
(TP sensor
2 signal) Fully depressed More than 0.36 V

Is the inspection result normal?

YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Go to EC-413, "Special Repair Requirement".

>> INSPECTION END

Special Repair Requirement INFOID:0000000010094983

1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

Revision: August 2013 EC-286 2014 Maxima NAM

 P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
A
DTC Logic INFOID:0000000010094984

DTC DETECTION LOGIC EC

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-
shaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.
C
Sensor Input signal to ECM ECM function
Crankshaft position sensor (POS) Engine speed On board diagnosis of misfire
The misfire detection logic consists of the following two conditions. D
1. One Trip Detection Logic (Three Way Catalyst Damage)
On the 1st trip, when a misfire condition occurs that can damage the three way catalyst (TWC) due to
overheating, the MIL will blink. E
When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions
for a change.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.
F
If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.
If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.

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2. Two Trip Detection Logic (Exhaust quality deterioration) G
For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only
light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sen-
sor signal every 1,000 engine revolutions. H
A misfire malfunction can be detected in any one cylinder or in multiple cylinders.

DTC No. Trouble diagnosis name DTC detecting condition Possible cause I
P0300 Multiple cylinder misfires detected Multiple cylinder misfire. • Improper spark plug
• Insufficient compression
P0301 No. 1 cylinder misfire detected No. 1 cylinder misfires.
• Incorrect fuel pressure J
P0302 No. 2 cylinder misfire detected No. 2 cylinder misfires. • The fuel injector circuit is open or shorted
• Fuel injector
P0303 No. 3 cylinder misfire detected No. 3 cylinder misfires.
• Intake air leakage
P0304 No. 4 cylinder misfire detected No. 4 cylinder misfires. • The ignition signal circuit is open or shorted K
P0305 No. 5 cylinder misfire detected No. 5 cylinder misfires. • Lack of fuel
• Signal plate
• A/F sensor 1
P0306 No. 6 cylinder misfire detected No. 6 cylinder misfires.
• Incorrect PCV hose connection L

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING M
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. N
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
O
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
P
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Restart engine and let it idle for about 15 minutes.
6. Check 1st trip DTC.
Is 1st trip DTC detected?

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 P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> Go to EC-288, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and drive the vehicle under similar conditions to (1st trip) Freeze Frame Data for a certain
time. Refer to the table below.
Hold the accelerator pedal as steady as possible.
Similar conditions to (1st trip) Freeze Frame Data mean that the following conditions should be satisfied at
the same time.
CAUTION:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when
driving.

Engine speed Engine speed in the freeze frame data ± 400 rpm
Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
Basic fuel schedule Basic fuel schedule in freeze frame data × (1 ± 0.1)
When the freeze frame data shows lower than 70 °C (158 °F),

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Engine coolant temperature (T) T should be lower than 70 °C (158 °F).
condition When the freeze frame data shows higher than or equal to 70 °C (158 °F),
T should be higher than or equal to 70 °C (158 °F).
Driving time varies according to the engine speed in the freeze frame data.

Engine speed Time

Around 1,000 rpm Approximately 10 minutes
Around 2,000 rpm Approximately 5 minutes
More than 3,000 rpm Approximately 3.5 minutes
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-288, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094985

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK FOR INTAKE AIR LEAKAGE AND PCV HOSE
1. Start engine and run it at idle speed.
2. Listen for the sound of the intake air leakage.
3. Check PCV hose connection.
Is intake air leakage detected?
YES >> Discover air leakage location and repair.
NO >> GO TO 2.
2.CHECK FOR EXHAUST SYSTEM CLOGGING
Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 3.
YES-2 >> Without CONSULT: GO TO 4.
NO >> Repair or replace malfunctioning part.
3.PERFORM POWER BALANCE TEST
With CONSULT
1. Start engine.

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 P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
3. Check that each circuit produces a momentary engine speed drop. A
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 4. EC
4.CHECK FUNCTION OF FUEL INJECTOR
1. Start engine and let it idle.
C
2. Listen to each fuel injector operation.

Clicking sound should be heard.

D
Is the inspection result normal?
YES >> GO TO 5.
NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to E
EC-496, "Diagnosis Procedure".

F
PBIB3332E

5.CHECK FUNCTION OF IGNITION COIL-I

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CAUTION: G
Perform the following procedure in a place with no combustible objects and good ventilation.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure. H
NOTE:
Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-
dure.
3. Start engine. I
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils. Refer J
to EM-42, "Removal and Installation (LH)" or EM-42, "Removal and Installation (RH)".
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil. K
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure. L
11. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
M
Spark should be generated.
CAUTION: N
• Never place the spark plug and the ignition coil within 50
cm (19.7 in) each other. Be careful not to get an electrical JMBIA0066GB

shock while checking, because the electrical discharge

voltage becomes 20 kV or more. O
• It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunc- P
tioning.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 6.
6.CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.

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 P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect spark plug and connect a non-malfunctioning spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.

Spark should be generated.

Is the inspection result normal?
YES >> GO TO 7.
NO >> Check ignition coil, power transistor and their circuits. Refer to EC-502, "Diagnosis Procedure".
7.CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
Is the inspection result normal?
YES >> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to EM-130, "Spark Plug".
NO >> Repair or clean spark plug. Then GO TO 8.

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SEF156I

8.CHECK FUNCTION OF IGNITION COIL-III

1. Reconnect the initial spark plugs.
2. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded portion.

Spark should be generated.

Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-130, "Spark
Plug".
9.CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to EM-22, "On-Vehicle Service".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
10.CHECK FUEL PRESSURE
1. Install all removed parts.
2. Release fuel pressure to zero. Refer to EC-592, "Inspection".
3. Install fuel pressure gauge kit [SST (J-44321)] and check fuel pressure. Refer to EC-592, "Inspection".

At idle: Approximately 350 kPa (3.57 kg/cm2, 51 psi)

Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly”. Refer to FL-6, "Removal and Installation".
NO >> Repair or replace malfunctioning part.
12.CHECK IGNITION TIMING
Check idle speed and ignition timing.

Revision: August 2013 EC-290 2014 Maxima NAM

 P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
For procedure, refer to EC-14, "BASIC INSPECTION : Special Repair Requirement".
For specification, refer to EC-596, "Idle Speed" and EC-596, "Ignition Timing". A
Is the inspection result normal?
YES >> GO TO 13.
NO >> Follow the EC-14, "BASIC INSPECTION : Special Repair Requirement". EC
13.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
C
2. Disconnect corresponding A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
D
A/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
E
1 45
1 F12
2 49
F13 Existed
1 53 F
2 F61
2 57

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5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground. G

A/F sensor 1
Ground Continuity H
Bank Connector Terminal
1
1 F12
2 I
Ground Not existed
1
2 F61
2
J

ECM
Ground Continuity
Connector Terminal K
45
49
F13 Ground Not existed L
53
57
6. Also check harness for short to power. M
Is the inspection result normal?
YES >> GO TO 14.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. N
14.CHECK A/F SENSOR 1 HEATER
Refer to EC-172, "Component Inspection".
O
Is the inspection result normal?
YES >> GO TO 15.
NO >> Replace (malfunctioning) A/F sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH). P

15.CHECK MASS AIR FLOW SENSOR

With CONSULT
1. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT.
2. For specification, refer to EC-596, "Mass Air Flow Sensor".
With GST
1. Check mass air flow sensor signal in Service $01 with GST.
Revision: August 2013 EC-291 2014 Maxima NAM
 P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. For specification, refer to EC-596, "Mass Air Flow Sensor".
Is the measurement value within the specification?
YES >> GO TO 16.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-190, "Diagnosis Procedure".
16.CHECK SYMPTOM TABLE
Check items on the rough idle symptom in EC-581, "Symptom Table".
Is the inspection result normal?
YES >> GO TO 17.
NO >> Repair or replace malfunctioning part.
17.ERASE THE 1ST TRIP DTC
Some tests may cause a 1st trip DTC to be set.
Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to EC-138, "CONSULT Func-
tion".

>> GO TO 18.
18.CHECK INTERMITTENT INCIDENT

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Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Revision: August 2013 EC-292 2014 Maxima NAM

 P0327, P0328, P0332, P0333 KS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0327, P0328, P0332, P0333 KS
A
Description INFOID:0000000010094986

The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A EC
knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a
voltage signal and sent to the ECM.
DTC Logic INFOID:0000000010094987 C

DTC DETECTION LOGIC

D
Trouble diagnosis
DTC No. DTC detected condition Possible cause
name
Knock sensor (bank 1) An excessively low voltage from the sensor is E
P0327
circuit low input sent to ECM.
Knock sensor (bank 1) An excessively high voltage from the sensor is
P0328 • Harness or connectors
circuit high input sent to ECM.
(The sensor circuit is open or shorted.) F
Knock sensor (bank 2) An excessively low voltage from the sensor is • Knock sensor
P0332
circuit low input sent to ECM.

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Knock sensor (bank 2) An excessively high voltage from the sensor is
P0333 G
circuit high input sent to ECM.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING H

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. I
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION: J
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2. K
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and run it for at least 5 seconds at idle speed. L
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-293, "Diagnosis Procedure". M
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094988

N
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
O
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
P
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK KNOCK SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect knock sensor harness connector and ECM harness connector.
2. Check the continuity between knock sensor harness connector and ECM harness connector.

Revision: August 2013 EC-293 2014 Maxima NAM

 P0327, P0328, P0332, P0333 KS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

Knock sensor ECM

DTC Continuity
Bank Connector Terminal Connector Terminal
P0327, P0328 1 F202 2
F13 67 Existed
P0332, P0333 2 F203 2
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F69, F201
• Harness for open or short between knock sensor and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between knock sensor harness connector and ECM harness connector.

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Knock sensor ECM
DTC Continuity
Bank Connector Terminal Connector Terminal
P0327, P0328 1 F202 1 61
F13 Existed
P0332, P0333 2 F203 1 62
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F69, F201
• Harness for open or short between knock sensor and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK KNOCK SENSOR
Refer to EC-294, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace malfunctioning knock sensor. Refer to EM-107, "Disassembly and Assembly".
7.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094989

1.CHECK KNOCK SENSOR

1. Turn ignition switch OFF.
2. Disconnect knock sensor harness connector.

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 P0327, P0328, P0332, P0333 KS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check resistance between knock sensor terminal as per the fol-
lowing. A
NOTE:
It is necessary to use an ohmmeter which can measure
more than 10 MΩ.
EC

Terminals Resistance
1 and 2 Approx. 532 - 588 kΩ [at 20°C (68°F)] C
CAUTION:
Never use any knock sensors that have been dropped or JMBIA1630ZZ
physically damaged. Use only new ones. D
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace malfunctioning knock sensor. Refer to EM-107, "Disassembly and Assembly". E

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G

Revision: August 2013 EC-295 2014 Maxima NAM

 P0335 CKP SENSOR (POS)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0335 CKP SENSOR (POS)
Description INFOID:0000000010094990

The crankshaft position sensor (POS) is located on the oil pan facing
the gear teeth (cogs) of the signal plate. It detects the fluctuation of
the engine revolution.
The sensor consists of a permanent magnet and Hall IC.
When the engine is running, the high and low parts of the teeth
cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.
The ECM receives the voltage signal and detects the fluctuation of
the engine revolution.
JMBIA0062ZZ

ECM receives the signals as shown in the figure.

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JMBIA0001GB

DTC Logic INFOID:0000000010094991

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
[Crankshaft position (CKP) sensor (POS)
circuit is open or shorted.]
• The crankshaft position sensor (POS) signal
[Accelerator pedal position (APP) sensor
is not detected by the ECM during the first
2 circuit is shorted.]
few seconds of engine cranking.
(EVAP control system pressure sensor
• The proper pulse signal from the crankshaft
Crankshaft position sen- circuit is shorted.)
P0335 position sensor (POS) is not sent to ECM
sor (POS) circuit (Refrigerant pressure sensor circuit is
while the engine is running.
shorted.)
• The crankshaft position sensor (POS) signal
• CKP sensor (POS)
is not in the normal pattern during engine run-
• APP sensor
ning.
• EVAP control system pressure sensor
• Refrigerant pressure sensor
• Signal plate

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V with igni-
tion switch ON.

Revision: August 2013 EC-296 2014 Maxima NAM

 P0335 CKP SENSOR (POS)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE A

1. Start engine and let it idle for at least 5 seconds.

If engine does not start, crank engine for at least 2 seconds.
EC
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-297, "Diagnosis Procedure".
C
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094992

D
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF. E
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2. F
NO >> Repair or replace ground connection.
2.CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-I

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G
1. Disconnect crankshaft position (CKP) sensor (POS) harness connector.
2. Turn ignition switch ON.
3. Check the voltage between CKP sensor (POS) harness connec-
tor and ground. H

CKP sensor (POS)

Ground Voltage (V) I
Connector Terminal
F30 1 Ground Approx. 5
Is the inspection result normal? J
YES >> GO TO 8.
NO >> GO TO 3.
PBIB3312E
K
3.CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-II
1. Turn ignition switch ON.
2. Disconnect ECM harness connector. L
3. Check the continuity between CKP sensor (POS) harness connector and ECM harness connector.

CKP sensor (POS) ECM M

Continuity
Connector Terminal Connector Terminal
F30 1 F13 76 Existed
N
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit.
O
4.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
P
ECM Sensor
Connector Terminal Name Connector Terminal
72 Refrigerant pressure sensor E219 1
F13
76 CKP sensor (POS) F30 1

Revision: August 2013 EC-297 2014 Maxima NAM

 P0335 CKP SENSOR (POS)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
ECM Sensor
Connector Terminal Name Connector Terminal
87 APP sensor E40 6
E10
91 EVAP control system pressure sensor B41 3
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors.
5.CHECK COMPONENTS
Check the following.
• EVAP control system pressure sensor (Refer to EC-346, "Component Inspection".)
• Refrigerant pressure sensor (Refer to EC-515, "Diagnosis Procedure".)
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace malfunctioning components.
6.CHECK APP SENSOR
Refer to EC-469, "Component Inspection".
Is the inspection result normal?

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YES >> GO TO 12.
NO >> GO TO 7.
7.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Refer to EC-469, "Special Repair Requirement".

>> INSPECTION END

8.CHECK CKP SENSOR (POS) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between CKP sensor (POS) harness connector and ECM harness connector.

CKP sensor (POS) ECM

Continuity
Connector Terminal Connector Terminal
F30 2 F13 60 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
9.CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between CKP sensor (POS) harness connector and ECM harness connector.

CKP sensor (POS) ECM

Continuity
Connector Terminal Connector Terminal
F30 3 F13 65 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK CRANKSHAFT POSITION SENSOR (POS)
Revision: August 2013 EC-298 2014 Maxima NAM
 P0335 CKP SENSOR (POS)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Refer to EC-299, "Component Inspection".
Is the inspection result normal? A
YES >> GO TO 11.
NO >> Replace crankshaft position sensor (POS). Refer to EM-37, "Removal and Installation (Upper Oil
Pan)". EC
11. CHECK GEAR TOOTH
Visually check for chipping drive plate gear tooth.
C
Is the inspection result normal?
YES >> GO TO 12.
NO >> Replace the drive plate. Refer to EM-107, "Disassembly and Assembly". D
12.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
E
>> INSPECTION END
Component Inspection INFOID:0000000010094993 F

1.CHECK CRANKSHAFT POSITION SENSOR (POS)-I

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1. Loosen the fixing bolt of the sensor. G
2. Disconnect crankshaft position sensor (POS) harness connector.
3. Remove the sensor.
4. Visually check the sensor for chipping. H
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace crankshaft position sensor (POS). Refer to EM- I
37, "Removal and Installation (Upper Oil Pan)".

JMBIA0063ZZ K
2.CHECK CRANKSHAFT POSITION SENSOR (POS)-II
Check resistance crankshaft position sensor (POS) terminals as per
the following. L

Terminal No. (Polarity) Resistance

M
1 (+) - 2 (-)
1 (+) - 3 (-) Except 0 or ∞ Ω [at 25°C (77°F)]
2 (+) - 3 (-) N
Is the inspection result normal?
YES >> INSPECTION END PBIA9584J
NO >> Replace crankshaft position sensor (POS). Refer to EM- O
37, "Removal and Installation (Upper Oil Pan)".

Revision: August 2013 EC-299 2014 Maxima NAM

 P0340, P0345 CMP SENSOR (PHASE)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0340, P0345 CMP SENSOR (PHASE)
Description INFOID:0000000010094994

The camshaft position sensor (PHASE) senses the retraction of

camshaft (INT) to identify a particular cylinder. The camshaft position
sensor (PHASE) senses the piston position.
When the crankshaft position sensor (POS) system becomes inoper-
ative, the camshaft position sensor (PHASE) provides various con-
trols of engine parts instead, utilizing timing of cylinder identification
signals.
The sensor consists of a permanent magnet and Hall IC.
When engine is running, the high and low parts of the teeth cause
the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
JMBIA0064ZZ

Due to the changing magnetic field, the voltage from the sensor changes.
ECM receives the signals as shown in the figure.

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JMBIA0001GB

DTC Logic INFOID:0000000010094995

DTC DETECTION LOGIC

NOTE:
If DTC P0340 or P0345 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Camshaft position sen- • Harness or connectors
• The cylinder No. signal is not sent to ECM for
P0340 sor (PHASE) (bank 1) (The sensor circuit is open or shorted.)
the first few seconds during engine cranking.
circuit • Camshaft position sensor (PHASE)
• The cylinder No. signal is not sent to ECM
• Camshaft (INT)
Camshaft position sen- during engine running.
• Starter motor (Refer to STR-8.)
P0345 sor (PHASE) (bank 2) • The cylinder No. signal is not in the normal
• Starting system circuit (Refer to STR-8.)
circuit pattern during engine running.
• Dead (Weak) battery

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V with igni-
tion switch ON.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
Revision: August 2013 EC-300 2014 Maxima NAM
 P0340, P0345 CMP SENSOR (PHASE)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Start engine and let it idle for at least 5 seconds.
If engine does not start, crank engine for at least 2 seconds. A
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-301, "Diagnosis Procedure". EC
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-I
C
1. Maintaining engine speed at more than 800 rpm for at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
D
YES >> Go to EC-301, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010094996 E

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK STARTING SYSTEM F
Turn ignition switch to START position.
Does the engine turn over? Does the starter motor operate?

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YES >> GO TO 2. G
NO >> Check starting system. (Refer to STR-2, "Work Flow (With GR8-1200 NI)" or STR-6, "Work Flow
(Without GR8-1200 NI)".)
2.CHECK GROUND CONNECTION H

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
I
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace ground connection. J
3.CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT
1. Disconnect camshaft position (CMP) sensor (PHASE) harness connector.
2. Turn ignition switch ON. K
3. Check the voltage between CMP sensor (PHASE) harness con-
nector and ground.
L
CMP sensor (PHASE)
DTC Ground Voltage (V)
Bank Connector Terminal
P0340 1 F55 1 M
Ground Approx. 5
P0345 2 F60 1
Is the inspection result normal? N
YES >> GO TO 4. PBIB3312E
NO >> Repair open circuit or short to ground or short to power
in harness or connectors.
O
4.CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. P
3. Check the continuity between CMP sensor (PHASE) harness connector and ECM harness connector.

CMP sensor (PHASE) ECM

DTC Continuity
Bank Connector Terminal Connector Terminal
P0340 1 F55 2 64
F13 Existed
P0345 2 F60 2 68

Revision: August 2013 EC-301 2014 Maxima NAM

 P0340, P0345 CMP SENSOR (PHASE)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between CMP sensor (PHASE) harness connector and ECM harness connector.

CMP sensor (PHASE) ECM

DTC Continuity
Bank Connector Terminal Connector Terminal
P0340 1 F55 3 70
F13 Existed
P0345 2 F60 3 69
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to EC-302, "Component Inspection".

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Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace malfunctioning camshaft position sensor (PHASE). Refer to EM-37, "Removal and Instal-
lation (Upper Oil Pan)".
7.CHECK CAMSHAFT (INT)
Check the following.
• Accumulation of debris to the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES >> GO TO 8.
NO >> Remove debris and clean the drive plate of camshaft
rear end or replace camshaft. Refer to EM-107, "Disas-
sembly and Assembly".

JMBIA0058ZZ

8.CHECK INTERMITTENT INCIDENT

Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010094997

1.CHECK CAMSHAFT POSITION SENSOR (PHASE)-I

1. Turn ignition switch OFF.
2. Loosen the fixing bolt of the sensor.
3. Disconnect camshaft position sensor (PHASE) harness connector.
4. Remove the sensor.

Revision: August 2013 EC-302 2014 Maxima NAM

 P0340, P0345 CMP SENSOR (PHASE)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
5. Visually check the sensor for chipping.
Is the inspection result normal? A
YES >> GO TO 2.
NO >> Replace malfunctioning camshaft position sensor
(PHASE). Refer to EM-48, "Exploded View". EC

JMBIA0065ZZ

2.CHECK CAMSHAFT POSITION SENSOR (PHASE)-II D

Check resistance camshaft position sensor (PHASE) terminals as

per the following.
E

Terminal No. (Polarity) Resistance

1 (+) - 2 (-) F
1 (+) - 3 (-) Except 0 or ∞Ω [at 25°C (77°F)]
2 (+) - 3 (-)

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G
Is the inspection result normal?
YES >> INSPECTION END PBIA9584J
NO >> Replace malfunctioning camshaft position sensor
(PHASE). Refer to EM-48, "Exploded View". H

Revision: August 2013 EC-303 2014 Maxima NAM

 P0420, P0430 THREE WAY CATALYST FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0420, P0430 THREE WAY CATALYST FUNCTION
DTC Logic INFOID:0000000010094998

DTC DETECTION LOGIC

The ECM monitors the switching frequency ratio of air fuel ratio (A/F)
sensor 1 and heated oxygen sensor 2.
A three way catalyst (manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of A/F sensor 1 and heated oxygen sensor
2 approaches a specified limit value, the three way catalyst (mani-
fold) malfunction is diagnosed.

PBIB2055E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

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Catalyst system efficien- • Three way catalyst (manifold)
P0420 cy below threshold • Exhaust tube
• Three way catalyst (manifold) does not oper-
(bank 1) • Intake air leakage
ate properly.
• Fuel injector
Catalyst system efficien- • Three way catalyst (manifold) does not have
• Fuel injector leakage
P0430 cy below threshold enough oxygen storage capacity.
• Spark plug
(bank 2) • Improper ignition timing

DTC CONFIRMATION PROCEDURE

1.INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 7.
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Do not maintain engine speed for more than the specified minutes below.

>> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Check that “COOLAN TEMP/S” indicates more than 70°C (158°F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70°C (158°F).
9. Open engine hood.
10. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUPPORT” mode with CONSULT.
Revision: August 2013 EC-304 2014 Maxima NAM
 P0420, P0430 THREE WAY CATALYST FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
11. Rev engine between 2,000 and 3,000 rpm and hold it for 3 consecutive minutes then release the acceler-
ator pedal completely. A
12. Check the indication of “CATALYST”.
Which is displayed on CONSULT screen?
CMPLT >> GO TO 6. EC
INCMP >> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE-II
C
1. Wait 5 seconds at idle.
2. Rev engine between 2,000 and 3,000 rpm and maintain it until “INCMP” of “CATALYST” changes to
“CMPLT” (It will take approximately 5 minutes).
Does the indication change to “CMPLT”? D
YES >> GO TO 6.
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE AGAIN E

1. Stop engine and cool it down to less than 70°C (158°F).

2. Perform DTC CONFIRMATION PROCEDURE again. F

>> GO TO 3.

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6.PERFORM DTC CONFIRMATION PROCEDURE-III G
Check 1st trip DTC.
Is 1st trip DTC detected? H
YES >> Go to EC-306, "Diagnosis Procedure".
NO >> INSPECTION END
7.PERFORM COMPONENT FUNCTION CHECK I
Perform component function check. Refer to EC-305, "Component Function Check".
NOTE:
Use component function check to check the overall function of the three way catalyst (manifold). During this J
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END K
NO >> Go to EC-306, "Diagnosis Procedure".
Component Function Check INFOID:0000000010094999
L
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.PERFORM COMPONENT FUNCTION CHECK
M
Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON. N
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute. O
7. Open engine hood.

Revision: August 2013 EC-305 2014 Maxima NAM

 P0420, P0430 THREE WAY CATALYST FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
8. Check the voltage between ECM harness connector terminals
under the following conditions.

JMBIA1865ZZ

ECM
DTC Connec- + – Condition Voltage (V)
tor Terminal Terminal
33
P0420 [HO2S2 (bank 1) The voltage fluctuation cycle takes
signal] 35
Keeping engine speed at 2,500 rpm more than 5 seconds.
F13 (Sensor

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34 constant under no load • 1 cycle: 0.6 - 1.0 → 0 - 0.3 → 0.6 -
ground)
P0430 [HO2S2 (bank 2) 1.0
signal]
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-306, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095000

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dents.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning part.
2.CHECK EXHAUST GAS LEAKAGE
1. Start engine and run it at idle.
2. Listen for an exhaust gas leakage before the three way catalyst (manifold).

PBIB1216E

Is exhaust gas leakage detected?

YES >> Repair or replace malfunctioning part.
NO >> GO TO 3.
3.CHECK INTAKE AIR LEAKAGE
Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES >> Repair or replace malfunctioning part.

Revision: August 2013 EC-306 2014 Maxima NAM

 P0420, P0430 THREE WAY CATALYST FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> GO TO 4.
4.CHECK IGNITION TIMING A

Check idle speed and ignition timing.

For procedure, refer to EC-14, "BASIC INSPECTION : Special Repair Requirement".
EC
For specification, refer to EC-596, "Ignition Timing".
Is the inspection result normal?
YES >> GO TO 5.
C
NO >> Follow the EC-14, "BASIC INSPECTION : Special Repair Requirement".
5.CHECK FUEL INJECTORS
1. Stop engine and then turn ignition switch ON. D
2. Check the voltage between ECM harness connectors.

ECM Ground E
+ – Voltage
Connector Terminal Connector Terminal
F
1
3

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29 G
F14 E10 112 Battery voltage
30 JMBIA1869GB

31
H
32
Is the inspection result normal?
YES >> GO TO 6. I
NO >> Perform EC-496, "Diagnosis Procedure".
6.CHECK FUNCTION OF IGNITION COIL-I
CAUTION: J
Perform the following procedure in a place with no combustible objects and good ventilation.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure. K
NOTE:
Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-
dure.
3. Start engine. L
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils. Refer M
to EM-42, "Removal and Installation (LH)" or EM-42, "Removal and Installation (RH)".
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
N
9. Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure. O
11. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
P
Spark should be generated.
CAUTION:
• Never place the spark plug and the ignition coil within 50
cm (19.7 in) each other. Be careful not to get an electrical JMBIA0066GB

shock while checking, because the electrical discharge

voltage becomes 20 kV or more.

Revision: August 2013 EC-307 2014 Maxima NAM

 P0420, P0430 THREE WAY CATALYST FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunc-
tioning.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 7.
7.CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a non-malfunctioning spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.

Spark should be generated.

Is the inspection result normal?
YES >> GO TO 8.
NO >> Check ignition coil, power transistor and their circuit. Refer to EC-502, "Diagnosis Procedure".
8.CHECK SPARK PLUG

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Check the initial spark plug for fouling, etc.
Is the inspection result normal?
YES >> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to EM-130, "Spark Plug".
NO >> Repair or clean spark plug. Then GO TO 9.

SEF156I

9.CHECK FUNCTION OF IGNITION COIL-III

1. Reconnect the initial spark plugs.
2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug
and the grounded portion.

Spark should be generated.

Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-12, "Removal
and Installation".
10.CHECK FUEL INJECTOR
1. Turn ignition switch OFF.
2. Remove fuel injector assembly.
Refer to EM-43, "Removal and Installation".
Keep fuel hose and all fuel injectors connected to fuel tube.
3. Disconnect all ignition coil harness connectors.
4. Reconnect all fuel injector harness connectors disconnected.
5. Turn ignition switch ON.
Check that fuel does not drip from fuel injector.
Does fuel drip from fuel injector?
YES >> Replace the fuel injector(s) from which fuel is dripping. Refer to EM-43, "Removal and Installa-
tion".
NO >> GO TO 11.
11.CHECK INTERMITTENT INCIDENT
Revision: August 2013 EC-308 2014 Maxima NAM
 P0420, P0430 THREE WAY CATALYST FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Refer to GI-41, "Intermittent Incident".
Is the inspection result normal? A
YES >> Replace three way catalyst assembly. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH).
NO >> Repair or Replace harness or connector. EC

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G

Revision: August 2013 EC-309 2014 Maxima NAM

 P0441 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0441 EVAP CONTROL SYSTEM
DTC Logic INFOID:0000000010095001

DTC DETECTION LOGIC

NOTE:
If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform
trouble diagnosis for other DTC.
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con-
trol system pressure sensor to intake manifold vacuum.
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow
are adequate. If not, a malfunction is determined.

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PBIB3640E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• EVAP canister purge volume control so-
lenoid valve stuck closed
• EVAP control system pressure sensor
and the circuit
• Loose, disconnected or improper con-
EVAP control system does not operate proper- nection of rubber tube
EVAP control system in- ly, EVAP control system has a leakage between • Blocked rubber tube
P0441
correct purge flow intake manifold and EVAP control system pres- • Cracked EVAP canister
sure sensor. • EVAP canister purge volume control so-
lenoid valve circuit
• Accelerator pedal position sensor
• Blocked purge port
• EVAP canister vent control valve
• Drain filter

DTC CONFIRMATION PROCEDURE

1.INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 6.
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.

Revision: August 2013 EC-310 2014 Maxima NAM

 P0441 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. A
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.
EC

>> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-I C
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds. D
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and let it idle for at least 70 seconds. E
6. Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT.
7. Touch “START”.
F
Is “COMPLETED” displayed on CONSULT screen?
YES >> GO TO 5.

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NO >> GO TO 4.
G
4.PERFORM DTC CONFIRMATION PROCEDURE-II
When the following conditions are met, “TESTING” will be displayed on the CONSULT screen. Maintain the
conditions continuously until “TESTING” changes to “COMPLETED”. (It will take at least 35 seconds.) H

Selector lever Suitable position

VHCL SPEED SE 32 - 120 km/h (20 - 75 mph) I
ENG SPEED 500 - 3,000 rpm
B/FUEL SCHDL 1.3 - 9.0 msec
J
COOLAN TEMP/S More than 0°C (32°F)
CAUTION:
Always drive vehicle at a safe speed. K
If “TESTING” does not change for a long time, retry from step 2.
Is “COMPLETED” displayed on CONSULT screen?
YES >> GO TO 5. L
NO >> Perform DTC CONFIRMATION PROCEDURE again. GO TO 3.
5.PERFORM DTC CONFIRMATION PROCEDURE-III
M
Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT screen?
OK >> INSPECTION END
N
NG >> Go to EC-312, "Diagnosis Procedure".
6.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-311, "Component Function Check". O
NOTE:
Use component function check to check the overall monitoring function of the EVAP control system purge flow
monitoring. During this check, a 1st trip DTC might not be confirmed. P
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-312, "Diagnosis Procedure".
Component Function Check INFOID:0000000010095002

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

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 P0441 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

1.PERFORM COMPONENT FUNCTION CHECK

Without CONSULT
1. Lift up drive wheels.
2. Start engine (VDC switch OFF) and warm it up to normal operating temperature.
3. Turn ignition switch OFF, wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF, wait at least 10 seconds.
6. Start engine and wait at least 70 seconds.
7. Set voltmeter probes to ECM harness connector terminals under
the following conditions.

ECM
+ –
Connector
Terminal Terminal
86
96
E10 (EVAP control system pressure sensor
(Sensor ground)
signal)
8. Check EVAP control system pressure sensor value at idle speed JMBIA1870ZZ

and note it.

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9. Establish and maintain the following conditions for at least 1 minute.

Air conditioner switch ON

Head lamp switch ON
Rear window defogger switch ON
Engine speed Approx. 3,000 rpm
Gear position Any position other than P, N or R
10. Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-312, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095003

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK EVAP CANISTER
1. Turn ignition switch OFF.
2. Check EVAP canister for cracks.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 2.
YES-2 >> Without CONSULT: GO TO 3.
NO >> Replace EVAP canister. Refer to FL-14, "Removal and Installation (EVAP Canister)".
2.CHECK PURGE FLOW
With CONSULT
1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to EC-94, "System Dia-
gram".
2. Start engine and let it idle.
3. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT.
4. Touch “Qd” and “Qu” on CONSULT screen to adjust “PURG VOL CONT/V” opening and check vacuum
existence.

Revision: August 2013 EC-312 2014 Maxima NAM

 P0441 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

PURG VOL CONT/V Vacuum A

100% Existed
0% Not existed
EC
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 4. C
3.CHECK PURGE FLOW
Without CONSULT
1. Start engine and warm it up to normal operating temperature. D
2. Stop engine.
3. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to EC-94, "System Dia- E
gram".
4. Start engine and let it idle.
Do not depress accelerator pedal even slightly.
5. Check vacuum gauge indication before 60 seconds pass after starting engine. F

Vacuum should not exist.

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G
6. Rev engine up to 2,000 rpm after 100 seconds pass after starting engine.

Vacuum should exist.

H
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 4. I
4.CHECK EVAP PURGE LINE
1. Turn ignition switch OFF.
2. Check EVAP purge line for improper connection or disconnection. J
Refer to EC-94, "System Diagram".
Is the inspection result normal?
YES >> GO TO 5. K
NO >> Repair EVAP purge line.
5.CHECK EVAP PURGE HOSE AND PURGE PORT L
1. Disconnect purge hoses connected to EVAP service port A and
EVAP canister purge volume control solenoid valve B.
2. Blow air into each hose and EVAP purge port C.
M

O
SEF367U

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 P0441 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check that air flows freely.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 6.
YES-2 >> Without CONSULT: GO TO 7.
NO >> Repair or clean hoses and/or purge port.

SEF368U

6.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT
1. Start engine.
2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies
according to the valve opening.
Does engine speed vary according to the valve opening?
YES >> GO TO 8.
NO >> GO TO 7.
7.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

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Refer to EC-327, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace EVAP canister purge volume control solenoid valve.
8.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check that water is not inside connectors.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
9.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION
Refer to EC-347, "DTC Logic" for DTC P0452, EC-352, "DTC Logic" for DTC P0453.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
10.CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging.
Is the inspection result normal?
YES >> GO TO 11.
NO >> Clean the rubber tube using an air blower.
11.CHECK DRAIN FILTER
Refer to EC-315, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 12.
NO >> Replace drain filter.
12.CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-335, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 13.

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 P0441 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation".
13.CHECK EVAP PURGE LINE A

Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leakage.
Refer to EC-94, "System Diagram".
EC
Is the inspection result normal?
YES >> GO TO 14.
NO >> Repair EVAP purge line.
C
14.CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
D
>> GO TO 15.
15.CHECK INTERMITTENT INCIDENT E
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END F

Component Inspection INFOID:0000000010095004

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G
DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance. H
3. Check visually for cracks or flaws in the hose.
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B. I
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.
J

PBIB3641E

Revision: August 2013 EC-315 2014 Maxima NAM

 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0442 EVAP CONTROL SYSTEM
DTC Logic INFOID:0000000010095005

DTC DETECTION LOGIC

This diagnosis detects leakage in the EVAP purge line using engine intake manifold vacuum.
If pressure does not increase, the ECM will check for leakage in the line between the fuel tank and EVAP can-
ister purge volume control solenoid valve, under the following “Vacuum test” conditions.
The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge vol-
ume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold
vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.

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PBIB3640E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close.
• Foreign matter caught in fuel filler cap.
• Leakage is in line between intake manifold and
EVAP canister purge volume control solenoid
valve.
• Foreign matter caught in EVAP canister vent con-
trol valve.
• EVAP canister or fuel tank leakage
• EVAP purge line (pipe and rubber tube) leakage
EVAP control system EVAP control system has a leakage, • EVAP purge line rubber tube bent
P0442 small leakage detected EVAP control system does not operate • Loose or disconnected rubber tube
(negative pressure) properly. • EVAP canister vent control valve and the circuit
• EVAP canister purge volume control solenoid
valve and the circuit
• Fuel tank temperature sensor
• Drain filter
• O-ring of EVAP canister vent control valve is
missing or damaged
• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Fuel level sensor and the circuit
• Refueling EVAP vapor cut valve
• ORVR system leakage
CAUTION:
• Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the
MIL may illuminate.
• If the fuel filler cap is not tightened properly, the MIL may illuminate.
• Use only a genuine NISSAN rubber tube as a replacement.

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 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING A

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. EC
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION: C
• Perform “DTC WORK SUPPORT” when the fuel level is between 1/4 and 3/4 full, and vehicle is placed
on flat level surface.
• Always perform test at a temperature of 0 to 30°C (32 to 86°F). D
NOTE:
Check that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.
Will CONSULT be used? E
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM DTC CONFIRMATION PROCEDURE F
With CONSULT
1. Turn ignition switch ON.

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2. Turn ignition switch OFF and wait at least 10 seconds. G
3. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
4. Check that the following conditions are met.
COOLAN TEMP/S: 0 - 70°C (32 - 158°F) H
INT/A TEMP SE: 0 - 30°C (32 - 86°F)
5. Select “EVP V/S LEAK P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT.
Follow the instructions displayed. I
NOTE:
If the engine speed cannot be maintained within the range displayed on the CONSULT screen, go to EC-
14, "BASIC INSPECTION : Special Repair Requirement". J
Which is displayed on CONSULT screen?
OK >> INSPECTION END
NG >> Go to EC-317, "Diagnosis Procedure". K
3.PERFORM COMPONENT FUNCTION CHECK
With GST
NOTE: L
Be sure to read the explanation of EC-26, "SRT Set Driving Pattern" before driving vehicle.
1. Start engine.
2. Drive vehicle according to EC-26, "SRT Set Driving Pattern". M
3. Stop vehicle.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON.
N
6. Turn ignition switch OFF and wait at least 10 seconds.
7. Turn ignition switch ON.
8. Check 1st trip DTC.
Is 1st trip DTC displayed? O
YES-1 >> P0441: Refer to EC-312, "Diagnosis Procedure".
YES-2 >> P0442: Refer to EC-317, "Diagnosis Procedure".
NO >> INSPECTION END P

Diagnosis Procedure INFOID:0000000010095006

1.CHECK FUEL FILLER CAP DESIGN

1. Turn ignition switch OFF.

Revision: August 2013 EC-317 2014 Maxima NAM

 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Check for genuine NISSAN fuel filler cap design.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace with genuine NISSAN fuel filler cap.

SEF915U

2.CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Retighten until
ratcheting sound is heard.
3.CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap.

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Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-321, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace fuel filler cap with a genuine one. Refer to FL-10, "Exploded View".
5.CHECK FOR EVAP LEAKAGE
Refer to EC-594, "Inspection".
Is there any leakage in EVAP line?
YES >> Repair or replace malfunctioning part.
NO >> GO TO 6.
6.CHECK DRAIN FILTER
Refer to EC-321, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace drain filter.
7.CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following.
• EVAP canister vent control valve is installed properly.
Refer to FL-16, "Removal and Installation".
• EVAP canister vent control valve.
Refer to EC-335, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace EVAP canister vent control valve and O-ring. Refer to FL-16, "Removal and
Installation".
8.CHECK IF EVAP CANISTER IS SATURATED WITH WATER

Revision: August 2013 EC-318 2014 Maxima NAM

 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Remove EVAP canister with EVAP canister vent control valve and
EVAP control system pressure sensor attached. Refer to FL-14, A
"Removal and Installation (EVAP Canister)".
Does water drain from the EVAP canister?
YES >> GO TO 9. EC
NO-1 >> With CONSULT: GO TO 11.
NO-2 >> Without CONSULT: GO TO 12.
C

PBIB1213E

9.CHECK EVAP CANISTER D

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
E
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 11.
F
YES-2 >> Without CONSULT: GO TO 12.
NO >> GO TO 10.
10.DETECT MALFUNCTIONING PART

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G
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection H

>> Repair hose or replace EVAP canister. Refer to FL-14, "Removal and Installation (EVAP Canis-
ter)". I
11.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT
1. Disconnect vacuum hose from EVAP canister purge volume control solenoid valve at EVAP service port. J
2. Start engine.
3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.
4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%. K
5. Check vacuum hose for vacuum.

Vacuum should exist. L

Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13. M
12.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
Without CONSULT N
1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose from EVAP canister purge volume control solenoid valve at EVAP service port.
4. Start engine and let it idle for at least 80 seconds. O
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist. P

Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13.
13.CHECK VACUUM HOSE
Check vacuum hoses for clogging or disconnection. Refer to EC-94, "System Diagram".

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 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the inspection result normal?
YES >> GO TO 14.
NO >> Repair or reconnect the hose.
14.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-327, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 15.
NO >> Replace EVAP canister purge volume control solenoid valve.
15.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-272, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace fuel level sensor unit and fuel pump. Refer to FL-6, "Removal and Installation".
16.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-346, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 17.

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NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
17.CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to EC-94, "System Diagram".
Is the inspection result normal?
YES >> GO TO 18.
NO >> Repair or reconnect the hose.
18.CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 19.
19.CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper
connection. For location, refer to EC-508, "Description".
Is the inspection result normal?
YES >> GO TO 20.
NO >> Repair or replace hoses and tubes.
20.CHECK RECIRCULATION LINE
Check recirculation line between filler neck tube and fuel tank for clogging, kinks, cracks, looseness and
improper connection.
Is the inspection result normal?
YES >> GO TO 21.
NO >> Repair or replace hose, tube or filler neck tube.
21.CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-511, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 22.
NO >> Replace refueling EVAP vapor cut valve with fuel tank. Refer to FL-10, "Exploded View".
22.CHECK FUEL LEVEL SENSOR
Refer to EC-321, "Component Inspection".
Is the inspection result normal?
Revision: August 2013 EC-320 2014 Maxima NAM
 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 23.
NO >> Replace fuel level sensor unit and fuel pump. Refer to FL-6, "Removal and Installation". A
23.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
EC

>> INSPECTION END

Component Inspection INFOID:0000000010095007 C

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)
1.CHECK FUEL FILLER CAP D

1. Turn ignition switch OFF.

2. Remove fuel filler cap. Refer to FL-10, "Exploded View". E
3. Wipe clean valve housing.

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G

H
SEF445Y

4. Install fuel filler cap adapter (commercial service tool) to fuel filler cap. I
5. Check valve opening pressure and vacuum.

Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm2, 2.22 - J

2.90 psi)
Vacuum: −6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm2,
−0.87 to −0.48 psi) K
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2. L
SEF943S

2.REPLACE FUEL FILLER CAP

Replace fuel filler cap. Refer to FL-10, "Exploded View". M
CAUTION:
Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may
illuminate. N

>> INSPECTION END

O
DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance. P
3. Check visually for cracks or flaws in the hose.

Revision: August 2013 EC-321 2014 Maxima NAM

 P0442 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

PBIB3641E

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Revision: August 2013 EC-322 2014 Maxima NAM

 P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
A
Description INFOID:0000000010095008

The EVAP canister purge volume control solenoid valve is used to EC

control the flow rate of fuel vapor from the EVAP canister. The EVAP
canister purge volume control solenoid valve is moved by ON/OFF
pulses from the ECM. The longer the ON pulse, the greater the
amount of fuel vapor that will flow via the valve. C

PBIB3489E E
DTC Logic INFOID:0000000010095009

DTC DETECTION LOGIC F

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
G
The canister purge flow is detected during • EVAP control system pressure sensor
the vehicle is stopped while the engine is • EVAP canister purge volume control sole-
A running, even when EVAP canister purge noid valve
volume control solenoid valve is completely (The valve is stuck open.) H
EVAP canister purge
closed. • EVAP canister vent control valve
P0443 volume control solenoid
• Drain filter
valve The canister purge flow is detected during • EVAP canister
B
the specified driving conditions, even when • Hoses I
EVAP canister purge volume control sole- (Hoses are connected incorrectly or
noid valve is completely closed. clogged.)

DTC CONFIRMATION PROCEDURE J

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at K
least 10 seconds before conducting the next test.
TESTING CONDITION:
• Perform DTC CONFIRMATION PROCEDURE when the fuel is between 1/4 and 3/4 full, and vehicle is
L
placed on flat level surface.
• Always perform test at a temperature of 5 to 60°C (41 to 140°F).
• Cool the vehicle so that engine coolant temperature becomes same level as ambient temperature.
Do you have CONSULT M
YES >> GO TO 2.
NO >> GO TO 4.
2.PERFORM DTC CONFIRMATION PROCEDURE A N

With CONSULT
1. Turn ignition switch ON. O
2. Select “DATA MONITOR” mode with CONSULT.
3. Check that the following condition are met.
FUEL T/TMP SE: 0 - 35°C (32 - 95°F)
4. Start engine and wait at least 60 seconds. P
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-324, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE B

Revision: August 2013 EC-323 2014 Maxima NAM

 P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Select “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with
CONSULT.
5. Touch “START”.
6. Start engine and let it idle until “TESTING” on CONSULT changes to “COMPLETED”. (It will take approxi-
mately 10 seconds.)
If “TESTING” is not displayed after 5 minutes, retry from step 2.
7. Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT?
OK >> INSPECTION END
NG >> Go to EC-324, "Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PROCEDURE A
With GST
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector and ground.

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ECM
Ground Voltage (V)
Connector Terminal
95
E10 Ground 3.1 - 4.0
(Fuel tank temperature sensor signal)
3. Start engine and wait at least 60 seconds.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-324, "Diagnosis Procedure".
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE
With GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and let it idle for at least 20 seconds.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-324, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095010

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EVAP canister purge volume control solenoid valve harness connector.
3. Turn ignition switch ON.

Revision: August 2013 EC-324 2014 Maxima NAM

 P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check the voltage between EVAP canister purge volume control
solenoid valve harness connector and ground. A

EVAP canister purge volume control

solenoid valve Ground Voltage EC
Connector Terminal
F29 1 Ground Battery voltage
C
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2. PBIB0080E

D
2.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E11, F2 E
• Junction block connectors E44, E45
• Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R
• Harness for open or short between EVAP canister purge volume control solenoid valve and ECM
F

>> Repair open circuit, short to ground or short to power in harness or connectors.

cardiagn.com
3.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT G
FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. H
3. Check the continuity between EVAP canister purge volume control solenoid valve harness connector and
ECM harness connector.
I
EVAP canister purge volume con-
ECM
trol solenoid valve Continuity
Connector Terminal Connector Terminal J
F29 2 F14 25 Existed
4. Also check harness for short to ground and short to power.
K
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
L
4.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check that water is not inside connectors. M
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation". N
5.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-346, "Component Inspection".
O
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 6.
YES-2 >> Without CONSULT: GO TO 7.
P
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
6.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT
1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected.
3. Start engine.

Revision: August 2013 EC-325 2014 Maxima NAM

 P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies
according to the valve opening.
Does engine speed vary according to the valve opening?
YES >> GO TO 8.
NO >> GO TO 7.
7.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-327, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace EVAP canister purge volume control solenoid valve.
8.CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Clean the rubber tube using an air blower.
9.CHECK DRAIN FILTER

cardiagn.com
Refer to EC-327, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace drain filter.
10.CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-335, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 11.
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation".
11.CHECK IF EVAP CANISTER IS SATURATED WITH WATER
Remove EVAP canister with EVAP canister vent control valve and
EVAP control system pressure sensor attached. Refer to FL-14,
"Removal and Installation (EVAP Canister)".
Does water drain from the EVAP canister?
YES >> GO TO 12.
NO >> GO TO 14.

PBIB1213E

12.CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13.
13.DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection

Revision: August 2013 EC-326 2014 Maxima NAM

 P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> Repair hose or replace EVAP canister. Refer to FL-14, "Removal and Installation (EVAP Canis-
ter)". A
14.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
EC

>> INSPECTION END

Component Inspection INFOID:0000000010095011 C

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

1.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE D

With CONSULT
1. Turn ignition switch OFF. E
2. Reconnect all harness connectors disconnected.
3. Disconnect EVAP purge hoses connected to EVAP canister purge volume control solenoid valve.
4. Turn ignition switch ON.
5. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. F
6. Touch “Qd” and “Qu” on CONSULT screen to adjust “PURG
VOL CONT/V” opening and check air passage continuity of

cardiagn.com
EVAP canister purge volume control solenoid valve under the G
following conditions.

Condition Air passage continuity H

(PURG VOL CONT/V value) between (A) and (B)
100% Existed
0% Not existed I
PBIB2058E

Without CONSULT J
1. Turn ignition switch OFF.
2. Disconnect EVAP canister purge volume control solenoid valve harness connector.
3. Disconnect EVAP purge hoses connected to EVAP canister purge volume control solenoid valve. K
4. Check air passage continuity of EVAP canister purge volume
control solenoid valve under the following conditions.
L
Air passage continuity
Condition
between (A) and (B)
12 V direct current supply between
Existed M
terminals 1 and 2
No supply Not existed
Is the inspection result normal? N
YES >> INSPECTION END PBIB2059E

NO >> Replace EVAP canister purge volume control solenoid

valve O
DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance. P
3. Check visually for cracks or flaws in the hose.

Revision: August 2013 EC-327 2014 Maxima NAM

 P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

PBIB3641E

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Revision: August 2013 EC-328 2014 Maxima NAM

 P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
A
VALVE
Description INFOID:0000000010095012
EC
The EVAP canister purge volume control solenoid valve is used to
control the flow rate of fuel vapor from the EVAP canister. The EVAP
canister purge volume control solenoid valve is moved by ON/OFF C
pulses from the ECM. The longer the ON pulse, the greater the
amount of fuel vapor that will flow via the valve.
D

E
PBIB3489E

DTC Logic INFOID:0000000010095013

F

DTC DETECTION LOGIC

cardiagn.com
G
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
EVAP canister purge volume (The solenoid valve circuit is open or
P0444 control solenoid valve circuit
An excessively low voltage signal is sent
shorted.) H
to ECM via the valve
open • EVAP canister purge volume control so-
lenoid valve
• Harness or connectors I
EVAP canister purge volume
An excessively high voltage signal is sent (The solenoid valve circuit is shorted.)
P0445 control solenoid valve circuit
to ECM via the valve • EVAP canister purge volume control so-
shorted
lenoid valve
J
DTC CONFIRMATION PROCEDURE
1.CONDITIONING
K
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. L
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11 V at idle. M

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE N

1. Start engine and let it idle for at least 13 seconds.

2. Check 1st trip DTC.
O
Is 1st trip DTC detected?
YES >> Go to EC-329, "Diagnosis Procedure".
NO >> INSPECTION END
P
Diagnosis Procedure INFOID:0000000010095014

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EVAP canister purge volume control solenoid valve harness connector.

Revision: August 2013 EC-329 2014 Maxima NAM

 P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Turn ignition switch ON.
4. Check the voltage between EVAP canister purge volume control
solenoid valve harness connector and ground.

EVAP canister purge volume control

solenoid valve Ground Voltage
Connector Terminal
F29 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2. PBIB0080E

2.DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E11, F2
• Junction block connectors E44, E45
• Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R
• Harness for open or short between EVAP canister purge volume control solenoid valve and ECM

cardiagn.com
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT
FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between EVAP canister purge volume control solenoid valve harness connector and
ECM harness connector.

EVAP canister purge volume con-

ECM
trol solenoid valve Continuity
Connector Terminal Connector Terminal
F29 2 F14 25 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 4.
YES-2 >> Without CONSULT: GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine.
3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies
according to the valve opening.
Does engine speed vary according to the valve opening?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-331, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace EVAP canister purge volume control solenoid valve.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
Revision: August 2013 EC-330 2014 Maxima NAM
 P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

>> INSPECTION END A

Component Inspection INFOID:0000000010095015

EC
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
1.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
C
With CONSULT
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect EVAP purge hoses connected to EVAP canister purge volume control solenoid valve. D
4. Turn ignition switch ON.
5. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT.
6. Touch “Qd” and “Qu” on CONSULT screen to adjust “PURG E
VOL CONT/V” opening and check air passage continuity of
EVAP canister purge volume control solenoid valve under the
following conditions.
F
Condition Air passage continuity
(PURG VOL CONT/V value) between (A) and (B)

cardiagn.com
100% Existed G
0% Not existed
PBIB2058E
H

Without CONSULT
1. Turn ignition switch OFF.
I
2. Disconnect EVAP canister purge volume control solenoid valve harness connector.
3. Disconnect EVAP purge hoses connected to EVAP canister purge volume control solenoid valve.
4. Check air passage continuity of EVAP canister purge volume
control solenoid valve under the following conditions. J

Air passage continuity

Condition
between (A) and (B) K
12 V direct current supply between
Existed
terminals 1 and 2
No supply Not existed L
Is the inspection result normal?
YES >> INSPECTION END PBIB2059E

NO >> Replace EVAP canister purge volume control solenoid M

valve
DRAIN FILTER
N
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose. O

Revision: August 2013 EC-331 2014 Maxima NAM

 P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

PBIB3641E

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Revision: August 2013 EC-332 2014 Maxima NAM

 P0447 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0447 EVAP CANISTER VENT CONTROL VALVE
A
Description INFOID:0000000010095016

The EVAP canister vent control valve is located on the EVAP canis- EC
ter and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the canister vent. The ability to seal C
the vent is necessary for the on board diagnosis of other evaporative
emission control system components.
This solenoid valve is used only for diagnosis, and usually remains D
opened.
When the vent is closed, under normal purge conditions, the evapo-
rative emission control system is depressurized and allows “EVAP
Control System” diagnosis.
PBIB1263E E

DTC Logic INFOID:0000000010095017

F
DTC DETECTION LOGIC

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause G
• Harness or connectors
(The valve circuit is open or shorted.)
• EVAP canister vent control valve H
EVAP canister vent con- An improper voltage signal is sent to ECM via
P0447 • Hoses
trol valve circuit open the EVAP canister vent control valve.
(Hoses are connected incorrectly or
clogged.)
• Drain filter I
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING J
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. K
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
L
Before performing the following procedure, confirm battery voltage is more than 11 V at idle.

>> GO TO 2. M
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait at least 8 seconds.
2. Check 1st trip DTC. N
Is 1st trip DTC detected?
YES >> Go to EC-333, "Diagnosis Procedure".
NO >> INSPECTION END O

Diagnosis Procedure INFOID:0000000010095018

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". P

1.INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3.

Revision: August 2013 EC-333 2014 Maxima NAM

 P0447 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

With CONSULT
1. Turn ignition switch OFF and then ON.
2. Select “VENT CONTROL/V” in “ACTIVE TEST” mode with CONSULT.
3. Touch “ON/OFF” on CONSULT screen.
4. Check for operating sound of the valve.

Clicking sound should be heard.

Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 3.
3.CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EVAP canister vent control valve harness connector.
3. Turn ignition switch ON.
4. Check the voltage between EVAP canister vent control valve
harness connector and ground.

cardiagn.com
EVAP canister vent control valve
Ground Voltage
Connector Terminal
B39 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
PBIB0080E

4.DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors B10, E29
• Harness connectors E11, F2
• Harness for open or short between EVAP canister vent control valve and IPDM E/R

>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK EVAP CANISTER VENT CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ECM harness connector and EVAP canister vent control valve harness con-
nector.
Refer to Wiring Diagram.

EVAP canister vent control valve ECM

Continuity
Connector Terminal Connector Terminal
B39 2 E10 109 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between EVAP canister vent control valve and ECM

Revision: August 2013 EC-334 2014 Maxima NAM

 P0447 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK RUBBER TUBE FOR CLOGGING A

1. Disconnect rubber tube connected to EVAP canister vent control valve.

2. Check the rubber tube for clogging.
EC
Is the inspection result normal?
YES >> GO TO 8.
NO >> Clean the rubber tube using an air blower.
C
8.CHECK DRAIN FILTER
Refer to EC-335, "Component Inspection".
Is the inspection result normal? D
YES >> GO TO 9.
NO >> Replace drain filter.
9.CHECK EVAP CANISTER VENT CONTROL VALVE E

Refer to EC-335, "Component Inspection".

Is the inspection result normal? F
YES >> GO TO 10.
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation".

cardiagn.com
10.CHECK INTERMITTENT INCIDENT G
Refer to GI-41, "Intermittent Incident".
H
>> INSPECTION END
Component Inspection INFOID:0000000010095019

I
EVAP CANISTER VENT CONTROL VALVE
1.CHECK EVAP CANISTER VENT CONTROL VALVE-I J
1. Remove EVAP canister vent control valve from EVAP canister. Refer to FL-16, "Removal and Installation".
2. Check portion (A) of EVAP canister vent control valve for rust.
Is it rusted? K
YES >> Replace EVAP canister vent control valve. Refer to FL-
16, "Removal and Installation".
NO >> GO TO 2. L

JMBIA0168ZZ

2.CHECK EVAP CANISTER VENT CONTROL VALVE-II N

With CONSULT
1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON. O
3. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.

Revision: August 2013 EC-335 2014 Maxima NAM

 P0447 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.

Condition VENT CONTROL/V Air passage continuity between (A) and (B)
ON Not existed
OFF Existed
Operation takes less than 1 second.
Without CONSULT
1. Disconnect EVAP canister vent control valve harness connector.
2. Check air passage continuity and operation delay time under the JMBIA0169ZZ

following conditions.
Check that new O-ring is installed properly.

Condition Air passage continuity between (A) and (B)

12 V direct current supply between
Not existed
terminals 1 and 2
OFF Existed
Operation takes less than 1 second.

cardiagn.com
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECK EVAP CANISTER VENT CONTROL VALVE
With CONSULT
1. Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
3. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.

Condition VENT CONTROL/V Air passage continuity between (A) and (B)
ON No
OFF Yes
Operation takes less than 1 second.
Without CONSULT
1. Clean the air passage [portion (A) to (B)] of EVAP canister vent
control valve using an air blower. JMBIA0169ZZ

2. Check air passage continuity and operation delay time under the
following conditions.
Check that new O-ring is installed properly.

Condition Air passage continuity between (A) and (B)

12 V direct current supply between
No
terminals (1) and (2)
OFF Yes
Operation takes less than 1 second.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation".
DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.

Revision: August 2013 EC-336 2014 Maxima NAM

 P0447 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B. A
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.
EC

PBIB3641E

cardiagn.com
G

Revision: August 2013 EC-337 2014 Maxima NAM

 P0448 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
Description INFOID:0000000010095020

The EVAP canister vent control valve is located on the EVAP canis-
ter and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the canister vent. The ability to seal
the vent is necessary for the on board diagnosis of other evaporative
emission control system components.
This solenoid valve is used only for diagnosis, and usually remains
opened.
When the vent is closed, under normal purge conditions, the evapo-
rative emission control system is depressurized and allows “EVAP
Control System” diagnosis.
PBIB1263E

DTC Logic INFOID:0000000010095021

DTC DETECTION LOGIC

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• EVAP canister vent control valve
• EVAP control system pressure sensor
and the circuit
EVAP canister vent con- EVAP canister vent control valve remains
P0448 • Blocked rubber tube to EVAP canister
trol valve close closed under specified driving conditions.
vent control valve
• Drain filter
• EVAP canister is saturated with water

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON and wait at least 5 seconds.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
4. Start engine and let it idle for at least 1 minute.
5. Repeat next procedures three times.
- Increase the engine speed up to between 3,000 and 3,500 rpm and maintain that speed it for 2 minutes
and 50 seconds to 3 minutes.
Never exceed 3 minutes.
- Fully released accelerator pedal and keep engine idle for about 5 seconds.
6. Repeat next procedure 20 times.
- Quickly increase the engine speed up to between 4,000 and 4,500 rpm and maintain that speed it for 25
to 30 seconds.

Revision: August 2013 EC-338 2014 Maxima NAM

 P0448 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
- Fully released accelerator pedal and keep engine idle for at least 35 seconds.
A

EC

JMBIA1516GB

7. Check 1st trip DTC. D

Is 1st trip DTC detected?
YES >> Go to EC-339, "Diagnosis Procedure".
NO >> INSPECTION END E
Diagnosis Procedure INFOID:0000000010095022

1.CHECK RUBBER TUBE F

1. Turn ignition switch OFF.

cardiagn.com
2. Disconnect rubber tube connected to EVAP canister vent control valve.
3. Check the rubber tube for clogging. G
Is the inspection result normal?
YES >> GO TO 2.
NO >> Clean rubber tube using an air blower. H

2.CHECK DRAIN FILTER

Refer to EC-511, "Component Inspection". I
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace drain filter. J
3.CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-340, "Component Inspection".
K
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation". L
4.CHECK IF EVAP CANISTER IS SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached. Refer to FL-14, "Removal and Installation (EVAP Canister)". M
2. Check if water will drain from the EVAP canister.
Does water drain from the EVAP canister?
YES >> GO TO 5. N
NO >> GO TO 7.

P
PBIB1213E

5.CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?

Revision: August 2013 EC-339 2014 Maxima NAM

 P0448 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister. Refer to FL-14, "Removal and Installation (EVAP Canis-
ter)".
7.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check that water is not inside connectors.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
8.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-340, "Component Inspection".

cardiagn.com
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095023

EVAP CANISTER VENT CONTROL VALVE

1.CHECK EVAP CANISTER VENT CONTROL VALVE-I
1. Remove EVAP canister vent control valve from EVAP canister. Refer to FL-16, "Removal and Installation".
2. Check portion (A) of EVAP canister vent control valve for rust.
Is it rusted?
YES >> Replace EVAP canister vent control valve. Refer to FL-
16, "Removal and Installation".
NO >> GO TO 2.

JMBIA0168ZZ

2.CHECK EVAP CANISTER VENT CONTROL VALVE-II

With CONSULT
1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.

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 P0448 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly. A

Condition VENT CONTROL/V Air passage continuity between (A) and (B)
ON Not existed EC
OFF Existed
Operation takes less than 1 second.
C
Without CONSULT
1. Disconnect EVAP canister vent control valve harness connector.
2. Check air passage continuity and operation delay time under the JMBIA0169ZZ

following conditions. D
Check that new O-ring is installed properly.

Condition Air passage continuity between (A) and (B) E

12 V direct current supply between
Not existed
terminals 1 and 2
OFF Existed F
Operation takes less than 1 second.

cardiagn.com
Is the inspection result normal? G
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECK EVAP CANISTER VENT CONTROL VALVE H
With CONSULT
1. Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode. I
3. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
J
Condition VENT CONTROL/V Air passage continuity between (A) and (B)
ON No
OFF Yes K
Operation takes less than 1 second.
Without CONSULT
L
1. Clean the air passage [portion (A) to (B)] of EVAP canister vent
control valve using an air blower. JMBIA0169ZZ

2. Check air passage continuity and operation delay time under the
following conditions. M
Check that new O-ring is installed properly.

Condition Air passage continuity between (A) and (B) N

12 V direct current supply between
No
terminals (1) and (2)
OFF Yes O
Operation takes less than 1 second.
Is the inspection result normal?
P
YES >> INSPECTION END
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation".
DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.

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 P0448 EVAP CANISTER VENT CONTROL VALVE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

PBIB3641E

cardiagn.com

Revision: August 2013 EC-342 2014 Maxima NAM

 P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
A
Description INFOID:0000000010095024

The EVAP control system pressure sensor detects pressure in the EC

purge line. The sensor output voltage to the ECM increases as pres-
sure increases.
C

PBIB3370E E
DTC Logic INFOID:0000000010095025

DTC DETECTION LOGIC F

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
G
• Harness or connectors
(EVAP control system pressure sensor
circuit is shorted.)
[Crankshaft position (CKP) sensor (POS) H
circuit is shorted.]
EVAP control system [Accelerator pedal position (APP) sensor
ECM detects a sloshing signal from the EVAP
P0451 pressure sensor perfor- 2 circuit is shorted.]
control system pressure sensor I
mance (Refrigerant pressure sensor circuit is
shorted.)
• EVAP control system pressure sensor
• CKP sensor (POS)
• APP sensor
J
• Refrigerant pressure sensor

DTC CONFIRMATION PROCEDURE K

NOTE:
Never remove fuel filler cap during DTC confirmation procedure.
1.PRECONDITIONING L
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. M
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
N
With CONSULT>>GO TO 2.
Without CONSULT>>GO TO 5.
2.PERFORM DTC CONFIRMATION PROCEDURE-1 O

With CONSULT
1. Start engine and let it idle for least 40 seconds.
P
NOTE:
Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-344, "Diagnosis Procedure".
NO >> GO TO 3.

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 P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

3.PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT
1. Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE”.
2. Let it idle until “OFF” of “EVAP DIAG READY” changes to “ON”.
NOTE:
It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.
3. Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
4. Turn ignition switch ON.
5. Select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE”.
6. Check that “EVAP LEAK DIAG” indication.
Which is displayed on CONSULT?
CMPLT >> GO TO 4.
YET >> 1. Perform DTC CONFIRMATION PROCEDURE again.
2. GO TO 1.
4.PERFORM DTC CONFIRMATION PROCEDURE-3
With CONSULT
Check 1st trip DTC.

cardiagn.com
Is 1st trip DTC detected?
YES >> Proceed to EC-344, "Diagnosis Procedure".
NO >> INSPECTION END
5.PERFORM DTC CONFIRMATION PROCEDURE-4
With GST
1. Start engine and let it idle for least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-344, "Diagnosis Procedure".
NO >> GO TO 6.
6.PERFORM DTC CONFIRMATION PROCEDURE-5
With GST
1. Let it idle for at least 2 hours.
2. Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
3. Turn ignition switch ON.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-344, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095026

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
Revision: August 2013 EC-344 2014 Maxima NAM
 P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check that water is not inside connectors. A
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness connector. EC
3.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
C
2. Check the voltage between EVAP control system pressure sen-
sor harness connector and ground.

D
EVAP control system pressure sensor
Ground Voltage (V)
Connector Terminal
B41 3 Ground Approx. 5 E
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 4. F
PBIB0138E

4.CHECK SENSOR POWER SUPPLY CIRCUIT

cardiagn.com
Check harness for short to power and short to ground, between the following terminals. G

ECM Sensor
H
Connector Terminal Name Connector Terminal
72 Refrigerant pressure sensor E219 1
F13
76 CKP sensor (POS) F30 1 I
87 APP sensor E40 6
E10
91 EVAP control system pressure sensor B41 3
Is the inspection result normal? J
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors.
K
5.CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to EC-299, "Component Inspection".) L
• Refrigerant pressure sensor (Refer to EC-515, "Diagnosis Procedure".)
Is the inspection result normal?
YES >> GO TO 6. M
NO >> Replace malfunctioning components.
6.CHECK APP SENSOR
Refer to EC-469, "Component Inspection". N
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 7. O

7.REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation". P
2. Go to EC-469, "Special Repair Requirement".

>> INSPECTION END

8.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-346, "Component Inspection".
Is the inspection result normal?
Revision: August 2013 EC-345 2014 Maxima NAM
 P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 9.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095027

1.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.
2. Remove EVAP control system pressure sensor with its harness connector.
Always replace O-ring with a new one.
3. Install a vacuum pump to EVAP control system pressure sensor.
4. Turn ignition switch ON and check output voltage between ECM
terminals under the following conditions.

ECM Applied vacu-

Con- + – um kPa Voltage

cardiagn.com
nector Terminal Terminal (kg/cm2, psi)

86 Not applied 1.8 - 4.8 V

96
(EVAP control
E10 (Sensor -26.7 (-0.272, 2.1 to 2.5 V lower
system pressure
ground) -3.87) than above value
sensor signal) JMBIA1871ZZ

CAUTION:
• Always calibrate the vacuum pump gauge when using it.
• Never apply below -93.3 kPa (-0.952 kg/cm2, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm2,
14.69 psi).
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".

Revision: August 2013 EC-346 2014 Maxima NAM

 P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
A
Description INFOID:0000000010095028

The EVAP control system pressure sensor detects pressure in the EC

purge line. The sensor output voltage to the ECM increases as pres-
sure increases.
C

PBIB3370E E
DTC Logic INFOID:0000000010095029

DTC DETECTION LOGIC F

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
G
• Harness or connectors
(EVAP control system pressure sensor
circuit is open or shorted.)
[Crankshaft position (CKP) sensor (POS) H
circuit is shorted.]
EVAP control system [Accelerator pedal position (APP) sensor
An excessively low voltage from the sensor is
P0452 pressure sensor low in- 2 circuit is shorted.]
sent to ECM. I
put (Refrigerant pressure sensor circuit is
shorted.)
• EVAP control system pressure sensor
• CKP sensor (POS)
• APP sensor
J
• Refrigerant pressure sensor

DTC CONFIRMATION PROCEDURE K

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. L
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. M
TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.
N
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
O
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON. P
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON.
6. Select “DATA MONITOR” mode with CONSULT.
7. Check that “FUEL T/TMP SE” is more than 0°C (32°F).
8. Start engine and wait at least 20 seconds.
9. Check 1st trip DTC.
With GST

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 P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes to ECM harness connector terminals under the following conditions.

ECM
+ –
Connector
Terminal Terminal
95 104
E10
(Fuel tank temperature sensor signal) (Sensor ground)
3. Check that the voltage is less than 4.2 V.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON.
6. Turn ignition switch OFF and wait at least 10 seconds.
7. Start engine and wait at least 20 seconds.
8. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-348, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095030

cardiagn.com
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check that water is not inside connectors.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness connector.
3.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ON.
2. Check the voltage between EVAP control system pressure sen-
sor harness connector and ground.

EVAP control system pressure sensor

Ground Voltage (V)
Connector Terminal
B41 3 Ground Approx. 5
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 4.
PBIB0138E

4.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-
ness connector.

Revision: August 2013 EC-348 2014 Maxima NAM

 P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

EVAP control system pressure sensor ECM A

Continuity
Connector Terminal Connector Terminal
B41 3 E10 91 Existed
EC
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5. C
5.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B29, E29 D
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit. E

6.CHECK SENSOR POWER SUPPLY CIRCUIT

Check harness for short to power and short to ground, between the following terminals. F

ECM Sensor

cardiagn.com
Connector Terminal Name Connector Terminal G
72 Refrigerant pressure sensor E219 1
F13
76 CKP sensor (POS) F30 1
H
87 APP sensor E40 6
E10
91 EVAP control system pressure sensor B41 3
Is the inspection result normal? I
YES >> GO TO 7.
NO >> Repair short to ground or short to power in harness or connectors.
7.CHECK COMPONENTS J

Check the following.

• Crankshaft position sensor (POS) (Refer to EC-299, "Component Inspection".)
K
• Refrigerant pressure sensor (Refer to EC-515, "Diagnosis Procedure".)
Is the inspection result normal?
YES >> GO TO 8. L
NO >> Replace malfunctioning components.
8.CHECK APP SENSOR
Refer to EC-469, "Component Inspection". M
Is the inspection result normal?
YES >> GO TO 15.
NO >> GO TO 9. N
9.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation". O
2. Refer to EC-469, "Special Repair Requirement".

>> INSPECTION END P

10.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-
ness connector.

Revision: August 2013 EC-349 2014 Maxima NAM

 P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

EVAP control system pressure sensor ECM

Continuity
Connector Terminal Connector Terminal
B41 1 E10 96 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-

cardiagn.com
ness connector.

EVAP control system pressure sensor ECM

Continuity
Connector Terminal Connector Terminal
B41 2 E10 86 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13.
13.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.
14.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-350, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 15.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
15.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095031

1.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.
2. Remove EVAP control system pressure sensor with its harness connector.
Always replace O-ring with a new one.
3. Install a vacuum pump to EVAP control system pressure sensor.

Revision: August 2013 EC-350 2014 Maxima NAM

 P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Turn ignition switch ON and check output voltage between ECM
terminals under the following conditions. A

ECM Applied vacu-

+ – um kPa Voltage EC
Con-
2
nector Terminal Terminal (kg/cm , psi)

86 Not applied 1.8 - 4.8 V

(EVAP control
96 C
E10 (Sensor -26.7 (-0.272, 2.1 to 2.5 V lower
system pressure
ground) -3.87) than above value
sensor signal) JMBIA1871ZZ

CAUTION: D
• Always calibrate the vacuum pump gauge when using it.
• Never apply below -93.3 kPa (-0.952 kg/cm2, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm2,
14.69 psi). E
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation". F

cardiagn.com
G

Revision: August 2013 EC-351 2014 Maxima NAM

 P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description INFOID:0000000010095032

The EVAP control system pressure sensor detects pressure in the

purge line. The sensor output voltage to the ECM increases as pres-
sure increases.

PBIB3370E

DTC Logic INFOID:0000000010095033

DTC DETECTION LOGIC

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
(EVAP control system pressure sensor
circuit is open or shorted.)
[Crankshaft position (CKP) sensor (POS)
circuit is shorted.]
[Accelerator pedal position (APP) sensor
2 circuit is shorted.]
(Refrigerant pressure sensor circuit is
EVAP control system
An excessively high voltage from the sensor is shorted.)
P0453 pressure sensor high in-
sent to ECM. • EVAP control system pressure sensor
put
• CKP sensor (POS)
• APP sensor
• Refrigerant pressure sensor
• EVAP canister vent control valve
• EVAP canister
• Drain filter
• Rubber hose from EVAP canister vent
control valve to drain filter
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.

Revision: August 2013 EC-352 2014 Maxima NAM

 P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
5. Turn ignition switch ON.
6. Select “DATA MONITOR” mode with CONSULT. A
7. Check that “FUEL T/TMP SE” is more than 0°C (32°F).
8. Start engine and wait at least 20 seconds.
9. Check 1st trip DTC.
EC
With GST
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes to ECM harness connector terminals.
C
ECM
+ –
Connector D
Terminal Terminal
95 104
E10
(Fuel tank temperature sensor signal) (Sensor ground) E
3. Check that the voltage is less than 4.2 V.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON. JMBIA1872ZZ
F
6. Turn ignition switch OFF and wait at least 10 seconds.
7. Start engine and wait at least 20 seconds.
8. Check 1st trip DTC.

cardiagn.com
Is 1st trip DTC detected? G
YES >> Go to EC-353, "Diagnosis Procedure".
NO >> INSPECTION END
H
Diagnosis Procedure INFOID:0000000010095034

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

I
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection". J
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection. K
2.CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector. L
2. Check that water is not inside connectors.
Is the inspection result normal?
YES >> GO TO 3. M
NO >> Repair or replace harness connector.
3.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON. N
2. Check the voltage between EVAP control system pressure sen-
sor harness connector and ground.
O
EVAP control system pressure sensor
Ground Voltage (V)
Connector Terminal
B41 3 Ground Approx. 5
P

Is the inspection result normal?

YES >> GO TO 10.
NO >> GO TO 4.
PBIB0138E

4.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.
Revision: August 2013 EC-353 2014 Maxima NAM
 P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect ECM harness connector.
3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-
ness connector.

EVAP control system pressure sensor ECM

Continuity
Connector Terminal Connector Terminal
B41 3 E10 91 Existed
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit.

6.CHECK SENSOR POWER SUPPLY CIRCUIT

cardiagn.com
Check harness for short to power and short to ground, between the following terminals.

ECM Sensor
Connector Terminal Name Connector Terminal
72 Refrigerant pressure sensor E219 1
F13
76 CKP sensor (POS) F30 1
87 APP sensor E40 6
E10
91 EVAP control system pressure sensor B41 3
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair short to ground or short to power in harness or connectors.
7.CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to EC-299, "Component Inspection".)
• Refrigerant pressure sensor (Refer to EC-515, "Diagnosis Procedure".)
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace malfunctioning components.
8.CHECK APP SENSOR
Refer to EC-469, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 15.
NO >> GO TO 9.
9.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Refer to EC-469, "Special Repair Requirement".

>> INSPECTION END

10.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.

Revision: August 2013 EC-354 2014 Maxima NAM

 P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect ECM harness connector.
3. Check the continuity between EVAP control system pressure sensor harness connector and ECM har- A
ness connector.

EVAP control system pressure sensor ECM EC

Continuity
Connector Terminal Connector Terminal
B41 1 E10 96 Existed
C
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 12. D
NO >> GO TO 11.
11.DETECT MALFUNCTIONING PART
Check the following. E
• Harness connectors B10, E29
• Harness for open or short between EVAP control system pressure sensor and ECM
F
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND

cardiagn.com
G
SHORT
1. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-
ness connector.
H

EVAP control system pressure sensor ECM

Continuity
Connector Terminal Connector Terminal I
B41 2 E10 86 Existed
2. Also check harness for short to ground and short to power.
J
Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13.
K
13.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29 L
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors. M
14.CHECK RUBBER TUBE
1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging. N
Is the inspection result normal?
YES >> GO TO 15.
NO >> Clean the rubber tube using an air blower, repair or replace rubber tube. O

15.CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to EC-335, "Component Inspection". P
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace EVAP canister vent control valve. Refer to FL-16, "Removal and Installation".
16.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-356, "Component Inspection".
Is the inspection result normal?
Revision: August 2013 EC-355 2014 Maxima NAM
 P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 17.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
17.CHECK DRAIN FILTER
Refer to EC-356, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 18.
NO >> Replace drain filter.
18.CHECK IF EVAP CANISTER IS SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached. Refer to FL-14, "Removal and Installation (EVAP Canister)".
2. Check if water will drain from the EVAP canister.
Does water drain from the EVAP canister?
YES >> GO TO 19.
NO >> GO TO 21.

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PBIB1213E

19.CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?
YES >> GO TO 21.
NO >> GO TO 20.
20.DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister. Refer to FL-14, "Removal and Installation (EVAP Canis-
ter)".
21.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095035

EVAP CONTROL SYSTEM PRESSURE SENSOR

1.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Turn ignition switch OFF.
2. Remove EVAP control system pressure sensor with its harness connector. Refer to FL-17, "Removal and
Installation".
Always replace O-ring with a new one.
3. Install a vacuum pump to EVAP control system pressure sensor.

Revision: August 2013 EC-356 2014 Maxima NAM

 P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Turn ignition switch ON and check output voltage between ECM
terminals under the following conditions. A

ECM Applied vacu-

+ – um kPa Voltage EC
Con-
2
nector Terminal Terminal (kg/cm , psi)

86 Not applied 1.8 - 4.8 V

(EVAP control
96 C
E10 (Sensor -26.7 (-0.272, 2.1 to 2.5 V lower
system pressure
ground) -3.87) than above value
sensor signal) JMBIA1871ZZ

CAUTION: D
• Always calibrate the vacuum pump gauge when using it.
• Never apply below -93.3 kPa (-0.952 kg/cm2, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm2,
14.69 psi). E
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation". F
DRAIN FILTER

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1. Check visually for insect nests in the drain filter air inlet. G
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Blow air into port A and check that it flows freely out of port B. H
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter. I

PBIB3641E K

Revision: August 2013 EC-357 2014 Maxima NAM

 P0455 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0455 EVAP CONTROL SYSTEM
DTC Logic INFOID:0000000010095036

DTC DETECTION LOGIC

This diagnosis detects a very large leakage (fuel filler cap fell off etc.) in EVAP system between the fuel tank
and EVAP canister purge volume control solenoid valve.

cardiagn.com
PBIB3640E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Fuel filler cap remains open or fails to
close.
• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Foreign matter caught in fuel filler cap.
• Leakage is in line between intake mani-
fold and EVAP canister purge volume
control solenoid valve.
• Foreign matter caught in EVAP canister
vent control valve.
• EVAP canister or fuel tank leakage
• EVAP purge line (pipe and rubber tube)
EVAP control system has a very large leakage
EVAP control system leakage
P0455 such as fuel filler cap fell off, EVAP control sys-
gross leakage detected • EVAP purge line rubber tube bent.
tem does not operate properly.
• Loose or disconnected rubber tube
• EVAP canister vent control valve and the
circuit
• Drain filter
• EVAP canister purge volume control so-
lenoid valve and the circuit
• Fuel tank temperature sensor
• O-ring of EVAP canister vent control
valve is missing or damaged.
• EVAP control system pressure sensor
• Refueling EVAP vapor cut valve
• ORVR system leakage
CAUTION:
• Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the
MIL may illuminate.
• If the fuel filler cap is not tightened properly, the MIL may illuminate.
• Use only a genuine NISSAN rubber tube as a replacement.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
Revision: August 2013 EC-358 2014 Maxima NAM
 P0455 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
CAUTION:
Never remove fuel filler cap during the DTC Confirmation Procedure. A
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
EC
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Check that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.
TESTING CONDITION: C
• Perform “DTC WORK SUPPORT” when the fuel level is between 1/4 and 3/4 full, and vehicle is placed
on flat level surface.
• Open engine hood before conducting the following procedures. D
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 4. E
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Tighten fuel filler cap securely until ratcheting sound is heard. F
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

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4. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT. G
5. Check that the following conditions are met.
COOLAN TEMP/S: 0 - 70°C (32 - 158°F)
INT/A TEMP SE: 0 - 60°C (32 - 140°F)
6. Select “EVP V/S LEAK P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode H
with CONSULT.
Follow the instructions displayed.
NOTE: I
If the engine speed cannot be maintained within the range displayed on the CONSULT screen, go to EC-
14, "BASIC INSPECTION : Special Repair Requirement".
Which is displayed on CONSULT screen? J
OK >> INSPECTION END
NG >> GO TO 3.
3.CHECK DTC K
Check DTC.
Which DTC is detected?
L
P0455 >> Go to EC-360, "Diagnosis Procedure".
P0442 >> Go to EC-317, "Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PROCEDURE M
With GST
NOTE:
Be sure to read the explanation of EC-26, "SRT Set Driving Pattern" before driving vehicle. N
1. Start engine.
2. Drive vehicle according to EC-26, "SRT Set Driving Pattern".
3. Stop vehicle.
4. Turn ignition switch OFF and wait at least 10 seconds. O
5. Turn ignition switch ON.
6. Turn ignition switch OFF and wait at least 10 seconds.
7. Turn ignition switch ON. P
8. Check 1st trip DTC.
Is 1st trip DTC detected?
YES-1 >> P0455: Refer to EC-360, "Diagnosis Procedure".
YES-2 >> P0442: Refer to EC-317, "Diagnosis Procedure".
YES-3 >> P0441: Refer to EC-312, "Diagnosis Procedure".
NO >> INSPECTION END

Revision: August 2013 EC-359 2014 Maxima NAM

 P0455 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010095037

1.CHECK FUEL FILLER CAP DESIGN

1. Turn ignition switch OFF.
2. Check for genuine NISSAN fuel filler cap design.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace with genuine NISSAN fuel filler cap.

SEF915U

2.CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.
Is the inspection result normal?
YES >> GO TO 3.

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NO >> Open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Retighten until
ratcheting sound is heard.
3.CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-362, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace fuel filler cap with a genuine one.
5.CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks, improper connection or
disconnection.
Refer to EC-94, "System Diagram".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or reconnect the hose.
6.CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 7.
7.CHECK DRAIN FILTER
Refer to EC-511, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace drain filter.
8.CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following.
• EVAP canister vent control valve is installed properly.

Revision: August 2013 EC-360 2014 Maxima NAM

 P0455 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Refer to FL-16, "Removal and Installation".
• EVAP canister vent control valve. A
Refer to EC-335, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 9. EC
NO >> Repair or replace EVAP canister vent control valve and O-ring.
9.CHECK FOR EVAP LEAKAGE
C
Refer to EC-594, "Inspection".
Is there any leakage in EVAP line?
YES >> Repair or replace. D
NO-1 >> With CONSULT: GO TO 10.
NO-2 >> Without CONSULT: GO TO 11.
10.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION E
With CONSULT
1. Disconnect vacuum hose from EVAP canister purge volume control solenoid valve at EVAP service port.
2. Start engine. F
3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.
4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%.

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5. Check vacuum hose for vacuum.
G
Vacuum should exist.
Is the inspection result normal? H
YES >> GO TO 13.
NO >> GO TO 12.
11.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION I
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Stop engine. J
3. Disconnect vacuum hose from EVAP canister purge volume control solenoid valve at EVAP service port.
4. Start engine and let it idle for at least 80 seconds.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm. K
Vacuum should exist.
Is the inspection result normal? L
YES >> GO TO 14.
NO >> GO TO 12.
12.CHECK VACUUM HOSE M
Check vacuum hoses for clogging or disconnection. Refer to EC-94, "System Diagram".
Is the inspection result normal?
N
YES-1 >> With CONSULT: GO TO 13.
YES-2 >> Without CONSULT: GO TO 14.
NO >> Repair or reconnect the hose.
13.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE O

With CONSULT
1. Start engine. P
2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies
according to the valve opening.
Does engine speed vary according to the valve opening?
YES >> GO TO 15.
NO >> GO TO 14.
14.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Revision: August 2013 EC-361 2014 Maxima NAM
 P0455 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Refer to EC-327, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 15.
NO >> Replace EVAP canister purge volume control solenoid valve.
15.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-272, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace fuel level sensor unit. Refer to FL-6, "Removal and Installation".
16.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-346, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 17.
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
17.CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper
connection. For location, refer to EC-508, "Description".

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Is the inspection result normal?
YES >> GO TO 18.
NO >> Repair or replace hoses and tubes.
18.CHECK RECIRCULATION LINE
Check recirculation line between filler neck tube and fuel tank for clogging, kinks, cracks, looseness and
improper connection.
Is the inspection result normal?
YES >> GO TO 19.
NO >> Repair or replace hose, tube or filler neck tube.
19.CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-511, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 20.
NO >> Replace refueling EVAP vapor cut valve with fuel tank. Refer to FL-10, "Exploded View".
20.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095038

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)
1.CHECK FUEL FILLER CAP
1. Turn ignition switch OFF.
2. Remove fuel filler cap. Refer to FL-10, "Exploded View".

Revision: August 2013 EC-362 2014 Maxima NAM

 P0455 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Wipe clean valve housing.
A

EC

SEF445Y

D
4. Install fuel filler cap adapter (commercial service tool) to fuel filler cap.
5. Check valve opening pressure and vacuum.
E
Pressure: 2
15.3 - 20.0 kPa (0.156 - 0.204 kg/cm , 2.22 -
2.90 psi)
Vacuum: F
−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm2,
−0.87 to −0.48 psi)

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Is the inspection result normal? G
YES >> INSPECTION END
NO >> GO TO 2.
SEF943S

2.REPLACE FUEL FILLER CAP H

Replace fuel filler cap. Refer to FL-10, "Exploded View".

CAUTION:
I
Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may
illuminate.

J
>> INSPECTION END
DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet. K
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
L
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
M
7. If NG, replace drain filter.

O
PBIB3641E

Revision: August 2013 EC-363 2014 Maxima NAM

 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0456 EVAP CONTROL SYSTEM
DTC Logic INFOID:0000000010095039

DTC DETECTION LOGIC

NOTE:
If DTC P0456 is displayed with DTC P0442, first perform the trouble diagnosis for DTC P0456.
This diagnosis detects very small leakage in the EVAP line between fuel tank and EVAP canister purge vol-
ume control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small
leakage diagnosis.
If ECM judges a leakage which corresponds to a very small leakage, the very small leakage P0456 will be
detected.
If ECM judges a leakage equivalent to a small leakage, EVAP small leakage P0442 will be detected.
If ECM judges that there are no leakage, the diagnosis will be OK.

cardiagn.com
PBIB3640E

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close.
• Foreign matter caught in fuel filler cap.
• Leakage is in line between intake manifold and
EVAP canister purge volume control solenoid
valve.
• Foreign matter caught in EVAP canister vent con-
trol valve.
• EVAP canister or fuel tank leakage
• EVAP purge line (pipe and rubber tube) leakage
• EVAP purge line rubber tube bent
Evaporative emission • EVAP system has a very small leak-
• Loose or disconnected rubber tube
control system very age.
P0456 • EVAP canister vent control valve and the circuit
small leakage (negative • EVAP system does not operate prop-
• EVAP canister purge volume control solenoid
pressure check) erly.
valve and the circuit
• Fuel tank temperature sensor
• Drain filter
• O-ring of EVAP canister vent control valve is miss-
ing or damaged
• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Refueling EVAP vapor cut valve
• ORVR system leakage
• Fuel level sensor and the circuit
• Foreign matter caught in EVAP canister purge vol-
ume control solenoid valve

Revision: August 2013 EC-364 2014 Maxima NAM

 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
CAUTION:
• Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the A
MIL may illuminate.
• If the fuel filler cap is not tightened properly, the MIL may illuminate.
• Use only a genuine NISSAN rubber tube as a replacement.
EC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
C
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. D
3. Turn ignition switch OFF and wait at least 10 seconds.
Will CONSULT be used?
YES >> GO TO 2. E
NO >> GO TO 4.
2.PRECONDITIONING F
If DTC CONFIRMATION PROCEDURE has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

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NOTE:
• After repair, make sure that the hoses and clips are installed properly. G
• Check that EVAP hoses are connected to EVAP canister purge volume control solenoid valve prop-
erly.
TESTING CONDITION: H
• Open engine hood before conducting the following procedure.
• If any of following conditions are met just before the DTC CONFIRMATION PROCEDURE, leave the
vehicle for more than 1 hour.
I
- Fuel filler cap is removed.
- Fuel is refilled or drained.
- EVAP component part/parts is/are removed.
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle. J

>> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE K

With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT. L
2. Make sure the following conditions are met.
FUEL LEVEL SE: 0.25 - 1.4 V
COOLAN TEMP/S: 0 - 32°C (32 - 90°F)
FUEL T/TMP SE: 0 - 35°C (32 - 95°F) M
INT A/TEMP SE: More than 0°C (32°F)
If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle), or refill/drain fuel
until the output voltage of the “FUEL LEVEL SE” meets within the range above and leave the vehicle for N
more than 1 hour. Then start from step 1.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select “EVP V/S LEAKAGE P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” O
mode with CONSULT.
Follow the instructions displayed.
NOTE: P
If the engine speed cannot be maintained within the range displayed on CONSULT screen, go to
EC-14, "BASIC INSPECTION : Special Repair Requirement".
Which is displayed on CONSULT?
OK >> INSPECTION END
NG >> Go to EC-366, "Diagnosis Procedure".
4.PERFORM COMPONENT FUNCTION CHECK
Revision: August 2013 EC-365 2014 Maxima NAM
 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Perform Component Function Check. Refer to EC-366, "Component Function Check".
NOTE:
Use Component Function Check to check the overall function of the EVAP very small leakage function. During
this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-366, "Diagnosis Procedure".
Component Function Check INFOID:0000000010095040

1.PERFORM COMPONENT FUNCTION CHECK

With GST
CAUTION:
• Never use compressed air, doing so may damage the EVAP system.
• Never start engine.
• Never exceeded 4.12 kPa (0.042 kg/cm2, 0.6 psi).
1. Attach the EVAP service port adapter (commercial service tool) securely to the EVAP service port.
2. Set the pressure pump and a hose.
3. Also set a vacuum gauge via the 3-way connector and a hose.
4. Turn ignition switch ON.

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5. Connect GST and select Service $08.
6. Using Service $08 control the EVAP canister vent control valve
(close).
7. Apply pressure and make sure the following conditions are sat-
isfied.
Pressure to be applied: 2.7 kPa (0.028 kg/cm2, 0.39 psi)
Time to be waited after the pressure drawn in to the EVAP
system and the pressure to be dropped: 60 seconds and SEF462UI
the pressure should not be dropped more than 0.4 kPa
(0.004 kg/cm2, 0.06 psi).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Go to EC-366, "Diagnosis Procedure".
2.RELEASE PRESSURE
1. Disconnect GST.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Restart engine and let it idle for 90 seconds.
5. Keep engine speed at 2,000 rpm for 30 seconds.
6. Turn ignition switch OFF.
NOTE:
For more information, refer to GST Instruction Manual.

>> INSPECTION END

Diagnosis Procedure INFOID:0000000010095041

1.CHECK FUEL FILLER CAP DESIGN

1. Turn ignition switch OFF.

Revision: August 2013 EC-366 2014 Maxima NAM

 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Check for genuine NISSAN fuel filler cap design.
Is the inspection result normal? A
YES >> GO TO 2.
NO >> Replace with genuine NISSAN fuel filler cap.
EC

SEF915U

2.CHECK FUEL FILLER CAP INSTALLATION D

Check that the cap is tightened properly by rotating the cap clockwise.
Is the inspection result normal? E
YES >> GO TO 3.
NO >> Open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Retighten until
ratcheting sound is heard.
F
3.CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap.

cardiagn.com
Is the inspection result normal? G
YES >> GO TO 5.
NO >> GO TO 4.
H
4.CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-370, "Component Inspection".
Is the inspection result normal? I
YES >> GO TO 5.
NO >> Replace fuel filler cap with a genuine one. Refer to FL-10, "Exploded View".
5.CHECK FOR EVAP LEAKAGE J

Refer to EC-594, "Inspection".

Is there any leakage in EVAP line? K
YES >> Repair or replace malfunctioning part.
NO >> GO TO 6.
6.CHECK DRAIN FILTER L
Refer to EC-511, "Component Inspection".
Is the inspection result normal?
M
YES >> GO TO 7.
NO >> Replace drain filter.
7.CHECK EVAP CANISTER VENT CONTROL VALVE N
Check the following.
• EVAP canister vent control valve is installed properly.
Refer to FL-16, "Removal and Installation".
O
• EVAP canister vent control valve.
Refer to EC-335, "Component Inspection".
Is the inspection result normal?
P
YES >> GO TO 8.
NO >> Repair or replace EVAP canister vent control valve and O-ring.
8.CHECK IF EVAP CANISTER IS SATURATED WITH WATER

Revision: August 2013 EC-367 2014 Maxima NAM

 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Remove EVAP canister with EVAP canister vent control valve and
EVAP control system pressure sensor attached. Refer to FL-17,
"Removal and Installation".
Does water drain from the EVAP canister?
YES >> GO TO 9.
NO-1 >> With CONSULT: GO TO 11.
NO-2 >> Without CONSULT: GO TO 12.

PBIB1213E

9.CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 11.
YES-2 >> Without CONSULT: GO TO 12.
NO >> GO TO 10.
10.DETECT MALFUNCTIONING PART

cardiagn.com
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister. Refer to FL-14, "Removal and Installation (EVAP Canis-
ter)".
11.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT
1. Disconnect vacuum hose connected to EVAP service port and EVAP canister purge volume control sole-
noid valve from EVAP canister purge volume control solenoid valve.
2. Start engine.
3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.
4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%.
5. Check vacuum hose for vacuum.

Vacuum should exist.

Is the inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13.
12.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose connected to EVAP service port and EVAP canister purge volume control sole-
noid valve from EVAP canister purge volume control solenoid valve.
4. Start engine and let it idle for at least 80 seconds.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist.

Is the inspection result normal?
YES >> GO TO 15.
NO >> GO TO 13.
13.CHECK VACUUM HOSE
Revision: August 2013 EC-368 2014 Maxima NAM
 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check vacuum hoses for clogging or disconnection. Refer to EC-94, "System Diagram".
Is the inspection result normal? A
YES >> GO TO 14.
NO >> Repair or reconnect the hose.
14.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE EC

Refer to EC-327, "Component Inspection".

Is the inspection result normal? C
YES >> GO TO 15.
NO >> Replace EVAP canister purge volume control solenoid valve.
15.CHECK FUEL TANK TEMPERATURE SENSOR D
Refer to EC-272, "Component Inspection".
Is the inspection result normal?
E
YES >> GO TO 16.
NO >> Replace fuel level sensor unit. Refer to FL-6, "Removal and Installation".
16.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR F
Refer to EC-346, "Component Inspection".
Is the inspection result normal?

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YES >> GO TO 17. G
NO >> Replace EVAP control system pressure sensor. Refer to FL-17, "Removal and Installation".
17.CHECK EVAP PURGE LINE H
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to EC-94, "System Diagram".
Is the inspection result normal? I
YES >> GO TO 18.
NO >> Repair or reconnect the hose.
18.CLEAN EVAP PURGE LINE J
Clean EVAP purge line (pipe and rubber tube) using air blower.

K
>> GO TO 19.
19.CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper L
connection. For location, refer to EC-508, "Description".
Is the inspection result normal?
YES >> GO TO 20. M
NO >> Repair or replace hoses and tubes.
20.CHECK RECIRCULATION LINE
N
Check recirculation line between filler neck tube and fuel tank for clogging, kinks, cracks, looseness and
improper connection.
Is the inspection result normal?
O
YES >> GO TO 21.
NO >> Repair or replace hose, tube or filler neck tube.
21.CHECK REFUELING EVAP VAPOR CUT VALVE P
Refer to EC-511, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 22.
NO >> Replace refueling EVAP vapor cut valve with fuel tank. Refer to FL-10, "Exploded View".
22.CHECK FUEL LEVEL SENSOR
Refer to MWI-41, "Component Inspection".
Revision: August 2013 EC-369 2014 Maxima NAM
 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the inspection result normal?
YES >> GO TO 23.
NO >> Replace fuel level sensor unit. Refer to FL-6, "Removal and Installation".
23.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095042

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)
1.CHECK FUEL FILLER CAP
1. Turn ignition switch OFF.
2. Remove fuel filler cap. Refer to FL-10, "Exploded View".
3. Wipe clean valve housing.

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SEF445Y

4. Install fuel filler cap adapter (commercial service tool) to fuel filler cap.
5. Check valve opening pressure and vacuum.

Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm2, 2.22 -

2.90 psi)
Vacuum: −6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm2,
−0.87 to −0.48 psi)
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
SEF943S

2.REPLACE FUEL FILLER CAP

Replace fuel filler cap. Refer to FL-10, "Exploded View".
CAUTION:
Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may
illuminate.

>> INSPECTION END

DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.

Revision: August 2013 EC-370 2014 Maxima NAM

 P0456 EVAP CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B. A
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.
EC

PBIB3641E

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Revision: August 2013 EC-371 2014 Maxima NAM

 P0460 FUEL LEVEL SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0460 FUEL LEVEL SENSOR
Description INFOID:0000000010095043

The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combina-
tion meter sends the fuel level sensor signal to the ECM via the CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.
DTC Logic INFOID:0000000010095044

DTC DETECTION LOGIC

NOTE:
• If DTC P0460 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Refer to EC-161, "DTC Logic".
• If DTC P0460 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic".
When the vehicle is parked, the fuel level in the fuel tank is naturally stable. It means that output signal of the
fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunc-
tion is detected.

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
(The CAN communication line is open or
Even though the vehicle is parked, a signal be- shorted.)
Fuel level sensor circuit
P0460 ing varied is sent from the fuel level sensor to • Harness or connectors
noise
ECM. (The sensor circuit is open or shorted.)
• Combination meter
• Fuel level sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait maximum of 2 consecutive minutes.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-372, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095045

1.CHECK COMBINATION METER FUNCTION

Refer to MWI-29, "CONSULT Function (METER/M&A)".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Go to MWI-40, "Diagnosis Procedure".
2.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
Revision: August 2013 EC-372 2014 Maxima NAM
 P0460 FUEL LEVEL SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

>> INSPECTION END A

EC

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Revision: August 2013 EC-373 2014 Maxima NAM

 P0461 FUEL LEVEL SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0461 FUEL LEVEL SENSOR
Description INFOID:0000000010095046

The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combina-
tion meter sends the fuel level sensor signal to the ECM via the CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.
DTC Logic INFOID:0000000010095047

DTC DETECTION LOGIC

NOTE:
• If DTC P0461 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Refer to EC-161, "DTC Logic".
• If DTC P0461 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic".
Driving long distances naturally affect fuel gauge level.
This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has
been driven.

cardiagn.com
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
(The CAN communication line is open or
The output signal of the fuel level sensor does
shorted.)
Fuel level sensor circuit not change within the specified range even
P0461 • Harness or connectors
range/performance though the vehicle has been driven a long dis-
(The sensor circuit is open or shorted.)
tance.
• Combination meter
• Fuel level sensor

DTC CONFIRMATION PROCEDURE

1.PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to EC-374, "Component Function Check".
Use component function check to check the overall function of the fuel level sensor. During this check, a 1st
trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-375, "Diagnosis Procedure".
Component Function Check INFOID:0000000010095048

1.PRECONDITIONING
WARNING:
When performing the following procedure, always observe the handling of the fuel. Refer to FL-6,
"Removal and Installation".
TESTING CONDITION:
Before starting component function check, preparation of draining fuel and refilling fuel is required.
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM COMPONENT FUNCTION CHECK
With CONSULT
NOTE:
Start from step 10, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/
8 Imp gal) in advance.

Revision: August 2013 EC-374 2014 Maxima NAM

 P0461 FUEL LEVEL SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Prepare a fuel container and a spare hose.
2. Release fuel pressure from fuel line, refer to EC-594, "Inspection". A
3. Remove the fuel feed hose on the fuel level sensor unit. Refer to FL-6, "Removal and Installation".
4. Connect a spare fuel hose where the fuel feed hose was removed.
5. Turn ignition switch OFF and wait at least 10 seconds then turn ON.
EC
6. Select “FUEL LEVEL SE” in “DATA MONITOR” mode with CONSULT.
7. Check “FUEL LEVEL SE” output voltage and note it.
8. Select “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT.
9. Touch “ON” and drain fuel approximately 30 (7-7/8 US gal, 6-5/8 Imp gal) and stop it. C
10. Check “FUEL LEVEL SE” output voltage and note it.
11. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).
12. Check “FUEL LEVEL SE” output voltage and note it. D
13. Confirm whether the voltage changes more than 0.03 V during step 7 to 10 and 10 to 12.
Is the inspection result normal?
YES >> INSPECTION END E
NO >> Go to EC-375, "Diagnosis Procedure".
3.PERFORM COMPONENT FUNCTION CHECK
Without CONSULT F
NOTE:
Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/8

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Imp gal) in advance. G
1. Prepare a fuel container and a spare hose.
2. Release fuel pressure from fuel line. Refer to EC-594, "Inspection".
3. Remove the fuel feed hose on the fuel level sensor unit. Refer to FL-6, "Removal and Installation". H
4. Connect a spare fuel hose where the fuel feed hose was removed.
5. Turn ignition switch ON.
6. Drain fuel by 30 (7-7/8 US gal, 6-5/8 Imp gal) from the fuel tank using proper equipment.
7. Confirm that the fuel gauge indication varies. I
8. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).
9. Confirm that the fuel gauge indication varies.
Is the inspection result normal? J
YES >> INSPECTION END
NO >> Go to EC-375, "Diagnosis Procedure".
K
Diagnosis Procedure INFOID:0000000010095049

1.CHECK COMBINATION METER FUNCTION

L
Refer to MWI-29, "CONSULT Function (METER/M&A)".
Is the inspection result normal?
YES >> GO TO 2. M
NO >> Go to MWI-40, "Component Function Check".
2.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". N

>> INSPECTION END

O

Revision: August 2013 EC-375 2014 Maxima NAM

 P0462, P0463 FUEL LEVEL SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0462, P0463 FUEL LEVEL SENSOR
Description INFOID:0000000010095050

The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combina-
tion meter sends the fuel level sensor signal to the ECM via the CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.
DTC Logic INFOID:0000000010095051

DTC DETECTION LOGIC

NOTE:
• If DTC P0462 or P0463 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC
UXXXX.Refer to EC-161, "DTC Logic".
• If DTC P0462 or P0463 is displayed with DTC P0607, first perform the trouble diagnosis for DTC
P0607.Refer to EC-393, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

cardiagn.com
Fuel level sensor circuit An excessively low voltage from the sensor is • Harness or connectors
P0462
low input sent to ECM. (The CAN communication line is open or
shorted.)
• Harness or connectors
Fuel level sensor circuit An excessively high voltage from the sensor is (The sensor circuit is open or shorted.)
P0463
high input sent to ECM. • Combination meter
• Fuel level sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at ignition
switch ON.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-376, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095052

1.CHECK COMBINATION METER FUNCTION

Refer to MWI-29, "CONSULT Function (METER/M&A)".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Go to MWI-40, "Component Function Check".
2.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
Revision: August 2013 E C -3 7 6 2014 Maxima NAM
 P0462, P0463 FUEL LEVEL SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

>> INSPECTION END A

EC

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Revision: August 2013 EC-377 2014 Maxima NAM

 P0500 VSS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0500 VSS
Description INFOID:0000000010095053

ECM receives vehicle speed signals from two different paths via CAN communication line: One is from the
ABS actuator and electric unit (control unit) via the combination unit and the other is from TCM.
DTC Logic INFOID:0000000010095054

DTC DETECTION LOGIC

NOTE:
• If DTC P0500 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P0500 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to EC-
393, "DTC Logic".

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
(Trouble diagnosis content)
• Harness or connector
At 20 km/h (13 MPH), ECM detects the fol-
(The CAN communication line is open
lowing status continuously for 5 seconds or
or shorted.)
more: The difference between a vehicle
• Combination meter
VEH SPEED SEN/CIRC speed calculated by a secondary speed sen-

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P0500 • ABS actuator and electric unit (control
(Vehicle speed sensor) sor transmitted from TCM to ECM via CAN
unit)
communication and the vehicle speed indi-
• Wheel sensor
cated on the combination meter exceeds
• TCM
15km/h (10 MPH).
• Secondary speed sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 10 V or more at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine.
2. Shift the selector lever to D range and wait at least for 2 seconds.
3. Drive the vehicle at least 5 seconds at 20 km/h (13 MPH) or more.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-378, "Diagnosis Procedure"
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095055

1.CHECK DTC WITH TCM

Check DTC with TCM. Refer to TM-38, "CONSULT Function".
Is the inspection result normal?
YES >> GO TO 2.
Revision: August 2013 EC-378 2014 Maxima NAM
 P0500 VSS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) A

Check DTC with ABS actuator and electric unit (control unit). Refer to BRC-21, "CONSULT Function (ABS)".
Is the inspection result normal? EC
YES >> GO TO 3.
NO >> Perform trouble shooting relevant to DTC indicated.
3.CHECK DTC WITH COMBINATION METER C
Check DTC with combination meter. Refer to MWI-29, "CONSULT Function (METER/M&A)".
Is the inspection result normal?
D
YES >> GO TO 4.
NO >> Perform trouble shooting relevant to DTC indicated.
4.CHECK SECONDARY SPEED SENSOR E
Check secondary speed sensor. Refer to TM-60, "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 5. F
NO >> Replace or replace error-detected parts.
5.CHECK WHEEL SENSOR

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Check wheel sensor. Refer to BRC-39, "Diagnosis Procedure".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-41, "Intermittent Incident". H
NO >> Replace or replace error-detected parts.

Revision: August 2013 EC-379 2014 Maxima NAM

 P0506 ISC SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0506 ISC SYSTEM
Description INFOID:0000000010095056

The ECM controls the engine idle speed to a specified level via the fine adjustment of the air, which is let into
the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is var-
ied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the
actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic INFOID:0000000010095057

DTC DETECTION LOGIC

NOTE:
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

cardiagn.com
Idle speed control sys-
The idle speed is less than the target idle speed • Electric throttle control actuator
P0506 tem RPM lower than ex-
by 100 rpm or more. • Intake air leakage
pected

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
If the target idle speed is out of the specified value, perform EC-21, "IDLE AIR VOLUME LEARNING :
Special Repair Requirement", before conducting DTC CONFIRMATION PROCEDURE.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above −10°C(14°F).

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Restart engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-380, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095058

1.CHECK INTAKE AIR LEAKAGE

1. Start engine and let it idle.
2. Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?

Revision: August 2013 EC-380 2014 Maxima NAM

 P0506 ISC SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> Discover air leakage location and repair.
NO >> GO TO 2. A
2.REPLACE ECM
1. Stop engine.
EC
2. Replace ECM.
3. Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment".
C
>> INSPECTION END

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Revision: August 2013 EC-381 2014 Maxima NAM

 P0507 ISC SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0507 ISC SYSTEM
Description INFOID:0000000010095059

The ECM controls the engine idle speed to a specified level via the fine adjustment of the air, which is let into
the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is var-
ied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the
actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic INFOID:0000000010095060

DTC DETECTION LOGIC

NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

cardiagn.com
Idle speed control sys- • Electric throttle control actuator
The idle speed is more than the target idle
P0507 tem RPM higher than • Intake air leakage
speed by 200 rpm or more.
expected • PCV system

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
If the target idle speed is out of the specified value, perform EC-21, "IDLE AIR VOLUME LEARNING :
Special Repair Requirement", before conducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above −10°C(14°F).

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Restart engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-382, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095061

1.CHECK PCV HOSE CONNECTION

Confirm that PCV hose is connected correctly.
Is the inspection result normal?
YES >> GO TO 2.

Revision: August 2013 EC-382 2014 Maxima NAM

 P0507 ISC SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Repair or replace malfunctioning part.
2.CHECK INTAKE AIR LEAKAGE A

1. Start engine and let it idle.

2. Listen for an intake air leakage after the mass air flow sensor.
EC
Is intake air leakage detected?
YES >> Discover air leakage location and repair.
NO >> GO TO 3.
C
3.REPLACE ECM
1. Stop engine.
2. Replace ECM. D
3. Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment".
E
>> INSPECTION END

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Revision: August 2013 EC-383 2014 Maxima NAM

 P050A, P050E COLD START CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P050A, P050E COLD START CONTROL
Description INFOID:0000000010095062

ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
DTC Logic INFOID:0000000010095063

DTC DETECTION LOGIC

NOTE:
If DTC P050A or P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
ECM does not control engine idle speed proper-
Cold start idle air control system-
P050A lywhen engine is started with pre-warming up
performance
condition. • Fuel injection system
The temperature of the catalyst inlet does not • ECM
Cold start engine exhaust temper- • Lack of intake air volume
P050E rise to the proper temperature when the engine
ature too low
is started with pre-warming up condition.

cardiagn.com
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT.
4. Check the indication of “COOLAN TEMP/S”.
With GST
Follow the procedure “With CONSULT” above.
Is the value of “COOLAN TEMP/S” between 4°C (39°F) and 36°C (97°F)?
YES >> GO TO 3.
NO-1 [If it is below 4°C (39°F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 4°C
(39°F) or more. Retry from step 1.
NO-2 [If it is above 36°C (97°F)]>>Cool engine down to less than 36°C (97°F). Retry from step 1.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1. Set the select lever in N range.
2. Start the engine and warm up in idle with the value of “COOLAN TEMP/S” between 15°C (59°F) and 40°C
(104°F) for more than 15 seconds.
3. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-385, "Diagnosis Procedure".

Revision: August 2013 EC-384 2014 Maxima NAM

 P050A, P050E COLD START CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> INSPECTION END
A
Diagnosis Procedure INFOID:0000000010095064

1.PERFORM IDLE AIR VOLUME LEARNING EC

Perform EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 2. C
NO >> Follow the instruction of Idle Air Volume Learning.
2.CHECK INTAKE SYSTEM
D
Check for the cause of intake air volume lacking. Refer to the following.
• Crushed intake air passage
• Intake air passage clogging
• Clogging of throttle body E
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part F
3.CHECK FUEL INJECTION SYSTEM FUNCTION

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Perform DTC Confirmation Procedure for DTC P0171, P0174. Refer to EC-261, "DTC Logic". G
Is the inspection result normal?
YES >> GO TO 4.
NO >> Go to EC-262, "Diagnosis Procedure" for DTC P0171, P0174. H
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC. I
3. Perform DTC Confirmation Procedure.
See EC-384, "DTC Logic".
Is the 1st trip DTC P050A or P050E displayed again? J
YES >> GO TO 5.
NO >> INSPECTION END
5.REPLACE ECM K

1. Replace ECM.
2. Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment". L

>> INSPECTION END

M

Revision: August 2013 EC-385 2014 Maxima NAM

 P0550 PSP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0550 PSP SENSOR
Description INFOID:0000000010095065

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a
power steering load.
This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the
voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve
opening angle to increase the engine speed and adjusts the idle speed for the increased load.
DTC Logic INFOID:0000000010095066

DTC DETECTION LOGIC

NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
Power steering pressure An excessively low or high voltage from the
P0550 (The sensor circuit is open or shorted.)
sensor circuit sensor is sent to ECM.
• Power steering pressure sensor

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DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-386, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095067

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect power steering pressure (PSP) sensor harness connector.
2. Turn ignition switch ON.

Revision: August 2013 EC-386 2014 Maxima NAM

 P0550 PSP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between PSP sensor harness connector and
ground. A

PSP sensor
Ground Voltage
Connector Terminal EC
F40 1 Ground Approx. 5 V
Is the inspection result normal? C
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. JMBIA1596ZZ

D
3.CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. E
3. Check the continuity between PSP sensor harness connector and ECM harness connector.

PSP sensor ECM F

Continuity
Connector Terminal Connector Terminal

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F40 3 F13 48 Existed
G
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4. H
NO >> Repair open circuit, short to ground short to power in harness or connectors.
4.CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between PSP sensor harness connector and ECM harness connector. I

PSP sensor ECM

Continuity J
Connector Terminal Connector Terminal
F40 2 F13 41 Existed
2. Also check harness for short to ground and short to power. K
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. L
5.CHECK PSP SENSOR
Refer to EC-387, "Component Inspection". M
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace PSP sensor. Refer to ST-29, "Exploded View". N
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
O
>> INSPECTION END
Component Inspection INFOID:0000000010095068 P

1.CHECK POWER STEERING PRESSURE SENSOR

1. Reconnect all harness connectors disconnected.
2. Start engine and let it idle.

Revision: August 2013 EC-387 2014 Maxima NAM

 P0550 PSP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM terminals under the following
conditions.

ECM
+ – Condition Voltage
Connector
Terminal Terminal

41 Steering wheel: Being

48 0.5 - 4.5 V
(Power steering turned.
F13 (Sensor
pressure sensor Steering wheel: Not
ground) 0.4 - 0.8 V
signal) being turned. JMBIA1873ZZ

Is the inspection result normal?

YES >> INSPECTION END
NO >> Replace power steering pressure sensor. Refer to ST-29, "Exploded View".

cardiagn.com

Revision: August 2013 EC-388 2014 Maxima NAM

 P0603 ECM POWER SUPPLY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0603 ECM POWER SUPPLY
A
Description INFOID:0000000010095069

Battery voltage is supplied to the ECM even when the ignition switch EC
is turned OFF for the ECM memory function of the DTC memory, the
air-fuel ratio feedback compensation value memory, the idle air vol-
ume learning value memory, etc.
C

PBIA9222J E
DTC Logic INFOID:0000000010095070

DTC DETECTION LOGIC F

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
G
• Harness or connectors
ECM power supply cir- ECM back up RAM system does not function [ECM power supply (back up) circuit is
P0603
cuit properly. open or shorted.]
• ECM H

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING I
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. J
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
K
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
L
1. Turn ignition switch ON and wait at least 10 second.
2. Turn ignition switch OFF and wait at least 5 minutes.
3. Turn ignition switch ON, wait at least 10 seconds.
4. Repeat steps 2 and 3 for five times. M
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-389, "Diagnosis Procedure". N
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095071
O
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK ECM POWER SUPPLY P
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.

Revision: August 2013 EC-389 2014 Maxima NAM

 P0603 ECM POWER SUPPLY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM harness connector and
ground.

ECM
+ – Voltage
Connector Terminal Connector Terminal
F13 77 E10 112 Battery voltage
Is the inspection result normal?
YES >> GO TO 3. JMBIA1889ZZ
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
• 15 A fuse (No. 42)
• IPDM E/R harness connector F10
• Harness for open or short between ECM and battery

>> Repair or replace harness or connectors.

3.CHECK INTERMITTENT INCIDENT

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Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connectors.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC CONFIRMATION PROCEDURE.
See EC-389, "DTC Logic".
Is the 1st trip DTC P0603 displayed again?
YES >> GO TO 5.
NO >> INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment".

>> INSPECTION END

Revision: August 2013 EC-390 2014 Maxima NAM

 P0605 ECM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0605 ECM
A
Description INFOID:0000000010095072

The ECM consists of a microcomputer and connectors for signal EC

input and output and for power supply. The ECM controls the engine.

PBIA9222J E
DTC Logic INFOID:0000000010095073

DTC DETECTION LOGIC F

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
G
A) ECM calculation function is malfunctioning.
P0605 Engine control module B) ECM EEP-ROM system is malfunctioning. • ECM
C) ECM self shut-off function is malfunctioning. H
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING I
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. J
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
K
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
L
1. Turn ignition switch ON.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
M
YES >> Go to EC-392, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B N
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
3. Check 1st trip DTC. O
Is 1st trip DTC detected?
YES >> Go to EC-392, "Diagnosis Procedure".
NO >> GO TO 4. P
4.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
3. Repeat step 2 for 32 times.
4. Check 1st trip DTC.
Is 1st trip DTC detected?

Revision: August 2013 EC-391 2014 Maxima NAM

 P0605 ECM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> Go to EC-392, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095074

1.INSPECTION START
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC CONFIRMATION PROCEDURE.
See EC-391, "DTC Logic".
Is the 1st trip DTC P0605 displayed again?
YES >> GO TO 2.
NO >> INSPECTION END
2.REPLACE ECM
1. Replace ECM.
2. Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment".

>> INSPECTION END

cardiagn.com

Revision: August 2013 EC-392 2014 Maxima NAM

 P0607 ECM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0607 ECM
A
Description INFOID:0000000010095075

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul- EC
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. C
Each control unit transmits/receives data but selectively reads required data only.
DTC Logic INFOID:0000000010095076
D

DTC DETECTION LOGIC

E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
When detecting error during the initial diagno-
P0607 CAN communication bus • ECM
sis of CAN controller of ECM.
F
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE

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G
1. Turn ignition switch ON.
2. Check DTC.
Is DTC detected? H
YES >> Go to EC-393, "Diagnosis Procedure".
NO >> INSPECTION END
I
Diagnosis Procedure INFOID:0000000010095077

1.INSPECTION START
J
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC CONFIRMATION PROCEDURE.
See EC-393, "DTC Logic". K
4. Check DTC.
Is the DTC P0607 displayed again?
Yes >> GO TO 2. L
No >> INSPECTION END
2.REPLACE ECM M
1. Replace ECM.
2. Go to EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment".
N

>> INSPECTION END

O

Revision: August 2013 EC-393 2014 Maxima NAM

 P0643 SENSOR POWER SUPPLY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0643 SENSOR POWER SUPPLY
DTC Logic INFOID:0000000010095078

DTC DETECTION LOGIC

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name
• Harness or connectors
[Accelerator pedal position (APP) sensor 1 cir-
cuit is shorted.]
[Throttle position (TP) sensor circuit is short-
ed.]
[Camshaft position (CMP) sensor (PHASE)
circuit is shorted.)
[Exhaust valve timing (EVT) control position
Sensor power supply ECM detects that the voltage of power sensor circuit is shorted.]
P0643
circuit short source for sensor is excessively low or high. [Power steering pressure (PSP) sensor circuit
is shorted.]
(Battery current sensor circuit is shorted.)
• APP sensor

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• TP sensor
• CMP sensor (PHASE)
• EVT control position sensor
• PSP sensor
• Battery current sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Start engine and let it idle for 1 second.
3. Check DTC
Is DTC detected?
YES >> Go to EC-394, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095079

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
Revision: August 2013 EC-394 2014 Maxima NAM
 P0643 SENSOR POWER SUPPLY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON. A
3. Check the voltage between APP sensor harness connector and
ground.
EC
APP sensor
Ground Voltage (V)
Connector Terminal
E40 5 Ground Approx. 5 C
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 3. D
PBIA9607J

3.CHECK SENSOR POWER SUPPLY CIRCUIT

E
Check harness for short to power and short to ground, between the following terminals.

ECM Sensor
F
Connector Terminal Name Connector Terminal
47 TP sensor F57 1

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51 Battery current sensor F5 1 G
55 PSP sensor F40 3
F13 CMP sensor (PHASE) (bank 1) F55 1
59 H
EVT control position sensor (bank 1) F43 1
CMP sensor (PHASE) (bank 2) F60 1
63
EVT control position sensor (bank 2) F42 1 I
E10 83 APP sensor E40 5
Is the inspection result normal?
J
YES >> GO TO 4.
NO >> Repair short to ground or short to power in harness or connectors.
4.CHECK COMPONENTS K
Check the following.
• Camshaft position sensor (PHASE) (Refer to EC-302, "Component Inspection".)
• EVT control position sensor (Refer to EC-402, "Component Inspection".) L
• Battery current sensor (Refer to EC-415, "Component Inspection".)
• Power steering pressure sensor (Refer to EC-387, "Component Inspection".)
Is the inspection result normal?
M
YES >> GO TO 5.
NO >> Replace malfunctioning component.
5.CHECK TP SENSOR N
Refer to EC-209, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 9. O
NO >> GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR P
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Go to EC-209, "Special Repair Requirement".

>> INSPECTION END

7.CHECK APP SENSOR
Refer to EC-469, "Component Inspection".

Revision: August 2013 EC-395 2014 Maxima NAM

 P0643 SENSOR POWER SUPPLY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Go to EC-469, "Special Repair Requirement".

>> INSPECTION END

9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

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Revision: August 2013 EC-396 2014 Maxima NAM

 P0850 PNP SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P0850 PNP SWITCH
A
Description INFOID:0000000010095080

When the selector lever position is P or N, park/neutral position (PNP) signal from the TCM is sent to ECM. EC
DTC Logic INFOID:0000000010095081

DTC DETECTION LOGIC C

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
D
The park/neutral position (PNP) signal does not • Harness or connectors
Park/neutral position
P0850 change during driving after the engine is start- (The sensor circuit is open or shorted.)
switch
ed. • TCM
E
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
F
Will CONSULT be used?
Will CONSULT be used?

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YES >> GO TO 2. G
NO >> GO TO 5.
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- H
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. I
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 3. J
3.CHECK PNP SIGNAL
With CONSULT
K
1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT. Then check the “P/N POSI SW” signal
under the following conditions.
L
Position (Selector lever) Known-good signal
N or P position ON
M
Except above position OFF
Is the inspection result normal?
YES >> GO TO 4. N
NO >> Go to EC-398, "Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PROCEDURE
O
1. Select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to normal operating temperature.
3. Maintain the following conditions for at least 50 consecutive seconds.
CAUTION: P
Always drive vehicle at a safe speed.

ENG SPEED 1,100 - 6,375 rpm

COOLAN TEMP/S More than 70°C (158°F)
B/FUEL SCHDL 4.0 - 31.8 msec

Revision: August 2013 EC-397 2014 Maxima NAM

 P0850 PNP SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
VHCL SPEED SE More than 64 km/h (40 mph)
Selector lever Suitable position
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-398, "Diagnosis Procedure".
NO >> INSPECTION END
5.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-398, "Component Function Check".
NOTE:
Use component function check to check the overall function of the park/neutral position (PNP) signal circuit.
During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-398, "Diagnosis Procedure".
Component Function Check INFOID:0000000010095082

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.PERFORM COMPONENT FUNCTION CHECK

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1. Turn ignition switch ON.
2. Check the voltage between ECM harness connectors.

ECM
+ – Condition Voltage
Connector
Terminal Terminal
P or N Battery voltage
E10 102 112 Selector lever
Except above Approx. 0 V
Is the inspection result normal?
YES >> INSPECTION END JMBIA1874ZZ

NO >> Go to EC-398, "Diagnosis Procedure".

Diagnosis Procedure INFOID:0000000010095083

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK DTC WITH TCM
Refer to EC-542, "DTC Index".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning part.
2.CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Disconnect TCM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between TCM harness connector and IPDM E/R harness connector.

TCM IPDM E/R

Continuity
Connector Terminal Connector Terminal
F15 20 F10 72 Existed
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
Revision: August 2013 EC-398 2014 Maxima NAM
 P0850 PNP SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT-II A

1. Disconnect IPDM E/R harness connectors.

2. Disconnect ECM harness connector.
EC
3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

ECM IPDM E/R

Continuity C
Connector Terminal Connector Terminal
E10 102 E18 30 Existed
4. Also check harness for short to ground and short to power. D
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4. E
4.DETECT MALFUNCTIONING PART
Check the following. F
• Junction block harness connectors E45, E50
• Harness for open or short between ECM and IPDM E/R

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G
>> Repair or replace harness or connectors.
5.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". H
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".
NO >> Repair or replace malfunctioning part. I

Revision: August 2013 EC-399 2014 Maxima NAM

 P1078, P1084 EVT CONTROL POSITION SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1078, P1084 EVT CONTROL POSITION SENSOR
Description INFOID:0000000010095084

Exhaust valve timing control position sensor detects the concave

groove of the exhaust camshaft rear end.
This sensor signal is used for sensing a position of the exhaust cam-
shaft.
This sensor uses a Hall IC.
Based on the position of the exhaust camshaft, ECM controls
exhaust valve timing control magnet retarder to optimize the shut/
open timing of exhaust valve for the driving condition.

JMBIA0064ZZ

DTC Logic INFOID:0000000010095085

DTC DETECTION LOGIC

NOTE:
If DTC P1078 or P1084 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

cardiagn.com
Refer to EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Exhaust valve timing • Harness or connectors
P1078 control position sensor (The sensor circuit is open or shorted.)
(bank 1) circuit • Exhaust valve timing (EVT) control position
An excessively high or low voltage from
sensor
Exhaust valve timing the sensor is sent to ECM.
• Camshaft (EXH)
P1084 control position sensor • Accumulation of debris to the signal pick-up
(bank 2) circuit portion of the camshaft

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-400, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095086

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.

Revision: August 2013 EC-400 2014 Maxima NAM

 P1078, P1084 EVT CONTROL POSITION SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Repair or replace ground connection.
2.CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-I A

1. Disconnect EVT control position sensor harness connector.

2. Turn ignition switch ON.
EC
3. Check the voltage between EVT control position sensor harness connector and ground.

EVT control position sensor

DTC Ground Voltage (V) C
Bank Connector Terminal
P1078 1 F43 1
Ground Approx. 5
P1084 2 F42 1 D
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. E

3.CHECK EVT CONTROL POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. F
2. Disconnect ECM harness connector.
3. Check the continuity between EVT control position sensor harness connector and ECM harness connec-

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tor.
G

EVT control position sensor ECM

DTC Continuity
Bank Connector Terminal Connector Terminal H
P1078 1 F43 2 64
F13 Existed
P1084 2 F42 2 68
4. Also check harness for short to ground and short to power. I
Is the inspection result normal?
YES >> GO TO 4.
J
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK EVT CONTROL POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between EVT control position sensor harness connector and ECM harness connec- K
tor.

EVT control position sensor ECM L

DTC Continuity
Bank Connector Terminal Connector Terminal
P1078 1 F43 3 66
F13 Existed M
P1084 2 F42 3 71
2. Also check harness for short to ground and short to power.
Is the inspection result normal? N
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK EVT CONTROL POSITION SENSOR O
Refer to EC-402, "Component Inspection".
Is the inspection result normal?
P
YES >> GO TO 6.
NO >> Replace malfunctioning EVT control position sensor. Refer to EM-48, "Exploded View".
6.CHECK CAMSHAFT (EXH)
Check the following.

Revision: August 2013 EC-401 2014 Maxima NAM

 P1078, P1084 EVT CONTROL POSITION SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Accumulation of debris to the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES >> GO TO 7.
NO >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft. Refer to EM-48,
"Exploded View".

JMBIA0059ZZ

7.CHECK INTERMITTENT INCIDENT

Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095087

1.EXHAUST VALVE TIMING CONTROL POSITION SENSOR-I

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1. Turn ignition switch OFF.
2. Disconnect exhaust valve timing control position sensor harness connector.
3. Loosen the fixing bolt of the sensor.
4. Remove the sensor.
5. Visually check the sensor for chipping.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace malfunctioning exhaust valve timing control
position sensor. Refer to EM-48, "Exploded View".

JMBIA0065ZZ

2.EXHAUST VALVE TIMING CONTROL POSITION SENSOR-II

Check resistance exhaust valve timing control position sensor terminals as shown below.

Terminals Resistance
1 (+) - 2 (-)
1 (+) - 3 (-) Except 0 or ∞ Ω [at 25°C (77°F)]
2 (+) - 3 (-)
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace malfunctioning exhaust valve timing control position sensor. Refer to EM-48, "Exploded
View".

Revision: August 2013 EC-402 2014 Maxima NAM

 P1148, P1168 CLOSED LOOP CONTROL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1148, P1168 CLOSED LOOP CONTROL
A
DTC Logic INFOID:0000000010095088

DTC DETECTION LOGIC EC

NOTE:
DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC. C

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
The closed loop control function for bank 1 does D
Closed loop control
P1148 not operate even when vehicle is being driven • Harness or connectors
function (bank 1)
in the specified condition. (The sensor circuit is open or shorted.)
The closed loop control function for bank 2 does • A/F sensor 1
Closed loop control E
P1168 not operate even when vehicle is being driven • A/F sensor 1 heater
function (bank 2)
in the specified condition.

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G

Revision: August 2013 EC-403 2014 Maxima NAM

 P1211 TCS CONTROL UNIT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1211 TCS CONTROL UNIT
Description INFOID:0000000010095089

The malfunction information related to TCS is transferred via the CAN communication line from “ABS actuator
and electric unit (control unit)” to ECM.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
DTC Logic INFOID:0000000010095090

DTC DETECTION LOGIC

Freeze frame data is not stored in the ECM for this self-diagnosis.

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• ABS actuator and electric unit (control
ECM receives malfunction information from
P1211 TCS control unit unit)
“ABS actuator and electric unit (control unit)”.
• TCS related parts

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

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TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 60 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> EC-404, "Diagnosis Procedure"
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095091

Go to BRC-4, "Work Flow".

Revision: August 2013 EC-404 2014 Maxima NAM

 P1212 TCS COMMUNICATION LINE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1212 TCS COMMUNICATION LINE
A
Description INFOID:0000000010095092

This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse EC
signals are exchanged between ECM and “ABS actuator and electric unit (control unit)”.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
C
DTC Logic INFOID:0000000010095093

DTC DETECTION LOGIC D

NOTE:
• If DTC P1212 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Refer to EC-161, "DTC Logic".
E
• If DTC P1212 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic".
Freeze frame data is not stored in the ECM for this self-diagnosis.
F
DTC No. Trouble diagnosis name DTC detecting condition Possible cause

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• Harness or connectors
ECM cannot receive the information from G
(The CAN communication line is open or shorted.)
P1212 TCS communication line “ABS actuator and electric unit (control
• ABS actuator and electric unit (control unit)
unit)” continuously.
• Dead (Weak) battery
H
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- I
ing the next test
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. J
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.
K
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE L
1. Start engine and let it idle for at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected? M
YES >> Go to EC-405, "Diagnosis Procedure".
NO >> INSPECTION END
N
Diagnosis Procedure INFOID:0000000010095094

Go to BRC-4, "Work Flow".

O

Revision: August 2013 EC-405 2014 Maxima NAM

 P1217 ENGINE OVER TEMPERATURE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1217 ENGINE OVER TEMPERATURE
DTC Logic INFOID:0000000010095095

DTC DETECTION LOGIC

NOTE:
• If DTC P1217 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Refer to EC-161, "DTC Logic".
• If DTC P1217 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic".
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Cooling fan does not operate properly (Over- • Harness or connectors
MA-16, "FOR USA AND CANADA : Anti- (The cooling fan circuit is open or shorted.)
Freeze Coolant Mixture Ratio"heat). • IPDM E/R (Cooling fan relays)
• Cooling fan system does not operate proper- • Cooling fan motor
Engine over tempera-

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P1217 ly (Overheat). • Radiator hose
ture (Overheat)
• Engine coolant was not added to the system • Radiator
using the proper filling method. • Radiator cap
• Engine coolant is not within the specified • Water pump
range. • Thermostat
CAUTION:
When a malfunction is indicated, always replace the coolant. Refer to CO-10, "System Inspection".
Also, replace the engine oil. Refer to MA-23, "ENGINE OIL : Changing Engine Oil".
1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Always use
coolant with the proper mixture ratio. Refer to MA-16, "FOR USA AND CANADA : Anti-Freeze Cool-
ant Mixture Ratio" (For NORTH AMERICA) or MA-17, "FOR MEXICO : Engine Coolant Mixture
Ratio" (For MEXICO).
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
DTC CONFIRMATION PROCEDURE
1.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-406, "Component Function Check".
NOTE:
Use component function check to check the overall function of the cooling fan. During this check, a DTC might
not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-407, "Diagnosis Procedure".
Component Function Check INFOID:0000000010095096

1.PERFORM COMPONENT FUNCTION CHECK-I

WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up
pressure to escape. Then turn the cap all the way off.

Revision: August 2013 EC-406 2014 Maxima NAM

 P1217 ENGINE OVER TEMPERATURE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level. A
Is the coolant level in the reservoir tank and/or radiator below the
proper range?
YES >> Go to EC-407, "Diagnosis Procedure". EC
NO >> GO TO 2.

SEF621W

2.PERFORM COMPONENT FUNCTION CHECK-II D

Confirm whether customer filled the coolant or not.

Did customer fill the coolant? E
YES >> Go to EC-407, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK-III F
With CONSULT
1. Turn ignition switch ON.

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2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT. G
3. Check that cooling fan motors-1 and -2 operate at each speed (LOW/MID/HI).
Without CONSULT
Perform IPDM E/R auto active test and check cooling fan motors operation, refer to PCS-11, "Diagnosis H
Description".
Is the inspection result normal?
YES >> INSPECTION END I
NO >> Go to EC-407, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095097
J
1.CHECK COOLING FAN OPERATION
With CONSULT K
1. Turn ignition switch ON.
2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT.
3. Check that cooling fans-1 and -2 operate at each speed (LOW/MID/HI).
L
Without CONSULT
1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to PCS-11, "Diagnosis
Description".
2. Check that cooling fans-1 and -2 operate at each speed (Low/Middle/High). M
Is the inspection result normal?
YES >> GO TO 2.
NO >> Go to EC-486, "Diagnosis Procedure". N

2.CHECK COOLING SYSTEM FOR LEAKAGE-I

Check cooling system for leakage. Refer to CO-10, "System Inspection". O
Is leakage detected?
YES >> GO TO 3.
NO >> GO TO 4. P
3.CHECK COOLING SYSTEM FOR LEAKAGE-II
Check the following for leakage.
• Hose
• Radiator
• Water pump

Revision: August 2013 EC-407 2014 Maxima NAM

 P1217 ENGINE OVER TEMPERATURE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> Repair or replace malfunctioning part.
4.CHECK RADIATOR CAP
Check radiator cap. Refer to CO-10, "System Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace radiator cap.
5.CHECK THERMOSTAT
Check thermostat. Refer to CO-22, "Removal and Installation".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace thermostat. Refer to CO-22, "Removal and Installation".
6.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-203, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace engine coolant temperature sensor. Refer to CO-24, "Removal and Installation".
7.CHECK MAIN 12 CAUSES

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If the cause cannot be isolated, check the following.

Engine Step Inspection item Equipment Standard Reference page

OFF 1 • Blocked radiator • Visual No blocking —
• Blocked condenser
• Blocked radiator grille
• Blocked bumper
2 • Coolant mixture • Coolant tester • MA-15, "FOR USA AND CANADA : Engine Oil Recom-
mendation" (For NORTH AMERICA)
• MA-17, "FOR MEXICO : Engine Oil Recommendation"
(For MEXICO)
3 • Coolant level • Visual Coolant up to MAX level in CO-10, "System Inspec-
reservoir tank and radiator tion"
filler neck
4 • Radiator cap • Pressure tester CO-10, "System Inspection"

ON*2 5 • Coolant leakage • Visual No leakage CO-10, "System Inspec-

tion"

ON*2 6 • Thermostat • Touch the upper and Both hoses should be hot CO-22, "Removal and In-
lower radiator hoses stallation"

ON*1 7 • Cooling fan • CONSULT Operating EC-486, "Component Func-

tion Check"
OFF 8 • Combustion gas leak- • Color checker chemical Negative —
age tester 4 Gas analyzer

ON*3 9 • Coolant temperature • Visual Gauge less than 3/4 when —

gauge driving
• Coolant overflow to res- • Visual No overflow during driving CO-10, "System Inspec-
ervoir tank and idling tion"

OFF*4 10 • Coolant return from res- • Visual Should be initial level in res- CO-10, "System Inspec-
ervoir tank to radiator ervoir tank tion"
OFF 11 • Cylinder head • Straight gauge feeler 0.1 mm (0.004 in) Maximum EM-95, "Inspection After
gauge distortion (warping) Disassembly"
12 • Cylinder block and pis- • Visual No scuffing on cylinder EM-117, "Inspection"
tons walls or piston
*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.

Revision: August 2013 EC-408 2014 Maxima NAM

 P1217 ENGINE OVER TEMPERATURE
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
*3: Drive at 90 km/h (56 MPH) for 30 minutes and then let idle for 10 minutes.
*4: After 60 minutes of cool down time. A
For more information, refer to CO-6, "Troubleshooting Chart".

>> INSPECTION END EC

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G

Revision: August 2013 EC-409 2014 Maxima NAM

 P1225 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1225 TP SENSOR
Description INFOID:0000000010095098

Electric throttle control actuator consists of throttle control motor,

throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

PBIB0145E

DTC Logic INFOID:0000000010095099

DTC DETECTION LOGIC

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Closed throttle position Closed throttle position learning value is exces- • Electric throttle control actuator
P1225
learning performance sively low. (TP sensor 1 and 2)

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-410, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095100

1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.
2. Remove the intake air duct. Refer to EM-24, "Removal and Installation".

Revision: August 2013 EC-410 2014 Maxima NAM

 P1225 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check if foreign matter is caught between the throttle valve (1)
and the housing. A

2: Electric throttle control actuator

: Vehicle front EC
Is the inspection result normal?
YES >> GO TO 2.
NO >> Remove the foreign matter and clean the electric throttle C
control actuator inside, and then perform throttle valve
closed position learning. Refer to EC-21, "THROTTLE ALBIA0611ZZ
VALVE CLOSED POSITION LEARNING : Special D
Repair Requirement".
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation". E
2. Go to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

>> INSPECTION END F

Special Repair Requirement INFOID:0000000010095101

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G
1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
H
>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING I
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END J

Revision: August 2013 EC-411 2014 Maxima NAM

 P1226 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1226 TP SENSOR
Description INFOID:0000000010095102

Electric throttle control actuator consists of throttle control motor,

throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

PBIB0145E

DTC Logic INFOID:0000000010095103

DTC DETECTION LOGIC

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Closed throttle position Closed throttle position learning is not per- • Electric throttle control actuator
P1226
learning performance formed successfully, repeatedly. (TP sensor 1 and 2)

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Repeat steps 2 and 3 for 32 times.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-412, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095104

1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.
2. Remove the intake air duct. Refer to EM-24, "Removal and Installation".

Revision: August 2013 EC-412 2014 Maxima NAM

 P1226 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check if foreign matter is caught between the throttle valve (1)
and the housing. A

2: Electric throttle control actuator

: Vehicle front EC
Is the inspection result normal?
YES >> GO TO 2.
NO >> Remove the foreign matter and clean the electric throttle C
control actuator inside, and then perform throttle valve
closed position learning. Refer to EC-21, "THROTTLE ALBIA0611ZZ
VALVE CLOSED POSITION LEARNING : Special D
Repair Requirement".
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation". E
2. Go to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

>> INSPECTION END F

Special Repair Requirement INFOID:0000000010095105

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G
1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
H
>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING I
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END J

Revision: August 2013 EC-413 2014 Maxima NAM

 P1550 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1550 BATTERY CURRENT SENSOR
Description INFOID:0000000010095106

The power generation voltage variable control enables fuel consumption to be decreased by reducing the
engine load which is caused by the power generation of the generator. The battery current sensor is installed
to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat-
tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is
performed. When performing the power generation voltage variable control, ECM calculates the target power
generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation
command value to IPDM E/R. For the details of the power generation voltage variable control, refer to CHG-8,
"System Description".
CAUTION:
Never connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur.
DTC Logic INFOID:0000000010095107

DTC DETECTION LOGIC

NOTE:

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If DTC P1550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
The output voltage of the battery current • Harness or connectors
Battery current sensor circuit
P1550 sensor remains within the specified (The sensor circuit is open or shorted.)
range/performance
range while engine is running. • Battery current sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-414, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095108

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.

Revision: August 2013 EC-414 2014 Maxima NAM

 P1550 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT A

1. Disconnect battery current sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between battery current sensor harness con-
EC
nector and ground.

Battery current sensor

Ground Voltage (V) C
Connector Terminal
F5 1 Ground Approx. 5
Is the inspection result normal? D
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. JMBIA1602ZZ
E
3.CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
F
2. Disconnect ECM harness connector.
3. Check the continuity between battery current sensor harness connector and ECM harness connector.

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G
Battery current sensor ECM
Continuity
Connector Terminal Connector Terminal
F5 2 F13 44 Existed H
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4. I
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT J
1. Check the continuity between battery current sensor harness connector and ECM harness connector.

Battery current sensor ECM K

Continuity
Connector Terminal Connector Terminal
F5 3 F13 42 Existed
L
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5. M
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK BATTERY CURRENT SENSOR
Refer to EC-415, "Component Inspection". N
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace battery negative cable assembly. O
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". P

>> INSPECTION END

Component Inspection INFOID:0000000010095109

1.CHECK BATTERY CURRENT SENSOR

1. Turn ignition switch OFF.
Revision: August 2013 EC-415 2014 Maxima NAM
 P1550 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Reconnect harness connectors disconnected.
3. Disconnect battery negative cable (1).

: Vehicle front
: To body ground

4. Install jumper cable (A) between battery negative terminal and

body ground.
5. Turn ignition switch ON.

ALBIA0610ZZ

6. Check the voltage between ECM harness connector terminals

under the following conditions.

ECM
+ – Voltage (V)
Connector
Terminal Terminal

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42
44
F13 (Battery current Approx. 2.5
(Sensor ground)
sensor signal)
Before measuring the terminal voltage, confirm that the battery is fully charged. JMBIA1879ZZ

Refer to PG-2, "How to Handle Battery".

Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace battery negative cable assembly.

Revision: August 2013 EC-416 2014 Maxima NAM

 P1551, P1552 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1551, P1552 BATTERY CURRENT SENSOR
A
Description INFOID:0000000010095110

The power generation voltage variable control enables fuel consumption to be decreased by reducing the EC
engine load which is caused by the power generation of the generator. The battery current sensor is installed
to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat-
tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is
performed. When performing the power generation voltage variable control, ECM calculates the target power C
generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation
command value to IPDM E/R. For the details of the power generation voltage variable control, refer to CHG-8,
"System Description". D
CAUTION:
Never connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur. E

DTC Logic INFOID:0000000010095111

F
DTC DETECTION LOGIC
NOTE:

cardiagn.com
If DTC P1551 or P1552 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
G
Refer to EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
H
Battery current sensor circuit An excessively low voltage from the sen-
P1551 • Harness or connectors
low input sor is sent to ECM.
(The sensor circuit is open or shorted.)
Battery current sensor circuit An excessively high voltage from the sen- • Battery current sensor
P1552 I
high input sor is sent to ECM.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING J

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. K
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION: L
Before performing the following procedure, confirm that battery voltage is more than 8 V with ignition
switch ON
M
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
N
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
O
YES >> Go to EC-417, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095112
P
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?

Revision: August 2013 EC-417 2014 Maxima NAM

 P1551, P1552 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect battery current sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between battery current sensor harness con-
nector and ground.

Battery current sensor

Ground Voltage (V)
Connector Terminal
F5 1 Ground Approx. 5
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. JMBIA1602ZZ

3.CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.

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3. Check the continuity between battery current sensor harness connector and ECM harness connector.

Battery current sensor ECM

Continuity
Connector Terminal Connector Terminal
F5 2 F13 44 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between battery current sensor harness connector and ECM harness connector.

Battery current sensor ECM

Continuity
Connector Terminal Connector Terminal
F5 3 F13 42 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK BATTERY CURRENT SENSOR
Refer to EC-425, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace battery negative cable assembly.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Revision: August 2013 EC-418 2014 Maxima NAM

 P1551, P1552 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Component Inspection INFOID:0000000010095113

A
1.CHECK BATTERY CURRENT SENSOR
1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected. EC
3. Disconnect battery negative cable (1).

: Vehicle front C
: To body ground

4. Install jumper cable (A) between battery negative terminal and D

body ground.
5. Turn ignition switch ON.

E
ALBIA0610ZZ

6. Check the voltage between ECM harness connector terminals F

under the following conditions.

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ECM G
+ – Voltage (V)
Connector
Terminal Terminal
H
42
44
F13 (Battery current Approx. 2.5
(Sensor ground)
sensor signal)
I
Before measuring the terminal voltage, confirm that the battery is fully charged. JMBIA1879ZZ

Refer to PG-2, "How to Handle Battery".

Is the inspection result normal?
J
YES >> INSPECTION END
NO >> Replace battery negative cable assembly.
K

Revision: August 2013 EC-419 2014 Maxima NAM

 P1553 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1553 BATTERY CURRENT SENSOR
Description INFOID:0000000010095114

The power generation voltage variable control enables fuel consumption to be decreased by reducing the
engine load which is caused by the power generation of the generator. The battery current sensor is installed
to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat-
tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is
performed. When performing the power generation voltage variable control, ECM calculates the target power
generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation
command value to IPDM E/R. For the details of the power generation voltage variable control, refer to CHG-8,
"System Description".
CAUTION:
Never connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur.
DTC Logic INFOID:0000000010095115

DTC DETECTION LOGIC

NOTE:

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If DTC P1553 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
The signal voltage transmitted from the • Harness or connectors
Battery current sensor perfor-
P1553 sensor to ECM is higher than the amount (The sensor circuit is open or shorted.)
mance
of the maximum power generation. • Battery current sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-420, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095116

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.

Revision: August 2013 EC-420 2014 Maxima NAM

 P1553 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT A

1. Disconnect battery current sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between battery current sensor harness con-
EC
nector and ground.

Battery current sensor

Ground Voltage (V) C
Connector Terminal
F5 1 Ground Approx. 5
Is the inspection result normal? D
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. JMBIA1602ZZ
E
3.CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
F
2. Disconnect ECM harness connector.
3. Check the continuity between battery current sensor harness connector and ECM harness connector.

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G
Battery current sensor ECM
Continuity
Connector Terminal Connector Terminal
F5 2 F13 44 Existed H
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4. I
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT J
1. Check the continuity between battery current sensor harness connector and ECM harness connector.

Battery current sensor ECM K

Continuity
Connector Terminal Connector Terminal
F5 3 F13 42 Existed
L
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5. M
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK BATTERY CURRENT SENSOR
Refer to EC-425, "Component Inspection". N
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace battery negative cable assembly. O
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". P

>> INSPECTION END

Component Inspection INFOID:0000000010095117

1.CHECK BATTERY CURRENT SENSOR

1. Turn ignition switch OFF.
Revision: August 2013 EC-421 2014 Maxima NAM
 P1553 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Reconnect harness connectors disconnected.
3. Disconnect battery negative cable (1).

: Vehicle front
: To body ground

4. Install jumper cable (A) between battery negative terminal and

body ground.
5. Turn ignition switch ON.

ALBIA0610ZZ

6. Check the voltage between ECM harness connector terminals

under the following conditions.

ECM
+ – Voltage (V)
Connector
Terminal Terminal

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42
44
F13 (Battery current Approx. 2.5
(Sensor ground)
sensor signal)
Before measuring the terminal voltage, confirm that the battery is fully charged. JMBIA1879ZZ

Refer to PG-2, "How to Handle Battery".

Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace battery negative cable assembly.

Revision: August 2013 EC-422 2014 Maxima NAM

 P1554 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1554 BATTERY CURRENT SENSOR
A
Description INFOID:0000000010095118

The power generation voltage variable control enables fuel consumption to be decreased by reducing the EC
engine load which is caused by the power generation of the generator. The battery current sensor is installed
to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat-
tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is
performed. When performing the power generation voltage variable control, ECM calculates the target power C
generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation
command value to IPDM E/R. For the details of the power generation voltage variable control, refer to CHG-8,
"System Description". D
CAUTION:
Never connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur. E

DTC Logic INFOID:0000000010095119

F
DTC DETECTION LOGIC
NOTE:

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If DTC P1554 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
G
EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
H
The output voltage of the battery current • Harness or connectors
Battery current sensor perfor-
P1554 sensor is lower than the specified value (The sensor circuit is open or shorted.)
mance
while the battery voltage is high enough. • Battery current sensor
I
DTC CONFIRMATION PROCEDURE
1.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-423, "Component Function Check". J
NOTE:
Use component function check to check the overall function of the battery current sensor circuit. During this
check, a 1st trip DTC might not be confirmed. K
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-424, "Diagnosis Procedure". L

Component Function Check INFOID:0000000010095120

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". M

1.PRECONDITIONING
TESTING CONDITION: N
• Before performing the following procedure, confirm that battery voltage is more than 12.8 V at idle.
• Before performing the following procedure, confirm that all load switches and A/C switch are turned
OFF.
O

>> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK P
With CONSULT
1. Start engine and let it idle.
2. Select “BAT CUR SEN” in “DATA MONITOR” mode with CONSULT.
3. Check “BAT CUR SEN” indication for 10 seconds.
“BAT CUR SEN” should be above 2,300 mV at least once.
Without CONSULT
1. Start engine and let it idle.
Revision: August 2013 EC-423 2014 Maxima NAM
 P1554 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Check voltage between ECM harness connector terminals
under the following conditions.

ECM
Terminal Terminal Voltage (V)
Connector
+ –
42
44
F13 (Battery current Above 2.3 at least once
(Sensor ground)
sensor signal)
Is the inspection result normal? JMBIA1879ZZ

YES >> INSPECTION END

NO >> Go to EC-424, "Diagnosis Procedure"
Diagnosis Procedure INFOID:0000000010095121

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".

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Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect battery current sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between battery current sensor harness con-
nector and ground.

Battery current sensor

Ground Voltage (V)
Connector Terminal
F5 1 Ground Approx. 5
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. JMBIA1602ZZ

3.CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between battery current sensor harness connector and ECM harness connector.

Battery current sensor ECM

Continuity
Connector Terminal Connector Terminal
F5 2 F13 44 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between battery current sensor harness connector and ECM harness connector.

Revision: August 2013 EC-424 2014 Maxima NAM

 P1554 BATTERY CURRENT SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

Battery current sensor ECM A

Continuity
Connector Terminal Connector Terminal
F5 3 F13 42 Existed
EC
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5. C
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK BATTERY CURRENT SENSOR
D
Refer to EC-425, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 6. E
NO >> Replace battery negative cable assembly.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". F

>> INSPECTION END

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G
Component Inspection INFOID:0000000010095122

1.CHECK BATTERY CURRENT SENSOR H

1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected.
3. Disconnect battery negative cable (1). I

: Vehicle front
: To body ground J
4. Install jumper cable (A) between battery negative terminal and
body ground.
5. Turn ignition switch ON. K

ALBIA0610ZZ L

6. Check the voltage between ECM harness connector terminals

under the following conditions. M

ECM
+ – Voltage (V) N
Connector
Terminal Terminal
42
44 O
F13 (Battery current Approx. 2.5
(Sensor ground)
sensor signal)
Before measuring the terminal voltage, confirm that the battery is fully charged. JMBIA1879ZZ

Refer to PG-2, "How to Handle Battery". P

Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace battery negative cable assembly.

Revision: August 2013 EC-425 2014 Maxima NAM

 P1564 ASCD STEERING SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1564 ASCD STEERING SWITCH
Description INFOID:0000000010095123

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.
Refer to EC-68, "System Diagram" for the ASCD function.
DTC Logic INFOID:0000000010095124

DTC DETECTION LOGIC

NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to
EC-391, "DTC Logic".

Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name
• An excessively high voltage signal from the
ASCD steering switch is sent to ECM.
• Harness or connectors
• ECM detects that input signal from the
(The switch circuit is open or shorted.)
P1564 ASCD steering switch ASCD steering switch is out of the specified
• ASCD steering switch

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range.
• ECM
• ECM detects that the ASCD steering switch
is stuck ON.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.
4. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
5. Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.
6. Check DTC.
Is DTC detected?
YES >> Go to EC-426, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095125

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK ASCD STEERING SWITCH CIRCUIT
Revision: August 2013 EC-426 2014 Maxima NAM
 P1564 ASCD STEERING SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
With CONSULT
1. Turn ignition switch ON. A
2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with
CONSULT.
3. Check each item indication under the following conditions. EC

Monitor item Condition Indication

Pressed ON C
MAIN SW MAIN switch
Released OFF
Pressed ON
CANCEL SW CANCEL switch D
Released OFF

RESUME/ACCEL- Pressed ON
RESUME/ACC SW
ERATE switch Released OFF E
Pressed ON
SET SW SET/COAST switch
Released OFF
F
Without CONSULT
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals

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under the following conditions. G

ECM
H
+ – Condition Voltage (V)
Connector
Terminal Terminal
MAIN switch: Pressed Approx. 0 I
CANCEL switch: Pressed Approx. 1
85 92
SET/COAST switch:
(ASCD (ASCD Approx. 2 JMBIA1880ZZ

E10 steering steering

Pressed J
switch switch RESUME/ACCELERATE
Approx. 3
signal) ground) switch: Pressed
All ASCD steering switches: K
Approx. 4
Released
Is the inspection result normal?
YES >> GO TO 8. L
NO >> GO TO 3.
3.CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
M
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect combination switch harness connector.
4. Check the continuity between combination switch and ECM harness connector. N

Combination switch ECM

Continuity O
Terminal Connector Terminal
16 E10 92 Existed
5. Also check harness for short to ground and short to power. P
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E30, M11

Revision: August 2013 EC-427 2014 Maxima NAM

 P1564 ASCD STEERING SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between combination switch and ECM harness connector.

Combination switch ECM

Continuity
Terminal Connector Terminal
13 E10 85 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E30, M1

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• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

>> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK ASCD STEERING SWITCH
Refer to EC-428, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace steering wheel. Refer to ST-17, "Removal and Installation".
8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095126

1.CHECK ASCD STEERING SWITCH

1. Turn ignition switch OFF.
2. Disconnect combination switch (spiral cable) harness connector.
3. Check resistance between combination switch harness connec-
tor terminals as per the following.

Combination switch
Condition Resistance (Ω)
Terminals
MAIN switch: Pressed Approx. 0
CANCEL switch: Pressed Approx. 250
13 and 16 SET/COAST switch: Pressed Approx. 660
RESUME/ACCELERATE switch: Pressed Approx. 1,480 JMBIA1625ZZ

All ASCD steering switches: Released Approx. 4,000

Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace steering wheel. Refer to ST-17, "Removal and Installation".

Revision: August 2013 EC-428 2014 Maxima NAM

 P1572 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1572 ASCD BRAKE SWITCH
A
Description INFOID:0000000010095127

When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. EC
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
Refer to EC-68, "System Diagram" for the ASCD function.
DTC Logic INFOID:0000000010095128 C

DTC DETECTION LOGIC

NOTE: D
• If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-391, "DTC Logic".
• This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
E
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch is turned OFF. And even when malfunction A is detected
in two consecutive trips, DTC is not stored in ECM memory.
F
Trouble diagnosis
DTC No. DTC detecting condition Possible cause
name

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When the vehicle speed is above 30 km/h • Harness or connectors G
(19 MPH), ON signals from the stop lamp (The stop lamp switch circuit is shorted.)
A)
switch and the ASCD brake switch are sent • Harness or connectors
to the ECM at the same time. (The ASCD brake switch circuit is shorted.)
P1572 ASCD brake switch • Stop lamp switch H
ASCD brake switch signal is not sent to • ASCD brake switch
B) ECM for extremely long time while the ve- • Incorrect stop lamp switch installation
hicle is being driven. • Incorrect ASCD brake switch installation
• ECM I

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING J
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. K
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
NOTE: L
The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure
for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B can
be detected.
M

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE N
With CONSULT
1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT. O
3. Press MAIN switch and check that CRUISE lamp illuminate.
4. Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION:
P
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.

VHCL SPEED SE More than 30 km/h (19 mph)

Selector lever Suitable position

Revision: August 2013 EC-429 2014 Maxima NAM

 P1572 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
5. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-430, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.

VHCL SPEED SE More than 30 km/h (19 mph)

Selector lever Suitable position
Depress the brake pedal for more than
Driving location five seconds so as not to come off from

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the above-mentioned vehicle speed.
2. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Go to EC-430, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095129

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK OVERALL FUNCTION-I
With CONSULT
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.
3. Check “BRAKE SW1” indication under the following conditions.

Monitor item Condition Indication

Slightly depressed OFF
BRAKE SW1 Brake pedal
Fully released ON

Without CONSULT
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connectors.

ECM
+ - Condition Voltage
Connector
Terminal Terminal
110 Slightly de-
Approx. 0 V
(ASCD pressed
E10 brake 112 Brake pedal
switch Fully released Battery voltage
signal) JMBIA1881ZZ

Is the inspection result normal?

Revision: August 2013 EC-430 2014 Maxima NAM

 P1572 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 2.
NO >> GO TO 3. A
2.CHECK OVERALL FUNCTION-II
With CONSULT EC
Check “BRAKE SW2” indication in “DATA MONITOR” mode.

Monitor item Condition Indication

C
Slightly depressed ON
BRAKE SW2 Brake pedal
Fully released OFF
D
Without CONSULT
Check the voltage between ECM harness connectors.
E
ECM
+ - Condition Voltage
Connector F
Terminal Terminal
106 Slightly de- Battery

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(Stop pressed voltage
E10 lamp 112 Brake pedal G
switch Fully released Approx. 0 V
signal) JMBIA1882ZZ

Is the inspection result normal? H

YES >> GO TO 13.
NO >> GO TO 8.
3.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT I

1. Turn ignition switch OFF.

2. Disconnect ASCD brake switch harness connector.
J
3. Turn ignition switch ON.
4. Check the voltage between ASCD brake switch harness con-
nector and ground.
K
ASCD brake switch
Ground Voltage
Connector Terminal
L
E37 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 5. M
NO >> GO TO 4.
PBIB0857E

4.DETECT MALFUNCTIONING PART N

Check the following.
• Fuse block (J/B) connector E6
• Junction block harness connectors E44, E46
O
• 10 A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse

P
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ASCD brake switch harness connector and ECM harness connector.

Revision: August 2013 EC-431 2014 Maxima NAM

 P1572 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ASCD brake switch ECM

Continuity
Connector Terminal Connector Terminal
E37 2 E10 110 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
• Junction block connectors E45, E46
• Harness for open or short between ASCD brake switch and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK ASCD BRAKE SWITCH
Refer to EC-433, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?

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YES >> GO TO 13.
NO >> Replace ASCD brake switch. Refer to BR-18, "Removal and Installation".
8.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check the voltage between stop lamp switch harness connector
and ground.

Stop lamp switch

Ground Voltage
Connector Terminal
E38 3 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
PBIB2102E

9.DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E6
• 10 A fuse (No. 7)
• Harness for open or short between stop lamp switch and battery

>> Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between stop lamp switch harness connector and ECM harness connector.

Stop lamp switch ECM

Continuity
Connector Terminal Connector Terminal
E38 4 E10 106 Existed
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 12.

Revision: August 2013 EC-432 2014 Maxima NAM

 P1572 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> GO TO 11.
11.DETECT MALFUNCTIONING PART A

Check the following.

• Fuse block (J/B) connector E6
EC
• Junction block connectors E44, E45
• Harness for open or short between stop lamp switch and ECM

C
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK STOP LAMP SWITCH
Refer to EC-433, "Component Inspection (Stop Lamp Switch)" D
Is the inspection result normal?
YES >> GO TO 13.
NO >> Replace stop lamp switch. Refer to BR-18, "Removal and Installation". E
13.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". F

>> INSPECTION END

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Component Inspection (ASCD Brake Switch) INFOID:0000000010095130
G

1.CHECK ASCD BRAKE SWITCH-I

H
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check the continuity between ASCD brake switch terminals
under the following conditions. I

Terminals Condition Continuity

J
Fully released. Existed
1 and 2 Brake pedal
Slightly depressed. Not existed
Is the inspection result normal? K
YES >> INSPECTION END
NO >> GO TO 2.
SEC023D
L
2.CHECK ASCD BRAKE SWITCH-II
1. Adjust ASCD brake switch installation. Refer to BR-18, "Removal and Installation".
2. Check the continuity between ASCD brake switch terminals M
under the following conditions.

Terminals Condition Continuity N

Fully released. Existed
1 and 2 Brake pedal
Slightly depressed. Not existed
O
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace ASCD brake switch. Refer to BR-18, "Removal
and Installation". SEC023D P

Component Inspection (Stop Lamp Switch) INFOID:0000000010095131

1.CHECK STOP LAMP SWITCH-I

1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.

Revision: August 2013 EC-433 2014 Maxima NAM

 P1572 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check harness continuity between stop lamp switch terminals
under the following conditions.

Terminals Condition Continuity

Fully released Not existed
3 and 4 Brake pedal
Slightly depressed Existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
PBIB2103E

2.CHECK STOP LAMP SWITCH-II

1. Adjust stop lamp switch installation. Refer to BR-14, "Inspection and Adjustment".
2. Check harness continuity between stop lamp switch terminals
under the following conditions.

Terminals Condition Continuity

Fully released Not existed
3 and 4 Brake pedal
Slightly depressed Existed

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Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp switch. Refer to BR-18, "Removal
and Installation". PBIB2103E

Revision: August 2013 EC-434 2014 Maxima NAM

 P1574 ASCD VEHICLE SPEED SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1574 ASCD VEHICLE SPEED SENSOR
A
Description INFOID:0000000010095132

The ECM receives two vehicle speed signals via the CAN communication line. One is sent from combination EC
meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con-
trol. Refer to EC-68, "System Diagram" for ASCD functions.
DTC Logic INFOID:0000000010095133 C

DTC DETECTION LOGIC

NOTE: D
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-378, "DTC Logic".
E
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-391, "DTC Logic".
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic". F

Trouble diagnosis
DTC No. DTC detecting condition Possible cause

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name
G
• Harness or connectors
(The CAN communication line is open or
shorted.)
ASCD vehicle speed The difference between the two vehicle speed • Combination meter H
P1574
sensor signals is out of the specified range. • ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM I

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING J
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. K
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
L
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE M
1. Start engine (VDC switch OFF).
2. Drive the vehicle at more than 40 km/h (25 MPH).
CAUTION:
Always drive vehicle at a safe speed. N
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle. O
3. Check DTC.
Is DTC detected?
YES >> Go to EC-435, "Diagnosis Procedure". P
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095134

1.CHECK DTC WITH TCM

Check DTC with TCM. Refer to TM-36, "Diagnosis Description".
Is the inspection result normal?
Revision: August 2013 EC-435 2014 Maxima NAM
 P1574 ASCD VEHICLE SPEED SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 2.
NO >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to BRC-21, "CONSULT Function (ABS)".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part.
3.CHECK COMBINATION METER FUNCTION
Refer to MWI-29, "CONSULT Function (METER/M&A)".

>> INSPECTION END

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Revision: August 2013 EC-436 2014 Maxima NAM

 P1700 CVT CONTROL SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1700 CVT CONTROL SYSTEM
A
Description INFOID:0000000010095135

This DTC is displayed with other DTC regarding TCM. Perform the trouble diagnosis for corresponding DTC. EC
Refer to EC-542, "DTC Index". When this DTC is detected, the ASCD control is canceled.

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Revision: August 2013 EC-437 2014 Maxima NAM

 P1715 INPUT SPEED SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1715 INPUT SPEED SENSOR
Description INFOID:0000000010095136

ECM receives input speed sensor signal from TCM via the CAN communication line. ECM uses this signal for
engine control.
DTC Logic INFOID:0000000010095137

DTC DETECTION LOGIC

NOTE:
• If DTC P1715 is displayed with DTC UXXXX first perform the trouble diagnosis for DTC UXXXX. Refer
to EC-161, "DTC Logic".
• If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
to EC-296, "DTC Logic".
• If DTC P1715 is displayed with DTC P0340, P0345, first perform the trouble diagnosis for DTC P0340,
P0345. Refer to EC-300, "DTC Logic".
• If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-391, "DTC Logic".
• If DTC P1715 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic".

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DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
Input speed sensor signal is different from
(The CAN communication line is open or shorted.)
Input speed sensor the theoretical value calculated by ECM
P1715 • Harness or connectors
(TCM output) from output speed sensor signal and en-
(Input speed sensor circuit is open or shorted.)
gine rpm signal.
• TCM

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine.
2. Drive vehicle at a speed of more than 50 km/h (31 MPH) for at least 5 seconds.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-438, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095138

1.CHECK DTC WITH TCM

Check DTC with TCM. Refer to TM-36, "Diagnosis Description".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform trouble shooting relevant to DTC indicated.
2.REPLACE TCM
Replace TCM. Refer to TM-168, "Removal and Installation".

Revision: August 2013 EC-438 2014 Maxima NAM

 P1715 INPUT SPEED SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

>> INSPECTION END A

EC

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Revision: August 2013 EC-439 2014 Maxima NAM

 P1720 VSS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1720 VSS
Description INFOID:0000000010095139

ECM receives two vehicle speed signals via the CAN communication line. One is sent from “ABS actuator and
electric unit (control unit)” via the combination meter, and the other is from TCM (Transmission control mod-
ule). ECM uses these signals for engine control.
DTC Logic INFOID:0000000010095140

DTC DETECTION LOGIC

NOTE:
• If DTC P1720 is displayed with DTC UXXXX first perform the trouble diagnosis for DTC UXXXX. Refer
to EC-161, "DTC Logic".
• If DTC P1720 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-393, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
(Output speed sensor circuit is open or short-
ed.)

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• Harness or connectors
Vehicle speed sensor The difference between two vehicle speed (Wheel sensor circuit is open or shorted.)
P1720
(TCM output) signals is out of the specified range. • TCM
• Output speed sensor
• ABS actuator and electric unit (control unit)
• Wheel sensor
• Combination meter

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine.
2. Drive vehicle at a speed of 20 km/h (12 MPH) or more for at least 5 seconds without depressing the brake
pedal.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-440, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095141

1.CHECK DTC WITH TCM

Check DTC with TCM. Refer to TM-36, "Diagnosis Description".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to BRC-21, "CONSULT Function (ABS)".

Revision: August 2013 EC-440 2014 Maxima NAM

 P1720 VSS
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the inspection result normal?
YES >> GO TO 3. A
NO >> perform trouble shooting relevant to DTC indicated.
3.CHECK COMBINATION METER FUNCTION
EC
Refer to MWI-29, "CONSULT Function (METER/M&A)".

>> INSPECTION END C

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Revision: August 2013 EC-441 2014 Maxima NAM

 P1800 VIAS CONTROL SOLENOID VALVE 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1800 VIAS CONTROL SOLENOID VALVE 1
Description INFOID:0000000010095142

The VIAS control solenoid valve 1 cuts the intake manifold vacuum signal for power valve 1 control. It
responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake
manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and sends the vac-
uum signal to the power valve actuator 1.
DTC Logic INFOID:0000000010095143

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
An excessively low or high voltage signal
VIAS control solenoid valve 1 (The solenoid valve 1 circuit is open or
P1800 is sent to ECM via the VIAS control sole-
circuit shorted.)
noid valve 1.
• VIAS control solenoid valve 1

DTC CONFIRMATION PROCEDURE

1.CONDITIONING

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If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-442, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095144

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK VIAS CONTROL SOLENOID VALVE 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between VIAS control solenoid valve 1 har-
ness connector and ground.

VIAS control solenoid valve 1

Ground Voltage
Connector Terminal
F63 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIB0080E

Revision: August 2013 EC-442 2014 Maxima NAM

 P1800 VIAS CONTROL SOLENOID VALVE 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK VIAS CONTROL SOLENOID VALVE 1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between VIAS control solenoid valve 1 harness connector and ECM harness con-
EC
nector.

VIAS control solenoid valve 1 ECM

Continuity C
Connector Terminal Connector Terminal
F63 2 F14 27 Existed
4. Also check harness for short to ground and short to power. D
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. E
3.CHECK VIAS CONTROL SOLENOID VALVE 1
Refer to EC-443, "Component Inspection". F
Is the inspection result normal?
YES >> GO TO 4.

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NO >> Replace VIAS control solenoid valve 1. Refer to EM-25, "Removal and Installation". G
4.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
H

>> INSPECTION END

Component Inspection INFOID:0000000010095145 I

1.CHECK VIAS CONTROL SOLENOID VALVE 1

J
With CONSULT
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect vacuum hoses connected to VIAS control solenoid valve 1. K
4. Turn ignition switch ON.
5. Select “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.
6. Check air passage continuity and operation delay time under the L
following conditions.

Condition Air passage continuity Air passage continuity

M
(VIAS S/V 1) between (A) and (B) between (A) and (C)
ON Existed Not existed
OFF Not existed Existed N

JMBIA0180ZZ
O

Without CONSULT
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve 1 harness connector. P
3. Disconnect vacuum hoses connected to VIAS volume control solenoid valve 1.

Revision: August 2013 EC-443 2014 Maxima NAM

 P1800 VIAS CONTROL SOLENOID VALVE 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check air passage continuity and operation delay time under the
following conditions.

Air passage continuity Air passage continuity

Condition
between (A) and (B) between (A) and (C)
12 V direct current supply be-
Existed Not existed
tween terminals 1 and 2
No supply Not existed Existed
Is the inspection result normal?
YES >> INSPECTION END PBIB2532E

NO >> Replace VIAS control solenoid valve 1. Refer to EM-25,

"Removal and Installation".

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Revision: August 2013 EC-444 2014 Maxima NAM

 P1801 VIAS CONTROL SOLENOID VALVE 2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1801 VIAS CONTROL SOLENOID VALVE 2
A
Description INFOID:0000000010095146

The VIAS control solenoid valve 2 cuts the intake manifold vacuum signal for power valve 2 control. It EC
responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake
manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and sends the vac-
uum signal to the power valve actuator 2.
C
DTC Logic INFOID:0000000010095147

DTC DETECTION LOGIC D

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

An excessively low or high voltage signal

• Harness or connectors E
VIAS control solenoid valve 2 (The solenoid valve 2 circuit is open or
P1801 is sent to ECM via the VIAS control sole-
circuit shorted.)
noid valve 2.
• VIAS control solenoid valve 2
F
DTC CONFIRMATION PROCEDURE
1.CONDITIONING

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G
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON. H
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11 V at idle. I

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE J
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
K
Is 1st trip DTC detected?
YES >> Go to EC-445, "Diagnosis Procedure".
NO >> INSPECTION END
L
Diagnosis Procedure INFOID:0000000010095148

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

M
1.CHECK VIAS CONTROL SOLENOID VALVE 2 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve 2 harness connector. N
3. Turn ignition switch ON.
4. Check the voltage between VIAS control solenoid valve 2 har-
ness connector and ground.
O

VIAS control solenoid valve 2

Ground Voltage
Connector Terminal P
F65 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIB0080E

Revision: August 2013 EC-445 2014 Maxima NAM

 P1801 VIAS CONTROL SOLENOID VALVE 2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK VIAS CONTROL SOLENOID VALVE 2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between VIAS control solenoid valve 2 harness connector and ECM harness con-
nector.

VIAS control solenoid valve 2 ECM

Continuity
Connector Terminal Connector Terminal
F65 2 F14 26 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK VIAS CONTROL SOLENOID VALVE 2
Refer to EC-446, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 4.

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NO >> Replace VIAS control solenoid valve 2.
4.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095149

1.CHECK VIAS CONTROL SOLENOID VALVE 2

With CONSULT
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect vacuum hoses connected to VIAS control solenoid valve 2.
4. Turn ignition switch ON.
5. Select “VIAS S/V-2” in “ACTIVE TEST” mode with CONSULT.
6. Check air passage continuity and operation delay time under the
following conditions.

Condition Air passage continuity Air passage continuity

(VIAS S/V 2) between (A) and (B) between (A) and (C)
ON Existed Not existed
OFF Not existed Existed

JMBIA0180ZZ

Without CONSULT
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve 2 harness connector.
3. Disconnect vacuum hoses connected to VIAS volume control solenoid valve 2.

Revision: August 2013 EC-446 2014 Maxima NAM

 P1801 VIAS CONTROL SOLENOID VALVE 2
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check air passage continuity and operation delay time under the
following conditions. A

Air passage continuity Air passage continuity

Condition
between (A) and (B) between (A) and (C) EC
12 V direct current supply be-
Existed Not existed
tween terminals 1 and 2
No supply Not existed Existed C
Is the inspection result normal?
YES >> INSPECTION END PBIB2532E

NO >> Replace VIAS control solenoid valve 2 D

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Revision: August 2013 EC-447 2014 Maxima NAM

 P1805 BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P1805 BRAKE SWITCH
Description INFOID:0000000010095150

Brake switch signal is applied to the ECM via the stop lamp switch when the brake pedal is depressed. This
signal is used mainly to decrease the engine speed when the vehicle is being driver.
DTC Logic INFOID:0000000010095151

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
A brake switch signal is not sent to ECM for ex- • Harness or connectors
P1805 Brake switch tremely long time while the vehicle is being driv- (Stop lamp switch circuit is open or shorted.)
er. • Stop lamp switch

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.

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3. Erase the DTC.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-448, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095152

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.

Brake pedal Stop lamp

Fully released Not illuminated
Slightly depressed Illuminated
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch harness connector.
2. Check the voltage between stop lamp switch harness connector
and ground.

Stop lamp switch

Ground Voltage
Connector Terminal
E38 3 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
PBIB2102E

3.DETECT MALFUNCTIONING PART

Check the following.

Revision: August 2013 EC-448 2014 Maxima NAM

 P1805 BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Fuse block (J/B) connector E6
• 10 A fuse (No. 7) A
• Harness for open or short between battery and stop lamp switch

>> Repair open circuit, short to ground or short to power in harness or connectors. EC
4.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect stop lamp switch harness connector.
C
2. Disconnect ECM harness connector.
3. Check the continuity between stop lamp switch harness connector and ECM harness connector.

D
Stop lamp switch ECM
Continuity
Connector Terminal Connector Terminal
E38 4 E10 106 Existed E
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6. F
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART

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Check the following.
• Fuse block (J/B) connector E6
• Junction block connectors E44, E45
• Harness for open or short between ECM and stop lamp switch H

>> Repair open circuit, short to ground or short to power in harness or connectors.
I
6.CHECK STOP LAMP SWITCH
Refer to EC-449, "Component Inspection (Stop Lamp Switch)".
Is the inspection result normal? J
YES >> GO TO 7.
NO >> Replace stop lamp switch. Refer to BR-18, "Removal and Installation".
7.CHECK INTERMITTENT INCIDENT K

Refer to GI-41, "Intermittent Incident".

L
>> INSPECTION END
Component Inspection (Stop Lamp Switch) INFOID:0000000010095153
M
1.CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF. N
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals
under the following conditions.
O
Terminals Condition Continuity
Fully released Not existed
3 and 4 Brake pedal P
Slightly depressed Existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
PBIB2103E

2.CHECK STOP LAMP SWITCH-II

Revision: August 2013 EC-449 2014 Maxima NAM
 P1805 BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Adjust stop lamp switch installation. Refer to BR-18, "Removal and Installation".
2. Check harness continuity between stop lamp switch terminals
under the following conditions.

Terminals Condition Continuity

Fully released Not existed
3 and 4 Brake pedal
Slightly depressed Existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp switch. Refer to BR-18, "Removal
and Installation". PBIB2103E

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Revision: August 2013 EC-450 2014 Maxima NAM

 P2096, P2097, P2098, P2099 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2096, P2097, P2098, P2099 A/F SENSOR 1
A
Description INFOID:0000000010095154

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen- EC
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor C
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse via the diffusion layer at the
sensor cell. An electrode layer is applied voltage, and this current D
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
JMBIA0112GB E

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the F
sensor to ensure the required operating temperature of about 800°C
(1,472°F).

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PBIB3354E

DTC Logic INFOID:0000000010095155

I

DTC DETECTION LOGIC

J
Trouble diagnosis name
DTC No. DTC detecting condition Possible Cause
(Trouble diagnosis content)
POST CAT FUEL TRIM SYS K
The output voltage computed by ECM from the A/ • A/F sensor 1 (bank 1)
B1
P2096 F sensor 1 signal is shifts to the lean side for a • A/F sensor 1 heater
(Post catalyst fuel trim system
specified period. • Heated oxygen sensor 2 (bank 1)
too lean bank 1) L
• Fuel pressure
POST CAT FUEL TRIM SYS • Fuel injector
The A/F signal computed by ECM from the A/F
B1 • Intake air leaks
P2097 sensor 1 signal is shifts to the rich side for a spec-
(Post catalyst fuel trim system • Exhaust gas leaks
ified period. M
too rich bank 1)
POST CAT FUEL TRIM SYS
The output voltage computed by ECM from the A/ • A/F sensor 1 (bank 2)
B2
P2098 F sensor 1 signal is shifts to the lean side for a • A/F sensor 1 heater
(Post catalyst fuel trim system
specified period.
N
too lean bank 2) • Heated oxygen sensor 2 (bank 2)
• Fuel pressure
POST CAT FUEL TRIM SYS • Fuel injector
The A/F signal computed by ECM from the A/F
B2 • Intake air leaks
P2099 sensor 1 signal is shifts to the rich side for a spec- O
(Post catalyst fuel trim system • Exhaust gas leaks
ified period.
too rich bank 2)

DTC CONFIRMATION PROCEDURE P

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Revision: August 2013 EC-451 2014 Maxima NAM
 P2096, P2097, P2098, P2099 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.
6. Let engine idle for 1 minute.
7. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
8. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-452, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095156

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

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1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2
Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to EM-31, "Exploded View".

>> GO TO 3.
3.CHECK FOR EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 2.
Is exhaust gas detected?
YES >> Repair or replace.
NO >> GO TO 4.
4.CHECK FOR INTAKE AIR LEAKAGE
1. Start engine and run it at idle.
2. Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES >> GO TO 5.
NO >> Repair or replace malfunctioning part.
5.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-261, "DTC Logic"
or EC-265, "DTC Logic".
NO >> GO TO 6.
6.CHECK HARNESS CONNECTOR
Revision: August 2013 EC-452 2014 Maxima NAM
 P2096, P2097, P2098, P2099 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector. A
3. Check that water is not inside connectors.
Is the inspection result normal?
YES >> GO TO 7. EC
NO >> Repair or replace harness connector.
7.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
C
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and
ground. D

A/F sensor
DTC Ground Voltage (V) E
Bank Connector Terminal
P2096
1 F12 4
P2097
Ground Battery voltage F
P2098
2 F61 4
P2099

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Is the inspection result normal? PBIB3308E
G
YES >> GO TO 9.
NO >> GO TO 8.
8.DETECT MALFUNCTIONING PART H
Check the following.
• IPDM E/R harness connector F10
• 15 A fuse (No. 37) I
• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors. J

9.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. K
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

L
A/F sensor 1 ECM
DTC Continuity
Bank Connector Terminal Connector Terminal

P2096 1 45 M
1 F12
P2097 2 49 Existed
F13
P2098 1 53
2 F61
P2099 2 57 N
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
O
A/F sensor 1
DTC Ground Continuity
Bank Connector Terminal
P
P2096 1
1 F12
P2097 2
Ground Not existed
P2098 1
2 F61
P2099 2

Revision: August 2013 EC-453 2014 Maxima NAM

 P2096, P2097, P2098, P2099 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ECM
DTC Ground Continuity
Connector Terminal

P2096 45
P2097 49
F13 Ground Not existed
P2098 53
P2099 57
5. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK A/F SENSOR 1 HEATER
Refer to EC-172, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 11.
NO >> GO TO 13.
11.CHECK HEATED OXYGEN SENSOR 2

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Refer to EC-235, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 12.
NO >> Replace heated oxygen sensor 2. Refer to EM-31, "Removal and Installation (LH)" (LH) or EM-33,
"Removal and Installation (RH)" (RH).
12.CHECK INTERMITTENT INCIDENT
Perform GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 13.
NO >> Repair or replace malfunctioning part.
13.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-31, "Removal and Installation (LH)" (LH) or
EM-33, "Removal and Installation (RH)" (RH).
CAUTION:
• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
Do you have CONSULT?
YES >> GO TO 14.
NO >> GO TO 15.
14.CONFIRM A/F ADJUSTMENT DATA
With CONSULT
1. Turn ignition switch ON.
2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.
3. Make sure that “0.000” is displayed on CONSULT screen.
Is “0.000” displayed?
YES >> INSPECTION END
NO >> GO TO 15.
15.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
Clear the mixture ratio self-learning value. Refer to EC-24, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
Revision: August 2013 EC-454 2014 Maxima NAM
 P2096, P2097, P2098, P2099 A/F SENSOR 1
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Do you have CONSULT?
YES >> GO TO 16. A
NO >> INSPECTION END
16.CONFIRM A/F ADJUSTMENT DATA
EC
With CONSULT
1. Turn ignition switch ON.
2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.
3. Make sure that “0.000” is displayed on CONSULT screen. C

>> INSPECTION END

D

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Revision: August 2013 EC-455 2014 Maxima NAM

 P2100, P2103 THROTTLE CONTROL MOTOR RELAY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2100, P2103 THROTTLE CONTROL MOTOR RELAY
Description INFOID:0000000010095157

Power supply for the throttle control motor is provided to the ECM via the throttle control motor relay. The throt-
tle control motor relay is controlled ON/OFF by the ECM. When the ignition switch is turned ON, the ECM
sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the igni-
tion switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is
not provided to the ECM.
DTC Logic INFOID:0000000010095158

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
Throttle control motor ECM detects that the voltage of power source (Throttle control motor relay circuit is
P2100
relay circuit open for throttle control motor is excessively low. open.)
• Throttle control motor relay
• Harness or connectors

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Throttle control motor ECM detects that the throttle control motor relay (Throttle control motor relay circuit is
P2103
relay circuit short is stuck ON. shorted.)
• Throttle control motor relay

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V.
Witch DTC is detected?
P2100 >> GO TO 2.
P2103 >> GO TO 3.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P2100
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-456, "Diagnosis Procedure".
NO >> INSPECTION END
3.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P2103
1. Turn ignition switch ON and wait at least 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-456, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095159

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.

Revision: August 2013 EC-456 2014 Maxima NAM

 P2100, P2103 THROTTLE CONTROL MOTOR RELAY
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector. A
4. Check the continuity between IPDM E/R harness connector and ECM harness connector.

IPDM E/R ECM EC

Continuity
Connector Terminal Connector Terminal
F10 70 F14 15 Existed
C
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 2. D
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
1. Check the continuity between IPDM E/R harness connector and ECM harness connector. E

IPDM E/R ECM

Continuity F
Connector Terminal Connector Terminal
F10 54 F14 2 Existed

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2. Also check harness for short to ground and short to power. G
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. H
3.CHECK FUSE
1. Disconnect 15 A fuse (No. 43) from IPDM E/R.
I
2. Check if 15 A fuse is blown.
Is the inspection result normal?
YES >> GO TO 4. J
NO >> Replace 15 A fuse.
4.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". K
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".
NO >> Repair or replace harness or connectors. L

Revision: August 2013 EC-457 2014 Maxima NAM

 P2101 ELECTRIC THROTTLE CONTROL FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2101 ELECTRIC THROTTLE CONTROL FUNCTION
Description INFOID:0000000010095160

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position
sensor provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions
via the throttle control motor.
DTC Logic INFOID:0000000010095161

DTC DETECTION LOGIC

NOTE:
If DTC P2101 is displayed with DTC P2100, first perform the trouble diagnosis for DTC P2100. Refer to
EC-456, "DTC Logic".
If DTC P2101 is displayed with DTC 2119, first perform the trouble diagnosis for DTC P2119. Refer to
EC-465, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

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• Harness or connectors
Electric throttle control Electric throttle control function does not oper- (Throttle control motor circuit is open or
P2101
performance ate properly. shorted.)
• Electric throttle control actuator

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V when
engine is running.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-458, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095162

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
Revision: August 2013 EC-458 2014 Maxima NAM
 P2101 ELECTRIC THROTTLE CONTROL FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Check the voltage between ECM harness connectors.
A
ECM
+ – Condition Voltage
EC
Connector Terminal Connector Terminal
Ignition switch
Approx. 0 V
OFF
F14 2 E10 112 C
Ignition switch
Battery voltage
ON
JMBIA1883ZZ
Is the inspection result normal? D
YES >> GO TO 7.
NO >> GO TO 3.
3.CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II E
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector. F
4. Check the continuity between IPDM E/R harness connector and ECM harness connector.

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IPDM E/R ECM G
Continuity
Connector Terminal Connector Terminal
F10 70 F14 15 Existed
H
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4. I
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
1. Check the continuity between IPDM E/R harness connector and ECM harness connector. J

IPDM E/R ECM

Continuity K
Connector Terminal Connector Terminal
F10 54 F14 2 Existed
2. Also check harness for short to ground and short to power. L
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. M
5.CHECK FUSE
1. Disconnect 15 A fuse (No. 43) from IPDM E/R. N
2. Check if 15 A fuse is blown.
Is the inspection result normal?
YES >> GO TO 6. O
NO >> Replace 15 A fuse.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". P
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".
NO >> Repair or replace harness or connectors.
7.CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.
Revision: August 2013 EC-459 2014 Maxima NAM
 P2101 ELECTRIC THROTTLE CONTROL FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Disconnect ECM harness connector.
4. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

Electric throttle control actuator ECM

Continuity
Connector Terminal Connector Terminal
5 Not existed
5
6 Existed
F57 F14
5 Existed
6
6 Not existed
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace malfunctioning part.
8.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct. Refer to EM-24, "Removal and Installation".
2. Check if foreign matter is caught between the throttle valve (1)

cardiagn.com
and the housing.

2: Electric throttle control actuator

: Vehicle front
Is the inspection result normal?
YES >> GO TO 9.
NO >> Remove the foreign matter and clean the electric throttle
control actuator inside, and then perform throttle valve
closed position learning. Refer to EC-21, "THROTTLE ALBIA0611ZZ
VALVE CLOSED POSITION LEARNING : Special
Repair Requirement".
9.CHECK THROTTLE CONTROL MOTOR
Refer to EC-460, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 11.
10.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 11.
NO >> Repair or replace harness or connectors.
11.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Refer to EC-461, "Special Repair Requirement".

>> INSPECTION END

Component Inspection INFOID:0000000010095163

1.CHECK THROTTLE CONTROL MOTOR

1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.

Revision: August 2013 EC-460 2014 Maxima NAM

 P2101 ELECTRIC THROTTLE CONTROL FUNCTION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check resistance between electric throttle control actuator termi-
nals as per the following. A

Terminals Resistance
5 and 6 Approx. 1 - 15 Ω [at 25°C (77°F)] EC
Is the inspection result normal?
YES >> INSPECTION END
C
NO >> GO TO 2.

PBIB2909E

2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR D

1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Go to EC-461, "Special Repair Requirement".
E

>> INSPECTION END

Special Repair Requirement INFOID:0000000010095164
F

1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

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G
Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2. H
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
I
>> END
J

Revision: August 2013 EC-461 2014 Maxima NAM

 P2118 THROTTLE CONTROL MOTOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2118 THROTTLE CONTROL MOTOR
Description INFOID:0000000010095165

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position
sensor it provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions
via the throttle control motor.
DTC Logic INFOID:0000000010095166

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connectors
Throttle control motor ECM detects short in both circuits between (Throttle control motor circuit is shorted.)
P2118
circuit short ECM and throttle control motor. • Electric throttle control actuator
(Throttle control motor)

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

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If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-462, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095167

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect electric throttle control actuator harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

Revision: August 2013 EC-462 2014 Maxima NAM

 P2118 THROTTLE CONTROL MOTOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

Electric throttle control actuator ECM A

Continuity
Connector Terminal Connector Terminal
5 Not existed
5 EC
6 Existed
F57 F14
5 Existed
6
6 Not existed C
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
D
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part.
3.CHECK THROTTLE CONTROL MOTOR E
Refer to EC-463, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 4. F
NO >> GO TO 5.
4.CHECK INTERMITTENT INCIDENT

cardiagn.com
G
Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 5. H
NO >> Repair or replace harness or connectors.
5.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation". I
2. Go to EC-464, "Special Repair Requirement".

>> INSPECTION END J

Component Inspection INFOID:0000000010095168

K
1.CHECK THROTTLE CONTROL MOTOR
1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector. L
3. Check resistance between electric throttle control actuator termi-
nals as per the following.
M
Terminals Resistance
5 and 6 Approx. 1 - 15 Ω [at 25°C (77°F)]
Is the inspection result normal? N
YES >> INSPECTION END
NO >> GO TO 2.
O
PBIB2909E

2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation". P
2. Go to EC-461, "Special Repair Requirement".

>> INSPECTION END

Revision: August 2013 EC-463 2014 Maxima NAM

 P2118 THROTTLE CONTROL MOTOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Special Repair Requirement INFOID:0000000010095169

1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

cardiagn.com

Revision: August 2013 EC-464 2014 Maxima NAM

 P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
A
Description INFOID:0000000010095170

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. EC
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throt-
tle valve and sends the voltage signals to the ECM. The ECM judges the current opening angle of the throttle
valve from these signals and opens/closes the throttle valve in response to driving conditions via the throttle C
control motor.
DTC Logic INFOID:0000000010095171
D

DTC DETECTION LOGIC

E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Electric throttle control actuator does not function
A)
properly due to the return spring malfunction.
F
Electric throttle control
P2119 Throttle valve opening angle in fail-safe mode is • Electric throttle control actuator
actuator B)
not in specified range.

cardiagn.com
C) ECM detects that the throttle valve is stuck open. G
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING H
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. I
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
J
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A AND B
1. Turn ignition switch ON and wait at least 1 second. K
2. Selector lever position is D and wait at least 3 seconds.
3. Selector lever position is P.
4. Turn ignition switch OFF and wait at least 10 seconds. L
5. Turn ignition switch ON and wait at least 1 second.
6. Selector lever position is D and wait at least 3 seconds.
7. Selector lever position is P.
8. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON. M
9. Check DTC.
Is DTC detected?
N
YES >> Go to EC-466, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C O
1. Turn ignition switch ON and wait at least 1 second.
2. Selector lever position is D and wait at least 3 seconds.
3. Selector lever position is N or P.
P
4. Start engine and let it idle for 3 seconds.
5. Check DTC.
Is DTC detected?
YES >> Go to EC-466, "Diagnosis Procedure".
NO >> INSPECTION END

Revision: August 2013 EC-465 2014 Maxima NAM

 P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010095172

1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.
2. Remove the intake air duct. Refer to EM-24, "Removal and Installation".
3. Check if foreign matter is caught between the throttle valve (1)
and the housing.

2: Electric throttle control actuator

: Vehicle front
Is the inspection result normal?
YES >> GO TO 2.
NO >> Remove the foreign matter and clean the electric throttle
control actuator inside, and then perform throttle valve
closed position learning. Refer to EC-21, "THROTTLE ALBIA0611ZZ
VALVE CLOSED POSITION LEARNING : Special
Repair Requirement".
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".

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2. Go to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

>> INSPECTION END

Special Repair Requirement INFOID:0000000010095173

1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

Revision: August 2013 EC-466 2014 Maxima NAM

 P2122, P2123 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2122, P2123 APP SENSOR
A
Description INFOID:0000000010095174

The accelerator pedal position sensor is installed on the upper end EC

of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometer which transform the accelerator pedal C
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors sends opening and closing speed of the
accelerator pedal and feed the voltage signals to the ECM. The ECM D
judges the current opening angle of the accelerator pedal from these
signals and controls the throttle control motor based on these sig-
nals.
Idle position of the accelerator pedal is determined by the ECM
PBIB1741E E
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for engine opera-
tions such as fuel cut.
F
DTC Logic INFOID:0000000010095175

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DTC DETECTION LOGIC
G
NOTE:
If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to EC-394, "DTC Logic".
H
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Accelerator pedal posi-
An excessively low voltage from the APP sen- I
P2122 tion sensor 1 circuit low • Harness or connectors
sor 1 is sent to ECM.
input [Accelerator pedal position (APP) sensor
Accelerator pedal posi- 1 circuit is open or shorted.]
An excessively high voltage from the APP sen- • APP sensor 1
P2123 tion sensor 1 circuit high J
sor 1 is sent to ECM.
input

DTC CONFIRMATION PROCEDURE

K
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. L
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. M
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

N
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second. O
2. Check DTC.
Is DTC detected?
YES >> Go to EC-467, "Diagnosis Procedure". P
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095176

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
Revision: August 2013 EC-467 2014 Maxima NAM
 P2122, P2123 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and
ground.

APP sensor
Ground Voltage (V)
Connector Terminal
E40 5 Ground Approx. 5
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIA9607J

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3.CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sensor harness connector and ECM harness connector.

APP sensor ECM

Continuity
Connector Terminal Connector Terminal
E40 4 E10 84 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sensor harness connector and ECM harness connector.

APP sensor ECM

Continuity
Connector Terminal Connector Terminal
E40 3 E10 81 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK APP SENSOR
Refer to EC-469, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Refer to EC-469, "Special Repair Requirement".

Revision: August 2013 EC-468 2014 Maxima NAM

 P2122, P2123 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> INSPECTION END
7.CHECK INTERMITTENT INCIDENT A

Refer to GI-41, "Intermittent Incident".

EC
>> INSPECTION END
Component Inspection INFOID:0000000010095177
C
1.CHECK ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
D
2. Turn ignition switch ON.
3. Check the voltage between ECM harness connector terminals
under the following conditions.
E
ECM
+ – Condition Voltage (V)
Connector F
Terminal Terminal
81 Fully released 0.5 - 1.0
84

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(APP
sensor 1
(Sensor Fully de- G
ground) 4.2 - 4.8
signal) pressed
Accelerator JMBIA1884ZZ
E10
82 pedal Fully released 0.25 - 0.5
100 H
(APP
(Sensor Fully de-
sensor 2 2.0 - 2.5
ground) pressed
signal)
Is the inspection result normal? I
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ACCELERATOR PEDAL ASSEMBLY J

1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".

2. Go to EC-469, "Special Repair Requirement".
K

>> INSPECTION END

Special Repair Requirement INFOID:0000000010095178 L

1.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Refer to EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement". M

>> GO TO 2.
N
2.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
O
>> GO TO 3.
3.PERFORM IDLE AIR VOLUME LEARNING P
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement".

>> END

Revision: August 2013 EC-469 2014 Maxima NAM

 P2127, P2128 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2127, P2128 APP SENSOR
Description INFOID:0000000010095179

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometer which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors sends opening and closing speed of the
accelerator pedal and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the accelerator pedal from these
signals and controls the throttle control motor based on these sig-
nals.
Idle position of the accelerator pedal is determined by the ECM
PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for engine opera-
tions such as fuel cut.
DTC Logic INFOID:0000000010095180

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DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Accelerator pedal posi- • Harness or connectors
An excessively low voltage from the APP sen-
P2127 tion sensor 2 circuit low [Accelerator pedal position (APP) sensor
sor 2 is sent to ECM.
input 2 circuit is open or shorted.]
[Crankshaft position (CKP) sensor (POS)
circuit is shorted.]
(EVAP control system pressure sensor
circuit is shorted.)
Accelerator pedal posi- (Refrigerant pressure sensor circuit is
An excessively high voltage from the APP sen-
P2128 tion sensor 2 circuit high shorted.)
sor 2 is sent to ECM.
input • APP sensor 2
• CKP sensor (POS)
• EVAP control system pressure sensor
• Refrigerant pressure sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-470, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095181

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

Revision: August 2013 EC-470 2014 Maxima NAM
 P2127, P2128 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

1.CHECK GROUND CONNECTION A

1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal? EC
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I C
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and D
ground.

APP sensor E
Ground Voltage (V)
Connector Terminal
E40 6 Ground Approx. 5
F
Is the inspection result normal?
YES >> GO TO 6.

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NO >> GO TO 3.
JMBIA1609ZZ G
3.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. H
2. Disconnect ECM harness connector.
3. Check the continuity between APP sensor harness connector and ECM harness connector.

I
APP sensor ECM
Continuity
Connector Terminal Connector Terminal
E40 6 E10 87 Existed J
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit. K
4.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals. L

ECM Sensor
Connector Terminal Name Connector Terminal M
72 Refrigerant pressure sensor E219 1
F13
76 CKP sensor (POS) F30 1
N
87 APP sensor E40 6
E10
91 EVAP control system pressure sensor B41 3
Is the inspection result normal? O
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors.
5.CHECK COMPONENTS P

Check the following.

• Crankshaft position sensor (POS) (Refer to EC-299, "Component Inspection".)
• EVAP control system pressure sensor (Refer to EC-346, "Component Inspection".)
• Refrigerant pressure sensor (Refer to EC-515, "Diagnosis Procedure".)
Is the inspection result normal?
YES >> GO TO 10.

Revision: August 2013 EC-471 2014 Maxima NAM

 P2127, P2128 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Replace malfunctioning components.
6.CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sensor harness connector and ECM harness connector.

APP sensor ECM

Continuity
Connector Terminal Connector Terminal
E40 2 E10 100 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sensor harness connector and ECM harness connector.

APP sensor ECM

cardiagn.com
Continuity
Connector Terminal Connector Terminal
E40 1 E10 82 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR
Refer to EC-472, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Refer to EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment"

>> INSPECTION END

10.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095182

1.CHECK ACCELERATOR PEDAL POSITION SENSOR

1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.

Revision: August 2013 EC-472 2014 Maxima NAM

 P2127, P2128 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between ECM harness connector terminals
under the following conditions. A

ECM
+ – Condition Voltage (V) EC
Connector
Terminal Terminal
81 Fully released 0.5 - 1.0
(APP
84 C
(Sensor Fully de-
sensor 1 4.2 - 4.8
ground) pressed
signal) Accelerator JMBIA1884ZZ
E10
82 pedal Fully released 0.25 - 0.5 D
100
(APP
(Sensor Fully de-
sensor 2 2.0 - 2.5
ground) pressed
signal)
E
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2. F
2.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".

cardiagn.com
2. Go to EC-469, "Special Repair Requirement". G

>> INSPECTION END

H
Special Repair Requirement INFOID:0000000010095183

1.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING I

Refer to EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement".

>> GO TO 2. J

2.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement". K

>> GO TO 3.
3.PERFORM IDLE AIR VOLUME LEARNING L

Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement".

M
>> END

Revision: August 2013 EC-473 2014 Maxima NAM

 P2135 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2135 TP SENSOR
Description INFOID:0000000010095184

Electric throttle control actuator consists of throttle control motor,

throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometers which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. In addition,
these sensors detect the opening and closing speed of the throttle
valve and feed the voltage signals to the ECM. The ECM judges the
current opening angle of the throttle valve from these signals and the
ECM controls the throttle control motor to make the throttle valve
opening angle properly in response to driving condition.
PBIB0145E

DTC Logic INFOID:0000000010095185

DTC DETECTION LOGIC

NOTE:
If DTC P2135 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

cardiagn.com
EC-394, "DTC Logic".

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connector
Throttle position sensor Rationally incorrect voltage is sent to ECM [Throttle position (TP) sensor 1 or 2 circuit
P2135 circuit range/perfor- compared with the signals from Throttle posi- is open or shorted.]
mance tion sensor 1 and Throttle position sensor 2. • Electric throttle control actuator
(TP sensor 1 or 2)

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-474, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095186

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.

Revision: August 2013 EC-474 2014 Maxima NAM

 P2135 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
NO >> Repair or replace ground connection.
2.CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-I A

1. Disconnect electric throttle control actuator harness connector.

2. Turn ignition switch ON.
EC
3. Check the voltage between electric throttle control actuator har-
ness connector and ground.

Electric throttle control actuator

C
Ground Voltage (V)
Connector Terminal
F57 1 Ground Approx. 5 D
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in E
harness or connectors. PBIB3484E

3.CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
F
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-

cardiagn.com
nector. G

Electric throttle control actuator ECM

Continuity H
Connector Terminal Connector Terminal
F57 4 F13 36 Existed
4. Also check harness for short to ground and short to power. I
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. J
4.CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector. K

Electric throttle control actuator ECM

Continuity L
Connector Terminal Connector Terminal
2 37
F57 F13 Existed
3 38 M
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
N
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK THROTTLE POSITION SENSOR O
Refer to EC-476, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7. P
NO >> GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Refer to EC-476, "Special Repair Requirement"

>> INSPECTION END

Revision: August 2013 EC-475 2014 Maxima NAM

 P2135 TP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

7.CHECK INTERMITTENT INCIDENT

Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095187

1.CHECK THROTTLE POSITION SENSOR

1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Perform EC-476, "Special Repair Requirement".
4. Turn ignition switch ON.
5. Set selector lever to D position.
6. Check the voltage between ECM harness connector terminals
under the following conditions.

ECM
+ – Condition Voltage
Connector

cardiagn.com
Terminal Terminal
Fully re-
37 More than 0.36 V
leased
(TP sensor
1 signal) Fully de-
36 Less than 4.75 V
Accelerator pressed JMBIA1864ZZ
F13 (Sensor
pedal Fully re-
ground) Less than 4.75 V
38 leased
(TP sensor
2 signal) Fully de-
More than 0.36 V
pressed
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-25, "Removal and Installation".
2. Go to EC-476, "Special Repair Requirement".

>> INSPECTION END

Special Repair Requirement INFOID:0000000010095188

1.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

Revision: August 2013 EC-476 2014 Maxima NAM

 P2138 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
P2138 APP SENSOR
A
Description INFOID:0000000010095189

The accelerator pedal position sensor is installed on the upper end EC

of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometer which transform the accelerator pedal C
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors sends opening and closing speed of the
accelerator pedal and feed the voltage signals to the ECM. The ECM D
judges the current opening angle of the accelerator pedal from these
signals and controls the throttle control motor based on these sig-
nals.
Idle position of the accelerator pedal is determined by the ECM
PBIB1741E E
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for engine opera-
tions such as fuel cut.
F
DTC Logic INFOID:0000000010095190

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DTC DETECTION LOGIC
G
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-394, "DTC Logic".
H
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
• Harness or connector
[Accelerator pedal position (APP) sensor I
1 or 2 circuit is open or shorted.]
[Crankshaft position (CKP) sensor (POS)
circuit is shorted.]
J
Accelerator pedal posi- Rationally incorrect voltage is sent to ECM (Refrigerant pressure sensor circuit is
P2138 tion sensor circuit range/ compared with the signals from APP sensor 1 shorted.)
performance and APP sensor 2. (EVAP control system pressure sensor
circuit is shorted.) K
• APP sensor 1 or 2
• CKP sensor (POS)
• EVAP control system pressure sensor
• Refrigerant pressure sensor L

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING M
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds. N
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION: O
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2. P
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-478, "Diagnosis Procedure".
NO >> INSPECTION END

Revision: August 2013 EC-477 2014 Maxima NAM

 P2138 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Diagnosis Procedure INFOID:0000000010095191

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK SENSOR POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and
ground.

APP sensor
Ground Voltage (V)
Connector Terminal
E40 5 Ground Approx. 5

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Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in
harness or connectors. PBIA9607J

3.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

1. Turn ignition switch ON.
2. Check the voltage between APP sensor harness connector and
ground.

APP sensor
Ground Voltage (V)
Connector Terminal
E40 6 Ground Approx. 5
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 4.
JMBIA1609ZZ

4.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sensor harness connector and ECM harness connector.

APP sensor ECM

Continuity
Connector Terminal Connector Terminal
E40 6 E10 87 Existed
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit.
5.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.

Revision: August 2013 EC-478 2014 Maxima NAM

 P2138 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

ECM Sensor A
Connector Terminal Name Connector Terminal
72 Refrigerant pressure sensor E219 1
F13 EC
76 CKP sensor (POS) F30 1
87 APP sensor E40 6
E10
91 EVAP control system pressure sensor B41 3 C
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair short to ground or short to power in harness or connectors. D
6.CHECK COMPONENTS
Check the following. E
• Crankshaft position sensor (POS) (Refer to EC-299, "Component Inspection".)
• EVAP control system pressure sensor (Refer to EC-346, "Component Inspection".)
• Refrigerant pressure sensor (Refer to EC-515, "Diagnosis Procedure".)
F
Is the inspection result normal?
YES >> GO TO 11.

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NO >> Replace malfunctioning components.
G
7.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. H
3. Check the continuity between APP sensor harness connector and ECM harness connector.

APP sensor ECM I

Continuity
Connector Terminal Connector Terminal
4 84
E40 E10 Existed J
2 100
4. Also check harness for short to ground and short to power.
Is the inspection result normal? K
YES >> GO TO 8.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT L
1. Check the continuity between APP sensor harness connector and ECM harness connector.

M
APP sensor ECM
Continuity
Connector Terminal Connector Terminal
3 81 N
E40 E10 Existed
1 82
2. Also check harness for short to ground and short to power.
O
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
P
9.CHECK APP SENSOR
Refer to EC-472, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 11.
NO >> GO TO 10.
10.REPLACE ACCELERATOR PEDAL ASSEMBLY
Revision: August 2013 EC-479 2014 Maxima NAM
 P2138 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Refer to EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".

>> INSPECTION END

11.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection INFOID:0000000010095192

1.CHECK ACCELERATOR PEDAL POSITION SENSOR

1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check the voltage between ECM harness connector terminals
under the following conditions.

ECM

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+ – Condition Voltage (V)
Connector
Terminal Terminal
81 Fully released 0.5 - 1.0
84
(APP
(Sensor Fully de-
sensor 1 4.2 - 4.8
ground) pressed
signal) Accelerator JMBIA1884ZZ
E10
82 pedal Fully released 0.25 - 0.5
100
(APP
(Sensor Fully de-
sensor 2 2.0 - 2.5
ground) pressed
signal)
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".
2. Go to EC-469, "Special Repair Requirement".

>> INSPECTION END

Special Repair Requirement INFOID:0000000010095193

1.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Refer to EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement".

>> GO TO 2.
2.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Refer to EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".

>> GO TO 3.
3.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement".

Revision: August 2013 EC-480 2014 Maxima NAM

 P2138 APP SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> END
A

EC

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G

Revision: August 2013 EC-481 2014 Maxima NAM

 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
ASCD BRAKE SWITCH
Description INFOID:0000000010095194

When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
Refer to EC-68, "System Diagram" for the ASCD function.
Component Function Check INFOID:0000000010095195

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK ASCD BRAKE SWITCH FUNCTION
With CONSULT
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.
3. Check “BRAKE SW1” indication under the following conditions.

Monitor item Condition Indication

Slightly depressed OFF
BRAKE SW1 Brake pedal

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Fully released ON

Without CONSULT
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connectors.

ECM
+ – Condition Voltage
Connector
Terminal Terminal
Slightly
110 Approx. 0 V
Brake depressed
E10 (ASCD brake 112
pedal Fully re-
switch signal) Battery voltage
leased
JMBIA1881ZZ
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-482, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095196

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD brake switch harness con-
nector and ground.

ASCD brake switch

Ground Voltage
Connector Terminal
E37 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
PBIB0857E

2.DETECT MALFUNCTIONING PART

Revision: August 2013 EC-482 2014 Maxima NAM
 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check the following.
• Fuse block (J/B) connector E6 A
• Junction block connectors E44, E46
• 10 A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse
EC

>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT C
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ASCD brake switch harness connector and ECM harness connector. D

ASCD brake switch ECM

Continuity E
Connector Terminal Connector Terminal
E37 2 E10 110 Existed
4. Also check harness for short to ground and short to power. F
Is the inspection result normal?
YES >> GO TO 5.

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NO >> GO TO 4. G
4.DETECT MALFUNCTIONING PART
Check the following.
• Junction block connectors E45, E46 H
• Harness for open or short between ASCD brake switch and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors. I

5.CHECK ASCD BRAKE SWITCH

Refer to EC-483, "Component Inspection (ASCD Brake Switch)". J
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace ASCD brake switch. Refer to BR-18, "Removal and Installation". K
6.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". L

>> INSPECTION END

Component Inspection (ASCD Brake Switch) INFOID:0000000010095197
M

1.CHECK ASCD BRAKE SWITCH-I

N
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check the continuity between ASCD brake switch terminals
under the following conditions. O

Terminals Condition Continuity

Fully released. Existed
P
1 and 2 Brake pedal
Slightly depressed. Not existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
SEC023D

Revision: August 2013 EC-483 2014 Maxima NAM

 ASCD BRAKE SWITCH
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

2.CHECK ASCD BRAKE SWITCH-II

1. Adjust ASCD brake switch installation. Refer to BR-14, "Inspection and Adjustment".
2. Check the continuity between ASCD brake switch terminals
under the following conditions.

Terminals Condition Continuity

Fully released. Existed
1 and 2 Brake pedal
Slightly depressed. Not existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace ASCD brake switch. Refer to BR-18, "Removal
and Installation". SEC023D

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Revision: August 2013 EC-484 2014 Maxima NAM

 ASCD INDICATOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
ASCD INDICATOR
A
Description INFOID:0000000010095198

ASCD indicator lamp illuminates to indicate ASCD operation status. CRUISE is integrated in combination EC
meter.
CRUISE illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD system
is ready for operation.
Refer to EC-68, "System Diagram" for the ASCD function. C

Component Function Check INFOID:0000000010095199

1.CHECK ASCD INDICATOR FUNCTION D

Check ASCD indicator under the following conditions.

E
ASCD INDICATOR CONDITION SPECIFICATION
• MAIN switch: Pressed at the
CRUISE • Ignition switch: ON 1st time → ON → OFF
F
at the 2nd time
Is the inspection result normal?

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YES >> INSPECTION END G
NO >> Go to EC-485, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095200

H
1.CHECK DTC
Check that DTC UXXXX is not displayed.
I
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform trouble diagnosis for DTC UXXXX. Refer to EC-161, "Diagnosis Procedure".
J
2.CHECK COMBINATION METER FUNCTION
Refer to MWI-29, "CONSULT Function (METER/M&A)".
Is the inspection result normal? K
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part.
3.CHECK INTERMITTENT INCIDENT L

Refer to GI-41, "Intermittent Incident".

Is the inspection result normal? M
YES >> Replace combination meter. Refer to MWI-122, "Removal and Installation".
NO >> Repair or replace malfunctioning part.
N

Revision: August 2013 EC-485 2014 Maxima NAM

 COOLING FAN
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
COOLING FAN
Description INFOID:0000000010095201

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].
COOLING FAN MOTOR
The cooling fan operates at each speed when the current flows in the cooling fan motor as per the following.

Cooling fan motor terminals

Cooling fan speed
(+) (–)
1 3 and 4
2 3 and 4
Middle (MID)
1 and 2 3
1 and 2 4
High (HI) 1 and 2 3 and 4
The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series under
the middle speed condition.

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Refer to EC-77, "System Diagram".
Component Function Check INFOID:0000000010095202

1.CHECK COOLING FAN FUNCTION

With CONSULT
1. Turn ignition switch ON.
2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT.
3. Check that cooling fan speed varies according to the percentage.
Without CONSULT
1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to PCS-11, "Diagnosis
Description".
2. Check that cooling fan operates.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-486, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095203

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect cooling fan relays-2, -3.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan relays-2, -3 harness con-
nectors and ground.

Cooling fan relay

Ground Voltage
Connector Terminal

E42 2
(cooling fan relay-2) 5
Ground Battery voltage
E43 2
(cooling fan relay-3) 5 PBIB0071E

Is the inspection result normal?

Revision: August 2013 EC-486 2014 Maxima NAM

 COOLING FAN
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 3.
NO >> GO TO 2. A
2.DETECT MALFUNCTIONING PART
Check the following.
EC
• 10 A fuse (No. 33)
• 40 A fusible link (letter K)
• Joint connector-E01 E1
• IPDM E/R harness connector E18 C
• Junction block connectors E44, E48
• Harness for open or short between cooling fan relay-2 and battery
• Harness for open or short between cooling fan relay-3 and battery
D
• Harness for open or short between cooling fan relay-2 and IPDM E/R
• Harness for open or short between cooling fan relay-3 and IPDM E/R

E
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF. F
2. Disconnect IPDM E/R harness connectors.
3. Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connec-

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tor. G

Cooling fan relay IPDM E/R

Continuity
Connector Terminal Connector Terminal H
E42
1 E17 42
(cooling fan relay-2)
Existed
E43 I
1 E18 34
(cooling fan relay-3)
4. Also check harness for short to ground and short to power.
Is the inspection result normal? J
YES >> GO TO 5.
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART K

Check the following.

• Harness for open or short between cooling fan relay-2 and IPDM E/R L
• Harness for open or short between cooling fan relay-3 and IPDM E/R

>> Repair open circuit, short to ground or short to power in harness or connectors. M
5.CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT
1. Disconnect cooling fan motor-1 harness connector.
2. Check the voltage between cooling fan motor-1 harness con- N
nector and ground.

Cooling fan motor-1 O

Ground Voltage
Connector Terminal
1
E220 Ground Battery voltage P
2
Is the inspection result normal?
YES >> GO TO 7. PBIB1670E
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
Revision: August 2013 EC-487 2014 Maxima NAM
 COOLING FAN
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• 40 A fusible link (letter M)
• Harness connector E12, E203
• Harness for open or short between cooling fan motor-1 and battery

>> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK COOLING FAN MOTOR CIRCUIT-I
1. Disconnect cooling fan motor-2 harness connector.
2. Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 har-
ness connectors.

Cooling fan relay Cooling fan motor

Continuity
Connector Terminal Connector Terminal
E221
3 2
E42 (Cooling fan motor-2)
(cooling fan relay-2) E220
7 3
(Cooling fan motor-1)
Existed
E221
3 1
E43 (Cooling fan motor-2)

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(cooling fan relay-3) E220
7 4
(Cooling fan motor-1)
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
• Joint connector-E02 E20
• Harness connector E12, E203
• Harness for open or short between cooling fan motor-1 and cooling fan relay-2
• Harness for open or short between cooling fan motor-1 and cooling fan relay-3
• Harness for open or short between cooling fan motor-2 and cooling fan relay-2
• Harness for open or short between cooling fan motor-2 and cooling fan relay-3

>> Repair open circuit, short to ground or short to power in harness or connectors.
9.CHECK COOLING FAN MOTOR CIRCUIT-II
1. Check the continuity between IPDM E/R harness connector and cooling fan motor-1, -2 harness connec-
tor.

IPDM E/R Cooling fan motor

Continuity
Connector Terminal Connector Terminal
E220
35 4
(Cooling fan motor-1)
E18 Existed
E221
38 1
(Cooling fan motor-2)
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 11.
NO >> GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
• Joint connector-E02 E20

Revision: August 2013 EC-488 2014 Maxima NAM

 COOLING FAN
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
• Harness connector E70, E305
• Harness for open or short between cooling fan motor-1 and IPDM E/R A
• Harness for open or short between cooling fan motor-2 and IPDM E/R

>> Repair open circuit, short to ground or short to power in harness or connectors. EC
11.CHECK COOLING FAN MOTOR CIRCUIT-III
1. Check the continuity between cooling fan relay-2, -3 harness connectors and ground.
C

Cooling fan motor

Ground Continuity
Connector Terminal D
E42
6
(cooling fan relay-2)
Ground Existed
E43 E
6
(cooling fan relay-3)
2. Also check harness for short to ground and short to power.
Is the inspection result normal? F
YES >> GO TO 12.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.

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12.CHECK COOLING FAN MOTOR CIRCUIT-IV G

1. Check the continuity between cooling fan motor-2 harness connector and ground.
H
Cooling fan motor-2
Ground Continuity
Connector Terminal
3 I
E221 Ground Existed
4
2. Also check harness for short to ground and short to power. J
Is the inspection result normal?
YES >> GO TO 13.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. K
13.CHECK COOLING FAN RELAYS-2 AND -3
Refer to EC-490, "Component Inspection (Cooling Fan Relay)".
L
Is the inspection result normal?
YES >> GO TO 14.
NO >> Replace malfunctioning cooling fan relay.
M
14.CHECK COOLING FAN MOTORS-1 AND -2
Refer to EC-489, "Component Inspection (Cooling Fan Motor)".
Is the inspection result normal? N
YES >> GO TO 15.
NO >> Replace malfunctioning cooling fan motor. Refer to CO-16, "Removal and Installation".
15.CHECK INTERMITTENT INCIDENT O

Perform GI-41, "Intermittent Incident".

Is the inspection result normal? P
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".
NO >> Repair or replace harness connectors.
Component Inspection (Cooling Fan Motor) INFOID:0000000010095204

1.CHECK COOLING FAN MOTOR

1. Turn ignition switch OFF.

Revision: August 2013 EC-489 2014 Maxima NAM

 COOLING FAN
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Disconnect cooling fan motor harness connector.
3. Supply cooling fan motor terminals with battery voltage and
check operation.

Terminals
Condition
+ −
1 3 and 4
2 3 and 4
A
Cooling fan motor 1 and 2 3
1 and 2 4 SEF734W

B 1, 2 3, 4
Check that cooling fan speed of condition B is higher than that of A.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace cooling fan motor. Refer to CO-16, "Removal and Installation".
Component Inspection (Cooling Fan Relay) INFOID:0000000010095205

1.CHECK COOLING FAN RELAY

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1. Disconnect cooling fan relays -2, -3 harness connectors.
2. Check continuity between cooling fan relay -2, -3 terminals
under the following conditions.

Terminals Conditions Continuity

3 and 5 12 V direct current supply between terminals 1 and 2 Existed

6 and 7 No current supply Not existed
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace cooling fan relay.
SEF745U

Revision: August 2013 EC-490 2014 Maxima NAM

 ELECTRICAL LOAD SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
ELECTRICAL LOAD SIGNAL
A
Description INFOID:0000000010095206

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred via EC
the CAN communication line from BCM to ECM via the IPDM E/R.
Component Function Check INFOID:0000000010095207

C
1.CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION
1. Turn ignition switch ON.
2. Connect CONSULT and select “DATA MONITOR” mode. D
3. Select “LOAD SIGNAL” and check indication under the following conditions.

Monitor item Condition Indication E

ON ON
LOAD SIGNAL Rear window defogger switch
OFF OFF
F
Is the inspection result normal?
YES >> GO TO 2.

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NO >> Go to EC-491, "Diagnosis Procedure". G
2.CHECK LIGHTING SWITCH FUNCTION
Check “LOAD SIGNAL” indication under the following conditions.
H
Monitor item Condition Indication
ON at 2nd position ON
LOAD SIGNAL Lighting switch I
OFF OFF
Is the inspection result normal?
YES >> GO TO 3. J
NO >> Go to EC-491, "Diagnosis Procedure".
3.CHECK HEATER FAN CONTROL SWITCH FUNCTION
K
Select “HEATER FAN SW” and check indication under the following conditions.

Monitor item Condition Indication L

ON ON
HEATER FAN SW Heater fan control switch
OFF OFF
Is the inspection result normal? M
YES >> INSPECTION END
NO >> Go to EC-491, "Diagnosis Procedure".
N
Diagnosis Procedure INFOID:0000000010095208

1.INSPECTION START O
Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to EC-491, "Compo-
nent Function Check".
Which circuit is related to the incident? P
Rear window defogger>>GO TO 2.
Headlamp>>GO TO 3.
Heater fan>>GO TO 4.
2.CHECK REAR WINDOW DEFOGGER SYSTEM
Refer to DEF-3, "Work Flow".

Revision: August 2013 EC-491 2014 Maxima NAM

 ELECTRICAL LOAD SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
>> INSPECTION END
3.CHECK HEADLAMP SYSTEM
Refer to EXL-6, "Work Flow" (XENON TYPE) or EXL-171, "Work Flow" (HALOGEN TYPE).

>> INSPECTION END

4.CHECK HEATER FAN CONTROL SYSTEM
Refer to HA-17, "WITH COLOR DISPLAY : How to Perform Trouble Diagnosis For Quick And Accurate
Repair" (with color display) or HA-17, "WITH MONOCHROME DISPLAY : How to Perform Trouble Diagnosis
For Quick And Accurate Repair" (with monochrome display).

>> INSPECTION END

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Revision: August 2013 EC-492 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
ELECTRONIC CONTROLLED ENGINE MOUNT
A
Description INFOID:0000000010095209

In the idle range, ECM turns OFF the electronically-controlled engine mount control solenoid valve and applies EC
manifold pressure to the electronically controlled engine mount. This decreases damping force of the electron-
ically-controlled engine mount and absorbs vibrations traveling from the engine to the body for improving the
quietness.
In the driving range, ECM turns ON the electronically-controlled engine mount control solenoid valve and cuts C
manifold pressure applied on the electronically-controlled engine mount. This increases damping force of the
electronically-controlled engine mount and reduces vibrations generated during driving.
D
Component Function Check INFOID:0000000010095210

1.CHECK OVERALL FUNCTION

E
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select “ENGINE MOUNTING” in “ACTIVE TEST” mode with CONSULT and touch “ON/OFF” on the CON-
SULT screen. F
3. Check that the motor operating sound is heard from front electronic controlled engine mount and rear
electronic controlled engine mount for about 0.5 seconds according to the switching condition of “ENGINE

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MOUNTING”. G

Without CONSULT
1. Make sure that gear position is P or N. H
2. Start engine and let it idle.
3. Change the engine speed from idle to more than 1,000 rpm and then return to idle (with vehicle stopped).
4. Check that the motor operating sound is heard from front electronic controlled engine mount for and rear
I
electronic controlled engine mount about 0.5 seconds when changing engine speed.
It is better to hear the operating sound around the left side front wheel house.
OK or NG
J
YES >> INSPECTION END
NO >> EC-493, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095211 K

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK VACUUM SOURCE L
1. Turn ignition switch OFF.
2. Reconnect electronic controlled engine mount control solenoid valve harness connector.
3. Disconnect vacuum hose connected to electronic controlled engine mount. M
4. Start engine and let it idle.
5. Check vacuum hose for vacuum existence.
N
Vacuum should exist.
Is the inspection result normal?
YES >> GO TO 7. O
NO >> GO TO 2.
2.CHECK VACUUM HOSES AND VACUUM GALLERY
1. Turn ignition switch OFF. P
2. Check vacuum hoses and vacuum gallery for clogging, cracks or improper connection. Refer to EC-85,
"System Description".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace vacuum hoses and vacuum gallery.
3.CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE POWER SUPPLY
Revision: August 2013 EC-493 2014 Maxima NAM
 ELECTRONIC CONTROLLED ENGINE MOUNT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
CIRCUIT
1. Disconnect electronic controlled engine mount control solenoid valve harness connector.
2. Turn ignition switch ON.
3. Check the voltage between front electronic controlled engine
mount harness connector and ground.

Electronic controlled engine mount

control solenoid valve Ground Voltage
Connector Terminal
F64 1 Ground Battery voltage
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4. SEF206W

4.DETECT MALFUNCTIONING PART

Check the following.
• 10 A fuse (No. 3)
• Fuse block (J/B) E6
• Harness connectors E3, F1
• Junction connectors E44, E46

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• Harness for open or short between electronic controlled engine mount control solenoid valve and fuse

>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE OUTPUT SIG-
NAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between ECM harness connector and electronic controlled engine mount control
solenoid valve harness connector.

Electronic controlled engine

ECM
mount control solenoid valve Continuity
Connector Terminal Connector Terminal
F14 28 F64 2 Existed
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit, short to ground or short to power in harness connectors.
6.CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE
Refer to EC-495, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace electronic controlled engine mount control solenoid valve. Refer to EC-85, "System
Description".
7.CHECK ELECTRONIC CONTROLLED ENGINE MOUNT
1. Turn ignition switch OFF.

Revision: August 2013 EC-494 2014 Maxima NAM

 ELECTRONIC CONTROLLED ENGINE MOUNT
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Install vacuum pump (A) to electronic controlled engine mount
(1). A
3. Check that a vacuum is maintained when applying the vacuum
of -40 kPa (-0.41 kg/cm2, -5.8 psi) to electronic controlled engine
mount. EC
4. Also visually check electronic controlled engine mount.
Is the inspection result normal?
YES >> GO TO 8. C
NO >> Replace electronic controlled engine mount. Refer to
EC-38, "Component Parts Location".
MBIB1237E

8.CHECK INTERMITTENT INCIDENT D

Refer to GI-41, "Intermittent Incident".

Is the inspection result normal? E
YES >> Replace intake manifold collector. Refer to .EM-25, "Removal and Installation"
NO >> Repair or replace malfunctioning part.
Component Inspection INFOID:0000000010095212
F

1.CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE

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G
With CONSULT
1. Turn ignition switch OFF.
2. Reconnect electronic controlled engine mount control solenoid valve harness connector.
3. Disconnect vacuum hoses connected to electronic controlled engine mount control solenoid valve. H
4. Turn ignition switch ON.
5. Select “ENGINE MOUNTING” in “ACTIVE TEST” mode with CONSULT.
6. Check air passage continuity and operation delay time under the I
following conditions.

Condition Air passage continuity Air passage continuity J

(ENGINE MOUNTING) between (A) and (B) between (A) and (C)
TRVL Existed Not existed
IDLE Not existed Existed K
Without CONSULT
1. Turn ignition switch OFF.
2. Disconnect electronic controlled engine mount control solenoid JMBIA0180ZZ L
valve harness connector.
3. Disconnect vacuum hoses connected to electronic controlled engine mount control solenoid valve.
4. Check air passage continuity and operation delay time under the M
following conditions.

Air passage continuity Air passage continuity

Condition N
between (A) and (B) between (A) and (C)
12 V direct current supply be-
Existed Not existed
tween terminals 1 and 2
O
No supply Not existed Existed
Is the inspection result normal?
YES >> INSPECTION END PBIB2532E
P
NO >> Replace electronic controlled engine mount control sole-
noid valve.

Revision: August 2013 EC-495 2014 Maxima NAM

 FUEL INJECTOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
FUEL INJECTOR
Description INFOID:0000000010095213

The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow via the fuel injector into the intake manifold. The
amount of fuel injected depends upon the injection pulse duration.
Pulse duration is the length of time the fuel injector remains open.
The ECM controls the injection pulse duration based on engine fuel
needs.

PBIA9664J

Component Function Check INFOID:0000000010095214

1.INSPECTION START
Turn ignition switch to START.

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Are any cylinders ignited?
YES >> GO TO 2.
NO >> Go to EC-496, "Diagnosis Procedure".
2.CHECK FUEL INJECTOR FUNCTION
With CONSULT
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
3. Check that each circuit produces a momentary engine speed drop.
Without CONSULT
1. Start engine.
2. Listen to each fuel injector operating sound.

Clicking sound should be heard.

Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-496, "Diagnosis Procedure".

PBIB3332E

Diagnosis Procedure INFOID:0000000010095215

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.

Revision: August 2013 EC-496 2014 Maxima NAM

 FUEL INJECTOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check the voltage between fuel injector harness connector and
ground. A

Fuel injector
Ground Voltage
Cylinder Connector Terminal EC
1 F17 1
2 F18 1
C
3 F19 1
Ground Battery voltage
4 F20 1 PBIB0582E

5 F21 1 D
6 F22 1
Is the inspection result normal?
E
YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART F
Check the following.
• 10 A fuse (No. 35)

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• IPDM E/R harness connector E10 G
• Harness for open or short between fuel injector and fuse

>> Repair open circuit, short to ground or short to power in harness or connectors. H
3.CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. I
3. Check the continuity between fuel injector harness connector and ECM harness connector.

Fuel injector ECM

J
Continuity
Cylinder Connector Terminal Connector Terminal
1 F17 2 32
K
2 F18 2 31
3 F19 2 30
F14 Existed
4 F20 2 29 L
5 F21 2 3
6 F22 2 1
M
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4. N
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL INJECTOR
O
Refer to EC-498, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
P
NO >> Replace malfunctioning fuel injector. Refer to EM-43, "Removal and Installation".
5.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".
NO >> INSPECTION END

Revision: August 2013 EC-497 2014 Maxima NAM

 FUEL INJECTOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Component Inspection INFOID:0000000010095216

1.CHECK FUEL INJECTOR

1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Check resistance between fuel injector terminals as per the fol-
lowing.

Terminals Resistance
1 and 2 11.1 - 14.5 Ω [at 10 - 60°C (50 - 140°F)]
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace malfunctioning fuel injector. Refer to EM-43,
"Removal and Installation".
PBIB1727E

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Revision: August 2013 EC-498 2014 Maxima NAM

 FUEL PUMP
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
FUEL PUMP
A
Description INFOID:0000000010095217

EC
Sensor Input signal to ECM ECM Function Actuator
Crankshaft position sensor (POS) Fuel pump relay
Engine speed*
Camshaft position sensor (PHASE) Fuel pump control ↓ C
Battery Battery voltage* Fuel pump

*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine D
start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
E
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.

Condition Fuel pump operation F

Ignition switch is turned to ON. Operates for 1 second.

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Engine running and cranking Operates.
G
When engine is stopped Stops in 1.5 seconds.
Except as shown above Stops.
H
Component Function Check INFOID:0000000010095218

1.CHECK FUEL PUMP FUNCTION I

1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
J
: Vehicle front (Illustration shows
the view with intake air duct re-
moved)
K
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
L
Is the inspection result normal?
YES >> INSPECTION END ALBIA0612ZZ

NO >> EC-499, "Diagnosis Procedure".

M
Diagnosis Procedure INFOID:0000000010095219

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". N

1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. O
3. Turn ignition switch ON.

Revision: August 2013 EC-499 2014 Maxima NAM

 FUEL PUMP
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
4. Check the voltage between ECM harness connector and
ground.

ECM
+ – Voltage
Connector Terminal Connector Terminal
F14 14 E10 112 Battery voltage
Is the inspection result normal?
YES >> GO TO 4. JMBIA1890ZZ
NO >> GO TO 2.
2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check the voltage between IPDM E/R harness connector and
ground.

IPDM E/R
Ground Voltage
Connector Terminal
F10 77 Ground Battery voltage

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Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 8.
JMBIA1885ZZ

3.DETECT MALFUNCTIONING PART

Check the following.
• IPDM E/R harness connector F10
• Harness for open or short between IPDM E/R and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check harness continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel
pump” harness connector.

Fuel level sensor unit and fuel

IPDM E/R
pump Continuity
Connector Terminal Connector Terminal
E18 13 B42 1 Existed
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R

>> Repair open circuit or short to power in harness or connectors.

6.CHECK FUEL PUMP GROUND CIRCUIT
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.

Revision: August 2013 EC-500 2014 Maxima NAM

 FUEL PUMP
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

Fuel level sensor unit and fuel A

pump Ground Continuity
Connector Terminal
B42 3 Ground Existed EC

Is the inspection result normal?

YES >> GO TO 7. C
NO >> Repair open circuit or short to power in harness or connector.
7.CHECK FUEL PUMP
Refer to EC-501, "Component Inspection". D
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace fuel pump. Refer to FL-6, "Removal and Installation". E
8.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". F
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".

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NO >> Repair or replace harness or connectors. G
Component Inspection INFOID:0000000010095220

1.CHECK FUEL PUMP H

1. Turn ignition switch OFF.

2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Check resistance between “fuel level sensor unit and fuel pump” I
terminals as per the following.

Terminals Resistance J
1 and 3 0.2 - 5.0 Ω [at 25°C (77°F)]
Is the inspection result normal? K
YES >> INSPECTION END
NO >> Replace “fuel level sensor unit and fuel pump” Refer to
FL-6, "Removal and Installation".
L
SEC918C

Revision: August 2013 EC-501 2014 Maxima NAM

 IGNITION SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
IGNITION SIGNAL
Description INFOID:0000000010095221

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.
Component Function Check INFOID:0000000010095222

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.INSPECTION START
Turn ignition switch OFF, and restart engine.
Does the engine start?
YES-1 >> With CONSULT: GO TO 2.
YES-2 >> Without CONSULT: GO TO 3.
NO >> Go to EC-502, "Diagnosis Procedure".
2.CHECK IGNITION SIGNAL FUNCTION
With CONSULT

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1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
2. Check that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-502, "Diagnosis Procedure".
3.CHECK IGNITION SIGNAL FUNCTION
Without CONSULT
1. Let engine idle.
2. Read the voltage signal between ECM harness connectors.

ECM
+ –
Voltage signal
Connec- Connec-
Terminal Terminal
tor tor
9
10
11
JMBIA1886GB
F14 E10 112
18
19
21 JMBIA0035GB

NOTE:
The pulse cycle changes depending on rpm at idle.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-502, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095223

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

1.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn it ON.

Revision: August 2013 EC-502 2014 Maxima NAM

 IGNITION SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
2. Check the voltage between ECM harness connector and
ground. A

ECM
+ – Voltage EC
Connector
Terminal Terminal
E10 105 112 Battery voltage
C
Is the inspection result normal?
YES >> GO TO 2. JMBIA1887ZZ
NO >> Refer to EC-157, "Diagnosis Procedure". D
2.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector. E
3. Turn ignition switch ON.
4. Check the voltage between condenser harness connector and
ground. F

Condenser

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Ground Voltage
Connector Terminal G
F26 1 Ground Battery voltage
Is the inspection result normal? H
YES >> GO TO 4.
NO >> GO TO 3.
PBIB0624E

3.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III I

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.
J
3. Check the continuity between IPDM E/R harness connector and condenser harness connector.

IPDM E/R Condenser

Continuity K
Connector Terminal Connector Terminal
F10 49 F26 1 Existed
4. Also check harness for short to ground and short to power. L
Is the inspection result normal?
YES >> Refer to EC-157, "Diagnosis Procedure".
NO >> Repair open circuit, short to ground or short to power in harness or connectors. M
4.CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. N
2. Check the continuity between condenser harness connector and ground.

Condenser O
Ground Continuity
Connector Terminal
F26 2 Ground Existed
3. Also check harness for short to power. P
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit or short to power in harness or connectors.
5.CHECK CONDENSER
Refer to EC-506, "Component Inspection (Condenser)"

Revision: August 2013 EC-503 2014 Maxima NAM

 IGNITION SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace condenser.
6.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
1. Reconnect all harness connectors disconnected.
2. Disconnect ignition coil harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ignition coil harness connector and
ground.

Ignition coil
Ground Voltage
Cylinder Connector Terminal
1 F34 3
2 F35 3
3 F36 3
Ground Battery voltage
4 F37 3 PBIB0138E

5 F38 3

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6 F39 3
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace harness or connectors.
7.CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between ignition coil harness connector and ground.

Ignition coil
Ground Continuity
Cylinder Connector Terminal
1 F34 2
2 F35 2
3 F36 2
Ground Existed
4 F37 2
5 F38 2
6 F39 2
3. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair open circuit or short to power in harness or connectors.
8.CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between ignition coil harness connector and ECM harness connector.

Revision: August 2013 EC-504 2014 Maxima NAM

 IGNITION SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

Ignition coil ECM A

Continuity
Cylinder Connector Terminal Connector Terminal
1 F34 1 11
EC
2 F35 1 10
3 F36 1 9
F14 Existed
4 F37 1 21 C
5 F38 1 19
6 F39 1 18
D
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 9. E
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
9.CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to EC-505, "Component Inspection (Ignition Coil with Power Transistor)". F
Is the inspection result normal?

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YES >> GO TO 10.
NO >> Replace malfunctioning ignition coil with power transistor. Refer to EM-42, "Removal and Installa- G
tion (LH)" (LH) or EM-42, "Removal and Installation (RH)" (RH).
10.CHECK INTERMITTENT INCIDENT H
Refer to GI-41, "Intermittent Incident".

>> INSPECTION END I

Component Inspection (Ignition Coil with Power Transistor) INFOID:0000000010095224

1.CHECK IGNITION COIL WITH POWER TRANSISTOR-I J

1. Turn ignition switch OFF.

2. Disconnect ignition coil harness connector.
K
3. Check resistance between ignition coil terminals as per the fol-
lowing.

L
Terminal No. (Polarity) Resistance Ω [at 25°C (77°F)]
1 and 2 Except 0 or ∞
1 and 3 M
Except 0
2 and 3
Is the inspection result normal?
YES >> GO TO 2. N
PBIB0847E
NO >> Replace malfunctioning ignition coil with power transis-
tor. Refer to EM-42, "Exploded View".
2.CHECK IGNITION COIL WITH POWER TRANSISTOR-II O

CAUTION:
Perform the following procedure in a place with no combustible objects and good ventilation.
1. Turn ignition switch OFF. P
2. Reconnect all harness connectors disconnected.
3. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-
dure.
4. Start engine.
5. After engine stalls, crank it two or three times to release all fuel pressure.

Revision: August 2013 EC-505 2014 Maxima NAM

 IGNITION SIGNAL
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
6. Turn ignition switch OFF.
7. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
8. Remove ignition coil and spark plug of the cylinder to be checked. Refer to EM-42, "Removal and Installa-
tion (LH)" (LH) or EM-42, "Removal and Installation (RH)" (RH).
9. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
10. Connect spark plug and harness connector to ignition coil.
11. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
12. Crank engine for about three seconds, and check whether spark
is generated between the spark plug and the grounded metal
portion.

Spark should be generated.

CAUTION:
• Never place the spark plug and the ignition coil within 50
cm (19.7 in) each other. Be careful not to get an electrical JMBIA0066GB

shock while checking, because the electrical discharge

voltage becomes 20 kV or more.
• It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:

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When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunc-
tioning.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace malfunctioning ignition coil with power transistor. Refer to EM-42, "Removal and Installa-
tion (LH)" (LH) or EM-42, "Removal and Installation (RH)" (RH).
Component Inspection (Condenser) INFOID:0000000010095225

1.CHECK CONDENSER
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Check resistance between condenser terminals as per the fol-
lowing.

Terminals Resistance
1 and 2 Above 1 MΩ [at 25C° (77C°)]
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace condenser.

PBIB0794E

Revision: August 2013 EC-506 2014 Maxima NAM

 MALFUNCTION INDICATOR LAMP
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
MALFUNCTION INDICATOR LAMP
A
Description INFOID:0000000010095226

The Malfunction Indicator Lamp (MIL) is located on the combination EC

meter.
The MIL will illuminate when the ignition switch is turned ON without
the engine running. This is a bulb check.
When the engine is started, the MIL should turn off. If the MIL C
remains illuminated, the on board diagnostic system has detected an
engine system malfunction.
For details, refer to EC-135, "DIAGNOSIS DESCRIPTION : Malfunc- D
tion Indicator Lamp (MIL)".

JSBIA1315ZZ E
Component Function Check INFOID:0000000010095227

1.CHECK MIL FUNCTION F

1. Turn ignition switch ON.
2. Check that MIL illuminates.

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G
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-507, "Diagnosis Procedure".
H
Diagnosis Procedure INFOID:0000000010095228

1.CHECK DTC I
Check that DTC UXXXX is not displayed.
Is the inspection result normal?
YES >> GO TO 2. J
NO >> Perform trouble diagnosis for DTC UXXXX. Refer to EC-161, "Description".
2.CHECK COMBINATION METER FUNCTION K
Refer to MWI-29, "CONSULT Function (METER/M&A)".
Is the inspection result normal?
YES >> GO TO 3. L
NO >> Repair or replace.
3.CHECK INTERMITTENT INCIDENT
M
Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-122, "Removal and Installation".
N
NO >> Repair or replace.

Revision: August 2013 EC-507 2014 Maxima NAM

 ON BOARD REFUELING VAPOR RECOVERY (ORVR)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
Description INFOID:0000000010095229

PBIB1068E

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From the beginning of refueling, the air and vapor inside the fuel tank go via the refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.
WARNING:
When conducting inspections below, be sure to observe the following:
• Put a “CAUTION: FLAMMABLE” sign in workshop.
• Never smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Always to furnish the workshop with a CO2 fire extinguisher.
CAUTION:
• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-proof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to EC-592, "Inspection".
- Disconnect battery ground cable.
• Always replace O-ring when the fuel gauge retainer is removed.
• Never kink or twist hose and tube when they are installed.
• Never tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine and check for fuel leakage at connections.
• Never attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.
Component Function Check INFOID:0000000010095230

1.CHECK ORVR FUNCTION

Check whether the following symptoms are present.
• Fuel odor from EVAP canister is strong.
• Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.
Are any symptoms present?
YES >> Go to EC-508, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000010095231

1.INSPECTION START
Check whether the following symptoms are present.
A: Fuel odor from EVAP canister is strong.

Revision: August 2013 EC-508 2014 Maxima NAM

 ON BOARD REFUELING VAPOR RECOVERY (ORVR)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
B: Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.
A or B A
A >> GO TO 2.
B >> GO TO 8.
2.CHECK EVAP CANISTER EC

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached. Refer to FL-14, "Removal and Installation (EVAP Canister)".
C
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal? D
YES >> GO TO 3.
NO >> GO TO 4.
3.CHECK IF EVAP CANISTER IS SATURATED WITH WATER E

Check if water will drain from EVAP canister

Does water drain from the EVAP canister? F
YES >> GO TO 4.
NO >> GO TO 7.

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G

PBIB1213E

4.REPLACE EVAP CANISTER I

Replace EVAP canister with a new one.
J
>> GO TO 5.
5.CHECK DRAIN FILTER
Refer to EC-511, "Component Inspection". K
Is the inspection result normal?
YES >> GO TO 6.
L
NO >> Replace drain filter.
6.DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and drain filter for clogging or poor connection. M

>> Repair or replace EVAP hose. Refer to FL-14, "Removal and Installation (EVAP Canister)".
7.CHECK REFUELING EVAP VAPOR CUT VALVE N

Refer to EC-511, "Component Inspection".

Is the inspection result normal? O
YES >> INSPECTION END
NO >> Replace refueling EVAP vapor cut valve with fuel tank.
8.CHECK EVAP CANISTER P
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached. Refer to FL-14, "Removal and Installation (EVAP Canister)".
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?

Revision: August 2013 EC-509 2014 Maxima NAM

 ON BOARD REFUELING VAPOR RECOVERY (ORVR)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 9.
NO >> GO TO 10.
9.CHECK IF EVAP CANISTER IS SATURATED WITH WATER
Check if water will drain from EVAP canister.
Does water drain from the EVAP canister?
YES >> GO TO 10.
NO >> GO TO 12.

PBIB1213E

10.REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 11.
11.DETECT MALFUNCTIONING PART

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Check the EVAP hose between EVAP canister and drain filter for clogging or poor connection.

>> Repair or replace EVAP hose. Refer to FL-14, "Removal and Installation (EVAP Canister)".
12.CHECK VENT HOSES AND VENT TUBES
Check hoses and tubes between EVAP canister and refueling control valve for clogging, kinks, looseness and
improper connection.
Is the inspection result normal?
YES >> GO TO 13.
NO >> Repair or replace hoses and tubes.
13.CHECK FILLER NECK TUBE
Check recirculation line for clogging, dents and cracks.
Is the inspection result normal?
YES >> GO TO 14.
NO >> Replace filler neck tube.
14.CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-511, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 15.
NO >> Replace refueling EVAP vapor cut valve with fuel tank.
15.CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace fuel filler tube.
16.CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging.
Is the inspection result normal?
YES >> GO TO 17.
NO >> Repair or replace one-way fuel valve with fuel tank. Refer to FL-10, "Removal and Installation".

Revision: August 2013 EC-510 2014 Maxima NAM

 ON BOARD REFUELING VAPOR RECOVERY (ORVR)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]

17.CHECK ONE-WAY FUEL VALVE-II A

1. Check that fuel is drained from the tank.
2. Remove fuel filler tube and hose. Refer to EM-43, "Exploded View".
3. Check one-way fuel valve for operation as per the following.
EC
When a stick is inserted, the valve should open, when removing
stick it should close.
Do not drop any material into the tank.
Is the inspection result normal? C
YES >> INSPECTION END
NO >> Replace fuel filler tube or replace one-way fuel valve
with fuel tank. D

SEF665U
E
Component Inspection INFOID:0000000010095232

REFUELING EVAP VAPOR CUT VALVE F

1.INSPECTION START

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Will CONSULT be used? G
Will CONSULT be used?
YES >> GO TO 2.
NO >> GO TO 3. H
2.CHECK REFUELING EVAP VAPOR CUT VALVE
With CONSULT
1. Turn ignition switch OFF. I
2. Remove fuel tank. Refer to FL-10, "Removal and Installation".
3. Drain fuel from the tank as per the following:
- Remove fuel feed hose located on the fuel gauge retainer. J
- Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other
side to a fuel container.
- Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT.
K
4. Check refueling EVAP vapor cut valve for being stuck to close as per the following.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.
5. Check refueling EVAP vapor cut valve for being stuck to open as per the following. L
- Connect vacuum pump to hose end.
- Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one. M
- Turn fuel tank upside down.

Revision: August 2013 EC-511 2014 Maxima NAM

 ON BOARD REFUELING VAPOR RECOVERY (ORVR)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
- Apply vacuum pressure to hose end [−13.3 kPa (−0.136 kg/cm3, −1.93 psi)] with fuel gauge retainer
remaining open and check that the pressure is applicable.

JMBIA1126GB

Is the inspection result normal?

YES >> INSPECTION END
NO >> Replace refueling EVAP vapor cut valve with fuel tank. Refer to FL-10, "Exploded View".

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3.CHECK REFUELING EVAP VAPOR CUT VALVE
Without CONSULT
1. Turn ignition switch OFF.
2. Remove fuel tank. Refer to FL-10, "Removal and Installation".
3. Drain fuel from the tank as per the following:
- Remove fuel gauge retainer.
- Drain fuel from the tank using a handy pump into a fuel container.
4. Check refueling EVAP vapor cut valve for being stuck to close as per the following.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.
5. Check refueling EVAP vapor cut valve for being stuck to open as per the following.
- Connect vacuum pump to hose end.
- Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.
- Turn fuel tank upside down.
- Apply vacuum pressure to hose end [−13.3 kPa (−0.136 kg/cm3, −1.93 psi)] with fuel gauge retainer
remaining open and check that the pressure is applicable.

JMBIA1126GB

Is the inspection result normal?

YES >> INSPECTION END
NO >> Replace refueling EVAP vapor cut valve with fuel tank. Refer to FL-10, "Exploded View".
DRAIN FILTER

Revision: August 2013 EC-512 2014 Maxima NAM

 ON BOARD REFUELING VAPOR RECOVERY (ORVR)
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance. A
3. Check visually for cracks or flaws in the hose.
4. Blow air into port A and check that it flows freely out of port B.
EC
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter. C

PBIB3641E
E

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G

Revision: August 2013 EC-513 2014 Maxima NAM

 POSITIVE CRANKCASE VENTILATION
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
POSITIVE CRANKCASE VENTILATION
Description INFOID:0000000010095233

SEC921C

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This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas via the PCV valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is drawn from the air inlet tubes into the crankcase. In this process the air passes via the
hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow via the valve.
The flow goes via the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go via
the hose connection to the air inlet tubes under all conditions.

PBIB1588E

Component Inspection INFOID:0000000010095234

1.CHECK PCV VALVE

With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes via the it.
A strong vacuum should be felt immediately when a finger is placed
over valve inlet.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace PCV valve.

PBIB1589E

Revision: August 2013 EC-514 2014 Maxima NAM

 REFRIGERANT PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
REFRIGERANT PRESSURE SENSOR
A
Description INFOID:0000000010095235

The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an EC
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.
C

E
PBIB2657E

F
Component Function Check INFOID:0000000010095236

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".

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1.CHECK REFRIGERANT PRESSURE SENSOR FUNCTION G

1. Start engine and warm it up to normal operating temperature.

2. Turn A/C switch and blower fan switch ON. H
3. Check the voltage between ECM harness connector terminals
under the following conditions.
I
ECM
+ – Voltage (V)
Connector
Terminal Terminal J
39
40
F13 (Refrigerant pressure 1.0 - 4.0
(Sensor ground)
sensor signal)
K
Is the inspection result normal? JMBIA1888ZZ

YES >> INSPECTION END

NO >> Go to EC-515, "Diagnosis Procedure". L
Diagnosis Procedure INFOID:0000000010095237

Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram". M

1.CHECK GROUND CONNECTION
1. Turn A/C switch and blower fan switch OFF. N
2. Stop engine.
3. Turn ignition switch OFF.
4. Check ground connection E9. Refer to Ground Inspection in GI-44, "Circuit Inspection".
Is the inspection result normal? O
YES >> GO TO 2.
NO >> Repair or replace ground connection.
P
2.CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect refrigerant pressure sensor harness connector.
2. Turn ignition switch ON.

Revision: August 2013 EC-515 2014 Maxima NAM

 REFRIGERANT PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
3. Check the voltage between refrigerant pressure sensor harness
connector and ground.

Refrigerant pressure sensor

Ground Voltage (V)
Connector Terminal
E219 1 Ground Approx. 5
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
JMBIA1619ZZ

3.DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• Junction block connectors E44, E45
• IPDM E/R harness connectors E18, E201
• Harness for open or short between ECM and refrigerant pressure sensor

>> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

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1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connec-
tor.

Refrigerant pressure sensor ECM

Continuity
Connector Terminal Connector Terminal
E219 3 F13 40 Existed
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E3, F1
• IPDM E/R harness connectors E18, E201
• Harness for open or short between ECM and refrigerant pressure sensor

>> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connec-
tor.

Refrigerant pressure sensor ECM

Continuity
Connector Terminal Connector Terminal
E219 2 F13 39 Existed
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Revision: August 2013 EC-516 2014 Maxima NAM
 REFRIGERANT PRESSURE SENSOR
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Check the following.
• Harness connectors E3, F1 A
• IPDM E/R harness connectors E18, E201
• Harness for open or short between ECM and refrigerant pressure sensor
EC
>> Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK INTERMITTENT INCIDENT
C
Refer to GI-41, "Intermittent Incident".
Is the inspection result normal?
YES >> Replace refrigerant pressure sensor. Refer to HAC-105, "Removal and Installation" (with color D
display) or HAC-208, "Removal and Installation" (with monochrome display).
NO >> Repair or replace malfunctioning part.

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G

Revision: August 2013 EC-517 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
VARIABLE INDUCTION AIR SYSTEM
Description INFOID:0000000010095238

Power Valves 1 and 2

The power valves 1 and 2 are installed in intake manifold collector and used to control the suction passage of
the variable induction air control system. They are set in the fully closed or fully opened position by the power
valve actuators 1 and 2 operated by the vacuum stored in the vacuum tank. The vacuum to power valve actu-
ators is controlled by the VIAS control solenoid valves 1 and 2.
Component Function Check INFOID:0000000010095239

1.CHECK OVERALL FUNCTION-I

With CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Perform “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.
3. Turn VIAS control solenoid valve 1 “ON” and “OFF”, and check that power valve actuator 1 rod moves.

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ALBIA0613ZZ

1. Power valve actuator 1 2. Power valve actuator 1 rod 3. Power valve actuator 2 rod
4. Power valve actuator 2
: Vehicle front

Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. When revving engine up to 5,000 rpm quickly.
3. Check that power valve actuator 1 rod moves under the following conditions.

ALBIA0613ZZ

1. Power valve actuator 1 2. Power valve actuator 1 rod 3. Power valve actuator 2 rod
4. Power valve actuator 2
: Vehicle front

Condition Operation
Idle Existed
When revving engine up to 5,000 rpm quickly Not existed
Is the inspection result normal?
Revision: August 2013 EC-518 2014 Maxima NAM
 VARIABLE INDUCTION AIR SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
YES >> GO TO 2.
NO >> EC-519, "Diagnosis Procedure". A
2.CHECK OVERALL FUNCTION-II
With CONSULT EC
1. Perform “VIAS S/V-2” in “ACTIVE TEST” mode with CONSULT.
2. Turn VIAS control solenoid valve 2 “ON” and “OFF”, and check that power valve actuator 2 rod moves.

ALBIA0613ZZ

F
1. Power valve actuator 1 2. Power valve actuator 1 rod 3. Power valve actuator 2 rod
4. Power valve actuator 2

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: Vehicle front G

Without CONSULT
1. When revving engine up to 5,000 rpm quickly.
H
2. Check that power valve actuator 2 rod moves under the following conditions.

K
ALBIA0613ZZ

1. Power valve actuator 1 2. Power valve actuator 1 rod 3. Power valve actuator 2 rod L
4. Power valve actuator 2
: Vehicle front
M

Condition Operation
Idle Existed N
When revving engine up to 5,000 rpm quickly Not existed
Is the inspection result normal?
YES >> INSPECTION END O
NO >> EC-519, "Diagnosis Procedure".
Diagnosis Procedure INFOID:0000000010095240
P

1.INSPECTION START
Confirm the malfunctioning system (power valve 1 or power valve 2). Refer to EC-518, "Component Function
Check".
Which system is related to the incident?
Power valve 1>>GO TO 2.

Revision: August 2013 EC-519 2014 Maxima NAM

 VARIABLE INDUCTION AIR SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
Power valve 2>>GO TO 6.
2.CHECK VACUUM EXISTENCE-I
With CONSULT
1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Start engine and let it idle.
3. Perform “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.
4. Turn VIAS control solenoid valve 1 “ON” and “OFF”, and check vacuum existence under the following con-
ditions.

VIAS S/V 1 Vacuum

ON Existed
OFF Not existed

Without CONSULT
1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. When revving engine up to 5,000 rpm quickly.
5. Check vacuum existence under the following conditions.

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Condition Operation
Idle Existed
When revving engine up to 5,000 rpm quickly Not existed
Is the inspection result normal?
YES >> Repair or replace power valve actuator 1. Refer to EC-38, "Component Parts Location".
NO >> GO TO 3.
3.CHECK VACUUM TANK
1. Stop engine and disconnect vacuum hose connected to intake manifold collector.
2. Start engine and let it idle.
3. Check vacuum existence from intake manifold collector.
Does vacuum existence from the intake manifold collector?
YES >> GO TO 4.
NO >> Replace intake manifold collector. Refer to EM-25, "Removal and Installation".
4.CHECK VACUUM HOSE
1. Stop engine.
2. Check vacuum hose for cracks, clogging, improper connection
or disconnection. Refer to EC-117, "System Description".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair hoses or tubes.

SEF109L

5.CHECK VIAS CONTROL SOLENOID VALVE 1

Refer to EC-443, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace VIAS control solenoid valve 1. Refer to EC-38, "Component Parts Location".
6.CHECK VACUUM EXISTENCE-II
Revision: August 2013 EC-520 2014 Maxima NAM
 VARIABLE INDUCTION AIR SYSTEM
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
With CONSULT
1. Stop engine and disconnect vacuum hose connected to power valve actuator 2. A
2. Start engine and let it idle.
3. Perform “VIAS S/V-2” in “ACTIVE TEST” mode with CONSULT.
4. Turn VIAS control solenoid valve 2 “ON” and “OFF”, and check vacuum existence under the following con- EC
ditions.

VIAS S/V 2 Vacuum

C
ON Existed
OFF Not existed

Without CONSULT D
1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine. E
4. When revving engine up to 5,000 rpm quickly.
5. Check vacuum existence under the following conditions.
F
Condition Operation
Idle Existed

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When revving engine up to 5,000 rpm quickly Not existed G
Is the inspection result normal?
YES >> Repair or replace power valve actuator 2. Refer to EC-38, "Component Parts Location".
H
NO >> GO TO 7.
7.CHECK VACUUM HOSE
1. Stop engine. I
2. Check vacuum hose for cracks, clogging, improper connection
or disconnection. Refer to EC-117, "System Description".
Is the inspection result normal? J
YES >> GO TO 8.
NO >> Repair hoses or tubes.
K

L
SEF109L

8.CHECK VIAS CONTROL SOLENOID VALVE 2

M
Refer to EC-446, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 9. N
NO >> Replace VIAS control solenoid valve 2. Refer to EC-38, "Component Parts Location".
9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident". O

>> INSPECTION END

P

Revision: August 2013 EC-521 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

ECU DIAGNOSIS INFORMATION

ECM
Reference Value INFOID:0000000010095241

VALUES ON THE DIAGNOSIS TOOL

NOTE:
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-
ble to this vehicle, refer to CONSULT display items.
• Numerical values in the following table are reference values.
• These values are input/output values that ECM receives/transmits and may differ from actual operations.
Example: The ignition timing shown by the timing light may differ from the ignition timing displayed on the data
monitor. This occurs because the timing light shows a value calculated by ECM according to signals received
from the cam shaft position sensor and other sensors related to ignition timing.
For outlines of following items, refer to EC-138, "CONSULT Function".

Monitor Item Condition Values/Status

Almost the same speed as
ENG SPEED Run engine and compare CONSULT value with the tachometer indication.
the tachometer indication.

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MAS A/F SE-B1 See EC-149, "Description".
B/FUEL SCHDL See EC-149, "Description".
A/F ALPHA-B1 See EC-149, "Description".
A/F ALPHA-B2 See EC-149, "Description".
COOLAN TEMP/S • Engine: After warming up More than 70°C (158°F)
A/F SEN1 (B1) • Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 2.2 V
A/F SEN1 (B2) • Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 2.2 V
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
0 - 0.3 V ←→ Approx. 0.6 -
HO2S2 (B1) - Engine: After warming up
1.0 V
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
0 - 0.3 V ←→ Approx. 0.6 -
HO2S2 (B2) - Engine: After warming up
1.0 V
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
HO2S2 MNTR (B1) - Engine: After warming up LEAN ←→ RICH
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
HO2S2 MNTR (B2) - Engine: After warming up LEAN ←→ RICH
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
• Turn drive wheels and compare CONSULT value with the speedometer indi- Almost the same speed as
VHCL SPEED SE
cation. speedometer indication
BATTERY VOLT • Ignition switch: ON (Engine stopped) 11 - 14 V

• Ignition switch: ON Accelerator pedal: Fully released 0.5 - 1.0 V

ACCEL SEN 1
(Engine stopped) Accelerator pedal: Fully depressed 4.2 - 4.8 V

• Ignition switch: ON Accelerator pedal: Fully released 0.5 - 1.0 V

ACCEL SEN 2*1 (Engine stopped) Accelerator pedal: Fully depressed 4.2 - 4.8 V

Revision: August 2013 EC-522 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Monitor Item Condition Values/Status
A
• Ignition switch: ON Accelerator pedal: Fully released More than 0.36 V
TP SEN 1-B1 (Engine stopped)
• Selector lever: D Accelerator pedal: Fully depressed Less than 4.75 V

• Ignition switch: ON Accelerator pedal: Fully released More than 0.36 V EC

TP SEN 2-B1*1 (Engine stopped)
• Selector lever: D Accelerator pedal: Fully depressed Less than 4.75 V

FUEL T/TMP SE • Ignition switch: ON

Indicates fuel tank tempera- C
ture
Indicates intake air tempera-
INT/A TEMP SE • Ignition switch: ON
ture D
EVAP SYS PRES • Ignition switch: ON Approx. 1.8 - 4.8 V
Depending on fuel level of
FUEL LEVEL SE • Ignition switch: ON
fuel tank E
START SIGNAL • Ignition switch: ON → START → ON OFF → ON → OFF

• Ignition switch: ON Accelerator pedal: Fully released ON

CLSD THL POS F
(Engine stopped) Accelerator pedal: Slightly depressed OFF
Air conditioner switch: OFF OFF
• Engine: After warming up, idle the

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AIR COND SIG Air conditioner switch: ON
engine ON G
(Compressor operates.)
Selector lever: P or N ON
P/N POSI SW • Ignition switch: ON
Selector lever: Except above OFF H
• Engine: After warming up, idle the Steering wheel: Not being turned OFF
PW/ST SIGNAL
engine Steering wheel: Being turned ON
Rear window defogger switch: ON I
and/or ON
LOAD SIGNAL • Ignition switch: ON Lighting switch: 2nd position
Rear window defogger switch and lighting J
OFF
switch: OFF
IGNITION SW • Ignition switch: ON → OFF → ON ON → OFF → ON
Heater fan switch: ON ON K
• Engine: After warming up, idle the
HEATER FAN SW
engine Heater fan switch: OFF OFF
Brake pedal: Fully released OFF
BRAKE SW • Ignition switch: ON L
Brake pedal: Slightly depressed ON
• Engine: After warming up Idle 2.0 - 3.0 msec
• Selector lever: P or N
INJ PULSE-B1 M
• Air conditioner switch: OFF 2,000 rpm 1.9 - 2.9 msec
• No load
• Engine: After warming up Idle 2.0 - 3.0 msec
• Selector lever: P or N N
INJ PULSE-B2
• Air conditioner switch: OFF 2,000 rpm 1.9 - 2.9 msec
• No load
• Engine: After warming up Idle 7° - 17° BTDC O
• Selector lever: P or N
IGN TIMING
• Air conditioner switch: OFF 2,000 rpm 25° - 45° BTDC
• No load
P
• Engine: After warming up Idle 5% - 35%
• Selector lever: P or N
CAL/LD VALUE
• Air conditioner switch: OFF 2,500 rpm 5% - 35%
• No load
• Engine: After warming up Idle 2.0 - 6.0 g/s
• Selector lever: P or N
MASS AIRFLOW
• Air conditioner switch: OFF 2,500 rpm 7.0 - 20.0 g/s
• No load

Revision: August 2013 EC-523 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Monitor Item Condition Values/Status

• Engine: After warming up Idle

• Selector lever: P or N (Accelerator pedal: Not depressed even 0%
PURG VOL C/V slightly, after engine starting.)
• Air conditioner switch: OFF
• No load 2,000 rpm —
• Engine: After warming up Idle −5° - 5°CA
• Selector lever: P or N
INT/V TIM (B1)
• Air conditioner switch: OFF 2,000 rpm Approx. 0° - 30°CA
• No load
• Engine: After warming up Idle −5° - 5°CA
• Selector lever: P or N
INT/V TIM (B2)
• Air conditioner switch: OFF 2,000 rpm Approx. 0° - 30°CA
• No load
• Engine: After warming up Idle −5° - 5°CA
• Selector lever: P or N
EXH/V TIM (B1) Around 2,500 rpm while the engine speed
• Air conditioner switch: OFF Approx. 0° - 30°CA
• No load is rising

• Engine: After warming up Idle −5° - 5°CA

• Selector lever: P or N
EXH/V TIM (B2) Around 2,500 rpm while the engine speed
• Air conditioner switch: OFF Approx. 0° - 30°CA
is rising

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• No load
• Engine: After warming up Idle 0% - 2%
• Selector lever: P or N
INT/V SOL (B1)
• Air conditioner switch: OFF 2,000 rpm Approx. 0% - 50%
• No load
• Engine: After warming up Idle 0% - 2%
• Selector lever: P or N
INT/V SOL (B2)
• Air conditioner switch: OFF 2,000 rpm Approx. 0% - 50%
• No load
• Engine: After warming up Idle 0% - 2%
• Selector lever: P or N
VTC DTY EX B1 Around 2,500 rpm while the engine speed
• Air conditioner switch: OFF Approx. 0% - 70%
• No load is rising

• Engine: After warming up Idle 0% - 2%

• Selector lever: P or N
VTC DTY EX B2 Around 2,500 rpm while the engine speed
• Air conditioner switch: OFF Approx. 0% - 70%
• No load is rising

• Engine: After warming up

• Selector lever: P or N When revving engine up to 5,000 rpm
VIAS S/V-1 OFF →ON → OFF
• Air conditioner switch: OFF quickly
• No load
• Engine: After warming up
• Selector lever: P or N When revving engine up to 5,000 rpm
VIAS S/V-2 OFF →ON → OFF
• Air conditioner switch: OFF quickly
• No load
Air conditioner switch: OFF OFF
• Engine: After warming up, idle the
AIR COND RLY Air conditioner switch: ON
engine ON
(Compressor operates)
Below 950 rpm IDLE
ENGINE MOUNT • Engine: After warming up
Above 950 rpm TRVL
• For 1 second after turning ignition switch: ON
ON
FUEL PUMP RLY • Engine running or cranking
• Except above OFF
VENT CONT/V • Ignition switch: ON OFF
THRTL RELAY • Ignition switch: ON ON

Revision: August 2013 EC-524 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Monitor Item Condition Values/Status
A
Engine coolant temperature: 97°C
OFF
(206°F) or less
Engine coolant temperature: Between
• Engine: After warming up, idle the Low EC
98°C (208°F) and 99°C (210°F)
COOLING FAN engine
• Air conditioner switch: OFF Engine coolant temperature: Between
Mid
100°C (212°F) and 104°C (219°F)
Engine coolant temperature: 105°C C
Hi
(221°F) or more
• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up D
ON
HO2S2 HTR (B1) - Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
• Engine speed: Above 3,600 rpm OFF E
• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
ON
HO2S2 HTR (B2) - Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
F
• Engine speed: Above 3,600 rpm OFF

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Almost the same speed as
I/P PULLY SPD • Vehicle speed: More than 20 km/h (12 MPH) G
the tachometer indication
• Turn drive wheels and compare CONSULT value with the speedometer indi- Almost the same speed as
VEHICLE SPEED
cation. the speedometer indication
H
Idle air volume learning has not been per-
YET
formed yet.
IDL A/V LEARN • Engine: Running
Idle air volume learning has already been
performed successfully.
CMPLT I

ENG OIL TEMP • Engine: After warming up More than 70°C (158°F)
Vehicle has traveled after MIL has illumi- 0 - 65,535 km J
TRVL AFTER MIL • Ignition switch: ON
nated. (0 - 40,723 miles)
• Engine: After warming up, idle the engine
A/F S1 HTR (B1) 4 - 100%
(More than 140 seconds after starting engine)
K
• Engine: After warming up, idle the engine
A/F S1 HTR (B2) 4 - 100%
(More than 140 seconds after starting engine)
• Engine: Idle
AC PRESS SEN 1.0 - 4.0 V L
• Both A/C switch and blower fan switch: ON (Compressor operates)
• Turn drive wheels and compare CONSULT value with the speedometer indi- Almost the same speed as
VHCL SPEED SE
cation. the speedometer indication
M
The preset vehicle speed is
SET VHCL SPD • Engine: Running ASCD: Operating
displayed
MAIN switch: Pressed ON
MAIN SW • Ignition switch: ON N
MAIN switch: Released OFF
CANCEL switch: Pressed ON
CANCEL SW • Ignition switch: ON
CANCEL switch: Released OFF O
RESUME/ACCELERATE switch:
ON
Pressed
RESUME/ACC SW • Ignition switch: ON
RESUME/ACCELERATE switch: Re- P
OFF
leased
SET/COAST switch: Pressed ON
SET SW • Ignition switch: ON
SET/COAST switch: Released OFF

BRAKE SW1 Brake pedal: Fully released ON

• Ignition switch: ON
(ASCD brake switch) Brake pedal: Slightly depressed OFF

Revision: August 2013 EC-525 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Monitor Item Condition Values/Status

BRAKE SW2 Brake pedal: Fully released OFF

• Ignition switch: ON
(Stop lamp switch) Brake pedal: Slightly depressed ON
VHCL SPD CUT • Ignition switch: ON NON
LO SPEED CUT • Ignition switch: ON NON
AT OD MONITOR • Ignition switch: ON OFF
AT OD CANCEL • Ignition switch: ON OFF
MAIN switch: Pressed at the 1st time →
CRUISE LAMP • Ignition switch: ON ON → OFF
at the 2nd time
• MAIN switch: ON ASCD: Operating ON
• When vehicle speed is between
SET LAMP
40 km/h (25 MPH) and 144 km/h ASCD: Not operating OFF
(89 MPH)
Exhaust Valve Timing Control Learning
YET
has not been performed yet.
EXH V/T LEARN • Engine: Running
Exhaust Valve Timing Control Learning
CMPLT
has not been performed yet.
• Power generation voltage variable control: Operating ON

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ALT DUTY SIG
• Power generation voltage variable control: Not operating OFF
A/F ADJ-B1 • Engine: Running −0.330 - 0.330
A/F ADJ-B2 • Engine: Running −0.330 - 0.330
• Engine speed: Idle
• Battery: Fully charged*2
BAT CUR SEN • Selector lever: P or N Approx. 2,600 - 3,500 mV
• Air conditioner switch: OFF
• No load
ALT DUTY • Engine: Idle 0 - 80%
NOTE:
THRTL STK CNT B1 —
The item is indicated, but not used.
Indicates the condition of
EVAP LEAK DIAG Ignition switch: ON
EVAP leak diagnosis.
Indicates the ready condition
EVAP DIAG READY Ignition switch: ON
of EVAP leak diagnosis.

A/F SEN1 DIAG1 DTC P015A and P015B self-diagnosis incomplete. INCMP
(B1) DTC P015A and P015B self-diagnosis is complete. CMPLT

A/F SEN1 DIAG1 DTC P015C and P015D self-diagnosis incomplete. INCMP
(B2) DTC P015C and P015D self-diagnosis is complete. CMPLT

A/F SEN1 DIAG2 DTC P014C and P014D self-diagnosis incomplete. INCMP
(B1) DTC P014C and P014D self-diagnosis is complete. CMPLT

A/F SEN1 DIAG2 DTC P014E and P014F self-diagnosis incomplete. INCMP
(B2) DTC P014E and P014F self-diagnosis is complete. CMPLT
The vehicle condition is not within the diagnosis range of DTC P014C, P014D,
ABSNT
A/F SEN1 DIAG3 P015A or P015B.
(B1) The vehicle condition is within the diagnosis range of DTC P014C, P014D,
PRSNT
P015A or P015B.
The vehicle condition is not within the diagnosis range of DTC P014E, P014F,
ABSNT
A/F SEN1 DIAG3 P015C or P015D.
(B2) The vehicle condition is within the diagnosis range of DTC P014E, P014F,
PRSNT
P015C or P015D.
DTC P0139 self-diagnosis (delayed response) is incomplete. INCMP
HO2 S2 DIAG1(B1)
DTC P0139 self-diagnosis (delayed response) is complete. CMPLT

Revision: August 2013 EC-526 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Monitor Item Condition Values/Status
A
DTC P0159 self-diagnosis (delayed response) is incomplete. INCMP
HO2 S2 DIAG1(B2)
DTC P0159 self-diagnosis (delayed response) is complete. CMPLT
DTC P0139 self-diagnosis (slow response) is incomplete. INCMP EC
HO2 S2 DIAG2(B1)
DTC P0139 self-diagnosis (slow response) is complete. CMPLT
DTC P0159 self-diagnosis (slow response) is incomplete. INCMP
HO2 S2 DIAG2(B2)
DTC P0159 self-diagnosis (slow response) is complete. CMPLT C
A/F-S ATMSPHRC Varies depending on vehicle
Engine: After warming up, idle the engine
CRCT B1 environment.
D
A/F-S ATMSPHRC Varies depending on vehicle
Engine: After warming up, idle the engine
CRCT B2 environment.
A/F-S ATMSPHRC Varies depending on the
Engine: Running E
CRCT UP B1 number of updates.
A/F-S ATMSPHRC Varies depending on the
Engine: Running
CRCT UP B2 number of updates.
*1: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ F
from ECM terminals voltage signal.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to PG-2, "How to Handle Battery".

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G
TERMINAL LAYOUT

J
PBIA9221J

PHYSICAL VALUES
K
NOTE:
• ECM is located in the engine room left side near battery. For this inspection, remove passenger side instru-
ment lower panel.
L
• Specification data are reference values.
• Pulse signal is measured by CONSULT.

Revision: August 2013 EC-527 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

Terminal No. Description

Value
Input/ Condition
+ -– Signal name (Approx.)
Output
1 BATTERY VOLTAGE
Fuel injector No. 6
(P/B) (11 - 14 V)
[Engine is running]
3
Fuel injector No. 5 • Warm-up condition
(L/W)
• Idle speed
NOTE:
The pulse cycle changes de-
29
Fuel injector No. 4 pending on rpm at idle
(LG/R)

112 JMBIA0047GB
Output
30 (B) BATTERY VOLTAGE
Fuel injector No. 3
(R/Y) (11 - 14 V)
31
Fuel injector No. 2
(R/W) [Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
32
Fuel injector No. 1
(R/B)

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JMBIA0048GB

2 112 Throttle control motor relay BATTERY VOLTAGE

Input [Ignition switch: ON]
(G/W) (B) power supply (11 - 14 V)

2.9 - 8.8 V

[Engine is running]
• Warm-up condition
4 112 A/F sensor 1 heater
Output • Idle speed
(BR/Y) (B) (Bank 1)
(More than 140 seconds after
starting engine)

JMBIA0902GB

0 - 14 V

[Ignition switch: ON]

• Engine stopped
• Selector lever: D
• Accelerator pedal: Fully de-
pressed

5 112 JMBIA0031GB
Throttle control motor (Open) Output
(L) (B)
0 - 14 V

[Ignition switch: ON]

• Engine stopped
• Selector lever: D
• Accelerator pedal: Fully re-
leased

JMBIA0032GB

0 - 14 V

[Ignition switch: ON]

• Engine stopped
6 112
Throttle control motor (Close) Output • Selector lever: D
(P) (B)
• Accelerator pedal: Fully re-
leased

JMBIA1125GB

Revision: August 2013 EC-528 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value A
Input/ Condition
+ -– Signal name (Approx.)
Output

2.9 - 8.8 V
EC
[Engine is running]
• Warm-up condition
8 112
A/F sensor 1 heater (Bank 2) Output • Idle speed
(SB) (B) C
(More than 140 seconds after
starting engine)

D
JMBIA0030GB

9 0 - 0.2 V
Ignition signal No. 3
(L/B)
[Engine is running]
10 • Warm-up condition E
Ignition signal No. 2
(G/R) • Idle speed
NOTE:
The pulse cycle changes de-
11
Ignition signal No. 1 pending on rpm at idle F
(Y/R)
112 JMBIA0035GB
Output
18 (B)

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Ignition signal No. 6 0.1 - 0.4 V
(GR/R) G
19
Ignition signal No. 5 [Engine is running]
(P)
• Warm-up condition
• Engine speed: 2,000 rpm H
21
Ignition signal No. 4
(W)
JMBIA0036GB
I
12
— ECM ground — — —
(B)
[Engine is running] 10 V
• Engine speed: Below 3,600 J
rpm after the following condi-
tions are met
- Engine: after warming up
K
- Keeping the engine speed be-
13 112 Heated oxygen sensor 2 heat- tween 3,500 and 4,000 rpm
Output for 1 minute and at idle for 1
(P/B) (B) er (Bank 1)
minute under no load JMBIA0902GB
L
[Ignition switch: ON]
• Engine stopped
BATTERY VOLTAGE
[Engine is running]
(11 - 14 V) M
• Engine speed: Above 3,600
rpm
[Ignition switch: ON]
• For 1 second after turning ig- N
0 - 1.5 V
nition switch ON
14 112 [Engine is running]
Fuel pump relay Output
(GR) (B)
[Ignition switch: ON] O
BATTERY VOLTAGE
• More than 1 second after turn-
(11 - 14 V)
ing ignition switch ON
0 - 1.0 V
P
↓
15 112 [Ignition switch: ON → OFF] BATTERY VOLTAGE (11 - 14 V)
Throttle control motor relay Output ↓
(O) (B)
0V
[Ignition switch: ON] 0 - 1.0 V
16
— ECM ground — — —
(B/Y)

Revision: August 2013 EC-529 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value
Input/ Condition
+ -– Signal name (Approx.)
Output
[Engine is running] 10 V
• Engine speed: Below 3,600
rpm after the following condi-
tions are met
- Engine: after warming up
- Keeping the engine speed be-
17 112 Heated oxygen sensor 2 heat- tween 3,500 and 4,000 rpm
Output for 1 minute and at idle for 1
(R) (B) er (Bank 2)
minute under no load JMBIA0902GB

[Ignition switch: ON]

• Engine stopped
BATTERY VOLTAGE
[Engine is running]
(11 - 14 V)
• Engine speed: Above 3,600
rpm
[Engine is running]
[Ignition switch: OFF]
0 - 1.5 V
• A few seconds after turning
24 112 ECM relay ignition switch OFF
Output
(W/B) (B) (Self shut-off)

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[Ignition switch: OFF]
BATTERY VOLTAGE
• More than a few seconds after
(11 - 14 V)
turning ignition switch OFF
BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
• Idle speed
• Accelerator pedal: Not de-
pressed even slightly, after
engine starting

25 112 EVAP canister purge volume JMBIA0039GB

Output
(P/L) (B) control solenoid valve BATTERY VOLTAGE
(11 - 14 V)

[Engine is running]
• Engine speed: About 2,000
rpm (More than 100 seconds
after starting engine)

JMBIA0040GB

[Engine is running]
BATTERY VOLTAGE
• Warm-up condition
(11 - 14 V)
• Idle speed
26 112 BATTERY VOLTAGE (11 - 14 V)
VIAS control solenoid valve 2 Output [Engine is running]
(GR/B) (B) ↓
• Warm-up condition
0 - 1.0 V
• When revving engine up to
↓
5,000 rpm quickly
BATTERY VOLTAGE (11 - 14 V)
[Engine is running]
BATTERY VOLTAGE
• Warm-up condition
(11 - 14 V)
• Idle speed
27 112 BATTERY VOLTAGE (11 - 14 V)
VIAS control solenoid valve 1 Output [Engine is running]
(V) (B) ↓
• Warm-up condition
0 - 1.0 V
• When revving engine up to
↓
5,000 rpm quickly
BATTERY VOLTAGE (11 - 14 V)

Revision: August 2013 EC-530 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value A
Input/ Condition
+ -– Signal name (Approx.)
Output
[Engine is running]
• For 2 seconds right after drop- 0 - 1.0 V EC
ping to 950 rpm or less
[Engine is running]
28 112 Electronic controlled engine
Output
• After a lapse of 2 seconds af-
2.0 - 3.0 V C
(BR/W) (B) mount control solenoid valve ter the engine speed reaches
950 rpm or less
[Engine is running] D
BATTERY VOLTAGE
• Engine speed: More than 950
(11 - 14 V)
rpm
[Engine is running]
• Revving engine from idle to E
3,000 rpm quickly after the fol-
lowing conditions are met
33 35 Heated oxygen sensor 2
Input - Engine: after warming up 0 - 1.0 V
(W) (B) (Bank 1)
- Keeping the engine speed be-
F
tween 3,500 and 4,000 rpm
for 1 minute and at idle for 1

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minute under no load G
[Engine is running]
• Revving engine from idle to
3,000 rpm quickly after the fol-
lowing conditions are met
H
34 35 Heated oxygen sensor 2
Input - Engine: after warming up 0 - 1.0 V
(W/L) (B) (Bank 2)
- Keeping the engine speed be-
tween 3,500 and 4,000 rpm
I
for 1 minute and at idle for 1
minute under no load
35 Sensor ground
— — — — J
(B) (Heated oxygen sensor 2)
36 Sensor ground
— — — —
(B) (Throttle position sensor)
[Ignition switch: ON]
K
• Engine stopped
• Selector lever: D More than 0.36 V
• Accelerator pedal: Fully re- L
37 36 leased
Throttle position sensor 1 Input
(W) (B) [Ignition switch: ON]
• Engine stopped
• Selector lever: D Less than 4.75 V M
• Accelerator pedal: Fully de-
pressed
[Ignition switch: ON] N
• Engine stopped
• Selector lever: D Less than 4.75 V
• Accelerator pedal: Fully re-
leased O
38 36
Throttle position sensor 2 Input
(R) (B) [Ignition switch: ON]
• Engine stopped
• Selector lever: D More than 0.36 V P
• Accelerator pedal: Fully de-
pressed
[Engine is running]
• Warm-up condition
39 40
Refrigerant pressure sensor Input • Both A/C switch and blower 1.0 - 4.0 V
(R) (G)
fan motor switch: ON (Com-
pressor operates)

Revision: August 2013 EC-531 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value
Input/ Condition
+ -– Signal name (Approx.)
Output
40 Sensor ground
— — — —
(G) (Refrigerant pressure sensor)
[Engine is running]
0.5 - 4.5 V
• Steering wheel: Being turned
41 48 Power steering pressure sen-
Input [Engine is running]
(O/B) (B/P) sor
• Steering wheel: Not being 0.4 - 0.8 V
turned
[Engine is running]
42 44
(BR) (G/B)
Battery current sensor Input • Battery: Fully charged*2 2.6 - 3.5 V
• Idle speed
44 Sensor ground
— — — —
(G/B) (Battery current sensor)
[Engine is running] 2.2 V
45 49
A/F sensor 1 (Bank 1) Input • Warm-up condition Output voltage varies with air fuel
(P) (L)
• Engine speed: 2,000 rpm ratio.
0 - 4.8 V
46 52 Engine coolant temperature

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Input [Engine is running] Output voltage varies with engine
(Y) (B/R) sensor
coolant temperature.
47 36 Sensor power supply
— [Ignition switch: ON] 5V
(G) (B) (Throttle position sensor)
Sensor ground
48
— (Power steering pressure — — —
(B/P)
sensor)
49 112
A/F sensor 1 (Bank 1) Input [Ignition switch: ON] 1.8 V
(L) (B)
0 - 4.8 V
50 56
Intake air temperature sensor Input [Engine is running] Output voltage varies with intake
(L/Y) (G/B)
air temperature.
51 44 Sensor power supply
— [Ignition switch: ON] 5V
(R/Y) (G/B) (Battery current sensor)
Sensor ground
52 (Engine coolant temperature
— — — —
(B/R) sensor/Engine oil tempera-
ture sensor)
[Engine is running] 2.2 V
53 57
A/F sensor 1 (Bank 2) Input • Warm-up condition Output voltage varies with air fuel
(V) (LG)
• Engine speed: 2,000 rpm ratio.
0 - 4.8 V
54 52
Engine oil temperature sensor Input [Engine is running] Output voltage varies with engine
(G) (B/R)
oil temperature.
Sensor power supply
55 48
(Power steering pressure — [Ignition switch: ON] 5V
(SB) (B/P)
sensor)
Sensor ground
56
— (Mass air flow sensor/Intake — — —
(G/B)
air temperature sensor)
57 112
A/F sensor 1 (Bank 2) Input [Ignition switch: ON] 1.8 V
(LG) (B)

Revision: August 2013 EC-532 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value A
Input/ Condition
+ -– Signal name (Approx.)
Output
[Engine is running]
• Warm-up condition 0.9 - 1.2 V EC
58 56 • Idle speed
Mass air flow sensor Input
(O) (G/B) [Engine is running]
• Warm-up condition 1.6 - 1.9 V C
• Engine speed: 2,500 rpm
Sensor power supply
[Camshaft position sensor D
59 64
(PHASE) (Bank 1)/Exhaust — [Ignition switch: ON] 5V
(G/W) (B/R)
valve timing control position
sensor (Bank 1)]
Sensor ground E
60
— [Crankshaft position sensor — — —
(Y/B)
(POS)]
61 67 [Engine is running] F
(B) (GR)
Knock sensor (Bank 1) Input
• Idle speed 2.5 V*1

62 67 [Engine is running]

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(W) (GR)
Knock sensor (Bank 2) Input
• Idle speed 2.5 V*1
G
Sensor power supply
[Camshaft position sensor
63 68
(PHASE) (Bank 2)/Exhaust — [Ignition switch: ON] 5V
(R/W) (Y/G)
valve timing control position H
sensor (Bank 2)]
Sensor ground
[Camshaft position sensor I
64
— (PHASE) (Bank 1)/Exhaust — — —
(B/R)
valve timing control position
sensor (Bank 1)]
J
4.0 - 5.0 V
[Engine is running]
• Warm-up condition
• Idle speed K
NOTE:
The pulse cycle changes de-
pending on rpm at idle L
65 60 Crankshaft position sensor JMBIA0041GB
Input
(W/B) (Y/B) (POS)
4.0 - 5.0 V
M

[Engine is running]
• Engine speed: 2,000 rpm
N

JMBIA0042GB

Revision: August 2013 EC-533 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value
Input/ Condition
+ -– Signal name (Approx.)
Output

4.0 - 5.0 V
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes de-
pending on rpm at idle

66 64 Exhaust valve timing control JMBIA0043GB

Input
(LG/R) (B/R) position sensor (Bank 1)
4.0 - 5.0 V

[Engine is running]
• Warm-up condition
• Engine speed is 2,000 rpm

JMBIA0044GB

67 Sensor ground

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— — — —
(GR) (Knock sensor)
Sensor ground
[Camshaft position sensor
68
— (PHASE) (Bank 2)/Exhaust — — —
(Y/G)
valve timing control position
sensor (Bank 2)]

3.0 - 5.0 V
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes de-
pending on rpm at idle

69 68 Camshaft position sensor JMBIA0045GB

Input
(BR/W) (Y/G) (PHASE) (Bank 2)
3.0 - 5.0 V

[Engine is running]
• Engine speed is 2,000 rpm

JMBIA0046GB

Revision: August 2013 EC-534 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value A
Input/ Condition
+ -– Signal name (Approx.)
Output

3.0 - 5.0 V
EC
[Engine is running]
• Warm-up condition
• Idle speed
NOTE: C
The pulse cycle changes de-
pending on rpm at idle

70 64 Camshaft position sensor JMBIA0045GB

D
Input
(W/R) (B/R) (PHASE) (Bank 1)
3.0 - 5.0 V

E
[Engine is running]
• Engine speed is 2,000 rpm

F
JMBIA0046GB

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4.0 - 5.0 V
[Engine is running] G
• Warm-up condition
• Idle speed
NOTE:
H
The pulse cycle changes de-
pending on rpm at idle

71 68 Exhaust valve timing control JMBIA0043GB

(Y/V) (Y/G) position sensor (Bank 2)

Input I
4.0 - 5.0 V

[Engine is running] J
• Warm-up condition
• Engine speed is 2,000 rpm

K
JMBIA0044GB

72 40 Sensor power supply

— [Ignition switch: ON] 5V
(BR/W) (G) (Refrigerant pressure sensor) L
[Engine is running]
BATTERY VOLTAGE
• Warm-up condition
(11 - 14 V)
• Idle speed
M
7 - 12 V
75 112 Intake valve timing control so-
Output
(Y) (B) lenoid valve (Bank 2) [Engine is running] N
• Warm-up condition
• Engine speed: 2,000 rpm

O
JMBIA0038GB

Sensor power supply

76 60
[Crankshaft position sensor — [Ignition switch: ON] 5V P
(R/G) (Y/B)
(POS)]
77 112 Power supply for ECM (Back- BATTERY VOLTAGE
Input [Ignition switch: OFF]
(W/L) (B) up) (11 - 14 V)

Revision: August 2013 EC-535 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value
Input/ Condition
+ -– Signal name (Approx.)
Output
[Engine is running]
BATTERY VOLTAGE
• Warm-up condition
(11 - 14 V)
• Idle speed

7 - 12 V
78 112 Intake valve timing control so-
Output
(R/L) (B) lenoid valve (Bank 1) [Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

JMBIA0038GB

[Engine is running]
BATTERY VOLTAGE
• Warm-up condition
(11 - 14 V)
• Idle speed

7 - 12 V
79 112 Exhaust valve timing control
Output [Engine is running]

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(P/L) (B) magnet retarder (Bank 1)
• Warm-up condition
• Around 2,500 rpm while the
engine speed is rising

JMBIA0034GB

[Engine is running]
BATTERY VOLTAGE
• Warm-up condition
(11 - 14 V)
• Idle speed

7 - 12 V
80 112 Exhaust valve timing control
Output [Engine is running]
(SB) (B) magnet retarder (Bank 2)
• Warm-up condition
• Around 2,500 rpm while the
engine speed is rising

JMBIA0034GB

[Ignition switch: ON]

• Engine stopped
0.5 - 1.0 V
• Accelerator pedal: Fully re-
81 84 Accelerator pedal position leased
Input
(W) (B) sensor 1 [Ignition switch: ON]
• Engine stopped
4.2 - 4.8 V
• Accelerator pedal: Fully de-
pressed
[Ignition switch: ON]
• Engine stopped
0.25 - 0.5 V
• Accelerator pedal: Fully re-
82 100 Accelerator pedal position leased
Input
(O) (G) sensor 2 [Ignition switch: ON]
• Engine stopped
2.0 - 2.5 V
• Accelerator pedal: Fully de-
pressed
Sensor power supply
83 84
(Accelerator pedal position — [Ignition switch: ON] 5V
(GR) (B)
sensor 1)
Sensor ground
84
— (Accelerator pedal position — — —
(B)
sensor 1)

Revision: August 2013 EC-536 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value A
Input/ Condition
+ -– Signal name (Approx.)
Output
[Ignition switch: ON]
4V EC
• ASCD steering switch: OFF
[Ignition switch: ON]
0V
• MAIN switch: Pressed
[Ignition switch: ON] C
85 92 1V
ASCD steering switch Input • CANCEL switch: Pressed
(Y) (BR)
[Ignition switch: ON]
• RESUME/ACCELERATE 3V D
switch: Pressed
[Ignition switch: ON]
2V
• SET/COAST switch: Pressed E
86 96 EVAP control system pres-
Input [Ignition switch: ON] 1.8 - 4.8 V
(SB) (GR) sure sensor

87 100
Sensor power supply F
(Accelerator pedal position — [Ignition switch: ON] 5V
(BR) (G)
sensor 2)

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88 Input/
— Data link connector — — G
(O) Output
Sensor power supply
91 96
(EVAP control system pres- — [Ignition switch: ON] 5V
(V) (GR) H
sure sensor)
92 Sensor ground
— — — —
(BR) (ASCD steering switch)
[Ignition switch: OFF] 0V
I
93 112
Ignition switch Input BATTERY VOLTAGE
(Y) (B) [Ignition switch: ON]
(11 - 14 V)
J
1V
[Engine is running]
• Warm-up condition
• Idle speed K
NOTE:
The pulse cycle changes de-
pending on rpm at idle
L
94 112 JMBIA0076GB
Engine speed output signal Output
(GR) (B)
1V
M

[Engine is running]
• Engine speed: 2,000 rpm
N

JMBIA0077GB

0 - 4.8 V O
95 104
Fuel tank temperature sensor Input [Engine is running] Output voltage varies with fuel tank
(Y) (P)
temperature.
Sensor ground P
96
— (EVAP control system pres- — — —
(GR)
sure sensor)
97 Input/
— CAN communication line — —
(P) Output
98 Input/
— CAN communication line — —
(L) Output

Revision: August 2013 EC-537 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Terminal No. Description
Value
Input/ Condition
+ -– Signal name (Approx.)
Output
Sensor ground
100
— (Accelerator pedal position — — —
(G)
sensor 2)
[Ignition switch: ON] BATTERY VOLTAGE
102 112 • Selector lever: P or N (11 - 14 V)
PNP signal Input
(R) (B) [Ignition switch: ON]
0V
• Selector lever: Except above
Sensor ground
104
— (Fuel tank temperature sen- — — —
(P)
sor)
105 112 BATTERY VOLTAGE
Power supply for ECM Input [Ignition switch: ON]
(V) (B) (11 - 14 V)
[Ignition switch: OFF]
0V
• Brake pedal: Fully released
106 112
Stop lamp switch Input [Ignition switch: OFF]
(SB) (B) BATTERY VOLTAGE
• Brake pedal: Slightly de-
(11 - 14 V)

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pressed
107
(B)
— ECM ground — — —
108
(B)
109 112 EVAP canister vent control BATTERY VOLTAGE
Output [Ignition switch: ON]
(W) (B) valve (11 - 14 V)
[Ignition switch: ON]
• Brake pedal: Slightly de- 0V
110 112 pressed
ASCD brake switch Input
(G) (B)
[Ignition switch: ON] BATTERY VOLTAGE
• Brake pedal: Fully released (11 - 14 V)
111
(B)
— ECM ground — — —
112
(B)

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
*1: This may vary depending on internal resistance of the tester.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to PG-2, "How to Handle Battery".

Fail safe INFOID:0000000010095242

NON DTC RELATED ITEM

Engine operating condi- Reference

Detected items Remarks
tion in fail-safe mode page
Engine speed will not Malfunction indicator When there is an open circuit on MIL circuit, the ECM cannot warn the
rise more than 2,500 rpm lamp circuit driver by illuminating MIL when there is malfunction on engine control
due to the fuel cut system.
Therefore, when electrical controlled throttle and part of ECM related
diagnoses are continuously detected as NG for 5 trips, ECM warns the EC-507
driver that engine control system malfunctions and MIL circuit is open
by means of operating the fail-safe function.
The fail-safe function also operates when above diagnoses except MIL
circuit are detected and demands the driver to repair the malfunction.

DTC RELATED ITEM

Revision: August 2013 EC-538 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

DTC No. Detected items Engine operating condition in fail-safe mode A

P0011 Intake valve timing control The signal is not energized to the intake valve timing control solenoid valve and the valve
P0021 control does not function.
P0014 Exhaust valve timing con- The signal is not energized to the exhaust valve timing control solenoid valve and the EC
P0024 trol magnet retarder control does not function.
P0101 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0102 C
P0103
P0117 Engine coolant tempera- Engine coolant temperature will be determined by ECM based on the following condition.
P0118 ture sensor circuit CONSULT displays the engine coolant temperature decided by ECM.
D
Engine coolant temperature decided
Condition
(CONSULT display)
Just as ignition switch is turned ON
40°C (104°F) E
or START
Approx 4 minutes or more after en-
80°C (176°F)
gine starting
F
40 - 80°C (104 - 176°F)
Except as shown above
(Depends on the time)

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When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running. G
P0122 Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in
P0123 order for the idle position to be within +10 degrees.
P0222 The ECM regulates the opening speed of the throttle valve to be slower than the normal H
P0223 condition.
P2135 Therefore, the acceleration will be poor.
P0196 Engine oil temperature Intake valve timing control does not function. I
P0197 sensor
P0198
P0500 Vehicle speed sensor The cooling fan operates (Highest) while engine is running.
J
P0605 ECM (When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation. K
P0643 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1805 Brake switch ECM controls the electric throttle control actuator by regulating the throttle opening to a L
small range.
Therefore, acceleration will be poor.
Vehicle condition Driving condition M
When engine is idling Normal
When accelerating Poor acceleration
N
P2100 Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
P2103 fixed opening (approx. 5 degrees) by the return spring.
P2101 Electric throttle control ECM stops the electric throttle control actuator control, throttle valve is maintained at a
function fixed opening (approx. 5 degrees) by the return spring. O
P2118 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P

Revision: August 2013 EC-539 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
DTC No. Detected items Engine operating condition in fail-safe mode
P2119 Electric throttle control ac- (When electric throttle control actuator does not function properly due to the return spring
tuator malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is being driven, it slows down gradually because of fuel cut. After the
vehicle stops, the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.
P2122 Accelerator pedal position The ECM controls the electric throttle control actuator in regulating the throttle opening in
P2123 sensor order for the idle position to be within +10 degrees.
P2127 The ECM regulates the opening speed of the throttle valve to be slower than the normal
P2128 condition.
P2138 Therefore, the acceleration will be poor.

DTC Inspection Priority Chart INFOID:0000000010095243

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If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

Revision: August 2013 EC-540 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

Priority Detected items (DTC) A

1 • U0100 U0101 U1001 CAN communication line
• P0101 P0102 P0103 Mass air flow sensor
• P0112 P0113 P0127 Intake air temperature sensor
EC
• P0116 P0117 P0118 P0125 Engine coolant temperature sensor
• P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
• P0128 Thermostat function
• P0181 P0182 P0183 Fuel tank temperature sensor C
• P0196 P0197 P0198 Engine oil temperature sensor
• P0327 P0328 P0332 P0333 Knock sensor
• P0335 Crankshaft position sensor (POS)
• P0340 P0345 Camshaft position sensor (PHASE) D
• P0460 P0461 P0462 P0463 Fuel level sensor
• P0500 Vehicle speed sensor
• P0605 P0607 ECM
• P0643 Sensor power supply E
• P0705 Transmission range switch
• P0850 Park/Neutral position (PNP) switch
• P1550 P1551 P1552 P1553 P1554 Battery current sensor
• P1610 - P1615 NATS F
• P1700 CVT control system
• P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

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2 • P0031 P0032 P0051 P0052 Air fuel ratio (A/F) sensor 1 heater G
• P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
• P0075 P0081 Intake valve timing control solenoid valve
• P0078 P0084 Exhaust valve timing control magnet retarder
• P0130 P0131 P0132 P014C P014D P014E P014F P0150 P0151 P0152 P015A P015B P015C P015D P2096 P2097 P2098 H
P2099 Air fuel ratio (A/F) sensor 1
• P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
• P0441 EVAP control system purge flow monitoring
• P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
I
• P0447 P0448 EVAP canister vent control valve
• P0451 P0452 P0453 EVAP control system pressure sensor
• P0550 Power steering pressure sensor J
• P0603 ECM power supply
• P0710 P0715 P0720 P0740 P0744 P0745 P0746 P0776 P0778 P0840 P0845 P1740 CVT related sensors, solenoid valves
and switches
• P1078 P1084 Exhaust valve timing control position sensor K
• P1217 Engine over temperature (OVERHEAT)
• P1720 Vehicle speed sensor
• P1777 P1778 CVT step motor
• P1800 P1801 VIAS control solenoid valve L
• P1805 Brake switch
• P2100 P2103 Throttle control motor relay
• P2101 Electric throttle control function
• P2118 Throttle control motor M
3 • P0011 P0021 Intake valve timing control
• P0014 P0024 Exhaust valve timing control
• P0171 P0172 P0174 P0175 Fuel injection system function N
• P0300 - P0306 Misfire
• P0420 P0430 Three way catalyst function
• P0442 P0456 EVAP control system (SMALL LEAKAGE, VERY SMALL LEAKAGE)
• P0455 EVAP control system (GROSS LEAKAGE) O
• P0506 P0507 Idle speed control system
• P050E Cold start control
• P1148 P1168 Closed loop control
• P1211 TCS control unit P
• P1212 TCS communication line
• P1421 Cold start control
• P1564 ASCD steering switch
• P1572 ASCD brake switch
• P1574 ASCD vehicle speed sensor
• P1715 Input speed sensor
• P2119 Electric throttle control actuator

Revision: August 2013 EC-541 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
DTC Index INFOID:0000000010095244

×:Applicable —: Not applicable

DTC*1
Items Permanent Refer-
CONSULT SRT code Trip MIL
ECM*3
(CONSULT screen terms) DTC group*4 ence page
GST*2
U0100 0100*5 LOST COMM (ECM A) — 1 × B TM-42

U0101 0101*5 LOST COMM (ECM) — 1 × B EC-160

U1001 1001*5 CAN COMM CIRCUIT — 2 — — EC-161

NO DTC IS DETECTED.
P0000 0000 FURTHER TESTING — — Flashing*8 — —
MAY BE REQUIRED.
P0011 0011 INT/V TIM CONT-B1 × 2 × B EC-162
P0014 0014 EXH/V TIM CONT-B1 × 2 × B EC-166
P0021 0021 INT/V TIM CONT-B2 × 2 × B EC-162
P0024 0024 EXH/V TIM CONT-B2 × 2 × B EC-166
P0031 0031 A/F SEN1 HTR (B1) — 2 × B EC-170

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P0032 0032 A/F SEN1 HTR (B1) — 2 × B EC-170
P0037 0037 HO2S2 HTR (B1) — 2 × B EC-173
P0038 0038 HO2S2 HTR (B1) — 2 × B EC-173
P0051 0051 A/F SEN1 HTR (B2) — 2 × B EC-170
P0052 0052 A/F SEN1 HTR (B2) — 2 × B EC-170
P0057 0057 HO2S2 HTR (B2) — 2 × B EC-173
P0058 0058 HO2S2 HTR (B2) — 2 × B EC-173
P0075 0075 INT/V TIM V/CIR-B1 — 2 × B EC-177
P0078 0078 EX V/T ACT/CIRC-B1 — 2 × B EC-180
P0081 0081 INT/V TIM V/CIR-B2 — 2 × B EC-177
P0084 0084 EX V/T ACT/CIRC-B2 — 2 × B EC-180
P0101 0101 MAF SEN/CIRCUIT-B1 — 2 × B EC-183
P0102 0102 MAF SEN/CIRCUIT-B1 — 1 × B EC-189
P0103 0103 MAF SEN/CIRCUIT-B1 — 1 × B EC-189
P0111 0111 IAT SENSOR 1 B1 — 2 × A EC-195
P0112 0112 IAT SEN/CIRCUIT-B1 — 2 × B EC-198
P0113 0113 IAT SEN/CIRCUIT-B1 — 2 × B EC-198
P0116 0116 ECT SEN/CIRC — 2 × A EC-201
P0117 0117 ECT SEN/CIRC — 1 × B EC-204
P0118 0118 ECT SEN/CIRC — 1 × B EC-204
P0122 0122 TP SEN 2/CIRC-B1 — 1 × B EC-207
P0123 0123 TP SEN 2/CIRC-B1 — 1 × B EC-207
P0125 0125 ECT SENSOR — 2 × B EC-210
P0127 0127 IAT SENSOR-B1 — 2 × B EC-213
P0128 0128 THERMSTAT FNCTN — 2 × A EC-215
P0130 0130 A/F SENSOR1 (B1) — 2 × A EC-218
P0131 0131 A/F SENSOR1 (B1) — 2 × B EC-222
P0132 0132 A/F SENSOR1 (B1) — 2 × B EC-226
P0137 0137 HO2S2 (B1) × 2 × A EC-230

Revision: August 2013 EC-542 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

DTC*1
Items Permanent Refer- A
CONSULT SRT code Trip MIL
ECM*3
(CONSULT screen terms) DTC group*4 ence page
GST*2
P0138 0138 HO2S2 (B1) × 2 × A EC-237 EC
P0139 0139 HO2S2 (B1) × 2 × A EC-247
P014C 014C A/F SENSOR1 (B1) × 2 × A
P014D 014D A/F SENSOR1 (B1) × 2 × A C
EC-255
P014E 014E A/F SENSOR1 (B2) × 2 × A
P014F 014F A/F SENSOR1 (B2) × 2 × A
D
P0150 0150 A/F SENSOR1 (B2) — 2 × A EC-218
P0151 0151 A/F SENSOR1 (B2) — 2 × B EC-222
P0152 0152 A/F SENSOR1 (B2) — 2 × B EC-226 E
P0157 0157 HO2S2 (B2) × 2 × A EC-230
P0158 0158 HO2S2 (B2) × 2 × A EC-237
F
P0159 0159 HO2S2 (B2) × 2 × A EC-247
P015A 015A A/F SENSOR1 (B1) × 2 × A

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P015B 015B A/F SENSOR1 (B1) × 2 × A G
EC-255
P015C 015C A/F SENSOR1 (B2) × 2 × A
P015D 015D A/F SENSOR1 (B2) × 2 × A
H
P0171 0171 FUEL SYS-LEAN-B1 — 2 × B EC-261
P0172 0172 FUEL SYS-RICH-B1 — 2 × B EC-265
P0174 0174 FUEL SYS-LEAN-B2 — 2 × B EC-261 I
P0175 0175 FUEL SYS-RICH-B2 — 2 × B EC-265
P0181 0181 FTT SENSOR — 2 × A and B EC-269
P0182 0182 FTT SEN/CIRCUIT — 2 × B EC-274 J
P0183 0183 FTT SEN/CIRCUIT — 2 × B EC-274
P0196 0196 EOT SEN/CIRC — 2 × A and B EC-277
K
P0197 0197 EOT SEN/CIRC — 2 × B EC-281
P0198 0198 EOT SEN/CIRC — 2 × B EC-281
P0222 0222 TP SEN 1/CIRC-B1 — 1 × B EC-284 L
P0223 0223 TP SEN 1/CIRC-B1 — 1 × B EC-284
P0300 0300 MULTI CYL MISFIRE — 1or2 × B EC-287
M
P0301 0301 CYL 1 MISFIRE — 1or2 × B EC-287
P0302 0302 CYL 2 MISFIRE — 1or2 × B EC-287
P0303 0303 CYL 3 MISFIRE — 1or2 × B EC-287 N
P0304 0304 CYL 4 MISFIRE — 1or2 × B EC-287
P0305 0305 CYL 5 MISFIRE — 1or2 × B EC-287
O
P0306 0306 CYL 6 MISFIRE — 1or2 × B EC-287
P0327 0327 KNOCK SEN/CIRC-B1 — 2 — — EC-293
P0328 0328 KNOCK SEN/CIRC-B1 — 2 — — EC-293 P
P0332 0332 KNOCK SEN/CIRC-B2 — 2 — — EC-293
P0333 0333 KNOCK SEN/CIRC-B2 — 2 — — EC-293
P0335 0335 CKP SEN/CIRCUIT — 2 × B EC-296
P0340 0340 CMP SEN/CIRC-B1 — 2 × B EC-300
P0345 0345 CMP SEN/CIRC-B2 — 2 × B EC-300

Revision: August 2013 EC-543 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

DTC*1
Items Permanent Refer-
CONSULT SRT code Trip MIL
ECM*3
(CONSULT screen terms) DTC group*4 ence page
GST*2
P0420 0420 TW CATALYST SYS-B1 × 2 × A EC-304
P0430 0430 TW CATALYST SYS-B2 × 2 × A EC-304
P0441 0441 EVAP PURG FLOW/MON × 2 × A EC-310
P0442 0442 EVAP SMALL LEAKAGE × 2 × A EC-316
P0443 0443 PURG VOLUME CONT/V — 2 × A EC-323
P0444 0444 PURG VOLUME CONT/V — 2 × B EC-329
P0445 0445 PURG VOLUME CONT/V — 2 × B EC-329
P0447 0447 VENT CONTROL VALVE — 2 × B EC-333
P0448 0448 VENT CONTROL VALVE — 2 × B EC-338
P0451 0451 EVAP SYS PRES SEN — 2 × B EC-343
P0452 0452 EVAP SYS PRES SEN — 2 × B EC-347
P0453 0453 EVAP SYS PRES SEN — 2 × B EC-352
P0455 0455 EVAP GROSS LEAKAGE — 2 × A EC-358

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EVAP VERY SML LEAK-
P0456 0456 ×*7 2 × A EC-364
AGE
P0460 0460 FUEL LEV SEN SLOSH — 2 × A EC-372
P0461 0461 FUEL LEVEL SENSOR — 2 × B EC-374
P0462 0462 FUEL LEVL SEN/CIRC — 2 × B EC-376
P0463 0463 FUEL LEVL SEN/CIRC — 2 × B EC-376
P0500 0500 VEH SPEED SEN/CIRC*6 — 2 × B EC-378
P0506 0506 ISC SYSTEM — 2 × B EC-380
P0507 0507 ISC SYSTEM — 2 × B EC-382
P050A 050A COLD START CONTROL — 2 × A EC-384
P050E 050E COLD START CONTROL — 2 × A EC-384
P0550 0550 PW ST P SEN/CIRC — 2 — — EC-386
P0603 0603 ECM BACK UP/CIRCUIT — 2 × or — B EC-389
P0605 0605 ECM — 1 or 2 × or — B EC-391
P0607 0607 ECM — 1 or 2 × or — B EC-393
P0643 0643 SENSOR POWER/CIRC — 1 × B EC-394
P0705 0705 T/M RANGE SENSOR A — 2 × B TM-50
FLUID TEMP SENSOR
P0710 0710 — 1 × B TM-53
A*9
INPUT SPEED SENSOR
P0715 0715 — 2 × B TM-57
A
OUTPUT SPEED SEN-
P0720 0720 — 2 × B TM-60
SOR*6
P0740 0740 TORQUE CONVERTER — 2 × B TM-67
P0744 0744 TORQUE CONVERTER — 2 × B TM-69
P0745 0745 PC SOLENOID A — 2 × B TM-71
P0746 0746 PC SOLENOID A — 1 × B TM-73
P0776 0776 PC SOLENOID B — 2 × B TM-75
P0778 0778 PC SOLENOID B — 2 × B TM-77
P0840 0840 FLUID PRESS SEN/SW A — 2 × B TM-85

Revision: August 2013 EC-544 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

DTC*1
Items Permanent Refer- A
CONSULT SRT code Trip MIL
ECM*3
(CONSULT screen terms) DTC group*4 ence page
GST*2
P0845 0845 FLUID PRESS SEN/SW B — 2 × B TM-90 EC
P0850 0850 P-N POS SW/CIRCUIT — 2 × B EC-397
P1078 1078 EXH TIM SEN/CIRC-B1 — 2 × B EC-400
P1084 1084 EXH TIM SEN/CIRC-B2 — 2 × B EC-400 C
P1148 1148 CLOSED LOOP-B1 — 1 × A EC-403
P1168 1168 CLOSED LOOP-B2 — 1 × A EC-403
D
P1211 1211 TCS C/U FUNCTN — 2 — — EC-404
P1212 1212 TCS/CIRC — 2 — — EC-405
P1217 1217 ENG OVER TEMP — 1 × B EC-406 E
P1225 1225 CTP LEARNING-B1 — 2 — — EC-410
P1226 1226 CTP LEARNING-B1 — 2 — — EC-412
F
P1550 1550 BAT CURRENT SENSOR — 2 — — EC-414
P1551 1551 BAT CURRENT SENSOR — 2 — — EC-417

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P1552 1552 BAT CURRENT SENSOR — 2 — — EC-417 G
P1553 1553 BAT CURRENT SENSOR — 2 — — EC-420
P1554 1554 BAT CURRENT SENSOR — 2 — — EC-423
H
P1564 1564 ASCD SW — 1 — — EC-426
P1572 1572 ASCD BRAKE SW — 1 — — EC-429
P1574 1574 ASCD VHL SPD SEN — 1 — — EC-435 I
P1610 1610 LOCK MODE — 2 — — SEC-31
P1611 1611 ID DISCORD IMM-ECM — 2 — — SEC-34
P1612 1612 CHAIN OF ECM-IMMU — 2 — — SEC-35 J
P1615 1615 DIFFERENCE OF KEY — 2 — — SEC-36
P1700 1700 CVT C/U FUNCT — 1 — — EC-437
K
P1715 1715 IN PULY SPEED — 2 — — EC-438
P1720 1720 V/SP SEN(A/T OUT) — 2 — — EC-440
P1740 1740 SLCT SOLENOID — 2 × B TM-106 L
P1777 1777 STEP MOTOR — 1 × B TM-109
P1778 1778 STEP MOTOR — 2 × B TM-112
M
P1800 1800 VIAS S/V-1 — 2 — — EC-442
P1801 1801 VIAS S/V-2 — 2 — — EC-445
P1805 1805 BRAKE SW/CIRCUIT — 2 — — EC-448 N
POST CAT FUEL TRIM
P2096 2096 — 2 × A EC-451
SYS B1
POST CAT FUEL TRIM O
P2097 2097 — 2 × A EC-451
SYS B1
POST CAT FUEL TRIM
P2098 2098 — 2 × A EC-451
SYS B2 P
POST CAT FUEL TRIM
P2099 2099 — 2 × A EC-451
SYS B2
P2100 2100 ETC MOT PWR-B1 — 1 × B EC-456
P2101 2101 ETC FNCTN/CIRC-B1 — 1 × B EC-458
P2103 2103 ETC MOT PWR — 1 × B EC-456
P2118 2118 ETC MOT-B1 — 1 × B EC-462

Revision: August 2013 EC-545 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

DTC*1
Items Permanent Refer-
CONSULT SRT code Trip MIL
ECM*3
(CONSULT screen terms) DTC group*4 ence page
GST*2
P2119 2119 ETC ACTR-B1 — 1 × B EC-465
P2122 2122 APP SEN 1/CIRC — 1 × B EC-467
P2123 2123 APP SEN 1/CIRC — 1 × B EC-467
P2127 2127 APP SEN 2/CIRC — 1 × B EC-470
P2128 2128 APP SEN 2/CIRC — 1 × B EC-470
P2135 2135 TP SENSOR-B1 — 1 × B EC-474
P2138 2138 APP SENSOR — 1 × B EC-477
*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012/ISO 15031-6.
*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: Refer to EC-31, "Description", “HOW TO ERASE PERMANENT DTC”.
*5: The troubleshooting for this DTC needs CONSULT.
*6: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.
*7: SRT code will not be set if the self-diagnostic result is NG.

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*8: When the ECM is in the mode that displays SRT status, MIL may flash. For the details, refer to “How to Display SRT Status”.
*9: When erasing this DTC, always use CONSULT or GST.

Test Value and Test Limit INFOID:0000000010103166

The following is the information specified in Service $06 of SAE J1979/ISO 15031-5.
The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
These data (test value and test limit) are specified by On Board Monitor ID (OBDMID), Test ID (TID), Unit and
Scaling ID and can be displayed on the GST screen.
The items of the test value and test limit will be displayed with GST screen which items are provided by the
ECM. (e.g., if bank 2 is not applied on this vehicle, only the items of bank 1 are displayed)

Revision: August 2013 EC-546 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]

Test value and Test A

limit
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
EC
TID Scaling
ID
Minimum sensor output voltage for test
P0131 83H 0BH C
cycle
Maximum sensor output voltage for
P0131 84H 0BH
test cycle
Minimum sensor output voltage for test D
P0130 85H 0BH
cycle
Maximum sensor output voltage for
P0130 86H 0BH
test cycle E
Response rate: Response ratio (lean
P0133 87H 04H
to rich)
Response rate: Response ratio (rich to F
P0133 88H 04H
lean)
The amount of shift in air fuel ratio (too

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P2A00 or P2096 89H 84H
lean) G
The amount of shift in air fuel ratio (too
P2A00 or P2097 8AH 84H
rich)
P0130 8BH 0BH Difference in sensor output voltage H
P0133 8CH 83H Response gain at the limited frequency
Air fuel ratio (A/F) sensor 1 O2 sensor slow response - Rich to
HO2S 01H P014C 8DH 04H
(Bank 1) lean bank 1 sensor 1 I
O2 sensor slow response - Rich to
P014C 8EH 04H
lean bank 1 sensor 1
O2 sensor slow response - Lean to rich
J
P014D 8FH 84H
bank 1 sensor 1
O2 sensor slow response - Lean to rich
P014D 90H 84H
bank 1 sensor 1 K
O2 sensor delayed response - Rich to
P015A 91H 01H
lean bank 1 sensor 1
O2 sensor delayed response - Rich to L
P015A 92H 01H
lean bank 1 sensor 1
O2 sensor delayed response - Lean to
P015B 93H 01H
rich bank 1 sensor 1 M
O2 sensor delayed response - Lean to
P015B 94H 01H
rich bank 1 sensor 1
Response rate: Response ratio (lean N
P0133 95H 04H
to rich)
Response rate: Response ratio (rich to
P0133 96H 84H
lean) O

Revision: August 2013 EC-547 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Test value and Test
limit
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
TID Scaling
ID
Minimum sensor output voltage for test
P0138 07H 0CH
cycle
Maximum sensor output voltage for
P0137 08H 0CH
test cycle
Heated oxygen sensor 2
02H
(Bank 1) P0138 80H 0CH Sensor output voltage
P0139 81H 0CH Difference in sensor output voltage
Rear O2 sensor delay response diag-
P0139 82H 11H
nosis
Minimum sensor output voltage for test
P0143 07H 0CH
cycle

Heated oxygen sensor 3 Maximum sensor output voltage for

03H P0144 08H 0CH
(Bank 1) test cycle
P0146 80H 0CH Sensor output voltage

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P0145 81H 0CH Difference in sensor output voltage
Minimum sensor output voltage for test
P0151 83H 0BH
cycle
Maximum sensor output voltage for
P0151 84H 0BH
test cycle
Minimum sensor output voltage for test
P0150 85H 0BH
cycle
Maximum sensor output voltage for
P0150 86H 0BH
test cycle

HO2S Response rate: Response ratio (lean

P0153 87H 04H
to rich)
Response rate: Response ratio (rich to
P0153 88H 04H
lean)
The amount of shift in air fuel ratio (too
P2A03 or P2098 89H 84H
lean)
The amount of shift in air fuel ratio (too
P2A03 or P2099 8AH 84H
rich)
Air fuel ratio (A/F) sensor 1
05H
(Bank 2) P0150 8BH 0BH Difference in sensor output voltage
P0153 8CH 83H Response gain at the limited frequency
O2 sensor slow response - Rich to
P014E 8DH 04H
lean bank 2 sensor 1
O2 sensor slow response - Rich to
P014E 8EH 04H
lean bank 2 sensor 1
O2 sensor slow response - Lean to rich
P014F 8FH 84H
bank 2 sensor 1
O2 sensor slow response - Lean to rich
P014F 90H 84H
bank 2 sensor 1
O2 sensor delayed response - Rich to
P015C 91H 01H
lean bank 2 sensor 1
O2 sensor delayed response - Rich to
P015C 92H 01H
lean bank 2 sensor 1
O2 sensor delayed response - Lean to
P015D 93H 01H
rich bank 2 sensor 1

Revision: August 2013 EC-548 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Test value and Test
limit A
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
TID Scaling EC
ID
O2 sensor delayed response - Lean to
P015D 94H 01H
rich bank 2 sensor 1
C
Air fuel ratio (A/F) sensor 1 Response rate: Response ratio (lean
05H P0153 95H 04H
(Bank 2) to rich)
Response rate: Response ratio (rich to D
P0153 96H 84H
lean)
Minimum sensor output voltage for test
P0158 07H 0CH
cycle
E
Maximum sensor output voltage for
P0157 08H 0CH
test cycle
Heated oxygen sensor 2
HO2S 06H
(Bank 2) P0158 80H 0CH Sensor output voltage
F
P0159 81H 0CH Difference in sensor output voltage
Rear O2 sensor delay response diag-

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P0159 82H 11H
nosis
G
Minimum sensor output voltage for test
P0163 07H 0CH
cycle

Heated oxygen sensor 3 Maximum sensor output voltage for H

07H P0164 08H 0CH
(Bank2) test cycle
P0166 80H 0CH Sensor output voltage
P0165 81H 0CH Difference in sensor output voltage I
P0420 80H 01H O2 storage index
Switching time lag engine exhaust in-
P0420 82H 01H J
Three way catalyst function dex value
21H
(Bank1) Difference in 3rd O2 sensor output
P2423 83H 0CH
voltage
P2423 84H 84H O2 storage index in HC trap catalyst K
CATA-
LYST P0430 80H 01H O2 storage index
Switching time lag engine exhaust in-
P0430 82H 01H L
Three way catalyst function dex value
22H
(Bank2) Difference in 3rd O2 sensor output
P2424 83H 0CH
voltage
M
P2424 84H 84H O2 storage index in HC trap catalyst
Low flow faults: EGR temp change rate
P0400 80H 96H
(short term)
N
Low flow faults: EGR temp change rate
P0400 81H 96H
(long term)
EGR Low flow faults: Difference between
SYSTEM
31H EGR function
P0400 82H 96H max EGR temp and EGR temp under
O
idling condition
P0400 83H 96H Low flow faults: Max EGR temp
P
High Flow Faults: EGR temp increase
P1402 84H 96H
rate

Revision: August 2013 EC-549 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Test value and Test
limit
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
TID Scaling
ID
VTC intake function diagnosis (VTC
P0011 80H 9DH
alignment check diagnosis)
VTC exhaust function diagnosis (VTC
P0014 81H 9DH
alignment check diagnosis)
VTC intake function diagnosis (VTC
P0011 82H 9DH
drive failure diagnosis)
VTC exhaust function diagnosis (VTC
P0014 83H 9DH
drive failure diagnosis)
35H VVT Monitor (Bank1)
P100A 84H 10H VEL slow response diagnosis
P1090 85H 10H VEL servo system diagnosis
VTC intake intermediate lock function
P0011 86H 9DH diagnosis (VTC intermediate position
alignment check diagnosis)

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VTC intake intermediate lock system
Advanced: P052A
87H 9DH diagnosis (VTC intermediate lock posi-
Retarded: P052B
VVT tion check diagnosis)
SYSTEM VTC intake function diagnosis (VTC
P0021 80H 9DH
alignment check diagnosis)
VTC exhaust function diagnosis (VTC
P0024 81H 9DH
alignment check diagnosis)
VTC intake function diagnosis (VTC
P0021 82H 9DH
drive failure diagnosis)
VTC exhaust function diagnosis (VTC
P0024 83H 9DH
drive failure diagnosis)
36H VVT Monitor (Bank2)
P100B 84H 10H VEL slow response diagnosis
P1093 85H 10H VEL servo system diagnosis
VTC intake intermediate lock function
P0021 86H 9DH diagnosis (VTC intermediate position
alignment check diagnosis)
VTC intake intermediate lock system
Advanced: P052C
87H 9DH diagnosis (VTC intermediate lock posi-
Retarded: P052D
tion check diagnosis)
EVAP control system leak Difference in pressure sensor output
39H P0455 80H 0CH
(Cap Off) voltage before and after pull down
EVAP control system leak Leak area index (for more than 0.04
3BH P0442 80H 05H
(Small leak) inch)
Leak area index (for more than 0.02
P0456 80H 05H
inch)
EVAP
SYSTEM EVAP control system leak Maximum internal pressure of EVAP
3CH P0456 81H FDH
(Very small leak) system during monitoring
Internal pressure of EVAP system at
P0456 82H FDH
the end of monitoring
Difference in pressure sensor output
3DH Purge flow system P0441 83H 0CH voltage before and after vent control
valve close

Revision: August 2013 EC-550 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Test value and Test
limit A
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
TID Scaling EC
ID
Low Input: P0031 Converted value of heater electric cur-
41H A/F sensor 1 heater (Bank 1) 81H 0BH
High Input: P0032 rent to voltage
C
Heated oxygen sensor 2 heat- Low Input: P0037 Converted value of heater electric cur-
42H 80H 0CH
er (Bank 1) High Input: P0038 rent to voltage
Heated oxygen sensor 3 heat- Converted value of heater electric cur- D
O2 SEN- 43H P0043 80H 0CH
er (Bank 1) rent to voltage
SOR
HEATER Low Input: P0051 Converted value of heater electric cur-
45H A/F sensor 1 heater (Bank 2) 81H 0BH
High Input: P0052 rent to voltage
E
Heated oxygen sensor 2 heat- Low Input: P0057 Converted value of heater electric cur-
46H 80H 0CH
er (Bank 2) High Input: P0058 rent to voltage
Heated oxygen sensor 3 heat- Converted value of heater electric cur-
47H
er (Bank 2)
P0063 80H 0CH
rent to voltage
F
Secondary air injection system incor-
P0411 80H 01H

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rect flow detected
G
Bank1: P0491 Secondary air injection system insuffi-
81H 01H
Bank2: P0492 cient flow
Secondary air injection system pump
P2445 82H 01H H
stuck off
SEC-
Secondary air injection system high
OND- 71H Secondary air system P2448 83H 01H
airflow
ARY AIR
Bank1: P2440 Secondary air injection system switch-
I
84H 01H
Bank2: P2442 ing valve stuck open
Secondary air injection system switch-
P2440 85H 01H J
ing valve stuck open
Secondary air injection system pump
P2444 86H 01H
stuck on
P0171 or P0172 80H 2FH Long term fuel trim K
Fuel injection system function The number of lambda control
81H P0171 or P0172 81H 24H
(Bank 1) clamped
L
FUEL P117A 82H 03H Cylinder A/F imbalance monitoring
SYSTEM P0174 or P0175 80H 2FH Long term fuel trim
Fuel injection system function The number of lambda control M
82H P0174 or P0175 81H 24H
(Bank 2) clamped
P117B 82H 03H Cylinder A/F imbalance monitoring

Revision: August 2013 EC-551 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Test value and Test
limit
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
TID Scaling
ID
Misfiring counter at 1000 revolution of
P0301 80H 24H
the first cylinder
Misfiring counter at 1000 revolution of
P0302 81H 24H
the second cylinder
Misfiring counter at 1000 revolution of
P0303 82H 24H
the third cylinder
Misfiring counter at 1000 revolution of
P0304 83H 24H
the fourth cylinder
Misfiring counter at 1000 revolution of
P0305 84H 24H
the fifth cylinder
Misfiring counter at 1000 revolution of
P0306 85H 24H
the sixth cylinder
Misfiring counter at 1000 revolution of
P0307 86H 24H

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the seventh cylinder
Misfiring counter at 1000 revolution of
P0308 87H 24H
the eighth cylinder
Misfiring counter at 1000 revolution of
P0300 88H 24H
the multiple cylinders
Misfiring counter at 200 revolution of
P0301 89H 24H
the first cylinder
MISFIRE A1H Multiple cylinder misfires
Misfiring counter at 200 revolution of
P0302 8AH 24H
the second cylinder
Misfiring counter at 200 revolution of
P0303 8BH 24H
the third cylinder
Misfiring counter at 200 revolution of
P0304 8CH 24H
the fourth cylinder
Misfiring counter at 200 revolution of
P0305 8DH 24H
the fifth cylinder
Misfiring counter at 200 revolution of
P0306 8EH 24H
the sixth cylinder
Misfiring counter at 200 revolution of
P0307 8FH 24H
the seventh cylinder
Misfiring counter at 200 revolution of
P0308 90H 24H
the eighth cylinder
Misfiring counter at 1000 revolution of
P0300 91H 24H
the single cylinder
Misfiring counter at 200 revolution of
P0300 92H 24H
the single cylinder
Misfiring counter at 200 revolution of
P0300 93H 24H
the multiple cylinders

Revision: August 2013 EC-552 2014 Maxima NAM

 ECM
< ECU DIAGNOSIS INFORMATION > [VQ35DE]
Test value and Test
limit A
OBD- (GST display)
Item Self-diagnostic test item DTC Description
MID Unit and
TID Scaling EC
ID
EWMA (Exponential Weighted Moving
P0301 0BH 24H Average) misfire counts for last 10 driv-
ing cycles
C
A2H No. 1 cylinder misfire
Misfire counts for last/current driving
P0301 0CH 24H
cycles
D
EWMA (Exponential Weighted Moving
P0302 0BH 24H Average) misfire counts for last 10 driv-
A3H No. 2 cylinder misfire ing cycles
Misfire counts for last/current driving E
P0302 0CH 24H
cycles
EWMA (Exponential Weighted Moving
P0303 0BH 24H Average) misfire counts for last 10 driv- F
A4H No. 3 cylinder misfire ing cycles
Misfire counts for last/current driving

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P0303 0CH 24H
cycles G
EWMA (Exponential Weighted Moving
P0304 0BH 24H Average) misfire counts for last 10 driv-
A5H No. 4 cylinder misfire ing cycles
H
Misfire counts for last/current driving
P0304 0CH 24H
cycles
MISFIRE
EWMA (Exponential Weighted Moving
I
P0305 0BH 24H Average) misfire counts for last 10 driv-
A6H No. 5 cylinder misfire ing cycles
Misfire counts for last/current driving
P0305 0CH 24H J
cycles
EWMA (Exponential Weighted Moving
P0306 0BH 24H Average) misfire counts for last 10 driv-
A7H No. 6 cylinder misfire ing cycles K
Misfire counts for last/current driving
P0306 0CH 24H
cycles
EWMA (Exponential Weighted Moving L
P0307 0BH 24H Average) misfire counts for last 10 driv-
A8H No. 7 cylinder misfire ing cycles
Misfire counts for last/current driving M
P0307 0CH 24H
cycles
EWMA (Exponential Weighted Moving
P0308 0BH 24H Average) misfire counts for last 10 driv-
ing cycles
N
A9H No. 8 cylinder misfire
Misfire counts for last/current driving
P0308 0CH 24H
cycles
O

Revision: August 2013 EC-553 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

WIRING DIAGRAM
ENGINE CONTROL SYSTEM
Wiring Diagram INFOID:0000000010095246

cardiagn.com

ABBWA1129GB

Revision: August 2013 EC-554 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

ABBWA1130GB

Revision: August 2013 EC-555 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

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ABBWA1131GB

Revision: August 2013 EC-556 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

ABBWA1132GB

Revision: August 2013 EC-557 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
ABBWA1133GB

Revision: August 2013 EC-558 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

ABBWA1134GB

Revision: August 2013 EC-559 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
ABBWA1135GB

Revision: August 2013 EC-560 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

ABBWA1136GB

Revision: August 2013 EC-561 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

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AABIA0897GB

Revision: August 2013 EC-562 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

ABBIA1835GB

Revision: August 2013 EC-563 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
AABIA0899GB

Revision: August 2013 EC-564 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

AABIA0900GB

Revision: August 2013 EC-565 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
AABIA0901GB

Revision: August 2013 EC-566 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

cardiagn.com
G

ABBIA1836GB

Revision: August 2013 EC-567 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
ABBIA1837GB

Revision: August 2013 EC-568 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

cardiagn.com
G

ABBIA1838GB

Revision: August 2013 EC-569 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
ABBIA1839GB

Revision: August 2013 EC-570 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

AABIA0906GB

Revision: August 2013 EC-571 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
AABIA0907GB

Revision: August 2013 EC-572 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

AABIA0908GB

Revision: August 2013 EC-573 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
AABIA0909GB

Revision: August 2013 EC-574 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

cardiagn.com
G

AABIA0910GB

Revision: August 2013 EC-575 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
AABIA0911GB

Revision: August 2013 EC-576 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

cardiagn.com
G

AABIA0912GB

Revision: August 2013 EC-577 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

cardiagn.com
ABBIA1840GB

Revision: August 2013 EC-578 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

EC

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G

AABIA0914GB

Revision: August 2013 EC-579 2014 Maxima NAM

 ENGINE CONTROL SYSTEM
< WIRING DIAGRAM > [VQ35DE]

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AABIA0915GB

Revision: August 2013 EC-580 2014 Maxima NAM

 ENGINE CONTROL SYSTEM SYMPTOMS
< SYMPTOM DIAGNOSIS > [VQ35DE]

SYMPTOM DIAGNOSIS A
ENGINE CONTROL SYSTEM SYMPTOMS
Symptom Table INFOID:0000000010095247
EC

SYSTEM — BASIC ENGINE CONTROL SYSTEM

C
SYMPTOM

OVERHEATS/WATER TEMPERATURE HIGH

LACK OF POWER/POOR ACCELERATION
D

HARD/NO START/RESTART (EXCP. HA)

BATTERY DEAD (UNDER CHARGE)

HESITATION/SURGING/FLAT SPOT

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

E

SPARK KNOCK/DETONATION

SLOW/NO RETURN TO IDLE

Reference

ROUGH IDLE/HUNTING
page

HIGH IDLE/LOW IDLE

F

IDLING VIBRATION
ENGINE STALL

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G

H
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Fuel Fuel pump circuit 1 1 2 3 2 2 2 3 2 EC-499
Fuel pressure regulator system 3 3 4 4 4 4 4 4 4 4 EC-592 I
Fuel injector circuit 1 1 2 3 2 2 2 2 EC-496
Evaporative emission system 3 3 4 4 4 4 4 4 4 4 EC-94
J
Air Positive crankcase ventilation sys-
4 4 4 4 4 4 4 4 1 EC-514
tem 3 3
Incorrect idle speed adjustment 1 1 1 1 1 EC-14
K
EC-458,
Electric throttle control actuator 1 1 2 3 3 2 2 2 2 2 2
EC-465
Ignition Incorrect ignition timing adjustment 3 3 1 1 1 1 1 1 EC-14
L
Ignition circuit 1 1 2 2 2 2 2 2 EC-502
Power supply and ground circuit 2 2 3 3 3 3 3 2 3 EC-157
EC-183, M
Mass air flow sensor circuit 2
EC-189
1
EC-204,
Engine coolant temperature sensor circuit 3 3
EC-210 N
EC-218,
3 EC-222,
Air fuel ratio (A/F) sensor 1 circuit 1 2 2 2 2 2 EC-226,
EC-255,
O
EC-451
EC-207,
EC-284, P
Throttle position sensor circuit EC-410,
EC-412,
2 2 EC-474
EC-394,
EC-467,
Accelerator pedal position sensor circuit 3 2 1
EC-470,
EC-477

Revision: August 2013 EC-581 2014 Maxima NAM

 ENGINE CONTROL SYSTEM SYMPTOMS
< SYMPTOM DIAGNOSIS > [VQ35DE]
SYMPTOM

OVERHEATS/WATER TEMPERATURE HIGH

LACK OF POWER/POOR ACCELERATION
HARD/NO START/RESTART (EXCP. HA)

BATTERY DEAD (UNDER CHARGE)

HESITATION/SURGING/FLAT SPOT

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

SPARK KNOCK/DETONATION

SLOW/NO RETURN TO IDLE

Reference

ROUGH IDLE/HUNTING
page

HIGH IDLE/LOW IDLE

IDLING VIBRATION
Warranty symptom code AA ENGINE STALL
AB AC AD AE AF AG AH AJ AK AL AM HA
Knock sensor circuit 2 3 EC-293
EC-277,
Engine oil temperature sensor 4 2 3

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EC-281
Crankshaft position sensor (POS) circuit 2 2 EC-296
Camshaft position sensor (PHASE) circuit 3 2 EC-300
Vehicle speed signal circuit 2 3 3 3 EC-378
Power steering pressure sensor circuit 2 3 3 EC-386
EC-389,
ECM 2 2 3 3 3 3 3 3 3 3 3
EC-391
Intake valve timing control solenoid valve cir-
3 2 1 3 2 2 3 3 EC-177
cuit
PNP signal circuit 3 3 3 3 3 EC-397
VIAS control solenoid valve 1 circuit 1 EC-442
VIAS control solenoid valve 2 circuit 1 EC-445
Refrigerant pressure sensor circuit 2 3 3 4 EC-515
Electrical load signal circuit 3 EC-491
HA-17, HA-
Air conditioner circuit 2 2 3 3 3 3 3 3 3 3 2
17
ABS actuator and electric unit (control unit) 4 BRC-4
1 - 6: The numbers refer to the order of inspection.
(continued on next page)

SYSTEM — ENGINE MECHANICAL & OTHER

Revision: August 2013 EC-582 2014 Maxima NAM

 ENGINE CONTROL SYSTEM SYMPTOMS
< SYMPTOM DIAGNOSIS > [VQ35DE]

SYMPTOM A

OVERHEATS/WATER TEMPERATURE HIGH

LACK OF POWER/POOR ACCELERATION
HARD/NO START/RESTART (EXCP. HA)
EC

BATTERY DEAD (UNDER CHARGE)

HESITATION/SURGING/FLAT SPOT

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

SPARK KNOCK/DETONATION

SLOW/NO RETURN TO IDLE

C
Reference

ROUGH IDLE/HUNTING
page

HIGH IDLE/LOW IDLE

IDLING VIBRATION
D

ENGINE STALL
E

Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA F

Fuel Fuel tank FL-10
5
Fuel piping 5 5 5 5 5 5 FL-5

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Vapor lock — G
5
Valve deposit —
Poor fuel (Heavy weight gasoline, 5 5 5 5 5 5 5
— H
Low octane)
Air Air duct EM-25
Air cleaner EM-25 I
Air leakage from air duct
(Mass air flow sensor — electric EM-25
5 5 5 5 5 5
throttle control actuator)
5 5 5 5 J
Electric throttle control actuator EM-25
Air leakage from intake manifold/ EM-25,
Collector/Gasket EM-28
K
Cranking Battery PG-67
1 1 1 1 1 1 1
Generator circuit CHG-29
Starter circuit 3 1 STR-8 L
Signal plate 6 EM-95
PNP signal 4 TM-51
M
Engine Cylinder head
5 5 5 5 5 5 5 5 EM-95
Cylinder head gasket 4 3
Cylinder block N
Piston 4
Piston ring
6 6 6 6 6 6 6 6 EM-107 O
Connecting rod
Bearing
Crankshaft P
Valve Timing chain EM-64
mecha-
Camshaft EM-81
nism
EM-52,
Intake valve timing control 5 5 5 5 5 5 5 5
EM-53
Intake valve
3 EM-95
Exhaust valve

Revision: August 2013 EC-583 2014 Maxima NAM

 ENGINE CONTROL SYSTEM SYMPTOMS
< SYMPTOM DIAGNOSIS > [VQ35DE]
SYMPTOM

OVERHEATS/WATER TEMPERATURE HIGH

LACK OF POWER/POOR ACCELERATION
HARD/NO START/RESTART (EXCP. HA)

BATTERY DEAD (UNDER CHARGE)

HESITATION/SURGING/FLAT SPOT

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

SPARK KNOCK/DETONATION

SLOW/NO RETURN TO IDLE

Reference

ROUGH IDLE/HUNTING
page

HIGH IDLE/LOW IDLE

IDLING VIBRATION
Warranty symptom code AA ENGINE STALL
AB AC AD AE AF AG AH AJ AK AL AM HA
Exhaust Exhaust manifold/Tube/Muffler/
Gasket 5 5 5 5 5 5 5 5 EX-5, EX-4

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Three way catalyst
Lubrica- LU-8, LU-
Oil pan/Oil strainer/Oil pump/Oil
tion 10, LU-12,
filter/Oil gallery/Oil cooler 5 5 5 5 5 5 5 5 LU-15
Oil level (Low)/Filthy oil LU-8
Cooling Radiator/Hose/Radiator filler cap CO-14
Thermostat 5 CO-22
Water pump CO-17
Water gallery 5 5 5 5 5 5 5 4 5 CO-24
Cooling fan CO-16
Coolant level (Low)/Contaminat- 5
CO-10
ed coolant
NVIS (NISSAN Vehicle Immobilizer System —
1 1 SEC-4
NATS)
1 - 6: The numbers refer to the order of inspection.

Revision: August 2013 EC-584 2014 Maxima NAM

 NORMAL OPERATING CONDITION
< SYMPTOM DIAGNOSIS > [VQ35DE]
NORMAL OPERATING CONDITION
A
Description INFOID:0000000010095248

FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED) EC

If the engine speed is above 2,000 rpm under no load (for example, the selector lever position is P or N and
engine speed is over 2,000 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-
ies based on engine speed. C
Fuel cut will be operated until the engine speed reaches 1,100 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under Multiport Fuel Injection (MFI) System, EC-45,
"System Description". D

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G

Revision: August 2013 EC-585 2014 Maxima NAM

 PRECAUTIONS
< PRECAUTION > [VQ35DE]

PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000010095249

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.

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• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery and wait at least three minutes before performing any service.
On Board Diagnostic (OBD) System of Engine and CVT INFOID:0000000010095250

The ECM has an on board diagnostic system. It will illuminate the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
• Always to turn the ignition switch OFF and disconnect the negative battery cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will
cause the MIL to illuminate.
• Always to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to illuminate due to the open circuit. (Always the connector is free from water, grease,
dirt, bent terminals, etc.)
• Certain systems and components, especially those related to OBD, may use a new style slide-lock-
ing type harness connector. For description and how to disconnect, refer to PG-57, "Description".
• Always to route and secure the harnesses properly after work. The interference of the harness with a
bracket, etc. may cause the MIL to illuminate due to the short circuit.
• Always to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to illuminate due to the malfunction of the EVAP system or fuel injection system,
etc.
• Always to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.

Revision: August 2013 EC-586 2014 Maxima NAM

 PRECAUTIONS
< PRECAUTION > [VQ35DE]
General Precautions INFOID:0000000010095251

A
• Always use a 12 volt battery as power source.
• Never attempt to disconnect battery cables while engine is
running. EC
• Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative bat-
tery cable. Failure to do so may damage the ECM because
battery voltage is applied to ECM even if ignition switch is C
turned OFF.
• Before removing parts, turn ignition switch OFF and then dis-
connect battery ground cable. D
SEF289H

• Never disassemble ECM. E

• If a battery cable is disconnected, the memory will return to the ECM value.
The ECM will now start to self-control at its initial value. Thus, engine operation can vary slightly in
this case. However, this is not an indication of a malfunction. Never replace parts because of a slight F
variation.
• If the battery is disconnected, the following emission-related diagnostic information will be lost
within 24 hours.

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- Diagnostic trouble codes G
- 1st trip diagnostic trouble codes
- Freeze frame data
- 1st trip freeze frame data H
- System readiness test (SRT) codes
- Test values
• When connecting ECM harness connector, fasten (B) it
securely with a lever (1) as far as it will go as shown in the fig- I
ure.

2 : ECM J
A : Loosen

PBIB2947E
L
• When connecting or disconnecting pin connectors into or
from ECM, never damage pin terminals (bends or break).
Check that there are not any bends or breaks on ECM pin ter- M
minal, when connecting pin connectors.
• Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge) volt-
N
age to develop in coil and condenser, thus resulting in dam-
age to ICs.
• Keep engine control system harness at least 10 cm (4 in) away
from adjacent harness, to prevent engine control system mal- O
functions due to receiving external noise, degraded operation
of ICs, etc.
PBIB0090E

• Keep engine control system parts and harness dry. P

Revision: August 2013 EC-587 2014 Maxima NAM

 PRECAUTIONS
< PRECAUTION > [VQ35DE]
• Before replacing ECM, perform ECM Terminals and Reference
Value inspection and check ECM functions properly. Refer to
EC-522, "Reference Value".
• Handle mass air flow sensor carefully to avoid damage.
• Never clean mass air flow sensor with any type of detergent.
• Never disassemble electric throttle control actuator.
• Even a slight leakage in the air intake system can cause seri-
ous incidents.
• Never shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
MEF040D

• After performing each TROUBLE DIAGNOSIS, perform DTC

Confirmation Procedure or Component Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Component Func-
tion Check should be a good result if the repair is completed.

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JSBIA1315ZZ

• When measuring ECM signals with a circuit tester, never allow

the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
• Never use ECM ground terminals when measuring input/out-
put voltage. Doing so may result in damage to the ECM's tran-
sistor. Use a ground other than ECM terminals, such as the
ground.

SEF348N

Revision: August 2013 EC-588 2014 Maxima NAM

 PRECAUTIONS
< PRECAUTION > [VQ35DE]
• B1 indicates bank 1, B2 indicates bank 2 as shown in the fig-
ure. A
• Never operate fuel pump when there is no fuel in lines.
• Tighten fuel hose clamps to the specified torque.
EC

SEC893C

D
• Never depress accelerator pedal when starting.
• Immediately after starting, never rev up engine unnecessarily.
• Never rev up engine just prior to shutdown. E

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G
SEF709Y

• When installing C.B. ham radio or a mobile phone, be sure to H

observe the following as it may adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possible from the electronic con- I
trol units.
- Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
J
Never let them run parallel for a long distance.
- Adjust the antenna and feeder line so that the standing-wave
ratio can be kept smaller.
- Be sure to ground the radio to vehicle body. K
SEF708Y

Revision: August 2013 EC-589 2014 Maxima NAM

 PREPARATION
< PREPARATION > [VQ35DE]

PREPARATION
PREPARATION
Special Service Tools INFOID:0000000010095252

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.) Description
Tool name
(J-44321) Checks fuel pressure
Fuel pressure gauge
kit

LEC642

(J-44321-6) Connects fuel pressure gauge to quick connector

Fuel pressure adapter type fuel lines

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LBIA0376E

Commercial Service Tools INFOID:0000000010095253

Tool name
Description
(Kent-Moore No.)
(J-45488) Removes fuel tube quick connectors in engine
Quick connector re- room
lease

PBIC0198E

Leakage detector Locates the EVAP leakage

i.e.: (J-41416)

S-NT703

EVAP service port Applys positive pressure via the EVAP service port
adapter
i.e.: (J-41413-OBD)

S-NT704

Revision: August 2013 EC-590 2014 Maxima NAM

 PREPARATION
< PREPARATION > [VQ35DE]
Tool name
Description
(Kent-Moore No.) A
Fuel filler cap adapter Checks fuel tank vacuum relief valve opening
i.e.: (MLR-8382) pressure
EC

C
S-NT815

Socket wrench Removes and installs engine coolant temperature

sensor. Refer to CO-24. D

S-NT705
F
Oxygen sensor thread Reconditions the exhaust system threads before
cleaner installing a new oxygen sensor. Use with anti-
i.e.: (J-43897-18) seize lubricant shown below.

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(J-43897-12) a: 18 mm diameter with pitch 1.5 mm for Zirco- G
nia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for Tita-
nia Oxygen Sensor
H
AEM488

Anti-seize lubricant Lubricates oxygen sensor thread cleaning tool

(PermatexTM
i.e.: when reconditioning exhaust system threads. I
133AR or equivalent
meeting MIL specifica-
tion MIL-A-907)
J

S-NT779

Revision: August 2013 EC-591 2014 Maxima NAM

 FUEL PRESSURE
< PERIODIC MAINTENANCE > [VQ35DE]

PERIODIC MAINTENANCE
FUEL PRESSURE
Inspection INFOID:0000000010095254

FUEL PRESSURE RELEASE

With CONSULT
1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
Without CONSULT
1. Remove fuel pump fuse located in IPDM E/R. Refer to FL-6, "Removal and Installation".
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel pressure.

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4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.
FUEL PRESSURE CHECK
CAUTION:
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
NOTE:
• Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel
pressure cannot be completely released because A35 models do not have fuel return system.
• Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick
connector o-ring maintains seal ability.
• Use Fuel Pressure Gauge Kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-44321-6)] to check
fuel pressure.
1. Release fuel pressure to zero.
2. Remove fuel hose using Quick Connector Release [SST (J-45488)]. Refer to FL-10, "Exploded View".
• Do not twist or kink fuel hose because it is plastic hose.
• Do not remove fuel hose (3) from quick connector.
• Keep fuel hose connections clean.
3. Install Fuel Pressure Adapter [SST (J-44321-6)] (2) and Fuel
Pressure Gauge kit [SST (J44321)] (1) as shown in figure.
• Do not distort or bend fuel rail tube when installing fuel pres-
sure gauge adapter.
• When reconnecting fuel hose, check the original fuel hose for
damage and abnormality.
4. Turn ignition switch ON (reactivate fuel pump) and check for fuel
leakage.
5. Start engine and check for fuel leakage.
6. Read the indication of fuel pressure gauge kit [SST (J-44321)].
• During fuel pressure check, check for fuel leakage from fuel ALBIA0614ZZ

connection every 3 minutes.

At idling : Approximately 350 kPa (3.57 kg/cm2, 51 psi)

7. If result is unsatisfactory, go to next step.
8. Check the following.
• Fuel hoses and fuel tubes for clogging
• Fuel filter for clogging
• Fuel pump

Revision: August 2013 EC-592 2014 Maxima NAM

 FUEL PRESSURE
< PERIODIC MAINTENANCE > [VQ35DE]
• Fuel pressure regulator for clogging
9. If OK, replace fuel pressure regulator. A
If NG, repair or replace malfunctioning part.
10. Before disconnecting Fuel Pressure Gauge kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-
44321-6)], release fuel pressure to zero. EC

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G

Revision: August 2013 EC-593 2014 Maxima NAM

 EVAP LEAK CHECK
< PERIODIC MAINTENANCE > [VQ35DE]
EVAP LEAK CHECK
Inspection INFOID:0000000010095255

CAUTION:
• Never use compressed air or a high pressure pump.
• Never exceed 4.12 kPa (0.042 kg/cm2, 0.6 psi) of pressure in EVAP system.
NOTE:
• Do not start engine.
• Improper installation of EVAP service port adapter (commercial service tool) to the EVAP service port may
cause a leakage.
WITH CONSULT
1. To locate the EVAP leakage, install EVAP service port adapter
(commercial service tool) and pressure pump to EVAP service
port.
2. Turn ignition switch ON.
3. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT
MODE” with CONSULT.
4. Touch “START”. A bar graph (Pressure indicating display) will

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appear on the screen.
5. Apply positive pressure to the EVAP system until the pressure
indicator reaches the middle of the bar graph. SEF462UA
6. Remove EVAP service port adapter (commercial service tool)
and hose with pressure pump.
7. Locate the leakage using a leakage detector (commercial ser-
vice tool). Refer to EC-94, "System Diagram".

SEF200U

WITHOUT CONSULT
1. To locate the EVAP leakage, install EVAP service port adapter
(commercial service tool) and pressure pump to EVAP service
port.
2. Apply battery voltage between the terminals of EVAP canister
vent control valve to make a closed EVAP system.
3. To locate the leakage, deliver positive pressure to the EVAP sys-
tem until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to
0.028 kg/cm2, 0.2 to 0.4 psi).
4. Remove EVAP service port adapter (commercial service tool)
and hose with pressure pump.
SEF462UA

Revision: August 2013 EC-594 2014 Maxima NAM

 EVAP LEAK CHECK
< PERIODIC MAINTENANCE > [VQ35DE]
5. Locate the leakage using a leakage detector (commercial ser-
vice tool). Refer to EC-94, "System Diagram". A

EC

SEF200U

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G

Revision: August 2013 EC-595 2014 Maxima NAM

 SERVICE DATA AND SPECIFICATIONS (SDS)
< SERVICE DATA AND SPECIFICATIONS (SDS) [VQ35DE]

SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)
Idle Speed INFOID:0000000010095256

Condition Specification
No load (in P or N position) 600 ± 50 rpm

Ignition Timing INFOID:0000000010095257

Condition Specification
No load (in P or N position) 12 ± 5° BTDC

Calculated Load Value INFOID:0000000010095258

Condition Specification (Using CONSULT or GST)

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At idle 10 – 35 %
At 2,500 rpm 10 – 35 %

Mass Air Flow Sensor INFOID:0000000010095259

Supply voltage Battery voltage (11 – 14 V)

Output voltage at idle (in N position) 0.9 – 1.2 V*
2.0 – 6.0 g/s at idle*
Mass air flow (Using CONSULT or GST)
7.0 – 20.0 g/s at 2,500 rpm*
*: Engine is warmed up to normal operating temperature and running under no load.

Revision: August 2013 EC-596 2014 Maxima NAM