TRANSMISSION/TRANSAXLE

SECTION

CVT

CVT

CVT

CONTENTS
SERVICE INFORMATION ............................ 5
INDEX FOR DTC ................................................. 5
Alphabetical Index ..................................................... 5
DTC No. Index .......................................................... 5

PRECAUTIONS ................................................... 7
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ................................................................... 7
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect ..................................... 7
Precaution for On Board Diagnosis (OBD) System
of CVT and Engine .................................................... 7
Service After Replacing TCM and Transaxle Assembly ....................................................................... 8
Removal and Installation Procedure for CVT Unit
Connector .................................................................. 9
Precaution ............................................................... 10
Service Notice or Precaution ................................... 12
ATFTEMP COUNT Conversion Table .................... 12

PREPARATION ..................................................13
Special Service Tool ............................................... 13
Commercial Service Tool ........................................ 13

CVT FLUID .........................................................14

Checking CVT Fluid ................................................ 14
Changing CVT Fluid ................................................ 15

CVT SYSTEM .....................................................16

Cross-Sectional View - RE0F10A ........................... 16
Control System ........................................................ 17
Hydraulic Control System ........................................ 18
TCM Function .......................................................... 18
CAN Communication ............................................... 19
Input/Output Signal of TCM ..................................... 19
Line Pressure and Secondary Pressure Control .... 20
Shift Control ............................................................ 20
Lock-up and Select Control ..................................... 22
Control Valve ........................................................... 23

Revision: July 2007

ON BOARD DIAGNOSTIC (OBD) SYSTEM .... 24

Introduction ..............................................................24
OBD-II Function for CVT System ............................24
One or Two Trip Detection Logic of OBD-II .............24
OBD-II Diagnostic Trouble Code (DTC) ..................24
Malfunction Indicator Lamp (MIL) ............................25

TROUBLE DIAGNOSIS .................................... 27

DTC Inspection Priority Chart ..................................27

Fail-Safe ..................................................................27
How to Perform Trouble Diagnosis for Quick and
Accurate Repair .......................................................28
CVT Electrical Parts Location ..................................33
Circuit Diagram ........................................................34
Inspections before Trouble Diagnosis .....................35
Road Test ................................................................38
Check before Engine Is Started ...............................39
Check at Idle ............................................................39
Cruise Test ..............................................................41
Vehicle Speed When Shifting Gears .......................43
TCM Input/Output Signal Reference Value .............44
CONSULT-III Function (TRANSMISSION) ..............46
Diagnosis Procedure without CONSULT-III ............53

DTC U1000 CAN COMMUNICATION LINE ..... 54

Description ...............................................................54
On Board Diagnosis Logic .......................................54
Possible Cause ........................................................54
DTC Confirmation Procedure ..................................54
Wiring Diagram - CVT - CAN ...................................55
Diagnosis Procedure ...............................................56

DTC U1010 TRANSMISSION CONTROL

MODULE (CAN) ................................................ 57
Description ...............................................................57
On Board Diagnosis Logic .......................................57
Possible Cause ........................................................57
DTC Confirmation Procedure ..................................57
Diagnosis Procedure ...............................................57

DTC P0703 STOP LAMP SWITCH CIRCUIT ... 58

CVT-1

2008 Sentra

Description .............................................................. 58
CONSULT-III Reference Value .............................. 58
On Board Diagnosis Logic ...................................... 58
Possible Cause ....................................................... 58
DTC Confirmation Procedure ................................. 58
Diagnosis Procedure .............................................. 58

DTC P0705 PARK/NEUTRAL POSITION

SWITCH ............................................................. 60
Description .............................................................. 60
CONSULT-III Reference Value .............................. 60
On Board Diagnosis Logic ...................................... 60
Possible Cause ....................................................... 60
DTC Confirmation Procedure ................................. 60
Wiring Diagram - CVT - PNP/SW ........................... 61
Diagnosis Procedure .............................................. 62
Component Inspection ............................................ 63

DTC P0710 CVT FLUID TEMPERATURE

SENSOR CIRCUIT ............................................. 65
Description .............................................................. 65
CONSULT-III Reference Value .............................. 65
On Board Diagnosis Logic ...................................... 65
Possible Cause ....................................................... 65
DTC Confirmation Procedure ................................. 65
Wiring Diagram - CVT - FTS ................................... 66
Diagnosis Procedure .............................................. 67
Component Inspection ............................................ 68

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR) ............................ 70
Description .............................................................. 70
CONSULT-III Reference Value .............................. 70
On Board Diagnosis Logic ...................................... 70
Possible Cause ....................................................... 70
DTC Confirmation Procedure ................................. 70
Wiring Diagram - CVT - PRSCVT ........................... 71
Diagnosis Procedure .............................................. 72

DTC P0720 VEHICLE SPEED SENSOR CVT

(SECONDARY SPEED SENSOR) ..................... 75
Description .............................................................. 75
CONSULT-III Reference Value .............................. 75
On Board Diagnosis Logic ...................................... 75
Possible Cause ....................................................... 75
DTC Confirmation Procedure ................................. 75
Wiring Diagram - CVT - SESCVT ........................... 76
Diagnosis Procedure .............................................. 77

DTC P0725 ENGINE SPEED SIGNAL .............. 80

Description .............................................................. 80
CONSULT-III Reference Value .............................. 80
On Board Diagnosis Logic ...................................... 80
Possible Cause ....................................................... 80
DTC Confirmation Procedure ................................. 80
Diagnosis Procedure .............................................. 80

DTC P0730 BELT DAMAGE ............................. 82

Description .............................................................. 82
CONSULT-III Reference Value .............................. 82
Revision: July 2007

On Board Diagnosis Logic ...................................... 82

Possible Cause ....................................................... 82
DTC Confirmation Procedure .................................. 82
Diagnosis Procedure ............................................... 82

DTC P0740 TORQUE CONVERTER CLUTCH

SOLENOID VALVE ........................................... 83
Description .............................................................. 83
CONSULT-III Reference Value ............................... 83
On Board Diagnosis Logic ...................................... 83
Possible Cause ....................................................... 83
DTC Confirmation Procedure .................................. 83
Wiring Diagram - CVT - TCV .................................. 84
Diagnosis Procedure ............................................... 85
Component Inspection ............................................ 86

DTC P0744 A/T TCC S/V FUNCTION (LOCKUP) ..................................................................... 88

Description .............................................................. 88
CONSULT-III Reference Value ............................... 88
On Board Diagnosis Logic ...................................... 88
Possible Cause ....................................................... 88
DTC Confirmation Procedure .................................. 88
Diagnosis Procedure ............................................... 88

DTC P0745 LINE PRESSURE SOLENOID

VALVE ............................................................... 90
Description .............................................................. 90
CONSULT-III Reference Value ............................... 90
On Board Diagnosis Logic ...................................... 90
Possible Cause ....................................................... 90
DTC Confirmation Procedure .................................. 90
Wiring Diagram - CVT - LPSV ................................ 91
Diagnosis Procedure ............................................... 92
Component Inspection ............................................ 93

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRESSURE

SOLENOID VALVE) .......................................... 95
Description .............................................................. 95
CONSULT-III Reference Value ............................... 95
On Board Diagnosis Logic ...................................... 95
Possible Cause ....................................................... 95
DTC Confirmation Procedure .................................. 95
Diagnosis Procedure ............................................... 95

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRESSURE

SOLENOID VALVE) .......................................... 97
Description .............................................................. 97
CONSULT-III Reference Value ............................... 97
On Board Diagnosis Logic ...................................... 97
Possible Cause ....................................................... 97
DTC Confirmation Procedure .................................. 97
Diagnosis Procedure ............................................... 97

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE SOLENOID VALVE) ............................................... 99

CVT-2

2008 Sentra

Description .............................................................. 99
CONSULT-III Reference Value ............................... 99
On Board Diagnosis Logic ...................................... 99
Possible Cause ....................................................... 99
DTC Confirmation Procedure .................................. 99
Wiring Diagram - CVT - SECPSV ......................... 100
Diagnosis Procedure ............................................. 101
Component Inspection .......................................... 102

DTC P0826 MANUAL MODE SWITCH CIRCUIT .................................................................. 104

Description ............................................................ 104
CONSULT-III Reference Value in Data Monitor
Mode ..................................................................... 104
On Board Diagnosis Logic .................................... 104
Possible Cause ..................................................... 104
DTC Confirmation Procedure ................................ 104
Wiring Diagram - CVT - MMSW ............................ 105
Diagnosis Procedure ............................................. 106
Component Inspection .......................................... 108

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC PRESSURE SENSOR) ............................................... 109
Description ............................................................ 109
CONSULT-III Reference Value ............................. 109
On Board Diagnosis Logic .................................... 109
Possible Cause ..................................................... 109
DTC Confirmation Procedure ................................ 109
Wiring Diagram - CVT - SECPS ............................ 110
Diagnosis Procedure ............................................. 111

DTC P0841 PRESSURE SENSOR FUNCTION ................................................................. 113

Description ............................................................ 113
CONSULT-III Reference Value ............................. 113
On Board Diagnosis Logic .................................... 113
Possible Cause ..................................................... 113
DTC Confirmation Procedure ................................ 113
Diagnosis Procedure ............................................. 113

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRESSURE

SENSOR) .......................................................... 115
Description ............................................................ 115
CONSULT-III Reference Value ............................. 115
On Board Diagnosis Logic .................................... 115
Possible Cause ..................................................... 115
DTC Confirmation Procedure ................................ 115
Wiring Diagram - CVT - PRIPS ............................. 116
Diagnosis Procedure ............................................. 117

DTC P0868 SECONDARY PRESSURE

DOWN ............................................................... 119
Description ............................................................ 119
CONSULT-III Reference Value ............................. 119
On Board Diagnosis Logic .................................... 119
Possible Cause ..................................................... 119
DTC Confirmation Procedure ................................ 119
Revision: July 2007

Diagnosis Procedure ............................................. 119

DTC P1701 TRANSMISSION CONTROL

MODULE (POWER SUPPLY) ......................... 121
Description ............................................................. 121
On Board Diagnosis Logic ..................................... 121
Possible Cause ...................................................... 121
DTC Confirmation Procedure ................................ 121
Wiring Diagram - CVT - POWER ........................... 122
Diagnosis Procedure ............................................. 123

DTC P1705 THROTTLE POSITION SENSOR. 125

Description ............................................................. 125
CONSULT-III Reference Value ............................. 125
On Board Diagnosis Logic ..................................... 125
Possible Cause ...................................................... 125
DTC Confirmation Procedure ................................ 125
Diagnosis Procedure ............................................. 125

DTC P1722 ESTM VEHICLE SPEED SIGNAL. 127

Description ............................................................. 127
CONSULT-III Reference Value ............................. 127
On Board Diagnosis Logic ..................................... 127
Possible Cause ...................................................... 127
DTC Confirmation Procedure ................................ 127
Diagnosis Procedure ............................................. 127

DTC P1723 CVT SPEED SENSOR FUNCTION ................................................................ 129

Description ............................................................. 129
On Board Diagnosis Logic ..................................... 129
Possible Cause ...................................................... 129
DTC Confirmation Procedure ................................ 129
Diagnosis Procedure ............................................. 129

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM ............................................... 131

Description ............................................................. 131
On Board Diagnosis Logic ..................................... 131
Possible Cause ...................................................... 131
DTC Confirmation Procedure ................................ 131
Diagnosis Procedure ............................................. 131

CVT

DTC P1740 LOCK-UP SELECT SOLENOID

VALVE CIRCUIT ............................................. 132
Description ............................................................. 132
CONSULT-III Reference Value ............................. 132
On Board Diagnosis Logic ..................................... 132
Possible Cause ...................................................... 132
DTC Confirmation Procedure ................................ 132
Wiring Diagram - CVT - L/USSV ........................... 133
Diagnosis Procedure ............................................. 134
Component Inspection ........................................... 135

DTC P1745 LINE PRESSURE CONTROL ..... 137

Description ............................................................. 137
On Board Diagnosis Logic ..................................... 137
Possible Cause ...................................................... 137
DTC Confirmation Procedure ................................ 137
Diagnosis Procedure ............................................. 137

CVT-3

2008 Sentra

DTC P1777 STEP MOTOR - CIRCUIT ............ 138

CVT SHIFT LOCK SYSTEM ............................. 167

Description .............................................................138
CONSULT-III Reference Value .............................138
On Board Diagnosis Logic .....................................138
Possible Cause ......................................................138
DTC Confirmation Procedure ................................138
Wiring Diagram - CVT - STM .................................139
Diagnosis Procedure .............................................140
Component Inspection ...........................................141

Description ............................................................ 167

Shift Lock System Electrical Parts Location .......... 167
Wiring Diagram - CVT - SHIFT ............................. 168
Diagnosis Procedure ............................................. 168

DTC P1778 STEP MOTOR - FUNCTION ........ 142

Description .............................................................142
CONSULT-III Reference Value .............................142
On Board Diagnosis Logic .....................................142
Possible Cause ......................................................142
DTC Confirmation Procedure ................................142
Diagnosis Procedure .............................................143

OVERDRIVE CONTROL SWITCH .................. 144

Description .............................................................144
CONSULT-III Reference Value .............................144
Wiring Diagram - CVT - ODSW .............................145
Diagnosis Procedure .............................................146
Component Inspection ...........................................147

SHIFT POSITION INDICATOR CIRCUIT ........ 149

Description .............................................................149
CONSULT-III Reference Value .............................149
Diagnosis Procedure .............................................149

TROUBLE DIAGNOSIS FOR SYMPTOMS ..... 150

Wiring Diagram - CVT - NONDTC .........................150
O/D OFF Indicator Lamp Does Not Come On .......153
Engine Cannot Be Started in "P" or "N" Position ..155
In "P" Position, Vehicle Moves Forward or Backward When Pushed ...............................................155
In "N" Position, Vehicle Moves ..............................156
Large Shock "N" "R" Position ............................156
Vehicle Does Not Creep Backward in "R" Position..157
Vehicle Does Not Creep Forward in "D" or "L" Position ......................................................................158
Vehicle Speed Does Not Change in "L" Position ..159
Vehicle Speed Does Not Change in overdrive-off
mode ......................................................................160
Vehicle Speed Does Not Change in "D" Position ..161
Cannot Be Changed to Manual Mode ...................161
CVT Does Not Shift in Manual Mode .....................162
Vehicle Does Not Decelerate by Engine Brake .....163

TRANSMISSION CONTROL MODULE .......... 165

Removal and Installation .......................................165

Revision: July 2007

SHIFT CONTROL SYSTEM ............................. 171

Removal and Installation ....................................... 171
Selector Lever Knob Removal and Installation ..... 172
Adjustment of CVT Position .................................. 173
Checking of CVT Position ..................................... 173
Adjustment of PNP switch ..................................... 174

KEY INTERLOCK CABLE ............................... 175

Removal and Installation ....................................... 175

ON-VEHICLE SERVICE ................................... 178

Oil Pan .................................................................. 178
Park/Neutral Position (PNP) Switch ...................... 178
Primary Speed Sensor .......................................... 179
Secondary Speed Sensor ..................................... 180
Differential Side Oil Seal ....................................... 180
Oil Pump Fitting Bolt ............................................. 181

AIR BREATHER HOSE .................................... 183

Removal and Installation (MR20DE) ..................... 183
Removal and Installation (QR25DE) ..................... 184

CVT FLUID COOLER SYSTEM ....................... 185

CVT Fluid Cooler Removal and Installation(MR20DE) ....................................................... 185
CVT Fluid Cooler Removal and Installation
(QR25DE) ............................................................. 185

TRANSAXLE ASSEMBLY ............................... 187

Removal and Installation (MR20DE) ..................... 187
Removal and Installation (QR25DE) ..................... 189

REPAIR FOR COMPONENT PARTS .............. 192

Torque Converter and Converter Housing Oil Seal
. 192

SERVICE DATA AND SPECIFICATIONS

(SDS) ................................................................ 193
General Specification ............................................ 193
Vehicle Speed When Shifting Gears ..................... 193
Stall Speed ............................................................ 193
Line Pressure ........................................................ 194
Solenoid Valves .................................................... 194
CVT Fluid Temperature Sensor ............................ 194
Primary Speed Sensor .......................................... 194
Secondary Speed Sensor ..................................... 194
Removal and Installation ....................................... 194

CVT-4

2008 Sentra

INDEX FOR DTC

< SERVICE INFORMATION >

SERVICE INFORMATION

INDEX FOR DTC

Alphabetical Index

INFOID:0000000001850929

NOTE:
If DTC U1000 CAN COMM CIRCUIT is displayed with other DTCs, first perform the trouble diagnosis
CVT
for DTC U1000 CAN COMMUNICATION LINE. Refer to CVT-54.
DTC

OBD-II

Except OBD-II

CONSULT-III
GST*1

CONSULT-III only
TRANSMISSION

A/T TCC S/V FNCTN

P0744

P0744

CVT-88

ATF TEMP SEN/CIRC

P0710

P0710

CVT-65

BELT DAMG

P0730

CVT-82

BRAKE SW/CIRC

P0703

CVT-58

CAN COMM CIRCUIT

U1000

U1000

CVT-54

TRANSMISSION CONTROL UNIT (CAN)

U1010

U1010

CVT-57

CVT SPD SEN/FNCTN

P1723

CVT-129

ENGINE SPEED SIG

P0725

CVT-80

ELEC TH CONTROL

P1726

CVT-131

ESTM VEH SPD SIG*2

P1722

CVT-127

INPUT SPD SEN/CIRC

P0715

P0715

CVT-70

L/PRESS CONTROL

P1745

CVT-137

L/PRESS SOL/CIRC

P0745

P0745

CVT-90

LU-SLCT SOL/CIRC

P1740

P1740

CVT-132

Items
(CONSULT-III screen terms)

MANUAL MODE SWITCH

Reference page

P0826

CVT-104

P0705

P0705

CVT-60

P0841

CVT-113

PRS CNT SOL/A FCTN

P0746

P0746

CVT-95

PRS CNT SOL/B CIRC

P0778

P0778

CVT-99

PRS CNT SOL/B FCTN

P0776

P0776

CVT-97

P0868

CVT-119

P1777

P1777

CVT-138

PNP SW/CIRC
PRESS SEN/FNCTN

SEC/PRESS DOWN
STEP MOTR CIRC
STEP MOTR/FNC

P1778

P1778

CVT-142

TCC SOLENOID/CIRC

P0740

P0740

CVT-83

TCM-POWER SUPPLY

P1701

CVT-121

TP SEN/CIRC A/T

P1705

CVT-125

TR PRS SENS/A CIRC

P0840

P0840

CVT-109

TR PRS SENS/B CIRC

P0845

P0845

CVT-115

VEH SPD SEN/CIR AT

P0720

P0720

CVT-75

*1: These numbers are prescribed by SAE J2012.

*2: Models without ABS does not indicate.

DTC No. Index

INFOID:0000000001850930

NOTE:
Revision: July 2007

CVT-5

2008 Sentra

INDEX FOR DTC

< SERVICE INFORMATION >
If DTC U1000 CAN COMM CIRCUIT is displayed with other DTCs, first perform the trouble diagnosis
for DTC U1000 CAN COMMUNICATION LINE. Refer to CVT-54 .
DTC
OBD-II

Except OBD-II

CONSULT-III
GST*1

CONSULT-III only
TRANSMISSION

P0703

BRAKE SW/CIRC

CVT-58

P0705

P0705

PNP SW/CIRC

CVT-60

P0710

P0710

ATF TEMP SEN/CIRC

CVT-65

P0715

P0715

INPUT SPD SEN/CIRC

CVT-70

P0720

P0720

VEH SPD SEN/CIR AT

CVT-75

P0725

ENGINE SPEED SIG

CVT-80

P0730

BELT DAMG

CVT-82

P0740

P0740

TCC SOLENOID/CIRC

CVT-83

P0744

P0744

A/T TCC S/V FNCTN

CVT-88

P0745

P0745

L/PRESS SOL/CIRC

CVT-90

P0746

P0746

PRS CNT SOL/A FCTN

CVT-95

P0776

P0776

PRS CNT SOL/B FCTN

CVT-97

P0778

P0778

PRS CNT SOL/B CIRC

CVT-99

P0826

MANUAL MODE SWITCH

CVT-104

P0840

P0840

TR PRS SENS/A CIRC

CVT-109

P0841

PRESS SEN/FNCTN

CVT-113

P0845

P0845

TR PRS SENS/B CIRC

CVT-115

P0868

SEC/PRESS DOWN

CVT-119

P1701

TCM-POWER SUPPLY

CVT-121

P1705

TP SEN/CIRC A/T

CVT-125

Items
(CONSULT-III screen terms)

Reference page

CVT-127

P1722

ESTM VEH SPD SIG*

P1723

CVT SPD SEN/FNCTN

CVT-129

P1726

ELEC TH CONTROL

CVT-131

P1740

P1740

LU-SLCT SOL/CIRC

CVT-132

P1745

L/PRESS CONTROL

CVT-137

P1777

P1777

STEP MOTR CIRC

CVT-138

P1778

P1778

STEP MOTR/FNC

CVT-142

U1000

U1000

CAN COMM CIRCUIT

CVT-54

U1010

U1010

TRANSMISSION CONTROL UNIT (CAN)

CVT-57

*1: These numbers are prescribed by SAE J2012.

*2: Models without ABS does not indicate.

Revision: July 2007

CVT-6

2008 Sentra

PRECAUTIONS
< SERVICE INFORMATION >

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000001850931

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 CVT
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 SRS and SB section of this Service ManD
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 E
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
F
Module, see the SRS section.
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 harG
ness connectors.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000001850932

NOTE:
This Procedure is applied only to models with Intelligent Key system and NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS).
Remove and install all control units after disconnecting both battery cables with the ignition knob in the
LOCK position.
Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NVIS/IVIS, an electrically controlled steering lock
mechanism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.

2.
3.
4.
5.
6.

Connect both battery cables.

NOTE:
Supply power using jumper cables if battery is discharged.
Use the Intelligent Key or mechanical key to turn the ignition switch to the ACC position. At this time, the
steering lock will be released.
Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
Perform the necessary repair operation.
When the repair work is completed, return the ignition switch to the LOCK position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
Perform a self-diagnosis check of all control units using CONSULT-III.

Precaution for On Board Diagnosis (OBD) System of CVT and Engine

INFOID:0000000001850933

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:

Revision: July 2007

OPERATION PROCEDURE
1.

CVT-7

2008 Sentra

PRECAUTIONS
< SERVICE INFORMATION >
Be sure to turn the ignition switch OFF and disconnect the battery cable from the negative terminal
before any repair or inspection work. The open/short circuit of related switches, sensors, solenoid
valves, etc. will cause the MIL to light up.
Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to an open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
Be sure to route and secure the harnesses properly after work. Interference of the harness with a
bracket, etc. may cause the MIL to light up due to a short circuit.
Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to a malfunction of the EVAP system or fuel injection system, etc.
Be sure to erase the unnecessary malfunction information (repairs completed) from the TCM and
ECM before returning the vehicle to the customer.

Service After Replacing TCM and Transaxle Assembly

INFOID:0000000001850934

SERVICE AFTER REPLACING TCM AND TRANSAXLE ASSEMBLY

Perform the applicable service in the following sheet when replacing TCM or transaxle assembly
CAUTION:
Do not start the engine until the service is completed.
TCM- POWER SUPPLY [P1701] may be indicated soon after replacing TCM or transaxle assembly
(after erasing the memory at the pattern B). Restart the self-diagnosis after erasing the self-diagnosis
result. Check that no error is detected.
TCM

CVT assembly

Service pattern

Replace the new unit.

Do not replace the unit.

"PATTERN A"

Do not replace the unit.

Replace either the old unit or

new unit.
Do not replace the unit.

Replace the old unit.

Replace the new unit.

"PATTERN B"

Replace either the old unit or

new unit.
Replace either the old unit or
new unit.

"PATTERN C"

NOTE:
Old unit means that the unit has been already used for another vehicle.

PATTERN A
1.
2.

Shift the selector lever to P position after replacing TCM. Turn the ignition switch ON.
Check that the shift position indicator in the combination meter turns ON (It indicates approximately 1 or 2
seconds after turning the ignition switch ON.)
Check the following items if the shift position indicator does not turn ON. Repair or replace the shift position indicator if necessary.
- The harness between TCM and ROM ASSY in the transaxle assembly is open or short.
- Cable disconnected, loosen, or bent from the connector housing.

PATTERN B
1.
2.

3.
4.
5.

6.
7.

Turn the ignition switch ON after replacing each part.

Start engine.
CAUTION:
Do not start the driving.
Touch CONSULT-III screen in the order of DATA MONITOR, and MAIN SIGNALS.
Warm up the transaxle assembly until ATF TEMP COUNT indicates 47 [approximately 20C(68F)] or
more. Turn the ignition switch OFF.
Turn the ignition switch ON.
CAUTION:
Do not start engine.
Select SELF-DIAG RESULTS.
Shift the selector lever to R position.

Revision: July 2007

CVT-8

2008 Sentra

PRECAUTIONS
< SERVICE INFORMATION >
8. Depress slightly the accelerator pedal (Pedal angle: 2/8) while depressing the brake pedal.
A
9. Perform ERASE.
10. Shift the selector lever to R position after replacing TCM. Turn the ignition switch OFF.
11. Wait approximately 10 minutes after turning the ignition switch OFF.
B
12. Turn the ignition switch ON while shifting the selector lever to R position.
CAUTION:
Do not start engine.
CVT
13. Select Special function.
14. Check that the value on CALIBRATION DATA is same as the data after erasing "Calibration Data".
Restart the procedure from step 3 if the values are not same.
D
15. Shift the selector lever to P position.
16. Check that the shift position indicator in the combination meter turns ON (It indicates approximately 1 or 2
seconds after shifting the selector lever to P position.)
Check the following items if the shift position indicator does not turn ON. Repair or replace the shift posi- E
tion indicator if necessary.
- The harness between TCM and ROM ASSY in the transaxle assembly is open or short.
- Cable disconnected, loosen, or bent from the connector housing.
F
- Power supply and ground of TCM. Refer to CVT-121.
Calibration Data
G

Data after deletion

Item name

Display value

Item name

Display value

UNIT CLB ID 1

0000

GAIN PL

256

UNIT CLB ID 2

0000

OFFSET PL

40

UNIT CLB ID 3

0000

OFFSET2 PL

UNIT CLB ID 4

0000

MAP NO SEC

32

UNIT CLB ID 5

0000

GAIN SEC

256

UNIT CLB ID 6

0000

OFFSET SEC

40

MAP NO LU

33

OFFSET2 SEC

GAIN LU

256

MAP NO SL

32

OFFSET LU

40

GAIN SL

256

OFFSET2 LU

OFFSET SL

40

MAP NO PL

32

OFFSET2 SL

PATTERN C
1.
2.

Replace the transaxle assembly first, and then replace TCM.

Perform the service of PATTERN A.
(Perform the service of PATTERN B if TCM is replaced first.)

Removal and Installation Procedure for CVT Unit Connector

M
INFOID:0000000001850935

REMOVAL
Rotate bayonet ring (1) counterclockwise, pull out CVT unit harness
connector (2) outward and disconnect it.

WCIA0686E

INSTALLATION
Revision: July 2007

CVT-9

2008 Sentra

PRECAUTIONS
< SERVICE INFORMATION >
1. Align CVT unit harness connector terminal body marking with
bayonet ring marking, insert CVT unit harness connector, and
then rotate bayonet ring clockwise.

SCIA2097E

2.

Rotate bayonet ring clockwise until CVT unit harness connector

terminal body marking is aligned with the bayonet ring marking
(linear slit) as shown.

SCIA2098E

CAUTION:
Securely align CVT unit harness connector terminal body
marking with bayonet ring marking (linear slit). Do not
make a half fit condition as shown.
Do not mistake the bayonet ring marking (linear slit) for
other dent portion.

SCIA2099E

Precaution

INFOID:0000000001850936

NOTE:
If any malfunction occurs in the RE0F10A model transaxle, replace the entire transaxle assembly.
Before connecting or disconnecting the TCM harness connector, turn ignition switch OFF and disconnect negative battery
cable. Because battery voltage is applied to TCM even if ignition switch is turned OFF.

SEF289H

Revision: July 2007

CVT-10

2008 Sentra

PRECAUTIONS
< SERVICE INFORMATION >
When connecting or disconnecting pin connectors into or
from TCM, take care not to damage pin terminals (bend or
break).
When connecting pin connectors make sure that there are not
any bends or breaks on TCM pin terminal.

CVT
SEF291H

Before replacing TCM, perform TCM input/output signal

inspection and make sure whether TCM functions properly or
not. CVT-44, "TCM Input/Output Signal Reference Value".

G
MEF040DA

After performing each TROUBLE DIAGNOSIS, perform DTC

Confirmation Procedure.
If the repair is completed the DTC should not be displayed in
the DTC Confirmation Procedure.
Always use the specified brand of CVT fluid. Refer to MA-13,
"MR20DE".
Use lint-free paper, not cloth rags, during work.
After replacing the CVT fluid, dispose of the waste oil using the
methods prescribed by law, ordinance, etc.
Before proceeding with disassembly, thoroughly clean the outside
of the transaxle. It is important to prevent the internal parts from
SEF217U
becoming contaminated by dirt or other foreign matter.
Disassembly should be done in a clean work area.
Place disassembled parts in order for easier and proper assembly.
All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.
Gaskets, seals and O-rings should be replaced.
It is very important to perform functional tests whenever they are indicated.
Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings and
seals.
Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
Clean or replace CVT fluid cooler if excessive foreign material is found in oil pan.
When the CVT drain plug is removed, only some of the fluid is drained. Old CVT fluid will remain in torque
converter and CVT fluid cooling system.
Always follow the procedures under Changing CVT Fluid in the CVT section when changing CVT fluid.
Refer to CVT-14, "Checking CVT Fluid", CVT-15, "Changing CVT Fluid".

TORQUE CONVERTER SERVICE

The torque converter should be replaced under any of the following conditions:
External leaks in the hub weld area.
Converter hub is scored or damaged.
Converter pilot is broken, damaged or fits poorly into crankshaft.
Steel particles are found after flushing the cooler and cooler lines.
Pump is damaged or steel particles are found in the converter.
Vehicle has TCC shudder and/or no TCC apply. Replace only after all hydraulic and electrical diagnoses
have been made. (Converter clutch material may be glazed.)
Revision: July 2007

CVT-11

2008 Sentra

PRECAUTIONS
< SERVICE INFORMATION >
Converter is contaminated with engine coolant containing antifreeze.
Internal malfunction of stator roller clutch.
Heavy clutch debris due to overheating (blue converter).
Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are
worn or damaged indicates that lining material came from converter.
The torque converter should not be replaced if:
The fluid has an odor, is discolored, and there is no evidence of metal or clutch facing particles.
The threads in one or more of the converter bolt holes are damaged.
CVT malfunction did not display evidence of damaged or worn internal parts, steel particles or clutch plate
lining material in unit and inside the fluid filter.
Vehicle has been exposed to high mileage (only). The exception may be where the torque converter clutch
dampener plate lining has seen excess wear by vehicles operated in heavy and/or constant traffic, such as
taxi, delivery or police use.

Service Notice or Precaution

INFOID:0000000001850937

OBD-II SELF-DIAGNOSIS
CVT self-diagnosis is performed by the TCM in combination with the ECM. The results can be read through
the blinking pattern of the malfunction indicator lamp (MIL). Refer to the table on CVT-46, "CONSULT-III
Function (TRANSMISSION)" for the indicator used to display each self-diagnostic result.
The self-diagnostic results indicated by the MIL are automatically stored in both the ECM and TCM memories.
Always perform the procedure on CVT-24, "OBD-II Diagnostic Trouble Code (DTC)" to complete the
repair and avoid unnecessary blinking of the MIL.
For details of OBD-II, refer to EC-50.
Certain systems and components, especially those related to OBD, may use the new style slide-locking type harness connector. For description and how to disconnect, refer to PG-61.

ATFTEMP COUNT Conversion Table

INFOID:0000000003110986

ATFTEMP COUNT

Temperature C (F)

ATFTEMP COUNT

Temperature C (F)

30 (22)

177

90 (194)

20 (4)

183

95 (203)

13

10 (14)

190

100 (212)

17

5 (23)

196

105 (221)

21

0 (32)

201

110 (230)

27

5 (41)

206

115 (239)

32

10 (50)

210

120 (248)

39

15 (59)

214

125 (257)

47

20 (68)

218

130 (266)

55

25 (77)

221

135 (275)

64

30 (86)

224

140 (284)

73

35 (95)

227

145 (293)

83

40 (104)

229

150 (302)

93

45 (113)

231

155 (311)

104

50 (122)

233

160 (320)

114

55 (131)

235

165 (329)

124

60 (140)

236

170 (338)

134

65 (149)

238

175 (347)

143

70 (158)

239

180 (356)

152

75 (167)

241

190 (374)

161

80 (176)

243

200 (392)

169

85 (185)

Revision: July 2007

CVT-12

2008 Sentra

PREPARATION
< SERVICE INFORMATION >

PREPARATION

Special Service Tool

INFOID:0000000001850938

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number
(Kent-Moore No.)
Tool name

Description

(OTC3492)
Oil pressure gauge set

Measuring line pressure

CVT

E
SCIA7531E

Installing differential side oil seal

a: 54 mm (2.13 in)
b: 32 mm (1.26 in)

KV38100300
( )
Drift

G
ZZA1046D

Commercial Service Tool

INFOID:0000000001850939

Tool number
Tool name

Description

Power tool

Loosening nuts and bolts

K
PBIC0190E

Drift

Installing converter housing oil seal

a: 65 mm (2.56 in)
b: 60 mm (2.36 in)

NT086

Revision: July 2007

CVT-13

2008 Sentra

CVT FLUID
< SERVICE INFORMATION >

CVT FLUID
Checking CVT Fluid

INFOID:0000000001850940

FLUID LEVEL CHECK

Fluid level should be checked with the fluid warmed up to 50 to 80C (122 to 176F).
1. Check for fluid leakage.
2. With the engine warmed up, drive the vehicle to warm up the
CVT fluid. When ambient temperature is 20C (68F), it takes
about 10 minutes for the CVT fluid to warm up to 50 to 80C
(122 to 176F).
3. Park the vehicle on a level surface and set the parking brake.
4. With engine at idle, while depressing brake pedal, move the
selector lever throughout the entire shift range and return it to
the P position.
SMA146B

5.

Press the tab on the CVT fluid level gauge to release the lock
and pull out the CVT fluid level gauge from the CVT fluid charging pipe.

SCIA1933E

6.

Wipe fluid off the CVT fluid level gauge. Then rotate the CVT
fluid level gauge 180 and re-insert it into the CVT charging pipe
as far as it will go.
CAUTION:
Always use lint free paper towels to wipe fluid off the CVT
fluid level gauge.

SCIA1931E

7.

Remove the CVT fluid level gauge and check that the fluid level
is within the specified range as shown. If the fluid level is at or
below the low side of the range, add the necessary specified
NISSAN CVT fluid through the CVT charging pipe.
Fluid grade:

Refer to MA-13, "MR20DE".

CAUTION:
Only use specified NISSAN CVT fluid.
Do not overfill the CVT.
SCIA1932E

8.

Install the CVT fluid level gauge to the CVT fluid charging pipe until it locks.
CAUTION:
When CVT fluid level gauge is installed into the CVT fluid charging pipe, make sure that the CVT
fluid level gauge is securely locked in place.

Revision: July 2007

CVT-14

2008 Sentra

CVT FLUID
< SERVICE INFORMATION >
FLUID CONDITION CHECK
A
Fluid status

Conceivable cause

Required operation

Varnished (viscous
varnish state)

CVT fluid become

degraded due to
hugh temperatures.

Replace the CVT fluid and check the

CVT main unit and the vehicle for
malfunctions (wire harness, cooler
pipes, etc.)

Milky white or cloudy

Water in the fluid

Replace the CVT fluid and check for

places where water is getting in.

Large amount of
metal powder mixed
in fluid

Unusual wear of
sliding parts within
CVT

Replace the CVT fluid and check for

improper operation of the CVT.

INFOID:0000000001850941

Remove drain plug, and drain CVT fluid from oil pan.
Install drain plug with new gasket to oil pan and tighten to the specified torque.
Drain plug:

3.

CVT

ATA0022D

Changing CVT Fluid

1.
2.

Refer to CVT-187, "Removal and

Installation (MR20DE)".
G

CAUTION:
Do not reuse drain plug gasket.
Fill CVT fluid from CVT fluid charging pipe to the specified level.
Fluid grade and capacity:

Refer to MA-13, "MR20DE".

CAUTION:
Use only Genuine NISSAN CVT Fluid NS-2. Do not mix with other fluid.
Using CVT fluid other than Genuine NISSAN CVT Fluid NS-2 will deteriorate in driveability and
CVT durability, and may damage the CVT, which is not covered by the warranty.
When filling CVT fluid, take care not to scatter fluid on heat generating parts such as exhaust.
Sufficiently shake the container of CVT fluid before using.
4. With the engine warmed up, drive the vehicle in an urban area. When ambient temperature is 20C
(68F), it takes about 10 minutes for the CVT fluid to warm up to 50 to 80C (122 to 176F).
5. Check CVT fluid level and condition. Refer to CVT-14, "Checking CVT Fluid".
6. Repeat steps 1 through 5 if CVT fluid is contaminated.
CAUTION:
Delete CVT fluid deterioration date with CONSULT-III after changing CVT fluid.

Revision: July 2007

CVT-15

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >

CVT SYSTEM
Cross-Sectional View - RE0F10A

INFOID:0000000001850942

SCIA7792J

1.

Converter housing

2.

Driven sprocket

3.

Chain

4.

Reverse brake

5.

Oil pump

6.

Forward clutch

7.

Planetary carrier

8.

Primary pulley

9.

Sun gear

10. Steel belt

11. Side cover

12. Internal gear

13. Parking gear

14. Secondary pulley

15. Final gear

16. Differential case

17. Idler gear

18. Reduction gear

19. Taper roller bearing

20. Output gear

21. Drive sprocket

22. Input shaft

23. Torque converter

Revision: July 2007

CVT-16

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >

Control System

INFOID:0000000001850943

CVT

P
AWDIA0231GB

Revision: July 2007

CVT-17

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >

Hydraulic Control System

INFOID:0000000001850944

SCIA8216E

TCM Function

INFOID:0000000001850945

The function of the TCM is to:

Receive input signals sent from various switches and sensors.
Determine required line pressure, shifting point, and lock-up operation.
Send required output signals to the step motor and the respective solenoids.

CONTROL SYSTEM OUTLINE

The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift
position and reduces shifting and lock-up shocks.
SENSORS (or SIGNAL)
PNP switch
Accelerator pedal position signal
Closed throttle position signal
Engine speed signal
CVT fluid temperature sensor
Vehicle speed signal
Overdrive control signal
Manual mode switch signal*
Stop lamp switch signal
Primary speed sensor
Secondary speed sensor
Primary pressure sensor
Secondary pressure sensor

TCM

Shift control
Line pressure control
Primary pressure control
Secondary pressure control
Lock-up control
Engine brake control
Vehicle speed control
Fail-safe control
Self-diagnosis
CONSULT-III communication
line
Duet-EA control
CAN system
On board diagnosis

ACTUATORS

Step motor
Torque converter clutch solenoid
valve
Lock-up select solenoid valve
Line pressure solenoid valve
Secondary pressure solenoid
valve
Shift position indicator
O/D OFF indicator lamp
Manual mode indicator*
Starter relay

*:With QR25DE

Revision: July 2007

CVT-18

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >
CONTROL SYSTEM DIAGRAM
A

CVT

H
AWDIA0232GB

CAN Communication

INFOID:0000000001850946

SYSTEM DESCRIPTION
Refer to LAN-7.
J

Input/Output Signal of TCM

Control item
PNP switch
Accelerator pedal position signal

Input

(*1)

INFOID:0000000001850947

Fluid
pressure
control

Select control

Lock-up
control

CAN communication
control

Fail-safe
function
(*3)

Shift control

Closed throttle position signal(*1)

Engine speed signal(*1)

CVT fluid temperature sensor

Stop lamp switch

signal(*1)

Overdrive control signal(*1)

Primary speed sensor

Secondary speed sensor

Primary pressure sensor

Secondary pressure sensor

Revision: July 2007

M
X
X

CVT-19

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >
Fluid
pressure
control

Control item

Select control

Step motor

Output

Shift control

Lock-up
control

Fail-safe
function
(*3)

CAN communication
control

TCC solenoid valve

Lock-up select solenoid valve

Line pressure solenoid valve

Secondary pressure solenoid valve

X
X

(*2)

O/D OFF indicator signal

*1: Input by CAN communications.

*2: Output by CAN communications.
*3: If these input and output signals are different, the TCM triggers the fail-safe function.

Line Pressure and Secondary Pressure Control

INFOID:0000000001850948

When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM
controls the line pressure solenoid valve and secondary pressure solenoid valve.
This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving
state. Secondary pressure is controlled by decreasing line pressure.

SCIA1846E

NORMAL CONTROL
Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throttle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revolution speed, the brake signal, the PNP switch signal, the lock-up signal, the voltage, the target gear ratio, the
fluid temperature, and the fluid pressure.

FEEDBACK CONTROL
When controlling the normal fluid pressure or the selected fluid pressure, the secondary pressure can be set
more accurately by using the fluid pressure sensor to detect the secondary pressure and controlling the feedback.

Shift Control

INFOID:0000000001850949

In order to select the gear ratio which can obtain the driving force in accordance with driver's intention and the
vehicle condition, TCM monitors the driving conditions, such as the vehicle speed and the throttle position and
selects the optimum gear ratio, and determines the gear change steps to the gear ratio. Then send the com-

Revision: July 2007

CVT-20

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >
mand to the step motor, and control the flow-in/flow-out of line pressure from the primary pulley to determine
the position of the moving-pulley and control the gear ratio.

CVT

E
AWDIA0233GB

NOTE:
The gear ratio is set for every position separately.

D POSITION
Shifting over all the ranges of gear ratios from the lowest to the highest.

SCIA1953E

D POSITION OVERDRIVE SWITCH: ON

Gear ratio increases in general by limiting gear range on the HIGH
side of the gear ratio, and this arrows the generation of the constant
strong driving force.

SCIA8229E

L POSITION
By limiting the gear range to the lowest position, the strong driving
force and the engine brake can be secured.

SCIA8240E

M POSITION (With QR25DE)

Revision: July 2007

CVT-21

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >
When the selector lever is put in the manual shift gate side, the fixed
changing gear line is set. By moving the steering shift swtich to +
side or - side, the manual mode switch is changed over, and shift
change like M/T becomes possible following the changing gear set
line step by step.

SCIA4582E

DOWNHILL ENGINE BRAKE CONTROL (AUTO ENGINE BRAKE CONTROL)

When downhill is detected with the accelerator pedal released, the engine brake will be strengthened up by
downshifting so as not to accelerate the vehicle more than necessary.

ACCELERATION CONTROL
According to vehicle speed and a change of accelerator pedal angle, driver's request for acceleration and driving scene are judged. This function assists improvement in acceleration feeling by making the engine speed
proportionate to the vehicle speed. And a shift map which can gain a larger driving force is available for compatibility of mileage with drivability.

Lock-up and Select Control

INFOID:0000000001850950

The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid
valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or
releases the torque converter clutch piston.
When shifting between N (P) D (R), torque converter clutch solenoid controls engagement power of
forward clutch and reverse brake.
The lock-up applied gear range was expanded by locking up the
torque converter at a lower vehicle speed than conventional CVT
models.

SCIA1958E

TORQUE CONVERTER CLUTCH AND SELECT CONTROL VALVE CONTROL

Revision: July 2007

CVT-22

2008 Sentra

CVT SYSTEM
< SERVICE INFORMATION >
Lock-up and Select Control System Diagram
A

CVT

SCIA2374E

Lock-up Released
In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
Lock-up Applied
In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque
converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.

Select Control
When shifting between N (P)D (R), optimize the operating pressure on the basis of the throttle position, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.

Control Valve

J
INFOID:0000000001850951

FUNCTION OF CONTROL VALVE

Name

Function

Torque converter regulator valve

Optimizes the supply pressure for the torque converter depending on driving conditions.

Pressure regulator valve

Optimizes the discharge pressure from the oil pump depending on driving conditions.

TCC control valve

Activates or deactivate the lock-up.

Lock-up smoothly by opening lock-up operation excessively.

TCC solenoid valve

Controls the TCC control valve or select control valve.

Shift control valve

Controls flow-in/out of line pressure from the primary pulley depending on the stroke difference between the stepping motor and the primary pulley.

Secondary valve

Controls the line pressure from the secondary pulley depending on operating conditions.

Clutch regulator valve

Adjusts the clutch operating pressure depending on operating conditions.

Secondary pressure solenoid valve

Controls the secondary valve.

Line pressure solenoid valve

Controls the line pressure control valve.

Step motor

Controls the pulley ratio.

Manual valve

Transmits the clutch operating pressure to each circuit in accordance with the selected
position.

Select control valve

Engages forward clutch, reverse brake smoothly depending on select operation.

Select switch valve

Switches torque converter clutch solenoid valve control pressure use to torque converter
clutch control valve or select control valve.

Lock-up select solenoid valve

Controls the select switch valve.

Revision: July 2007

CVT-23

2008 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

< SERVICE INFORMATION >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Introduction

INFOID:0000000001850952

The CVT system has two self-diagnostic systems.

The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. The malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in
the ECM memory, and the TCM memory.
The second is the TCM original self-diagnosis performed by the TCM. The malfunction is stored in the TCM
memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail, refer to CVT-46,
"CONSULT-III Function (TRANSMISSION)".

OBD-II Function for CVT System

INFOID:0000000001850953

The ECM provides emission-related on board diagnostic (OBD-II) functions for the CVT system. One function
is to receive a signal from the TCM used with OBD-related parts of the CVT system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (malfunction indicator lamp) on the instrument panel. Sensors, switches
and solenoid valves are used as sensing elements.
The MIL automatically illuminates in One or Two Trip Detection Logic when a malfunction is sensed in relation
to CVT system parts.

One or Two Trip Detection Logic of OBD-II

INFOID:0000000001850954

ONE TRIP DETECTION LOGIC

If a malfunction is sensed during the first test drive, the MIL will illuminate and the malfunction will be stored in
the ECM memory as a DTC. The TCM is not provided with such a memory function.

TWO TRIP DETECTION LOGIC

When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL will not illuminate. 1st trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. 2nd trip
The trip in the One or Two Trip Detection Logic means a driving mode in which self-diagnosis is performed
during vehicle operation.

OBD-II Diagnostic Trouble Code (DTC)

INFOID:0000000001850955

HOW TO READ DTC AND 1ST TRIP DTC

DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-III or
GST) CONSULT-III or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-III also displays the malfunctioning component or system.)
1st trip DTC No. is the same as DTC No.
Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. However, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring or
occurred in the past and returned to normal.
CONSULT-III can identify them as shown below, therefore, CONSULT-III (if available) is recommended.
A sample of CONSULT-III display for DTC and 1st trip DTC is shown on the next page. DTC or 1st trip DTC of
a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode for ENGINE with CONSULT-III. Time
data indicates how many times the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be 0.
If a 1st trip DTC is stored in the ECM, the time data will be 1t.
Freeze Frame Data and 1st Trip Freeze Frame Data
The ECM has a memory function, which stores the driving condition such as fuel system status, calculated
load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed and vehicle
speed at the moment the ECM detects a malfunction.
Revision: July 2007

CVT-24

2008 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

< SERVICE INFORMATION >
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data,
and the data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-III A
or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-III screen, not on the GST. For
details, refer to EC-113, "CONSULT-III Function (ENGINE)".
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
B
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
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- CVT
lowing priorities to update the data.
Priority
1

Items
Freeze frame data

2
3

Misfire DTC: P0300 - P0306

Fuel Injection System Function DTC: P0171, P0172, P0174, P0175
Except the above items (Includes CVT related items)

1st trip freeze frame data

Both 1st trip freeze frame data and freeze frame data (along with the DTC) are cleared when the ECM memory is erased.

HOW TO ERASE DTC

The diagnostic trouble code can be erased by CONSULT-III, GST or ECM DIAGNOSTIC TEST MODE as
described following.
If the battery cable is disconnected, the diagnostic trouble code will be lost within 24 hours.
When you erase the DTC, using CONSULT-III or GST is easier and quicker than switching the mode
selector on the ECM.
The following emission-related diagnostic information is cleared from the ECM memory when erasing DTC
related to OBD-II. For details, refer to EC-51, "Emission-related Diagnostic Information".
Diagnostic trouble codes (DTC)
1st trip diagnostic trouble codes (1st trip DTC)
Freeze frame data
1st trip freeze frame data
System readiness test (SRT) codes
Test values

HOW TO ERASE DTC (WITH CONSULT-III)

If a DTC is displayed for both ECM and TCM, it is necessary to be erased for both ECM and TCM.
1. Perform DELETING DTC.
2. Make sure that all "DTC RESULT", "TIME" and "FDD"are deleted.

HOW TO ERASE DTC (WITH GST)

1.
2.

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.
Select Mode 4 with GST (Generic Scan Tool). For details, refer to EC-121, "Generic Scan Tool (GST)
Function".

Malfunction Indicator Lamp (MIL)

INFOID:0000000001850956

DESCRIPTION

Revision: July 2007

CVT-25

2008 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

< SERVICE INFORMATION >
The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned ON without the engine running. This is a bulb check.
If the MIL does not light up, refer to DI-31, or see EC-519.
2. When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.

SEF217U

Revision: July 2007

CVT-26

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

DTC Inspection Priority Chart

INFOID:0000000001850957

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority B
chart.
NOTE:
If DTC U1000 CAN COMM CIRCUIT is displayed with other DTCs, first perform the trouble diagnosis
CVT
for DTC U1000 CAN COMMUNICATION LINE. Refer to CVT-54 .
Priority

Detected items (DTC)

U1000 CAN communication line

Except above

Fail-Safe

INFOID:0000000001850958

The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit.

FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, this function controls the CVT to make driving possible.
Output Speed Sensor (Secondary Speed Sensor)
The shift pattern is changed in accordance with throttle position when an unexpected signal is sent from the
output speed sensor (secondary speed sensor) to the TCM. The overdrive-off mode is inhibited, and the transaxle is put in D.
Input Speed Sensor (Primary Speed Sensor)
The shift pattern is changed in accordance with throttle position and secondary speed (vehicle speed) when
an unexpected signal is sent from the input speed sensor (primary speed sensor) to the TCM. The overdriveoff mode is inhibited, and the transaxle is put in D.
PNP Switch
If an unexpected signal is sent from the PNP switch to the TCM, the transaxle is put in D.

Manual Mode Switch (with QR25DE)

If an unexpected signal is sent from the manual mode switch to the TCM, the transaxle is put in D.
CVT Fluid Temperature Sensor
If an unexpected signal is sent from the CVT fluid temperature sensor to the TCM, the gear ratio in use before
receiving the unexpected signal is maintained or the gear ratio is controlled to keep engine speed under 4500
rpm.
Transmission Fluid Pressure Sensor A (Secondary Pressure Sensor)
If an unexpected signal is sent from the transmission fluid pressure sensor A (secondary pressure sensor) to
the TCM, the secondary pressure feedback control is stopped and the offset value obtained before the nonstandard condition occurs is used to control line pressure.
If transmission fluid pressure sensor A (secondary pressure sensor) error signal is input to TCM, secondary
pressure feedback control stops, but line pressure is controlled normally.

Pressure Control Solenoid A (Line Pressure Solenoid)

If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid A (line pressure
solenoid) is turned OFF to achieve the maximum fluid pressure.

Pressure Control Solenoid B (Secondary Pressure Solenoid)

If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid B (secondary pressure solenoid) is turned OFF to achieve the maximum fluid pressure.

Torque Converter Clutch Solenoid

If an unexpected signal is sent from the solenoid to the TCM, the torque converter clutch solenoid is turned
OFF to cancel the lock-up.
Step Motor
If an unexpected signal is sent from the step motor to the TCM, the step motor coil phases A through D are
all turned OFF to hold the gear ratio used right before the non-standard condition occurred.
Revision: July 2007

CVT-27

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
CVT Lock-up Select Solenoid
If an unexpected signal is sent from the solenoid to the TCM, the CVT lock-up select solenoid is turned OFF to
cancel the lock-up.
TCM Power Supply (Memory Back-up)
Transaxle assembly is protected by limiting the engine torque when the memory back-up power supply (for
controlling) from the battery is not supplied to TCM. Normal statues is restored when turning the ignition switch
OFF to ON after the normal power supply.

How to Perform Trouble Diagnosis for Quick and Accurate Repair

INFOID:0000000001850959

INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, PNP switch and provides shift control or lock-up
control via CVT solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
CVT system for malfunction-diagnostic purposes. The TCM is capable of diagnosing malfunctioning parts while the ECM can store malfunctions in its memory.
Input and output signals must always be correct and stable in the
operation of the CVT system. The CVT system must be in good
operating condition and be free of valve seizure, solenoid valve malfunction, etc.
SAT631IB

It is much more difficult to diagnose an error that occurs intermittently rather than continuously. Most intermittent errors are caused
by poor electric connections or improper wiring. In this case, careful
checking of suspected circuits may help prevent the replacement of
good parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-III (or GST) or a circuit tester connected should be
performed. Follow the "WORK FLOW" .

SAT632I

Before undertaking actual checks, take a few minutes to talk with a

customer who approaches with a driveability complaint. The customer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A DIAGNOSTIC WORKSHEET as
shown on the example (Refer to "Diagnostic Worksheet Chart" )
should be used.
Start your diagnosis by looking for conventional errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.

SEF234G

WORK FLOW
A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symptoms or conditions for a customer complaint.
Make good use of the two sheets provided, "Information From Customer" and "Diagnostic Worksheet Chart" ,
to perform the best troubleshooting possible.
Work Flow Chart

Revision: July 2007

CVT-28

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
A

CVT

L
SCIA6877E

*1.

"Information From Customer"

*2.

"DIAGNOSTIC WORKSHEET"

*3.

CVT-27

*4.

CVT-35

*5.

CVT-35, CVT-35

*6.

CVT-38

*7.

CVT-46

*8.

CVT-24

*9.

CVT-27

*10. CVT-54

*11. CVT-142

*12. CVT-150

*13. CVT-24

*14. CVT-54

*15. CVT-142

*16. EC-51

DIAGNOSTIC WORKSHEET
Information From Customer

P
KEY POINTS

WHAT..... Vehicle & CVT model

WHEN..... Date, Frequencies
WHERE..... Road conditions
HOW..... Operating conditions, Symptoms

Revision: July 2007

CVT-29

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Customer name

MR/MS

Model & Year

VIN

Trans. Model

Engine

Mileage

malfunction Date

Manuf. Date

In Service Date

Frequency

Continuous

Symptoms

Vehicle does not move. ( Any position

Intermittent (

times a day)
Particular position)

No shift
Lock-up malfunction
Shift shock or slip

( N D

NR

Lock-up Any drive position)

Noise or vibration
No pattern select
Others
(
Malfunction indicator lamp (MIL)

Continuously lit

Not lit

Diagnostic Worksheet Chart

1

Read the item on cautions concerning fail-safe and understand the customer's complaint.

CVT-27

CVT fluid inspection

Leak (Repair leak location.)
State
Amount

CVT-35

Stall test and line pressure test

Stall test
3

Torque converter one-way clutch

Reverse brake
Forward clutch
Steel belt

Engine
Line pressure low
Primary pulley
Secondary pulley

CVT-35,
CVT-35

Line pressure inspection - Suspected part:

Revision: July 2007

CVT-30

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Perform road test.

CVT-38

Check before engine is started

CVT-39

CVT-153, "O/D OFF Indicator Lamp Does Not Come On"

Perform self-diagnosis. Enter checks for detected items. CVT-46

4-1.

CVT-54
CVT-57
CVT-58
CVT-60
CVT-65
CVT-70
CVT-75
CVT-80
CVT-82
CVT-83
CVT-88
CVT-90
CVT-95
CVT-97
CVT-99
CVT-104
CVT-109
CVT-113
CVT-115
CVT-119
CVT-121
CVT-125
CVT-127
CVT-129
CVT-131
CVT-132
CVT-138
CVT-142

CVT

Check at idle

4-2.

CVT-39

CVT-155, "Engine Cannot Be Started in "P" or "N" Position"

CVT-155, "In "P" Position, Vehicle Moves Forward or Backward When Pushed"
CVT-156, "In "N" Position, Vehicle Moves"
CVT-156, "Large Shock "N" "R" Position"
CVT-157, "Vehicle Does Not Creep Backward in "R" Position"
CVT-158, "Vehicle Does Not Creep Forward in "D" or "L" Position"

Revision: July 2007

CVT-31

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Cruise test

CVT-41

CVT-159, "Vehicle Speed Does Not Change in "L" Position"

CVT-160, "Vehicle Speed Does Not Change in overdrive-off mode"
CVT-161, "Vehicle Speed Does Not Change in "D" Position"
CVT-161, "Cannot Be Changed to Manual Mode"
CVT-162, "CVT Does Not Shift in Manual Mode"
CVT-163, "Vehicle Does Not Decelerate by Engine Brake"
perform self-diagnosis. Enter checks for detected items. CVT-46
CVT-54
CVT-57
CVT-58
CVT-60
CVT-65
CVT-70
CVT-75
CVT-80
CVT-82
CVT-83
CVT-88
CVT-90
CVT-95
CVT-97
CVT-99
CVT-104
CVT-109
CVT-113
CVT-115
CVT-119
CVT-121
CVT-125
CVT-127
CVT-129
CVT-131
CVT-132
CVT-138
CVT-142

4-3.

Inspect each system for items found to be NG in the self-diagnosis and repair or replace the malfunctioning parts.

Perform all road tests and enter the checks again for the required items.

For any remaining NG items, perform the diagnosis procedure and repair or replace the malfunctioning parts.

Erase the results of the self-diagnosis from the TCM.

Revision: July 2007

CVT-32

CVT-38

CVT-24,
CVT-24

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >

CVT Electrical Parts Location

INFOID:0000000001850960

CVT

P
AWDIA0234ZZ

: Front
1.

Overdrive indicator lamp

2.

Manual mode indicator (with

QR25DE)

3.

Shift position indicator

4.

Accelerator pedal position (APP)

sensor

5.

Secondary speed sensor

6.

Primary speed sensor

Revision: July 2007

CVT-33

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
7.

CVT unit harness connector

PNP switch

9.

TCM (with MR20DE)

10. Battery

11. Battery

12. TCM (with QR25DE)

13. Steering shift switch (with QR25DE)

14. Overdrive OFF switch

15. Manual mode switch (with QR25DE)

Circuit Diagram

INFOID:0000000001850961

AWDWA0007GB

Revision: July 2007

CVT-34

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >

Inspections before Trouble Diagnosis

INFOID:0000000001850962

CVT FLUID CHECK

Fluid Leakage and Fluid Level Check
Inspect for fluid leakage and check the fluid level. Refer to CVT-14, "Checking CVT Fluid" .

Fluid Condition Check

Inspect the fluid condition.
Fluid status

Conceivable cause

CVT
Required operation

Clutch, brake
scorched

Replace the CVT fluid and check the

CVT main unit and the vehicle for
malfunctions (wire harnesses, cooler pipes, etc.)

Milky white or
cloudy

Water in the fluid

Replace the CVT fluid and check for

places where water is getting in.

Large amount of
metal powder mixed
in

Unusual wear of
sliding parts within
CVT

Replace the CVT fluid and check for

improper operation of the CVT.

Varnished (viscous
varnish state)

F
SAT638A

STALL TEST

Stall Test Procedure

1.
2.

Inspect the amount of engine oil. Replenish the engine oil if necessary.
Drive for about 10 minutes to warm up the vehicle so that the
CVT fluid temperature is 50 to 80C (122 to 176F). Inspect the
amount of CVT fluid. Replenish if necessary.

K
SAT647B

3.
4.

Securely engage the parking brake so that the tires do not turn.
Install a tachometer where it can be seen by driver during test.
It is good practice to mark the point of specified engine
rpm on indicator.

SAT513G

Revision: July 2007

CVT-35

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
5. Start engine, apply foot brake, and place selector lever in D
position.

SAT775B

6.
7.

While holding down the foot brake, gradually press down the
accelerator pedal.
Quickly read off the stall speed, and then quickly remove your
foot from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 seconds during this test.
Stall speed:
Stall speed:

2,500 - 3,000 rpm (with MR20DE)

2,050 - 3,550 rpm (with QR25DE)
SAT514G

8.
9.

Move the selector lever to the N position.

Cool down the CVT fluid.
CAUTION:
Run the engine at idle for at least 1 minute.
10. Repeat steps 6 through 9 with selector lever in R position.

SAT771B

Judgment Stall Test

Selector lever position

Expected problem location

D, L

Forward clutch

Reverse brake

Engine and torque converter one-way clutch

Stall rotation
H

Line pressure low

Primary pulley
Secondary pulley
Steel belt

O: Stall speed within standard value position.

H: Stall speed is higher than standard value.
L: Stall speed is lower than standard value.

LINE PRESSURE TEST

Line Pressure Test Port

Revision: July 2007

CVT-36

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
(A): Line pressure Test Port.

CVT
SCIA6591J

Line Pressure Test Procedure

1.
2.

3.

4.

Inspect the amount of engine oil and replenish if necessary.

Drive the car for about 10 minutes to warm it up so that the CVT fluid reaches in the range of 50 to 80C
(122 to 176F), then inspect the amount of CVT fluid and replenish if necessary.
NOTE:
The CVT fluid temperature rises in the range of 50 - 80C (122 - 176F) during 10 minutes of driving.
After warming up CVT, remove the oil pressure detection plug and install the oil pressure gauge [special
service tool: - (OTC3492)]
CAUTION:
When using the oil pressure gauge, be sure to use the O-ring attached to the oil pressure detection plug.
Securely engage the parking brake so that the tires do not turn.

SAT513G

5.

6.

Start the engine, and then measure the line pressure at both idle
and the stall speed.
CAUTION:
Keep the brake pedal pressed all the way down during
measurement.
When measuring the line pressure at the stall speed, refer
to "STALL TEST" .
After the measurements are complete, install the oil pressure
detection plug and tighten to the specified torque below.

: 7.5 Nm (0.77 kg-m, 66 in-lb)

SAT493G

CAUTION:
Do not reuse O-ring.
Apply CVT fluid to O-ring.

Line Pressure

Engine speed

Line pressure

kPa (kg/cm2, psi)

R, D , L positions
At idle

750 (7.65, 108.8)

At stall

5,700 (58.14, 826.5)*

*: Reference values

Revision: July 2007

CVT-37

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Judgment of Line Pressure Test
Judgment

Idle speed

Possible cause

Low for all positions

(P, R, N, D, L)

Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
Oil pump wear
Pressure regulator valve or plug sticking or spring fatigue
Oil strainer oil pump pressure regulator valve passage oil leak
Engine idle speed too low

Only low for a specific

position

Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.

High

Possible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example
Accelerator pedal position signal malfunction
CVT fluid temperature sensor malfunction
Pressure control solenoid A (line pressure solenoid) malfunction (sticking in OFF state, filter
clog, cut line)
Pressure regulator valve or plug sticking

Line pressure does

not rise higher than
the line pressure for
idle.

Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example
Accelerator pedal position signal malfunction
TCM malfunction
Pressure control solenoid A (line pressure solenoid) malfunction (shorting, sticking in ON
state)
Pressure regulator valve or plug sticking

The pressure rises,

but does not enter the
standard position.

Possible causes include malfunctions in the pressure supply system and malfunction in the pressure adjustment function.
For example
Accelerator pedal position signal malfunction
Pressure control solenoid A (line pressure solenoid) malfunction (sticking, filter clog)
Pressure regulator valve or plug sticking

Only low for a specific

position

Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.

Stall speed

Road Test

INFOID:0000000001850963

DESCRIPTION
The purpose of the test is to determine overall performance of CVT
and analyze causes of problems.
The road test consists of the following three parts:
1. Check Before Engine Is Started CVT-39 .
2. Check at Idle CVT-39 .
3. Cruise Test CVT-41 .

SAT786A

Revision: July 2007

CVT-38

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Before road test, familiarize yourself with all test procedures and
items to check.
Perform tests on all items until specified symptom is found. Troubleshoot items which check out No Good after road test.

CVT
SAT496G

CONSULT-III OPERATION PROCEDURE

CAUTION:
If CONSULT-III is used with no connection of CONSULT-III CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which performs CAN communication.
Using CONSULT-III, perform a cruise test and record the result.
Print the result and ensure that shifts and lock-ups take place as per Shift Schedule.
1. Touch DATA MONITOR on SELECT DIAG MODE screen.
2.
3.
4.

Touch MAIN SIGNALS to set recording condition.

See Numerical Display, Barchart Display or Line Graph Display.
Touch START.

5.
6.
7.
8.
9.
10.
11.

When performing cruise test. Refer to CVT-41, "Cruise Test" .

After finishing cruise test part, touch RECORD.
Touch STORE.
Touch BACK.
Touch DISPLAY.
Touch PRINT.
Check the monitor data printed out.

Check before Engine Is Started

J
INFOID:0000000001850964

1.CHECK O/D OFF INDICATOR LAMP

1. Park vehicle on flat surface.
2. Move selector lever to P position.
3. Turn ignition switch OFF. Wait at least 5 seconds.
4. Turn ignition switch ON. (Do not start engine.)
Does O/D OFF indicator lamp come on for about 2 seconds?
YES >> 1. Turn ignition switch OFF.
2. Perform self-diagnosis and note NG items.
Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)" .
3. Go to CVT-39, "Check at Idle" .
NO
>> Stop Road Test. Go to CVT-153, "O/D OFF Indicator Lamp Does Not Come On" .

Check at Idle

INFOID:0000000001850965

1.CHECK STARTING THE ENGINE

1. Park vehicle on flat surface.
2. Move selector lever to P or N position.
3. Turn ignition switch OFF.
4. Turn ignition switch START.
Is engine started?
YES >> GO TO 2.

Revision: July 2007

CVT-39

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
NO
>> Stop Road Test. Mark the box on the CVT-155, "Engine Cannot Be Started in "P" or "N" Position"
on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Go to CVT155, "Engine Cannot Be Started in "P" or "N" Position".

2.CHECK STARTING THE ENGINE

1. Turn ignition switch ON.
2. Move selector lever to R, D or L position.
3. Turn ignition switch START.
Is engine started?
YES >> Stop Road Test. Mark the box on the CVT-155, "Engine Cannot Be Started in "P" or "N" Position"
on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Go to CVT155, "Engine Cannot Be Started in "P" or "N" Position".
NO
>> GO TO 3.

3.CHECK P POSITION FUNCTION

1. Move selector lever to P position.
2. Turn ignition switch OFF.
3. Release parking brake.
4. Push vehicle forward or backward.
5. Apply parking brake.
Does vehicle move when it is pushed forward or backward?
YES >> Mark the box CVT-155, "In "P" Position, Vehicle Moves Forward or Backward When Pushed" on
the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Continue Road
Test.
NO
>> GO TO 4.

4.CHECK N POSITION FUNCTION

1. Start engine.
2. Move selector lever to N position.
3. Release parking brake.
Does vehicle move forward or backward?
YES >> Mark the box CVT-156, "In "N" Position, Vehicle Moves" on the CVT-28, "How to Perform Trouble
Diagnosis for Quick and Accurate Repair". Continue Road Test.
NO
>> GO TO 5.

5.CHECK SHIFT SHOCK

1. Apply foot brake.
2. Move selector lever to R position.
Is there large shock when changing from N to R position?
YES >> Mark the box CVT-156, "Large Shock "N" "R" Position" on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Continue Road Test.
NO
>> GO TO 6.

6.CHECK R POSITION FUNCTION

Release foot brake for several seconds.
Does vehicle creep backward when foot brake is released?
YES >> GO TO 7.
NO
>> Mark the box CVT-157, "Vehicle Does Not Creep Backward in "R" Position" on the CVT-28, "How
to Perform Trouble Diagnosis for Quick and Accurate Repair". Continue Road Test.

7.CHECK D, L POSITIONS FUNCTION

Move selector lever to D and L positions and check if vehicle creeps forward.
Does vehicle creep forward in all positions?
YES >> Go to CVT-41, "Cruise Test".
NO
>> Stop Road Test. Mark the box CVT-158, "Vehicle Does Not Creep Forward in "D" or "L" Position"
on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Go to CVT158, "Vehicle Does Not Creep Forward in "D" or "L" Position".

Revision: July 2007

CVT-40

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >

Cruise Test

INFOID:0000000001850966

1.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 1

1.

Drive vehicle for approximately 10 minutes to warm engine oil and CVT fluid up to operating temperature.
CVT fluid operating temperature:

2.
3.
4.
5.
6.

50 - 80C (122 - 176F)

Park vehicle on flat surface.

Move selector lever to P position.
Start engine.
Move selector lever to L position.
Accelerate vehicle to 2/8-way throttle depressing accelerator
pedal constantly.

CVT

Read vehicle speed and engine speed. Refer to CVT-43,

"Vehicle Speed When Shifting Gears" .
OK or NG
OK
>> GO TO 2.
NG
>> Mark the box CVT-159, "Vehicle Speed Does Not
Change in "L" Position" on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" .
Continue Road Test.

SCIA6644E

2.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 2

1.
2.
3.

Park vehicle on flat surface.

Move selector lever to D position.
Accelerate vehicle to full depression depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-43,
"Vehicle Speed When Shifting Gears".
OK or NG
OK
>> GO TO 3. (With manual mode)
OK
>> GO TO 7. (Without manual mode)
NG
>> Mark the box CVT-162, "CVT Does Not Shift in Manual
Mode" on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Continue Road
Test.

K
SCIA4366E

3.CHECK MANUAL MODE FUNCTION

Move to manual mode from "D" position.

Does it switch to manual mode?
YES >> GO TO 4.
NO
>> Mark the box CVT-161, "Cannot Be Changed to Manual Mode" on the CVT-28, "How to Perform
Trouble Diagnosis for Quick and Accurate Repair" . Continue Road Test.

4.CHECK SHIFT-UP FUNCTION

During manual mode driving, is upshift from M1 M2 M3 M4 M5 M6 performed?
Read the gear position. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is upshifting correctly performed?
YES >> GO TO 5.
NO
>> Mark the box CVT-162, "CVT Does Not Shift in Manual Mode" on the CVT-28, "How to Perform
Trouble Diagnosis for Quick and Accurate Repair" . Continue Road Test.

5.CHECK SHIFT-DOWN FUNCTION

During manual mode driving, is downshift from M6 M5 M4 M3 M2 M1 performed?
Read the gear position. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is downshifting correctly performed?
Revision: July 2007

CVT-41

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
YES >> GO TO 6.
NO
>> Mark the box CVT-162, "CVT Does Not Shift in Manual Mode" on the CVT-28, "How to Perform
Trouble Diagnosis for Quick and Accurate Repair" . Continue Road Test.

6.CHECK ENGINE BRAKE FUNCTION

Check engine brake.
Does engine braking effectively reduce speed in M1 position?
YES >> 1. Stop the vehicle.
2. Perform self-diagnosis. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> Mark the box of CVT-163, "Vehicle Does Not Decelerate by Engine Brake" on the CVT-28, "How
to Perform Trouble Diagnosis for Quick and Accurate Repair". Then continue trouble diagnosis.

7.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 2

1.
2.
3.
4.

Park vehicle on flat surface.

Move selector lever to D position.
Push overdrive control switch. (O/D OFF indicator lamp is on.)
Accelerate vehicle to 2/8-way throttle depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-43,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK
>> GO TO 8.
NG
>> Mark the box CVT-160, "Vehicle Speed Does Not
Change in overdrive-off mode" on the CVT-28, "How to
Perform Trouble Diagnosis for Quick and Accurate
Repair" . Continue Road Test.
SCIA6644E

8.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 3

1.
2.
3.
4.

Park vehicle on flat surface.

Move selector lever to D position.
Push overdrive control switch. (O/D OFF indicator lamp is off.)
Accelerate vehicle to 2/8 way throttle depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-43,
"Vehicle Speed When Shifting Gears".
OK or NG
OK
>> GO TO 9.
NG
>> Mark the box CVT-161, "Vehicle Speed Does Not
Change in "D" Position" on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" .
Continue Road Test.
SCIA6644E

9.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 4

1.
2.
3.

Park vehicle on flat surface.

Move selector lever to L position.
Accelerate vehicle to full depression depressing accelerator
pedal constantly.

Read vehicle speed and engine speed. Refer to CVT-43,

"Vehicle Speed When Shifting Gears" .
OK or NG
OK
>> GO TO 10.
NG
>> Mark the box CVT-159, "Vehicle Speed Does Not
Change in "L" Position" on the CVT-28, "How to Perform
Trouble Diagnosis for Quick and Accurate Repair" .
Continue Road Test.
SCIA4366E

10.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 5

Revision: July 2007

CVT-42

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
1. Park vehicle on flat surface.
2. Move selector lever to D position.
3. Push overdrive control switch. (O/D OFF indicator lamp is on.)
4. Accelerate vehicle to full depression depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-43,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK
>> GO TO 11.
NG
>> Mark the box CVT-160, "Vehicle Speed Does Not
Change in overdrive-off mode" on the CVT-28, "How to
Perform Trouble Diagnosis for Quick and Accurate
Repair" . Continue Road Test.

CVT

D
SCIA4366E

11.CHECK VEHICLE SPEED WHEN SHIFTING GEARS PART 6

1.
2.
3.
4.

Park vehicle on flat surface.

Move selector lever to D position.
Push overdrive control switch. (O/D OFF indicator lamp is off.)
Accelerate vehicle to full depression depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-43,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK
>> GO TO 12.
NG
>> Mark the box CVT-161, "Vehicle Speed Does Not
Change in "D" Position" on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" .
Continue Road Test.

I
SCIA4366E

12.CHECK ENGINE BRAKE FUNCTION PART 1

1. Release accelerator pedal.
2. Check engine brake. (O/D OFF indicator lamp is off.)
Does engine braking effectively reduce speed in D position?
YES >> GO TO 13.
NO
>> Mark the box CVT-163, "Vehicle Does Not Decelerate by Engine Brake" on the CVT-28, "How to
Perform Trouble Diagnosis for Quick and Accurate Repair". Continue Road Test.

13.CHECK ENGINE BRAKE FUNCTION PART 2

1. Push overdrive control switch. (O/D OFF indicator lamp is on.)
2. Check engine brake.
Does engine braking effectively reduce speed in D position?
YES >> GO TO 14.
NO
>> Mark the box CVT-163, "Vehicle Does Not Decelerate by Engine Brake" on the CVT-28, "How to
Perform Trouble Diagnosis for Quick and Accurate Repair" . Continue Road Test.

14.CHECK ENGINE BRAKE FUNCTION PART 3

1. Move selector lever to L position.
2. Check engine brake.
Does engine braking effectively reduce speed in L position?
YES >> 1. Stop the vehicle.
2. Perform self-diagnosis. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)" .
NO
>> Mark the box CVT-163, "Vehicle Does Not Decelerate by Engine Brake" on the CVT-28, "How to
Perform Trouble Diagnosis for Quick and Accurate Repair" . Then continue trouble diagnosis.

Vehicle Speed When Shifting Gears

INFOID:0000000001850967

Numerical value data are reference values.

Revision: July 2007

CVT-43

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Engine type

Throttle position

Engine speed (rpm)

Shift pattern

At 40 km/h (25 MPH)

At 60 km/h (37 MPH)

3,300 - 4,200

4,300 - 5,200

D position

1,300 - 3,100

1,400 - 3,400

Overdrive-off mode

2,200 - 3,000

2,800 - 3,600

L position

3,200 - 4,100

4,100 - 4,900

3,400 - 4,200

4,300 - 5,100

1,400 - 2,200

1,600 - 2,400

D position
8/8

Overdrive-off mode
L position

QR25DE
2/8

D position
8/8

Overdrive-off mode
L position

MR20DE

D position
2/8

Overdrive-off mode

2,200 - 3,000

2,800 - 3,600

L position

3,600 - 4,400

4,100 - 4,900

CAUTION:
Lock-up clutch is engaged when vehicle speed is approximately 18 km/h (11 MPH) to 90 km/h (56 MPH).

TCM Input/Output Signal Reference Value

INFOID:0000000001850968

TCM HARNESS CONNECTOR TERMINAL LAYOUT

WCIA0718E

TERMINALS AND REFERENCE VALUES FOR TCM

Data are reference values and are measured between each terminal and ground.

Terminal

Wire
color

W/B

PNP switch R
position

Selector lever in R position.

P/B

PNP switch N
position

Selector lever in N position

G/O

PNP switch D
position

Selector lever in D position

PNP switch L
position

Selector lever in L position

Item

Condition

When setting selector lever to other positions

When setting selector lever to other positions

When setting selector lever to other positions

Data (Approx.)
Battery voltage
0V
Battery voltage
0V
Battery voltage
0V
Battery voltage

GR

Ground

Always

0V

P/L

K-LINE

W/R

Sensor ground

Always

0V

G/W

ROM assembly

L/R

ROM assembly

10

BR/R

ROM assembly

Revision: July 2007

When setting selector lever to other positions

CVT-44

0V

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Terminal

Wire
color

11

BR/W

13

14

15

25

LG

V/W

W/R

Item

Condition
Selector lever in P position

PNP switch P
position

CVT fluid temperature sensor

Transmission
fluid pressure
sensor B (Primary pressure sensor)

Transmission
fluid pressure
sensor A (Secondary pressure
sensor)

Data (Approx.)

L/O

Battery voltage

When setting selector lever to other positions

0V

When CVT fluid temperature is 20C (68F)

2.0 V

When CVT fluid temperature is 80C (176F)

1.0 V

CVT

D
and

N position idle

0.7 - 3.5 V

F
and

N position idle

1.0 V

Sensor ground

Always

0V

26

5.0 V

Sensor power

0V

J
Within 2 seconds after ignition switch ON, the time measurement by using
the pulse width measurement function (Hi level) of CONSULT-III.*1
CAUTION:
Connect the diagnosis data link cable to the vehicle diagnosis connector.
*1: A circuit tester cannot be used to test this item.

10.0 msec

CAN-L

CAN-H

27

R/G

Step motor D

28

Step motor C

29

O/B

Step motor B

30

G/R

Step motor A

31

32

33

LG/R

Input speed sensor (Primary

speed sensor)

When driving [L position, 20 km/h (12 MPH)].

890 Hz

34

Output speed
sensor (Secondary speed sensor)

When driving [D position, 20 km/h (12 MPH)].

460 Hz

37

L/W

38

Revision: July 2007

Lock-up select
solenoid valve
Torque converter
clutch solenoid
valve

Selector lever in P or N positions

Wait at least for 5 seconds with the selector lever in
R, D or L positions
When vehicle cruises in
D position.

CVT-45

30.0 msec
10.0 msec

30.0 msec

Battery voltage

0V

When CVT performs lock-up.

6.0 V

When CVT does not perform lock-up.

1.5 V

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Wire
color

Item

W/G

Pressure control
solenoid valve B
(Secondary
pressure solenoid valve)

40

R/Y

Pressure control
solenoid valve A
(Line pressure
solenoid valve)

42

45

Y/R

Terminal

39

46

47

Y/R

48

Condition

Data (Approx.)

Release your foot from the accelerator pedal.

5.0 - 7.0 V

Press the accelerator pedal all the way down.

3.0 - 4.0 V

Release your foot from the accelerator pedal.

5.0 - 7.0 V

Press the accelerator pedal all the way down.

1.0 V

and

Ground

Always

0V

Power supply
(memory backup)

Always

Battery voltage

Battery voltage

0V

Power supply

Power supply
(memory backup)

Always

Battery voltage

Battery voltage

0V

Power supply

CONSULT-III Function (TRANSMISSION)

INFOID:0000000001850969

CONSULT-III can display each diagnostic item using the diagnostic test modes shown below.

FUNCTION
Diagnostic test mode

Function

Work support

This mode enables a technician to adjust some devices faster and more accurately by following
the indications on CONSULT-III.

Self-diagnostic results

Self-diagnostic results can be read and erased quickly.

Data monitor

Input/Output data in the TCM can be read.

CAN diagnostic support monitor

The results of transmit/receive diagnosis of CAN communication can be read.

CALIB data

Characteristic information for TCM and CVT assembly can be read.

Function test

Performed by CONSULT-III instead of a technician to determine whether each system is OK or

NG.

ECU part number

TCM part number can be read.

CONSULT-III REFERENCE VALUE

Item name

Condition

Display value (Approx.)

During driving

Approximately matches the speedometer

reading.

PRI SPEED SEN

During driving (lock-up ON)

Approximately matches the engine speed.

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

VSP SENSOR
ESTM VSP SIG

Revision: July 2007

CVT-46

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Item name

Condition

Display value (Approx.)

SEC HYDR SEN

N position idle

1.0 V

PRI HYDR SEN

N position idle

0.7 - 3.5 V

When CVT fluid temperature is 20C (68F)

2.0 V

ATF TEMP SEN

When CVT fluid temperature is 80C (176F)

1.0 V

VIGN SEN

Ignition switch: ON

Battery voltage

VEHICLE SPEED

During driving

Approximately matches the speedometer

reading.

PRI SPEED

During driving (lock-up ON)

Approximately matches the engine speed.

SEC SPEED

During driving

45 X Approximately matches the speedometer reading.

ENG SPEED

Engine running

Closely matches the tachometer reading.

GEAR RATIO

During driving

2.34 - 0.39

ACC PEDAL OPEN

Released accelerator pedal - Fully depressed

accelerator pedal

0.0/8 - 8.0/8

SEC PRESS
PRI PRESS
STM STEP
ISOLT1

ISOLT2
ISOLT3
SOLMON1

SOLMON2

SOLMON3

P POSITION SW

R POSITION SW

N POSITION SW

D POSITION SW

L POSITION SW

BRAKE SW

FULL SW

IDLE SW

Revision: July 2007

CVT

F
1.3 MPa

N position idle

0.6 - 0.8 MPa

During driving

0 step 177 step

Lock-up OFF

0.0 A

Lock-up ON

0.7 A

Release your foot from the accelerator pedal.

0.8 A

Press the accelerator pedal all the way down.

0.0 A

Secondary pressure low - Secondary pressure

high

0.8 - 0.0 A

Lock-up OFF

0.0 A

Lock-up ON

0.7 A

N position idle

0.8 A

When stalled

0.3 - 0.6 A

N position idle

0.6 - 0.7 A

When stalled

0.4 - 0.6 A

Selector lever in P position

ON

When setting selector lever to other positions.

OFF

Selector lever in R position

ON

When setting selector lever to other positions.

OFF

Selector lever in N position

ON

When setting selector lever to other positions.

OFF

Selector lever in D position

ON

When setting selector lever to other positions.

OFF

Selector lever in L position

ON

When setting selector lever to other positions.

OFF

Depressed brake pedal

ON

Released brake pedal

OFF

Fully depressed accelerator pedal

ON

Released accelerator pedal

OFF

Released accelerator pedal

ON

Fully depressed accelerator pedal

OFF

CVT-47

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Item name
SPORT MODE SW

INDLRNG

INDDRNG

INDNRNG

INDRRNG

INDPRNG

SPORT MODE IND

Condition

Display value (Approx.)

When OD OFF indicator lamp is off.

ON

When OD OFF indicator lamp is on.

OFF

Selector lever in L position

ON

When setting selector lever to other positions.

OFF

Selector lever in D position

ON

When setting selector lever to other positions.

OFF

Selector lever in N position

ON

When setting selector lever to other positions.

OFF

Selector lever in R position

ON

When setting selector lever to other positions.

OFF

Selector lever in P position

ON

When setting selector lever to other positions.

OFF

When sport mode

ON

Other conditions

OFF

During driving

Changes ON OFF.

Selector lever in P, N positions

ON

Wait at least for 5 seconds with the selector lever

in R, D or L position

OFF

Selector lever in P, N positions

ON

Wait at least for 5 seconds with the selector lever

in R, D or L position

OFF

ABS operate

ON

Other conditions

OFF

Selector lever in N or P position

NP

Selector lever in R position

Selector lever in D position

Selector lever in L position

SMCOIL D
SMCOIL C
SMCOIL B
SMCOIL A
LUSEL SOL OUT

LUSEL SOL MON

ABS ON

RANGE

WORK SUPPORT MODE

Display Item List
Item name

Description

ENGINE BRAKE ADJ.

The engine brake level setting can be canceled.

CONFORM CVTF DETERIORTN

The CVT fluid deterioration level can be checked.

Engine Brake Adjustment

ENGINE BRAKE LEVEL

0: Initial set value (Engine brake level control is activated)
OFF: Engine brake level control is deactivated.
CAUTION:
Mode of +10-1-2OFF can be selected by pressing the UPDOWN on CONSULT-III screen.
However, do not select mode other than 0 and OFF. If the +1 or -1 or -2 is selected, that
might cause the irregular driveability.
Revision: July 2007

CVT-48

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Check CVT Fluid Deterioration Date
A

CVTF DETERIORATION DATE

More than 210000:
It is necessary to change CVT fluid.
Less than 210000:
It is not necessary to change CVT fluid.

CVT

CAUTION:
Touch CLEAR after changing CVT fluid, and then erase CVTF DETERIORATION DATE.
D

SELF-DIAGNOSTIC RESULT MODE

After performing self-diagnosis, place check marks for results on the CVT-28, "How to Perform Trouble Diagnosis for Quick and Accurate Repair". Reference pages are provided following the items.

Display Items List

X: Applicable

Items (CONSULTIII screen terms)

Malfunction is detected when...

: Not applicable

TCM self-diagnosis

OBD-II (DTC)

TRANSMISSION with
CONSULT-III

MIL*1, ENGINE with

CONSULT-III
or GST

Reference
page

U1000

CVT-54

CAN COMM CIRCUIT

When TCM is not transmitting or receiving CAN communication signal for 2 seconds or more

U1000

CONTROL
UNIT(CAN)

When detecting error during the initial diagnosis of CAN controller of TCM

U1010

U1010

CVT-57

BRAKE SW/CIRC

When the brake switch does not switch to ON or OFF

P0703

CVT-58

PNP SW/CIRC

TCM does not receive the correct voltage signal (based on

the gear position) from the switch.

P0705

P0705

CVT-60

ATF TEMP SEN/

CIRC

During running, the CVT fluid temperature sensor signal voltage is excessively high or low

P0710

P0710

CVT-65

INPUT SPD SEN/

CIRC

Input speed sensor (primary speed sensor) signal is not input due to an open circuit
An unexpected signal is input when vehicle is being driven

P0715

P0715

CVT-70

VEH SPD SEN/

CIR AT

Signal from vehicle speed sensor CVT [Output speed sensor (Secondary speed sensor)] not input due to open or
short circuit
Unexpected signal input during running

P0720

P0720

CVT-75

ENGINE SPEED
SIG

TCM does not receive the CAN communication signal from

the ECM
Engine speed is too low while driving

P0725

CVT-80

BELT DAMG

Unexpected gear ratio detected

P0730

CVT-82

TCC SOLENOID/
CIRC

Normal voltage not applied to solenoid due to open or short

circuit

P0740

P0740

CVT-83

A/T TCC S/V

FNCTN

CVT cannot perform lock-up even if electrical circuit is good

TCM detects as irregular by comparing difference value
with slip rotation
There is big difference engine speed and primary speed
when TCM lock-up signal is on

P0744

P0744

CVT-88

L/PRESS SOL/
CIRC

Normal voltage not applied to solenoid due to open or short

circuit
TCM detects as irregular by comparing target value with
monitor value

P0745

P0745

CVT-90

PRS CNT SOL/A

FCTN

Unexpected gear ratio was detected in the LOW side due to

excessively low line pressure

P0746

P0746

CVT-95

PRS CNT SOL/B

FCTN

Secondary pressure is too high or too low compared with the

commanded value while driving

P0776

P0776

CVT-97

Revision: July 2007

CVT-49

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >

Items (CONSULTIII screen terms)

Malfunction is detected when...

TCM self-diagnosis

OBD-II (DTC)

TRANSMISSION with
CONSULT-III

MIL*1, ENGINE with

CONSULT-III
or GST

Reference
page

PRS CNT SOL/B

CIRC

Normal voltage not applied to solenoid due to cut line,

short, or the like
TCM detects as irregular by comparing target value with
monitor value

P0778

P0778

CVT-99

MANUAL MODE
SWITCH

When an impossible pattern of switch signals is detected, a

malfunction is detected.

P0826

CVT-104

TR PRS SENS/A
CIRC

Signal voltage of the transmission fluid pressure sensor A

(secondary pressure sensor) is too high or too low while driving

P0840

P0840

CVT-109

PRESS SEN/
FNCTN

Correlation between the values of the transmission fluid pressure sensor A (secondary pressure sensor) and the transmission fluid pressure sensor B (primary pressure sensor) is out
of specification

P0841

CVT-113

TR PRS SENS/B
CIRC

Signal voltage of the transmission fluid pressure sensor B

(primary pressure sensor) is too high or too low while driving

P0845

P0845

CVT-115

SEC/PRESS
DOWN

Secondary fluid pressure is too low compared with the commanded value while driving

P0868

CVT-119

TCM-POWER
SUPPLY

When the power supply to the TCM is cut OFF, for example
because the battery is removed, and the self-diagnosis
memory function stops
This is not a malfunction message (Whenever shutting
OFF a power supply to the TCM, this message appears on
the screen)

P1701

CVT-121

TP SEN/CIRC A/T

TCM does not receive the proper accelerator pedal position

signals (input by CAN communication) from ECM

P1705

CVT-125

ESTM VEH SPD

SIG*2

CAN communication with the ABS actuator and the electric

unit (control unit) is malfunctioning
There is a great difference between the vehicle speed signal from the ABS actuator and the electric unit (control
unit), and the vehicle speed sensor signal

P1722

CVT-127

CVT SPD SEN/

FNCTN

A rotation sensor error is detected because the gear does not

change in accordance with the position of the stepping motor
CAUTION:
One of the P0720 VEH SPD SEN/CIR AT, the P0715 INPUT SPD SEN/CIRC or the P0725 ENGINE SPEED SIG
is displayed with the DTC at the same time

P1723

CVT-129

ELEC TH CONTROL

The electronically controlled throttle for ECM is malfunctioning

P1726

CVT-131

LU-SLCT SOL/
CIRC

Normal voltage not applied to solenoid due to cut line,

short, or the like
TCM detects as irregular by comparing target value with
monitor value

P1740

P1740

CVT-132

L/PRESS CONTROL

TCM detects the unexpected line pressure

P1745

CVT-137

STEP MOTR CIRC

Each coil of the step motor is not energized properly due to

an open or a short

P1777

P1777

CVT-138

STEP MOTR/FNC

There is a great difference between the number of steps for

the stepping motor and for the actual gear ratio

P1778

P1778

CVT-142

NO DTC IS DETECTED: FURTHER TESTING

MAY BE REQUIRED

No NG item has been detected

Revision: July 2007

CVT-50

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
*1: Refer to CVT-25, "Malfunction Indicator Lamp (MIL)" .

*2: Models without ABS does not indicate.

DATA MONITOR MODE

Display Items List

B
X: Standard, : Not applicable,

: Option

Monitor item selection

SELECTION
FROM
MENU

CVT

ECU INPUT SIGNALS

MAIN SIGNALS

VSP SENSOR (km/h)

Output speed sensor (secondary speed sensor)

ESTM VSP SIG (km/h)

Models without ABS dose not indicate

PRI SPEED SEN (rpm)

ENG SPEED SIG (rpm)

SEC HYDR SEN (V)

PRI HYDR SEN (V)

ATF TEMP SEN (V)

VIGN SEN (V)

VEHICLE SPEED (km/h)

PRI SPEED (rpm)

Monitored item (Unit)

Remarks

CVT fluid temperature sensor

Vehicle speed recognized by the TCM

Primary pulley speed

SEC SPEED (rpm)

Secondary pulley speed

ENG SPEED (rpm)

SLIP REV (rpm)

Difference between engine speed and primary

pulley speed

GEAR RATIO

G SPEED (G)

ACC PEDAL OPEN (0.0/8)

TRQ RTO

SEC PRESS (MPa)

PRI PRESS (MPa)

ATFTEMP COUNT

DSR REV (rpm)

DGEAR RATIO

DSTM STEP (step)

STM STEP (step)

LU PRS (MPa)

LINE PRS (MPa)

TGT SEC PRESS (MPa)

Revision: July 2007

CVT-51

K
Degree of opening for accelerator recognized by
the TCM
For fail-safe operation, the specific value used for
control is displayed

Means CVT fluid temperature. Actual oil temperature (C) cannot be checked unless a numeric
value is converted. Refer to CVT-12, "ATFTEMP
COUNT Conversion Table".

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Monitor item selection
SELECTION
FROM
MENU

ECU INPUT SIGNALS

MAIN SIGNALS

ISOLT1 (A)

Torque converter clutch solenoid valve output

current

ISOLT2 (A)

Pressure control solenoid valve A (line pressure

solenoid valve) output current

ISOLT3 (A)

Pressure control solenoid valve B (secondary

pressure solenoid valve) output current

SOLMON1 (A)

Torque converter clutch solenoid valve monitor

current

SOLMON2 (A)

Pressure control solenoid valve A (line pressure

solenoid valve) monitor current

SOLMON3 (A)

Pressure control solenoid valve B (secondary

pressure solenoid valve) monitor current

P POSITION SW (ON/OFF)

R POSITION SW (ON/OFF)

N POSITION SW (ON/OFF)

D POSITION SW (ON/OFF)

L POSITION SW (ON/OFF)

BRAKE SW (ON/OFF)

FULL SW (ON/OFF)

IDLE SW (ON/OFF)

SPORT MODE SW (ON/OFF)

STRDWNSW (ON/OFF)*

STRUPSW (ON/OFF)*

DOWNLVR (ON/OFF)

UPLVR (ON/OFF)

NON MMODE (ON/OFF)

MMODE (ON/OFF)

INDLRNG (ON/OFF)

L position indicator output

INDDRNG (ON/OFF)

D position indicator output

INDNRNG (ON/OFF)

N position indicator output

INDRRNG (ON/OFF)

R position indicator output

INDPRNG (ON/OFF)

P position indicator output

CVTLAMP (ON/OFF)

SPORT MODE IND (ON/OFF)

MMODE IND (ON/OFF)

Not mounted but displayed

SMCOIL D (ON/OFF)

Step motor coil D energizing status

SMCOIL C (ON/OFF)

Step motor coil C energizing status

SMCOIL B (ON/OFF)

Step motor coil B energizing status

Monitored item (Unit)

Remarks

Stop lamp switch (Signal input with CAN communication)

Signal input with CAN communication

Responds only to vehicles with Manual mode

Not mounted but displayed

Revision: July 2007

CVT-52

2008 Sentra

TROUBLE DIAGNOSIS
< SERVICE INFORMATION >
Monitor item selection
SELECTION
FROM
MENU

ECU INPUT SIGNALS

MAIN SIGNALS

SMCOIL A (ON/OFF)

LUSEL SOL OUT (ON/OFF)

LUSEL SOL MON (ON/OFF)

VDC ON (ON/OFF)

TCS ON (ON/OFF)

ABS ON (ON/OFF)

Models without ABS dose not indicate

ACC ON (ON/OFF)

Not mounted but displayed

RANGE

Indicates position is recognized by TCM. Indicates a specific value required for control when
fail-safe function is activated

M GEAR POS

Not mounted but displayed

Voltage (V)

Displays the value measured by the voltage

probe

Frequency (Hz)

DUTY-HI (high) (%)

DUTY-LOW (low) (%)

PLS WIDTH-HI (ms)

PLS WIDTH-LOW (ms)

Monitored item (Unit)

Remarks

B
Step motor coil A energizing status

CVT

Not mounted but displayed

H
The value measured by the pulse probe is displayed

*: With QR25DE

Diagnosis Procedure without CONSULT-III

INFOID:0000000001850970

OBD-II SELF-DIAGNOSTIC PROCEDURE (WITH GST)

Refer to EC-121, "Generic Scan Tool (GST) Function" .

Revision: July 2007

CVT-53

2008 Sentra

DTC U1000 CAN COMMUNICATION LINE

< SERVICE INFORMATION >

DTC U1000 CAN COMMUNICATION LINE

Description

INFOID:0000000001850971

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent malfunction detection ability.
Many electronic 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.

On Board Diagnosis Logic

INFOID:0000000001850972

This is an OBD-II self-diagnostic item.

Diagnostic trouble code U1000 CAN COMM CIRCUIT with CONSULT-III is detected when TCM cannot
communicate to other control units.

Possible Cause

INFOID:0000000001850973

Harness or connectors
(CAN communication line is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001850974

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and wait for at least 6 seconds.
If DTC is detected, go to CVT-56, "Diagnosis Procedure" .

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-54

2008 Sentra

DTC U1000 CAN COMMUNICATION LINE

< SERVICE INFORMATION >

Wiring Diagram - CVT - CAN

INFOID:0000000001850975

CVT

P
BCWA0736E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-55

2008 Sentra

DTC U1000 CAN COMMUNICATION LINE

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001850976

1.CHECK CAN COMMUNICATION CIRCUIT

With CONSULT-III

1. Turn ignition switch ON and start engine.

2. Select SELF-DIAG RESULTS mode for TRANSMISSION with CONSULT-III.
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Print out CONSULT-III screen, go to LAN section. Refer to LAN-25, "CAN System Specification
Chart" .
NO
>> INSPECTION END

Revision: July 2007

CVT-56

2008 Sentra

DTC U1010 TRANSMISSION CONTROL MODULE (CAN)

< SERVICE INFORMATION >

DTC U1010 TRANSMISSION CONTROL MODULE (CAN)

Description

A
INFOID:0000000001850977

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul- B
tiplex communication line with high data communication speed and excellent malfunction detection ability.
Many electronic 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 CVT
with less wiring. Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

INFOID:0000000001850978

This is an OBD-II self-diagnostic item.

Diagnostic trouble code U1010 CONTROL UNIT(CAN) with CONSULT-III is detected when TCM cannot
communicate to other control units.

Possible Cause

INFOID:0000000001850979

Harness or connectors
(CAN communication line is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001850980

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and wait for at least 6 seconds.
If DTC is detected, go to CVT-57, "Diagnosis Procedure".

WITH GST
K

Follow the procedure WITH CONSULT-III.

Diagnosis Procedure

INFOID:0000000001850981

1.CHECK DTC
With CONSULT-III

1. Turn ignition switch ON.

2. Select SELF-DIAG RESULTS mode for TRANSMISSION with CONSULT-III.
3. Touch ERASE.
4. Turn ignition switch OFF and wait for at least 10 seconds.
5. Perform DTC confirmation procedure. Refer to CVT-57, "DTC Confirmation Procedure".
Is any malfunction of the U1010 CONTROL UNIT(CAN) indicated?
YES >> Replace the TCM. Refer to CVT-165, "Removal and Installation".
NO
>> INSPECTION END

Revision: July 2007

CVT-57

2008 Sentra

DTC P0703 STOP LAMP SWITCH CIRCUIT

< SERVICE INFORMATION >

DTC P0703 STOP LAMP SWITCH CIRCUIT

Description

INFOID:0000000001850982

ON, OFF status of the stop lamp switch is sent via the CAN communication from the combination meter to
TCM using the signal.

CONSULT-III Reference Value

Item name
BRAKE SW

INFOID:0000000001850983

Condition

Display value

Depressed brake pedal

ON

Released brake pedal

OFF

On Board Diagnosis Logic

INFOID:0000000001850984

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P0703 BRAKE SW/CIRC with CONSULT-III is detected when the stop lamp switch
does not switch to ON and OFF.
- The stop lamp switch does not switch to ON and OFF.

Possible Cause

INFOID:0000000001850985

Harness or connectors
(Stop lamp switch, and combination meter circuit are open or shorted.)
(CAN communication line is open or shorted.)
Stop lamp switch

DTC Confirmation Procedure

INFOID:0000000001850986

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.
5.

Turn ignition switch ON. (Do not start engine.)

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine.
Start vehicle for at least 3 consecutive seconds.
If DTC is detected, go to CVT-58, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001850987

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Check CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK STOP LAMP SWITCH CIRCUIT

1.
2.
3.

With CONSULT-III
Turn ignition switch ON.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out ON/OFF switching action of the BRAKE SW.

Revision: July 2007

CVT-58

2008 Sentra

DTC P0703 STOP LAMP SWITCH CIRCUIT

< SERVICE INFORMATION >
Item name
BRAKE SW

Condition

Display value

Depressed brake pedal

ON

Released brake pedal

OFF

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.

CVT

3.CHECK STOP LAMP SWITCH

Check continuity between stop lamp switch harness connector E60 terminals 1 and 2. Refer to CVT-150, "Wiring Diagram - CVT - NONDTC".
Condition

Continuity

When brake pedal is depressed

Yes

When brake pedal is released

No

Check stop lamp switch after adjusting brake pedal refer to BR-5.
OK or NG
OK
>> Check the following. If NG, repair or replace damaged parts.
Harness for short or open between battery and stop lamp switch.
Harness for short or open between stop lamp switch and combination meter.
NG
>> Repair or replace the stop lamp switch.

Revision: July 2007

CVT-59

2008 Sentra

DTC P0705 PARK/NEUTRAL POSITION SWITCH

< SERVICE INFORMATION >

DTC P0705 PARK/NEUTRAL POSITION SWITCH

Description

INFOID:0000000001850988

The PNP switch assembly includes a transaxle range switch.

The transaxle range switch detects the selector lever position and sends a signal to the TCM.

CONSULT-III Reference Value

Item name
P POSITION SW

R POSITION SW

N POSITION SW

D POSITION SW

L POSITION SW

RANGE

INFOID:0000000001850989

Condition

Display value

Selector lever in P position

ON

When setting selector lever to other positions.

OFF

Selector lever in R position

ON

When setting selector lever to other positions.

OFF

Selector lever in N position

ON

When setting selector lever to other positions.

OFF

Selector lever in D position

ON

When setting selector lever to other positions.

OFF

Selector lever in L position

ON

When setting selector lever to other positions.

OFF

Selector lever in N or P position

NP

Selector lever in R position

Selector lever in D position

Selector lever in L position

On Board Diagnosis Logic

INFOID:0000000001850990

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0705 PNP SW/CIRC with CONSULT-III is detected when TCM dose not receive
the correct voltage signal from the switch based on the gear position.

Possible Cause

INFOID:0000000001850991

Harness or connectors
(The PNP switch circuit is open or shorted.)
PNP switch

DTC Confirmation Procedure

INFOID:0000000001850992

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

5.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine.
Drive vehicle and maintain the following conditions for at least 2 consecutive seconds.
VEHICLE SPEED: More than 10 km/h (6 MPH)
ENG SPEED: More than 450 rpm
ACC PEDAL OPEN: More than 1.0/8
If DTC is detected, go to CVT-62, "Diagnosis Procedure".

Revision: July 2007

CVT-60

2008 Sentra

DTC P0705 PARK/NEUTRAL POSITION SWITCH

< SERVICE INFORMATION >

WITH GST
A

Follow the procedure WITH CONSULT-III.

Wiring Diagram - CVT - PNP/SW

INFOID:0000000001850993

CVT

BCWA0737E

TCM TERMINALS AND REFERENCE VALUES

Revision: July 2007

CVT-61

2008 Sentra

DTC P0705 PARK/NEUTRAL POSITION SWITCH

< SERVICE INFORMATION >
Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Diagnosis Procedure

INFOID:0000000001850994

1. CHECK PNP SW SIGNALS

1.
2.
3.

With CONSULT-III
Turn ignition switch ON.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out P, R, N, D and L position switches moving selector lever to each position.

Item name
P POSITION SW

R POSITION SW

N POSITION SW

D POSITION SW

L POSITION SW

1.
2.

Condition

Display value

When setting selector lever to P position.

ON

When setting selector lever to other positions.

OFF

When setting selector lever to R position.

ON

When setting selector lever to other positions.

OFF

When setting selector lever to N positions.

ON

When setting selector lever to other positions.

OFF

When setting selector lever to D position.

ON

When setting selector lever to other positions.

OFF

When setting selector lever to L position.

ON

When setting selector lever to other positions.

OFF

Without CONSULT-III
Turn ignition switch ON.
Check voltage between TCM connector terminals and ground while moving selector lever through each
position.

Selector lever position

Terminal
11

B: Battery voltage
0: 0V

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK PNP SWITCH

1.
2.

Turn ignition switch OFF.

Disconnect PNP switch harness connector.

Revision: July 2007

CVT-62

2008 Sentra

DTC P0705 PARK/NEUTRAL POSITION SWITCH

< SERVICE INFORMATION >
3. Check continuity between PNP switch harness connector terminals.
Selector lever position

Connector

Terminal

Continuity

2 - 5, 6 - 7

5-8

Yes
*Continuity
should not
exist in positions other
than the
specified
positions.

F26

3 - 5, 6 - 7

4-5

1-5

CVT
SCIA8165E

OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.

3.CHECK CONTROL CABLE ADJUSTMENT

Check PNP switch again with control cable disconnected from manual shaft of A/T assembly. Refer to test
group 2.
OK or NG
OK
>> Adjust control cable. Refer to CVT-173, "Adjustment of CVT Position".
NG
>> Check PNP switch (Refer to test group 1) again after adjusting PNP switch (Refer to CVT-178).
If OK, INSPECTION END
If NG, repair or replace PNP switch. Refer to CVT-178, "Park/Neutral Position (PNP) Switch".

4. DETECT MALFUNCTIONING ITEM

Check the following items.

Harness for short or open between ignition switch and PNP switch.
Harness for short or open between PNP switch and TCM.
10A fuse [No.14, located in the fuse block (J/B)].
Ignition switch. Refer to PG-3.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.CHECK DTC

Perform CVT-60, "DTC Confirmation Procedure".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> 1. Repair or replace damaged parts.
2. Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Component Inspection

INFOID:0000000001850995

PNP SWITCH

Revision: July 2007

CVT-63

2008 Sentra

DTC P0705 PARK/NEUTRAL POSITION SWITCH

< SERVICE INFORMATION >
1. Check continuity between PNP switch harness connector terminals.
Selector lever position

Terminal

Continuity

2 - 5, 6 - 7

5-8

Yes
*Continuity
should not
exist in positions other
than the
specified
positions.

2.

3.
4.
5.
6.

Connector

F26

3 - 5, 6 - 7

4-5

1-5

If NG, check again with control cable (2) disconnected from

manual shaft of CVT assembly. Refer to step 1.
(1): Manual shaft
(A): Lock nut
If OK on step 2, adjust control cable (2). Refer to CVT-173,
"Adjustment of CVT Position".
If NG on step 2, remove PNP switch from CVT and check continuity of PNP switch terminals. Refer to step 1.
If OK on step 4, adjust PNP switch. Refer to CVT-174, "Adjustment of PNP switch".
If NG on step 4, replace PNP switch. Refer to CVT-178, "Park/
Neutral Position (PNP) Switch".

Revision: July 2007

CVT-64

SCIA8165E

SCIA6625J

2008 Sentra

DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT

< SERVICE INFORMATION >

DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT

Description

A
INFOID:0000000001850996

The CVT fluid temperature sensor is included in the control valve assembly.
The CVT fluid temperature sensor detects the CVT fluid temperature and sends a signal to the TCM.

CONSULT-III Reference Value

INFOID:0000000001850997

CVT
Remarks: Specification data are reference values.

Item name
ATF TEMP SEN

Condition

Display value (Approx.)

When CVT fluid temperature is 20C (68F)

2.0 V

When CVT fluid temperature is 80C (176F)

1.0 V

On Board Diagnosis Logic

INFOID:0000000001850998

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0710 ATF TEMP SEN/CIRC with CONSULT-III is detected when TCM receives
an excessively low or high voltage from the sensor.

Possible Cause

DTC Confirmation Procedure

INFOID:0000000001851000

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III

4.

INFOID:0000000001850999

Harness or connectors
(Sensor circuit is open or shorted.)
CVT fluid temperature sensor

1.
2.
3.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 10 minutes (Total).
VEHICLE SPEED: 10 km/h (6 MPH) or more
ENG SPEED: 450 rpm more than
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
If DTC is detected, go to CVT-67, "Diagnosis Procedure".

WITH GST

Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-65

2008 Sentra

DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT

< SERVICE INFORMATION >

Wiring Diagram - CVT - FTS

INFOID:0000000001851001

BCWA0738E

TCM TERMINALS AND REFERENCE VALUES

Refer toCVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-66

2008 Sentra

DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851002

1. CHECK CVT FLUID TEMPERATURE SENSOR SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out the value of ATF TEMP SEN.

CVT
Item name

ATF TEMP SEN

1.
2.

Condition

Display value
(Approx.)

When CVT fluid temperature is 20C

(68F)

2.0 V

When CVT fluid temperature is 80C

(176F)

1.0 V

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminals.
Name

Connector

Terminal

CVT fluid temperature sensor

F23

13 - 25

Temperature
C (F)

Voltage
(Approx.)

20 (68)

2.0 V

80 (176)

1.0 V

3. Turn ignition switch OFF.

4. Disconnect TCM connector.
5. Check if there is continuity between connector terminal and ground.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2. CHECK CVT FLUID TEMPERATURE SENSOR CIRCUIT

1.
2.
3.

Turn ignition switch OFF.

Disconnect the TCM connector.
Check resistance between TCM connector terminals.

L
Name

Connector

Terminal

CVT fluid temperature sensor

F23

13 - 25

Temperature
C (F)

Resistance
(Approx.)

20 (68)

6.5 k

80 (176)

0.9 k

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.

3. CHECK CVT FLUID TEMPERATURE SENSOR

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.
P

Revision: July 2007

CVT-67

2008 Sentra

DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminals.
Name

Connector

Terminal

CVT fluid
temperature
sensor

F46

17 - 19

Temperature C (F)

Resistance
(Approx.)

20 (68)

6.5 k

80 (176)

0.9 k

4. Reinstall any part removed.

OK or NG
SCIA4679E
OK
>> GO TO 4.
NG
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

4. CHECK HARNESS BETWEEN TCM AND CVT FLUID TEMPERATURE SENSOR

1.
2.
3.

Turn ignition switch OFF.

Disconnect the TCM connector (A) and CVT unit harness connector (B).
Check continuity between TCM connector (A) terminals and
CVT unit harness connector (B) terminals.
Item

Connector

Terminal

TCM

F23

13

CVT unit harness connector

F46

17

TCM

F23

25

CVT unit harness connector

F46

19

Continuity
Yes

Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

SCIA8169E

5.CHECK DTC
Perform CVT-65, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000001851003

CVT FLUID TEMPERATURE SENSOR

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-68

2008 Sentra

DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminals.
Name

Connector

Terminal

CVT fluid
temperature
sensor

F46

17 - 19

4.

Temperature C (F)

Resistance
(Approx.)

20 (68)

6.5 k

80 (176)

0.9 k

If NG, replace the transaxle assembly. Refer to CVT-187,

"Removal and Installation (MR20DE)".

CVT
SCIA4679E

Revision: July 2007

CVT-69

2008 Sentra

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)

< SERVICE INFORMATION >

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)

Description

INFOID:0000000001851004

The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a signal to the TCM.

CONSULT-III Reference Value

INFOID:0000000001851005

Remarks: Specification data are reference values.

Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

PRI SPEED SEN

During driving (lock-up ON)

Approximately matches the engine speed.

On Board Diagnosis Logic

INFOID:0000000001851006

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0715 INPUT SPD SEN/CIRC with CONSULT-III is detected when TCM does not
receive the proper signal from the sensor.

Possible Cause

INFOID:0000000001851007

Harness or connectors
(Sensor circuit is open or shorted.)
Input speed sensor (Primary speed sensor)

DTC Confirmation Procedure

INFOID:0000000001851008

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 5 consecutive seconds.
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
ENG SPEED: 450 rpm or more
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If DTC is detected, go to CVT-72, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-70

2008 Sentra

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)

< SERVICE INFORMATION >

Wiring Diagram - CVT - PRSCVT

INFOID:0000000001851009

CVT

P
BCWA0739E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-71

2008 Sentra

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851010

1.CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of VSP SENSOR.

Item name

Condition

Display value

PRI SPEED SEN

During driving (lock-up

ON)

Approximately matches
the speedometer reading.

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 2.

2.CHECK PRIMARY SPEED SENSOR

1.
2.

3.

With CONSULT-III
Start engine.
Check power supply to input speed sensor (primary speed sensor) by voltage between TCM connector
terminals 25, 46 and 48. Refer to CVT-34, "Circuit Diagram".
Item

Connector

TCM

F23

Terminal

Data (Approx.)

25 - 46

Battery voltage

25 - 48

If OK, check the pulse when vehicle cruises.

Name

Condition

Input speed sensor

(Primary speed
sensor)

When running at 20 km/h (12 MPH) in L position, use the

CONSULT-III pulse frequency measuring function.
CAUTION:
Connect the data link connector to the vehicle-side diagnosis connector.

Item

Connector

Terminal

Name

Data (Approx.)

TCM

F23

33

Input speed sensor (Primary

speed sensor)

890 Hz

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 3.

3. CHECK POWER AND SENSOR GROUND

1.
2.
3.

Turn ignition switch OFF.

Disconnect the input speed sensor (primary speed sensor) harness connector.
Turn ignition switch ON.

Revision: July 2007

CVT-72

2008 Sentra

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)

< SERVICE INFORMATION >
4. Check voltage between input speed sensor (primary speed sensor) harness connector terminals.
Item

Connector

Terminal

Data (Approx.)

Input speed sensor (Primary speed sensor)

F38

3-1

Battery voltage

CVT
SCIA8259E

5.

Check voltage between input speed sensor (primary speed sensor) harness connector terminal and ground.
E
Item

Connector

Terminal

Data (Approx.)

Input speed sensor (Primary speed sensor)

F38

3 - ground

Battery voltage

6. If OK, check harness for short to ground and short to power.

7. Reinstall any part removed.
OK or NG
OK
>> GO TO 4.
NG - 1 >> Battery voltage is not supplied between terminals 1 and
3, terminals 1 and ground: GO TO 6.
NG - 2 >> Battery voltage is not supplied between terminals 1 and 3 only: GO TO 7.

G
SCIA8260E

4. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)
1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector (A) and input speed sensor (primary speed sensor) harness connector (B).
Check continuity between TCM connector (A) terminal and input
speed sensor (primary speed sensor) harness connector (B) terminal.
Item

Connector

Terminal

TCM

F23

33

Input speed sensor (Primary speed sensor)

F38

Continuity

Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

SCIA8173E

5. CHECK THE TCM SHORT

Replace same type TCM, perform self-diagnosis check. Erase self-diagnostic results and them drive the vehicle [more than 40 km/h (25 MPH)], perform self-diagnosis check. Refer to CVT-75, "DTC Confirmation Procedure".
Is P0715 PRI SPEED SEN detected again?
YES >> Replace the Primary speed sensor. Refer to CVT-179, "Primary Speed Sensor".
NO
>> Replace TCM. Refer to CVT-165, "Removal and Installation".

6. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) (POWER)
1. Turn ignition switch OFF.
2. Disconnect TCM connector, IPDM E/R connector, input speed sensor (primary speed sensor) and output
speed sensor (secondary speed sensor) harness connector.
Revision: July 2007

CVT-73

2008 Sentra

DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)

< SERVICE INFORMATION >
3. Check continuity between TCM connector terminals, IPDM E/R harness connector terminal, input speed
sensor (primary speed sensor) harness connector terminal and output speed sensor (secondary speed
sensor) harness connector terminal. Refer to CVT-34, "Circuit Diagram".
Item

Connector

Terminal

TCM*

F23

46, 48

IPDM E/R*

E43

14

Input speed sensor (Primary speed sensor)*

F38

Output speed sensor (Secondary speed sensor)*

F30

Continuity

Yes

*: Vehicle side

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> 10 A fuse (No. 49, located in the IPDM E/R) or ignition switch are malfunctioning.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

7. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) (SENSOR GROUND)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and input speed sensor (primary speed sensor) harness connector (B).
3. Check continuity between TCM (A) connector terminal and input
speed sensor (primary speed sensor) harness connector (B) terminal.
Item

Connector

Terminal

TCM

F23

25

input speed sensor (Primary speed sensor)

F38

Continuity
Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

SCIA8175E

8.CHECK DTC
Perform CVT-75, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 9.

9.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-74

2008 Sentra

DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)

< SERVICE INFORMATION >

DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)

Description

INFOID:0000000001851011

The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of the
CVT output shaft and emits a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle
speed.
CVT

CONSULT-III Reference Value

INFOID:0000000001851012

Remarks: Specification data are reference values.

Item name

Condition

Display value

VSP SENSOR

During driving

Approximately matches the speedometer reading.

On Board Diagnosis Logic

INFOID:0000000001851013

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0720 VEH SPD SEN/CIR AT with CONSULT-III is detected TCM does not
receive the proper signal from the sensor.

Possible Cause

INFOID:0000000001851014

Harness or connectors
(Sensor circuit is open or shorted.)
Output speed sensor (Secondary speed sensor)

DTC Confirmation Procedure

H
INFOID:0000000001851015

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 12 consecutive seconds.
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If DTC is detected, go to CVT-77, "Diagnosis Procedure".

WITH GST

Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-75

2008 Sentra

DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)

< SERVICE INFORMATION >

Wiring Diagram - CVT - SESCVT

INFOID:0000000001851016

BCWA0740E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-76

2008 Sentra

DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851017

1.CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of VSP SENSOR.

CVT
Item name

Condition

Display value

VSP SENSOR

During driving

Approximately matches
the speedometer reading.

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 2.

2. CHECK SECONDARY SPEED SENSOR

With CONSULT-III
1. Start engine.
2. Check power supply to output speed sensor (secondary speed sensor) by voltage between TCM connector terminals 7, 46 and 48. Refer to CVT-34, "Circuit Diagram".

3.

Item

Connector

TCM

F23

Terminal

H
Battery voltage

7 - 48

If OK, check the pulse when vehicle cruises.

Name

Condition

Output speed sensor (Secondary

speed sensor)

When running at 20 km/h (12 MPH) in D position, use the

CONSULT-III pulse frequency measuring function.
CAUTION:
Connect the data link connector to the vehicle-side diagnosis connector.

Connector

Terminal

TCM

F23

34

Data (Approx.)

Name
Output speed sensor (Secondary speed sensor)

460 Hz

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 3.

3. CHECK POWER AND SENSOR GROUND

1.
2.
3.

Data (Approx.)

7- 46

Item

Turn ignition switch OFF.

Disconnect the output speed sensor (secondary speed sensor) harness connector.
Turn ignition switch ON.

Revision: July 2007

CVT-77

2008 Sentra

DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)

< SERVICE INFORMATION >
4. Check voltage between output speed sensor (secondary speed
sensor) harness connector terminals.
Item

Connector

Terminal

Data (Approx.)

Output speed sensor (Secondary speed sensor)

F30

3-1

Battery voltage

SCIA8259E

5.

Check voltage between output speed sensor (secondary speed

sensor) harness connector terminal and ground.
Item

Connector

Terminal

Data (Approx.)

Output speed sensor (Secondary speed sensor)

F30

3 - ground

Battery voltage

6. If OK, check harness for short to ground and short to power.

7. Reinstall any part removed.
OK or NG
SCIA8260E
OK
>> GO TO 4.
NG - 1 >> Battery voltage is not supplied between terminals 1 and 3, terminals 1 and ground: GO TO 6.
NG - 2 >> Battery voltage is not supplied between terminals 1 and 3 only: GO TO 7.

4. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)
1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector (A) and output speed sensor (secondary speed sensor) harness connector
(B).
Check continuity between TCM connector (A) terminal and output speed sensor (secondary speed sensor) harness connector
(B) terminal.
Connector

Terminal

TCM

Item

F23

34

Output speed sensor (Secondary speed sensor)

F30

Continuity
Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

SCIA8177E

5. CHECK THE TCM SHORT

Replace same type TCM, perform self-diagnosis check. Erase self-diagnostic results and them drive the vehicle [more than 40 km/h (25 MPH)], perform self-diagnosis check. Refer to CVT-75, "DTC Confirmation Procedure".
Is P0720 VEH SPD SEN/CIR CVT detected again?
YES >> Replace the Secondary speed sensor. Refer to CVT-180, "Secondary Speed Sensor".
NO
>> Replace TCM. Refer to CVT-165, "Removal and Installation".

6. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)
(POWER)
1. Turn ignition switch OFF.
2. Disconnect TCM connector, IPDM E/R connector, input speed sensor (primary speed sensor) and output
speed sensor (secondary speed sensor) harness connector.
Revision: July 2007

CVT-78

2008 Sentra

DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)

< SERVICE INFORMATION >
3. Check continuity between TCM connector terminals, IPDM E/R harness connector terminal, input speed
sensor (primary speed sensor) harness connector terminal and output speed sensor (secondary speed
sensor) harness connector terminal. Refer to CVT-34, "Circuit Diagram".
Item

Connector

Terminal

TCM*

F23

46, 48

IPDM E/R*

E43

14

Input speed sensor (Primary speed sensor)*

F38

Output speed sensor (Secondary speed sensor)*

F30

Continuity

CVT
Yes

*: Vehicle side

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> 10 A fuse (No. 49, located in the IPDM E/R) or ignition switch are malfunctioning.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

7. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)
(SENSOR GROUND)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and output speed sensor (secondary speed sensor) harness connector
(B).
3. Check continuity between TCM connector (A) terminal and output speed sensor (secondary speed sensor) harness connector
(B) terminal.

I
Item

Connector

Terminal

TCM

F23

Output speed sensor (Secondary speed sensor)

F30

Continuity

Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

K
SCIA8255E

8.CHECK DTC
M

Perform CVT-75, "DTC Confirmation Procedure".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 9.

9.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-79

2008 Sentra

DTC P0725 ENGINE SPEED SIGNAL

< SERVICE INFORMATION >

DTC P0725 ENGINE SPEED SIGNAL

Description

INFOID:0000000001851018

The engine speed signal is sent from the ECM to the TCM.

CONSULT-III Reference Value

INFOID:0000000001851019

Remarks: Specification data are reference values.

Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

ACC PEDAL OPEN

Released accelerator pedal - Fully depressed accelerator pedal

0.0/8 - 8.0/8

On Board Diagnosis Logic

INFOID:0000000001851020

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P0725 ENGINE SPEED SIG with CONSULT-III is detected when TCM does not
receive the engine speed signal (input by CAN communication) from ECM.

Possible Cause

INFOID:0000000001851021

Harness or connectors
(The ECM to the TCM circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851022

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 10 consecutive seconds.
PRI SPEED SEN: More than 1000 rpm
If DTC is detected, go to CVT-80, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001851023

1. CHECK DTC WITH ECM

With CONSULT-III
Turn ignition switch ON.
Select SELF-DIAG RESULTS mode for ENGINE with CONSULT-III. Refer to EC-113, "CONSULT-III
Function (ENGINE)".
OK or NG
OK
>> GO TO 2.
NG
>> Check the DTC detected item. Refer to EC-113, "CONSULT-III Function (ENGINE)".

1.
2.

2. CHECK DTC WITH TCM

With CONSULT-III
Turn ignition switch ON.
Select SELF-DIAG RESULTS mode for TRANSMISSION with CONSULT-III. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
OK or NG
OK
>> GO TO 3.
NG
>> Check the DTC detected item. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".

1.
2.

Revision: July 2007

CVT-80

2008 Sentra

DTC P0725 ENGINE SPEED SIGNAL

< SERVICE INFORMATION >
If DTC of CAN communication line is detected, go to CVT-54.

3. CHECK INPUT SIGNALS

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
While monitoring ENG SPEED SIG, check for engine speed change corresponding to ACC PEDAL
OPEN.

CVT
Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

ACC PEDAL OPEN

Released accelerator
pedal - Fully depressed
accelerator pedal

0.0/8 - 8.0/8

OK or NG
OK
>> GO TO 4.
NG
>> Check ignition signal circuit. Refer to EC-505.

4. CHECK DTC
Perform CVT-80, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 5.

5. CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-81

2008 Sentra

DTC P0730 BELT DAMAGE

< SERVICE INFORMATION >

DTC P0730 BELT DAMAGE

Description

INFOID:0000000001851024

TCM selects the gear ratio using the engine load (throttle position), the primary pulley revolution speed, and
the secondary pulley revolution speed as input signal. Then it changes the operating pressure of the primary
pulley and the secondary pulley and changes the groove width of the pulley.

CONSULT-III Reference Value

INFOID:0000000001851025

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

GEAR RATIO

During driving

2.34 - 0.39

On Board Diagnosis Logic

INFOID:0000000001851026

This is not an OBD-II self-diagnostic item.

TCM calculates the actual gear ratio with input speed sensor (primary speed sensor) and output speed sensor (secondary speed sensor).
Diagnostic trouble code P0730 BELT DAMG with CONSULT-III is detected, when TCM receives an unexpected gear ratio signal.

Possible Cause

INFOID:0000000001851027

Transaxle assembly

DTC Confirmation Procedure

INFOID:0000000001851028

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.
4.

5.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (cool down the fluid)
Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 30 consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
ENG SPEED: 450 rpm or more
If DTC is detected, go to CVT-82, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001851029

1.CHECK DTC
Perform CVT-82, "DTC Confirmation Procedure".
Are any DTC displayed?
YES - 1>> DTC except for P0730 BELT DAMG is displayed: Go to Check the DTC detected item. Refer to
CVT-46, "CONSULT-III Function (TRANSMISSION)".
YES - 2>> DTC for P0730 BELT DAMG is displayed: Replace the transaxle assembly. Refer to CVT-187,
"Removal and Installation (MR20DE)".
NO
>> INSPECTION END
Revision: July 2007

CVT-82

2008 Sentra

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

< SERVICE INFORMATION >

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

Description

A
INFOID:0000000001851030

The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehi- B
cle speed and accelerator pedal position sensors. Lock-up piston operation will then be controlled.
Lock-up operation, however, is prohibited when CVT fluid temperature is too low.
When the accelerator pedal is depressed (less than 2.0/8) in lock-up condition, the engine speed should not
CVT
change abruptly. If there is a big jump in engine speed, there is no lock-up.

CONSULT-III Reference Value

INFOID:0000000001851031

Remarks: Specification data are reference values.

Item name
ISOLT1

Condition

Display value (Approx.)

Lock-up OFF

0.0 A

Lock-up ON

0.7 A

On Board Diagnosis Logic

INFOID:0000000001851032

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0740 TCC SOLENOID/CIRC with CONSULT-III is detected under the following
conditions.
- TCM detects an improper voltage drop when it tries to operate the solenoid valve.

Possible Cause

INFOID:0000000001851033

Torque converter clutch solenoid valve

Harness or connectors
(Solenoid circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851034

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III and wait at least 10 consecutive
seconds.
If DTC is detected, go to CVT-85, "Diagnosis Procedure".

WITH GST

Follow the procedure WITH CONSULT-III.

N

Revision: July 2007

CVT-83

2008 Sentra

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

< SERVICE INFORMATION >

Wiring Diagram - CVT - TCV

INFOID:0000000001851035

BCWA0741E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-84

2008 Sentra

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851036

1.CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of ISOLT1.

CVT
Item name
ISOLT1

1.
2.

Condition

Display value (Approx.)

Lock-up OFF

0.0 A

Lock-up ON

0.7 A

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminal and ground.
Name

Torque converter
clutch solenoid valve

Connector

Terminal

F23

38 ground

Voltage
(Approx.)

Condition
When vehicle cruises
in D position

Lock-up ON

6.0 V

Lock-up OFF

1.5 V

3. Turn ignition switch OFF.

4. Disconnect TCM connector.
5. Check if there is continuity between the connector terminal and ground.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT

1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector.
Check resistance between TCM connector terminal and ground.
Solenoid valve

Connector

Terminal

Resistance
(Approx.)

Torque converter clutch solenoid valve

F23

38 - Ground

3-9

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.

3. CHECK HARNESS BETWEEN TCM AND TORQUE CONVERTER CLUTCH SOLENOID VALVE
1.
2.

Turn ignition switch OFF.

Disconnect TCM connector (A) and CVT unit harness connector (B).

Revision: July 2007

CVT-85

2008 Sentra

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

< SERVICE INFORMATION >
3. Check continuity between TCM connector terminal (A) and CVT
unit harness connector terminal (B).
Item

Connector

Terminal

TCM

F23

38

CVT unit harness connector

F46

12

Continuity
Yes

4. If OK, check harness for short to ground and short to power.

5. If OK, check continuity between ground and CVT assembly.
6. Reinstall any part removed.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

SCIA8182E

4.CHECK VALVE RESISTANCE

1.
2.
3.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.
Check resistance between CVT unit harness connector terminal
and ground.
Solenoid Valve

Connector

Terminal

Resistance (Approx.)

Torque converter clutch solenoid valve

F46

12 - Ground

3-9

OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

SCIA4684E

5.CHECK DTC
Perform CVT-83, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000001851037

TORQUE CONVERTER CLUTCH SOLENOID VALVE

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-86

2008 Sentra

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.
Solenoid Valve

Connector

Terminal

Resistance (Approx.)

Torque converter clutch solenoid valve

F46

12 - Ground

3-9

4.

CVT

If NG, replace the transaxle assembly. Refer to CVT-187,

"Removal and Installation (MR20DE)".
SCIA4684E

Revision: July 2007

CVT-87

2008 Sentra

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

< SERVICE INFORMATION >

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

Description

INFOID:0000000001851038

This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM.
This is not only caused by electrical malfunction (circuits open or shorted), but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.

CONSULT-III Reference Value

INFOID:0000000001851039

Remarks: Specification data are reference values.

Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

PRI SPEED SEN

During driving (lock-up ON)

Approximately matches the engine speed.

On Board Diagnosis Logic

INFOID:0000000001851040

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0744 A/T TCC S/V FNCTN with CONSULT-III is detected under the following
conditions.
- When CVT cannot perform lock-up even if electrical circuit is good.
- When TCM compares difference value with slip revolution and detects an irregularity.

Possible Cause

INFOID:0000000001851041

Torque converter clutch solenoid valve

Hydraulic control circuit

DTC Confirmation Procedure

INFOID:0000000001851042

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.

4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following condition for at least 30 seconds.
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
[Vehicle speed: Constant speed of more than 40 km/h (25 MPH)]
If DTC is detected go to CVT-88, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Diagnosis Procedure

INFOID:0000000001851043

1.CHECK INPUT SIGNALS

1.
2.
3.
4.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle.
Check if there is a great difference between ENG SPEED SIG and PRI SPEED SEN. (Lock-up ON.)

Revision: July 2007

CVT-88

2008 Sentra

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

< SERVICE INFORMATION >
Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

PRI SPEED SEN

During driving (lock-up ON)

Approximately matches
the engine speed.

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

CVT

2.CHECK LINE PRESSURE

Perform line pressure test. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts. Refer to CVT-35, "Inspections before Trouble Diagnosis".

3.DETECT MALFUNCTIONING ITEM

Check the following:

Torque converter clutch solenoid valve. Refer to CVT-86, "Component Inspection".
Lock-up select solenoid valve. Refer to CVT-135, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED
SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to CVT-75, CVT-70.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.CHECK DTC
K

Perform CVT-88, "DTC Confirmation Procedure".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> 1. Repair or replace damaged parts.
2. Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Revision: July 2007

CVT-89

2008 Sentra

DTC P0745 LINE PRESSURE SOLENOID VALVE

< SERVICE INFORMATION >

DTC P0745 LINE PRESSURE SOLENOID VALVE

Description

INFOID:0000000001851044

The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.

CONSULT-III Reference Value

INFOID:0000000001851045

Remarks: Specification data are reference values.

Item name
ISOLT2

Condition

Display value (Approx.)

Release your foot from the accelerator pedal

0.8 A

Press the accelerator pedal all the way down

0.0 A

On Board Diagnosis Logic

INFOID:0000000001851046

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0745 L/PRESS SOL/CIRC with CONSULT-III is detected under the following
conditions.
- TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

INFOID:0000000001851047

Harness or connectors
(Solenoid circuit is open or shorted.)
Pressure control solenoid valve A (Line pressure solenoid valve)

DTC Confirmation Procedure

INFOID:0000000001851048

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and wait at least 5 seconds.
If DTC is detected, go to CVT-92, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-90

2008 Sentra

DTC P0745 LINE PRESSURE SOLENOID VALVE

< SERVICE INFORMATION >

Wiring Diagram - CVT - LPSV

INFOID:0000000001851049

CVT

P
BCWA0742E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-91

2008 Sentra

DTC P0745 LINE PRESSURE SOLENOID VALVE

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851050

1. CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out the value of ISOLT2.

Item name

ISOLT2

1.
2.

Condition

Display value (Approx.)

Release your foot from the

accelerator pedal.

0.8 A

Press the accelerator pedal all the way down.

0.0 A

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminal and ground.
Name

Connector

Pressure
control solenoid
valve A
(Line pressure solenoid valve)

F23

Condition

Voltage
(Approx.)

Release your foot from

the accelerator pedal.

5.0 - 7.0 V

Press the accelerator

pedal all the way down.

1.0 V

Terminal

40 - ground

3. Turn ignition switch OFF.

4. Disconnect TCM connector.
5. Check if there is continuity between connector terminal and ground.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE) CIRCUIT
1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector.
Check resistance between TCM connector terminal and ground.
Solenoid valve

Connector

Terminal

Resistance (Approx.)

F23

40 - ground

3.0 - 9.0

Pressure control solenoid valve A

(Line pressure solenoid valve)

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
SCIA8184E

3.CHECK VALVE RESISTANCE

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-92

2008 Sentra

DTC P0745 LINE PRESSURE SOLENOID VALVE

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.

Solenoid valve

Connector

Terminal

Resistance (Approx.)

F46

2 - Ground

3.0 - 9.0

Pressure control solenoid valve A

(Line pressure solenoid valve)

OK or NG
OK
>> GO TO 4.
NG
>> Replace the transaxle assembly. Refer to CVT-187,
"Removal and Installation (MR20DE)".

CVT
SCIA4686E

4. CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)
1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector (B) and TCM connector (A).
3. Check continuity between TCM connector (A) terminal and CVT
unit harness connector (B) terminal.
Item

Connector

Terminal

TCM

F23

40

CVT unit harness connector

F46

Continuity

G
Yes

4. If OK, check harness for short to ground and short to power.

5. If OK, check continuity between ground and CVT assembly.
6. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

SCIA8185E

5.CHECK DTC

Perform CVT-90, "DTC Confirmation Procedure".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> 1. Repair or replace damaged parts.
2. Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Component Inspection

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

INFOID:0000000001851051

PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

1.
2.

CVT-93

2008 Sentra

DTC P0745 LINE PRESSURE SOLENOID VALVE

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.
Solenoid valve
Pressure control solenoid valve A
(Line pressure solenoid valve)

4.

Connector

Terminal

Resistance (Approx.)

F46

2 - Ground

3.0 - 9.0

If NG, replace the transaxle assembly. Refer to CVT-187,

"Removal and Installation (MR20DE)".
SCIA4686E

Revision: July 2007

CVT-94

2008 Sentra

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE

PRESSURE SOLENOID VALVE)
Description

INFOID:0000000001851052

The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
CVT

CONSULT-III Reference Value

INFOID:0000000001851053

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

PRI PRESS

N position idle

0.3 - 0.7 MPa

On Board Diagnosis Logic

INFOID:0000000001851054

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0746 PRS CNT SOL/A FCTN with CONSULT-III is detected under the following
conditions.
- Unexpected gear ratio was detected in the LOW side due to excessively low line pressure.

Possible Cause

INFOID:0000000001851055

Line pressure control system

Output speed sensor (Secondary speed sensor)
Input speed sensor (Primary speed sensor)

DTC Confirmation Procedure

H
INFOID:0000000001851056

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 10 consecutive seconds. Test start from 0
km/h (0 MPH).
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If DTC is detected, go to CVT-95, "Diagnosis Procedure".

WITH GST
O

Follow the procedure WITH CONSULT-III.

Diagnosis Procedure

INFOID:0000000001851057

1.CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of PRI PRESS.

Revision: July 2007

CVT-95

2008 Sentra

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >
Item name

Condition

Display value (Approx.)

PRI PRESS

N position idle

0.3 - 0.7 MPa

1.
2.

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminal and ground.
Name

Connector

Terminal

Condition

Voltage
(Approx.)

Transmission
fluid pressure
sensor B (Primary pressure
sensor)

F23

14 - Ground

N position idle

0.7 - 3.5 V

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK LINE PRESSURE

Perform line pressure test. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts. Refer to CVT-35, "Inspections before Trouble Diagnosis".

3.DETECT MALFUNCTIONING ITEM

Check pressure control solenoid valve A (line pressure solenoid valve). Refer to CVT-93, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED
SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to CVT-75, CVT-70.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.DETECT MALFUNCTIONING ITEM

Check the following:
Power supply and ground circuit for TCM. Refer to CVT-122, "Wiring Diagram - CVT - POWER".
The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace damaged parts.

6.CHECK DTC
Perform CVT-95, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> Replace the transaxle assembly or TCM. Refer to CVT-187, "Removal and Installation
(MR20DE)".

Revision: July 2007

CVT-96

2008 Sentra

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC

PRESSURE SOLENOID VALVE)
Description

INFOID:0000000001851058

The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM.
CVT

CONSULT-III Reference Value

INFOID:0000000001851059

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

SEC PRESS

N position idle

0.5 MPa

On Board Diagnosis Logic

INFOID:0000000001851060

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0776 PRS CNT SOL/B FCTN with CONSULT-III is detected when secondary
pressure is too high or too low compared with the commanded value while driving.

Possible Cause

INFOID:0000000001851061

Harness or connectors
(Solenoid circuit is open or shorted.)
Pressure control solenoid valve B (Secondary pressure solenoid valve system)
Transmission fluid pressure sensor A (Secondary pressure sensor)
Line pressure control system

DTC Confirmation Procedure

INFOID:0000000001851062

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 30 consecutive seconds.
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If DTC is detected, go to CVT-97, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Diagnosis Procedure

INFOID:0000000001851063

1.CHECK INPUT SIGNAL

With CONSULT-III
1. Start engine.
2. Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
3. Start vehicle and read out the value of SEC PRESS.

Revision: July 2007

CVT-97

2008 Sentra

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >
Item name

Condition

Display value (Approx.)

SEC PRESS

N position idle

0.5 MPa

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK LINE PRESSURE

Perform line pressure test. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts. Refer to CVT-35, "Inspections before Trouble Diagnosis".

3.DETECT MALFUNCTIONING ITEM

Check the following:
Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to CVT-102, "Component
Inspection".
Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-93, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYSTEM

Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to CVT-109.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.DETECT MALFUNCTIONING ITEM

Check the following:
Power supply and ground circuit for TCM. Refer to CVT-122, "Wiring Diagram - CVT - POWER".
The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace damaged parts.

6.CHECK DTC
Perform CVT-97, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Revision: July 2007

CVT-98

2008 Sentra

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC

PRESSURE SOLENOID VALVE)
Description

INFOID:0000000001851064

The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the oil pump discharge
pressure to suit the driving condition in response to a signal sent from the TCM.
CVT

CONSULT-III Reference Value

INFOID:0000000001851065

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

ISOLT3

Secondary pressure low - Secondary pressure high

0.8 - 0.0 A

N position idle

0.6 - 0.7 A

When stalled

0.4 - 0.6 A

SOLMON3

On Board Diagnosis Logic

INFOID:0000000001851066

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0778 PRS CNT SOL/B CIRC with CONSULT-III is detected under the following
conditions.
- TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

INFOID:0000000001851067

Harness or connectors
(Solenoid circuit is open or shorted.)
Pressure control solenoid valve B (Secondary pressure solenoid valve)

DTC Confirmation Procedure

I
INFOID:0000000001851068

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and wait at least 5 seconds.
If DTC is detected, go to CVT-101, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-99

2008 Sentra

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >

Wiring Diagram - CVT - SECPSV

INFOID:0000000001851069

BCWA0743E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-100

2008 Sentra

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851070

1. CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out the value of ISOLT3.

CVT
Item name

Condition

Display value (Approx.)

ISOLT3

Secondary pressure low Secondary pressure high

0.8 - 0.0 A

1.
2.

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminal and ground.
Name

Pressure
control solenoid
valve B
(Secondary pressure
solenoid
valve)

Connector

F23

Terminal

39 - ground

Condition

Voltage
(Approx.)

Release your foot from

the accelerator pedal.

5.0 - 7.0 V

Press the accelerator

pedal all the way down.

3.0 - 4.0 V

3. Turn ignition switch OFF.

4. Disconnect TCM connector.
5. Check if there is continuity between connector terminal and ground.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check resistance between TCM connector terminal and ground.

M
Solenoid valve

Connector

Terminal

Resistance (Approx.)

Pressure control solenoid

valve B (Secondary pressure solenoid valve)

F23

39 - Ground

3.0 - 9.0

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.

O
SCIA8189E

3.CHECK VALVE RESISTANCE

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-101

2008 Sentra

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.
Solenoid valve

Connector

Terminal

Resistance (Approx.)

F46

3 - Ground

3.0 - 9.0

Pressure control solenoid

valve B (Secondary pressure solenoid valve)

OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

SCIA4688E

4.CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE B (SECONDARY
PRESSURE SOLENOID VALVE)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and CVT unit harness connector (B).
3. Check continuity between TCM connector (A) terminal and CVT
unit harness connector (B) terminal.
Item

Connector

Terminal

TCM connector

F23

39

CVT unit harness connector

F46

Continuity
Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

SCIA8190E

5.CHECK DTC
Perform CVT-99, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> 1. Repair or replace damaged parts.
2. Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Component Inspection

INFOID:0000000001851071

PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-102

2008 Sentra

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE SOLENOID VALVE)
< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.
Solenoid Valve

Connector

Terminal

Resistance (Approx.)

Pressure control solenoid valve B (Secondary

pressure solenoid valve)

F46

3 - Ground

3.0 - 9.0

4.

CVT

If NG, replace the transaxle assembly. Refer to CVT-187,

"Removal and Installation (MR20DE)".

SCIA4688E

Revision: July 2007

CVT-103

2008 Sentra

DTC P0826 MANUAL MODE SWITCH CIRCUIT

< SERVICE INFORMATION >

DTC P0826 MANUAL MODE SWITCH CIRCUIT

Description

INFOID:0000000001851072

TCM sends the switch signals to combination meter via CAN communication line. Then manual mode switch
position is indicated on the CVT position indicator. For inspection, refer to CVT-106, "Diagnosis Procedure"

CONSULT-III Reference Value in Data Monitor Mode

Item name
MMODE

NON MMODE

STRDWN SW

STRUP

INFOID:0000000001851073

Condition

Display value

When manual mode

ON

Other than the above

OFF

When manual mode

OFF

Other than the above

ON

Steering shift switch: - side

ON

Other than the above

OFF

Steering shift switch: + side

ON

Other than the above

OFF

On Board Diagnosis Logic

INFOID:0000000001851074

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P0826 MANUAL MODE SWITCH with CONSULT-III is detected when TCM monitors Manual mode, Non manual mode, Up or Down switch signal, and then detects irregular with impossible
input pattern for 1 second or more.

Possible Cause

INFOID:0000000001851075

Harness or connectors
(These switches circuit is open or shorted.)
(TCM, and combination meter circuit are open or shorted.)
(CAN communication line is open or shorted.)
Manual mode select switch.
Manual mode position select switch.

DTC Confirmation Procedure

INFOID:0000000001851076

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.
5.
6.

Turn ignition switch ON. (Do not start engine.)

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine.
Push manual mode switch.
Drive vehicle for at least 2 consecutive seconds.
If DTC is detected, go toCVT-106, "Diagnosis Procedure".

Revision: July 2007

CVT-104

2008 Sentra

DTC P0826 MANUAL MODE SWITCH CIRCUIT

< SERVICE INFORMATION >

Wiring Diagram - CVT - MMSW

INFOID:0000000001851077

CVT

P
BCWA0761E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-105

2008 Sentra

DTC P0826 MANUAL MODE SWITCH CIRCUIT

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851078

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Check CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK MANUAL MODE SWITCH SIGNALS

1.
2.
3.

With CONSULT-III
Turn ignition switch ON. (Do not start engine.)
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out ON/OFF switching action of the STRDWNSW, STRUPSW, NONMMODE, MMODE.

Item name
MMODE

NONMMODE

STRDWNSW

STRUPSW

Condition

Display value

When manual mode

ON

Other than the above

OFF

When manual mode

OFF

Other than the above

ON

Steering shift switch: - side

ON

Other than the above

OFF

Steering shift switch: + side

ON

Other than the above

OFF

Without CONSULT-III
Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of the
position mutually coincide when the selector lever is shifted to the + (up) or - (down) side (1st 6th gear).
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 3.

3.CHECK STEERING SHIFT SWITCH AND MANUAL MODE SWITCH

Check steering shift switch and manual mode switch. Refer to CVT-108, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK BETWEEN STEERING SHIFT SWITCH AND COMBINATION METER

1.
2.
3.

Turn ignition switch OFF.

Disconnect spiral cable harness connector and combination meter harness connector.
Check continuity between spiral cable harness connector terminals and combination meter harness connector terminals.
Item

4.

Connector

Terminal

Spiral cable harness connector

M30

25

Combination meter harness connector

M24

38

Spiral cable harness connector

M30

31

Combination meter harness connector

M24

40

Spiral cable harness connector

M30

33

Combination meter harness connector

M24

39

Continuity
Yes

Yes

Yes

If OK, check harness for short to ground and short to power.

Revision: July 2007

CVT-106

2008 Sentra

DTC P0826 MANUAL MODE SWITCH CIRCUIT

< SERVICE INFORMATION >
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged harness.

5.CHECK BETWEEN MANUAL MODE SWITCH AND COMBINATION METER

1.
2.

3.

Disconnect manual mode select switch harness connector.

Check continuity between manual mode select switch harness connector terminals and combination
meter harness connector terminals.
Item

Connector

Terminal

Manual mode select switch harness connector

M103

Combination meter harness connector

M24

37

Manual mode select switch harness connector

M103

Combination meter harness connector

M24

38

CVT

Continuity

Yes

Yes

Check continuity between manual mode select switch harness connector and ground.
F
Item

Connector

Terminal

Continuity

Manual mode select switch harness connector

M103

3 - ground

Yes

4. If OK, check harness for short to ground and short to power.

OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace damaged harness.

6.CHECK SPIRAL CABLE

1.
2.

Disconnect spiral cable connector.

Check continuity between spiral cable connector terminals.
Item

Spiral cable connector

Connector

Terminal

M78

15

M30

33

M17

17

M31

31

M19

19

M25

25

Continuity

Yes

K
Yes

Yes

OK or NG
OK
>> GO TO 7.
NG
>> Replace spiral cable. Refer to SRS-32.

7.CHECK COMBINATION METER

Check combination meter. Refer to DI-13, "Self-Diagnosis Mode of Combination Meter".

OK or NG?
YES >> GO TO 8.
NO
>> Replace combination meter. Refer to DI-22, "Removal and Installation".

8.CHECK DTC
P

Perform DTC Confirmation Procedure. Refer to CVT-104, "DTC Confirmation Procedure".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 9.

9.CHECK TCM
1.

Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-107

2008 Sentra

DTC P0826 MANUAL MODE SWITCH CIRCUIT

< SERVICE INFORMATION >
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000001851079

STEERING SHIFT SWITCH

Check continuity between spiral cable connector terminals.
Terminals
15 - 19

17 - 19

Operation

Continuity

While pushing steering shift switch (+ side)

Yes

Other condition

No

While pushing steering shift switch (- side)

Yes

Other condition

No

MANUAL MODE SWITCH

Check continuity between manual mode select switch harness connector terminals.
Terminals
1-3

2-3

Revision: July 2007

Operation

Continuity

When manual mode

No

Other condition

Yes

When not in manual mode

Yes

Other condition

No

CVT-108

2008 Sentra

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC

PRESSURE SENSOR)
< SERVICE INFORMATION >

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT

(SEC PRESSURE SENSOR)
Description

INFOID:0000000001851080

The transmission fluid pressure sensor A (secondary pressure sensor) detects secondary pressure of CVT
and sends TCM the signal.
CVT

CONSULT-III Reference Value

INFOID:0000000001851081

Remarks: Specification data are reference values.

Item name
SEC HYDR SEN
SEC PRESS

Condition

Display value (Approx.)

N position idle

On Board Diagnosis Logic

1.0 V
1.3 MPa

E
INFOID:0000000001851082

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0840 TR PRS SENS/A CIRC with CONSULT-III is detected when TCM detects
an improper voltage drop when it receives the sensor signal.

Possible Cause

INFOID:0000000001851083

Transmission fluid pressure sensor A (Secondary pressure sensor)

Harness or connectors
(Switch circuit is open or shorted.)

DTC Confirmation Procedure

H
INFOID:0000000001851084

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.
4.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Make sure that output voltage of line temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (cool down the fluid)
Start engine and wait for at least 5 consecutive seconds.
If DTC is detected, go to CVT-111, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-109

2008 Sentra

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC

PRESSURE SENSOR)
< SERVICE INFORMATION >

Wiring Diagram - CVT - SECPS

INFOID:0000000001851085

BCWA0744E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-110

2008 Sentra

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC

PRESSURE SENSOR)
< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851086

1.CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of SEC HYDR SEN.

CVT
Item name

Condition

Display value (Approx.)

SEC HYDR SEN

N position idle

1.0 V

1.
2.

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminal and ground.
Name

Connector

Terminal

Condition

Voltage
(Approx.)

Transmission
fluid pressure
sensor A
(Secondary
pressure sensor)

F23

15 - Ground

N position idle

1.0 V

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK HARNESS BETWEEN TCM AND TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and CVT unit harness connector (B).
3. Check continuity between TCM connector (A) terminal and CVT
unit harness connector (B) terminal.
Item

Connector

Terminal

TCM connector

F23

15

CVT unit harness connector

F46

23

Continuity

L
YES

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground and short to power harness or connectors.

M
SCIA8194E

3. CHECK HARNESS BETWEEN TCM AND CVT UNIT HARNESS CONNECTOR (SENSOR POWER AND
SENSOR GROUND)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and CVT unit harness connector (B).

Revision: July 2007

CVT-111

2008 Sentra

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC

PRESSURE SENSOR)
< SERVICE INFORMATION >
3. Check continuity between TCM connector (A) terminals and
CVT unit harness connector (B) terminals.
Item

Connector

Terminal

TCM

F23

26

CVT unit harness connector

F46

20

TCM

F23

25

CVT unit harness connector

F46

19

Continuity
Yes

Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

SCIA8193E

4.CHECK SENSOR POWER AND SENSOR GROUND

1.
2.
3.

Turn ignition switch ON.

Disconnect CVT unit harness connector.
Check voltage between CVT unit harness connector terminal.
Item

CVT unit harness connector (vehicle side)

Connector

Terminal

Data (Approx.)

F46

19 - 20

5.0 V

OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187.
NG
>> Replace TCM. Refer to CVT-165, "Removal and Installation".

5.CHECK DTC
Perform CVT-109, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-112

2008 Sentra

DTC P0841 PRESSURE SENSOR FUNCTION

< SERVICE INFORMATION >

DTC P0841 PRESSURE SENSOR FUNCTION

Description

INFOID:0000000001851087

Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signal, TCM changes the operating pressure of the primary pulley and the secondary pulley and changes the groove width of the pulley to control the gear ratio.

CONSULT-III Reference Value

INFOID:0000000001851088

CVT

Remarks: Specification data are reference values.

Item name
PRI HYDR SEN
SEC HYDR SEN

Condition

Display value (Approx.)

0.7 - 3.5 V

N position idle

1.0 V

On Board Diagnosis Logic

INFOID:0000000001851089

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P0841 PRESS SEN/FNCTN with CONSULT-III is detected when correlation
between the values of the secondary pressure sensor and the primary pressure sensor is out of specification.

Possible Cause

INFOID:0000000001851090

Transmission fluid pressure sensor A (Secondary pressure sensor)

Transmission fluid pressure sensor B (Primary pressure sensor)
Harness or connectors
(Sensor circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851091

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 12 consecutive seconds.
VEHICLE SPEED: 40 km/h (25 MPH) More than
RANGE: D position
If DTC is detected, go to CVT-113, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001851092

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".

Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Check CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK INPUT SIGNALS

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of SEC HYDR SEN and PRI HYDR SEN.

Revision: July 2007

CVT-113

2008 Sentra

DTC P0841 PRESSURE SENSOR FUNCTION

< SERVICE INFORMATION >
Item name
PRI HYDR SEN
SEC HYDR SEN

1.
2.

Condition

Display value (Approx.)

N position idle

0.7 - 3.5 V
1.0 V

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminals and ground.
Name

Transmission fluid
pressure sensor B
(Primary pressure sensor)
Transmission fluid
pressure sensor A
(Secondary pressure sensor)

Connector

Terminal

Condition

14 - Ground
F23

Voltage
(Approx.)

0.7 - 3.5 V
N position idle

15 - Ground

1.0 V

OK or NG
OK
>> GO TO 6.
NG
>> GO TO 3.

3.CHECK LINE PRESSURE

Perform line pressure test. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts. Refer to CVT-35, "Inspections before Trouble Diagnosis".

4.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYSTEM AND TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system and transmission fluid pressure sensor B (primary pressure sensor) system. Refer to CVT-109, CVT-115.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.DETECT MALFUNCTIONING ITEM

Check the following:
Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-93, "Component Inspection".
Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to CVT-102, "Component
Inspection".
Step motor. Refer to CVT-141, "Component Inspection".
OK or NG6
OK
>> GO TO 6.
NG
>> Repair or replace damaged parts.

6.CHECK DTC
Perform CVT-113, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> Replace TCM or transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Revision: July 2007

CVT-114

2008 Sentra

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI

PRESSURE SENSOR)
< SERVICE INFORMATION >

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI

PRESSURE SENSOR)
Description

INFOID:0000000001851093

The transmission fluid pressure sensor B (primary pressure sensor) detects primary pressure of CVT and
sends TCM the signal.
CVT

CONSULT-III Reference Value

INFOID:0000000001851094

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

PRI HYDR SEN

N position idle

0.7 - 3.5 V

On Board Diagnosis Logic

INFOID:0000000001851095

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P0845 TR PRS SENS/B CIRC with CONSULT-III is detected under the following
conditions.
- When TCM detects an improper voltage drop when it receives the sensor signal.
- When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

G
INFOID:0000000001851096

Transmission fluid pressure sensor B (Primary pressure sensor)

Harness or connectors
(Sensor circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851097

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.
4.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Make sure that output voltage of line temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (cool down the fluid)
Start engine and wait for at least 5 consecutive seconds.
If DTC is detected, go to CVT-117, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.
N

Revision: July 2007

CVT-115

2008 Sentra

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI

PRESSURE SENSOR)
< SERVICE INFORMATION >

Wiring Diagram - CVT - PRIPS

INFOID:0000000001851098

BCWA0745E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-116

2008 Sentra

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI

PRESSURE SENSOR)
< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851099

1.CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Start engine.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of PRI HYDR SEN.

CVT
Item name

Condition

Display value (Approx.)

PRI HYDR SEN

N position idle

0.7 - 3.5 V

1.
2.

Without CONSULT-III
Start engine.
Check voltage between TCM connector terminal and ground.
Name

Connector

Terminal

Condition

Voltage
(Approx.)

F23

14 - Ground

N position idle

0.7 - 3.5 V

Transmission fluid
pressure
sensor B
(Primary
pressure
sensor)

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK HARNESS BETWEEN TCM AND TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and CVT unit harness connector (B).
3. Check continuity between TCM connector (A) terminal and CVT
unit harness connector (B) terminal.
Item

Connector

Terminal

TCM connector

F23

14

CVT unit harness connector

F46

25

Continuity

YES

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground and short to power harness or connectors.

SCIA8197E

3. CHECK HARNESS BETWEEN TCM AND CVT UNIT HARNESS CONNECTOR (SENSOR POWER AND
SENSOR GROUND)
1. Turn ignition switch OFF.
2. Disconnect TCM connector (A) and CVT unit harness connector (B).

Revision: July 2007

CVT-117

2008 Sentra

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI

PRESSURE SENSOR)
< SERVICE INFORMATION >
3. Check continuity between TCM connector (A) terminals and
CVT unit harness connector (B) terminals.
Item

Connector

Terminal

TCM

F23

26

CVT unit harness connector

F46

20

TCM

F23

25

CVT unit harness connector

F46

19

Continuity
Yes

Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

SCIA8193E

4.CHECK SENSOR POWER AND SENSOR GROUND

1.
2.
3.

Turn ignition switch ON.

Disconnect CVT unit harness connector.
Check voltage between CVT unit harness connector terminal.
Item

CVT unit harness connector (vehicle side)

Connector

Terminal

Data (Approx.)

F46

19 - 20

5.0 V

OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187.
NG
>> Replace TCM. Refer to CVT-165, "Removal and Installation".

5.CHECK DTC
Perform CVT-115, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-118

2008 Sentra

DTC P0868 SECONDARY PRESSURE DOWN

< SERVICE INFORMATION >

DTC P0868 SECONDARY PRESSURE DOWN

Description

INFOID:0000000001851100

The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM.

CONSULT-III Reference Value

INFOID:0000000001851101

CVT
Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

SEC PRESS

N position idle

0.5 MPa

On Board Diagnosis Logic

D
INFOID:0000000001851102

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P0868 SEC/PRESS DOWN with CONSULT-III is detected when secondary fluid
pressure is too low compared with the commanded value while driving.

Possible Cause

F
INFOID:0000000001851103

Harness or connectors
(Solenoid circuit is open or shorted.)
Pressure control solenoid valve B (Secondary pressure solenoid valve) system
Transmission fluid pressure sensor A (Secondary pressure sensor)
Line pressure control system

DTC Confirmation Procedure

H
INFOID:0000000001851104

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.

4.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (cool down the fluid)
Start engine and maintain the following conditions for at least 10 consecutive seconds.
VEHICLE SPEED (accelerate slowly): 0 50 km/h (31 MPH)
ACC PEDAL OPEN: 0.5/8 - 1.0/8
RANGE: D position
If DTC is detected, go to CVT-119, "Diagnosis Procedure".

Diagnosis Procedure

With CONSULT-III
Start engine.
Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of SEC PRESS.

Item name

Condition

Display value (Approx.)

SEC PRESS

N position idle

0.5 MPa

OK or NG
OK
>> GO TO 5.
Revision: July 2007

INFOID:0000000001851105

1.CHECK INPUT SIGNAL

1.
2.
3.

CVT-119

2008 Sentra

DTC P0868 SECONDARY PRESSURE DOWN

< SERVICE INFORMATION >
NG
>> GO TO 2.

2.CHECK LINE PRESSURE

Perform line pressure test. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts. Refer to CVT-35, "Inspections before Trouble Diagnosis".

3.DETECT MALFUNCTIONING ITEM

Check the following:
Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to CVT-102, "Component
Inspection".
Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-93, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYSTEM

Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to CVT-109.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.DETECT MALFUNCTIONING ITEM

Check the following:
Power supply and ground circuit for TCM. Refer to CVT-122, "Wiring Diagram - CVT - POWER".
The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace damaged parts.

6.CHECK DTC
Perform CVT-119, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Revision: July 2007

CVT-120

2008 Sentra

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

< SERVICE INFORMATION >

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

Description

INFOID:0000000001851106

When the power supply to the TCM is cut OFF, for example because the battery is removed, and the self-diag- B
nosis memory function stops, malfunction is detected.
NOTE:
Since P1701 TCM-POWER SUPPLY will be indicated when replacing TCM, perform diagnosis after
CVT
erasing SELF-DIAG RESULTS

On Board Diagnosis Logic

INFOID:0000000001851107

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P1701 TCM-POWER SUPPLY with CONSULT-III is detected when TCM does not
receive the voltage signal from the battery power supply.
This is not a malfunction message. (Whenever shutting OFF a power supply to the TCM, this message
appears on the screen.)

Possible Cause

INFOID:0000000001851108

Harness or connectors
(Battery or ignition switch and TCM circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851109

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON. (Do not start engine.)

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Wait for at least 2 consecutive seconds.
If DTC is detected, go to CVT-123, "Diagnosis Procedure".

Revision: July 2007

CVT-121

2008 Sentra

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

< SERVICE INFORMATION >

Wiring Diagram - CVT - POWER

INFOID:0000000001851110

BCWA0746E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-122

2008 Sentra

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851111

1.CHECK DTC
1. Turn ignition switch ON.
2. Select SELF-DIAG RESULTS mode for TRANSMISSION with CONSULT-III.
3. Erase self-diagnostic results. Refer to CVT-24, "OBD-II Diagnostic Trouble Code (DTC)".
4. Turn ignition switch OFF, and wait for 5 seconds or more.
5. Start engine.
6. Confirm self-diagnostic results again. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is the P1701 TCM-POWER SUPPLY displayed?
YES >> GO TO 2.
NO
>> INSPECTION END

CVT

2.CHECK TCM POWER SOURCE, STEP 1

1.
2.

Turn ignition switch OFF.

Check voltage between TCM connector terminal and ground.
Name

Connector

Power supply
(memory backup)

F23

Terminal

Condition

Voltage
(Approx.)

Always

Battery
voltage

45 - Ground
47 - Ground

OK or NG
OK
>> GO TO 3.
NG
>> GO TO 4.

3.CHECK TCM POWER SOURCE, STEP 2

1.
2.

Turn ignition switch ON.

Check voltage between TCM connector terminals and ground.
J
Name

Connector

Terminal

Condition

Voltage
(Approx.)

Battery
voltage
Power supply

46 - Ground

L
0V

Power supply

Battery
voltage

F23
48 - Ground

N
0V
Power supply
(memory backup)

45 - Ground
47 - Ground

Always

Battery
voltage

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.

4.DETECT MALFUNCTIONING ITEM

Check the following.
Harness for short or open between battery and TCM connector terminal 45, 47
Harness for short or open between ignition switch and TCM connector terminal 46, 48
Revision: July 2007

CVT-123

2008 Sentra

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

< SERVICE INFORMATION >
10 A fuse (No.49, located in the IPDM E/R)
20 A fuse (No.53, located in the IPDM E/R)
Ignition switch. Refer to PG-3.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.CHECK TCM GROUND CIRCUIT

1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector.
Check continuity between TCM connector terminals and ground.
Name

Connector

Ground

F23

Terminal

Continuity

5 - Ground

Yes

42 - Ground

OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

6.CHECK DTC
Perform CVT-121, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-124

2008 Sentra

DTC P1705 THROTTLE POSITION SENSOR

< SERVICE INFORMATION >

DTC P1705 THROTTLE POSITION SENSOR

Description

INFOID:0000000001851112

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN
communication.

CONSULT-III Reference Value

INFOID:0000000001851113

CVT

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

ACC PEDAL OPEN

Released accelerator pedal - Fully depressed accelerator pedal

0.0/8 - 8.0/8

On Board Diagnosis Logic

INFOID:0000000001851114

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P1705 TP SEN/CIRC A/T with CONSULT-III is detected when TCM does not
receive the proper accelerator pedal position signals (input by CAN communication) from ECM.

Possible Cause

DTC Confirmation Procedure

INFOID:0000000001851116

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Depress accelerator pedal fully and release it, then wait for 5 seconds.
If DTC is detected, go to CVT-125, "Diagnosis Procedure".

Diagnosis Procedure

K
INFOID:0000000001851117

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Check the CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK INPUT SIGNAL

1.
2.
3.

INFOID:0000000001851115

ECM
Harness or connectors
(CAN communication line is open or shorted.)

1.
2.
3.
4.

With CONSULT-III
Turn ignition switch ON.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out the value of ACC PEDAL OPEN.

P
Item name

Condition

ACC PEDAL OPEN

Release accelerator pedal.

Fully depressed accelerator pedal

Display value (Approx.)

0.0/8

8.0/8

OK or NG
Revision: July 2007

CVT-125

2008 Sentra

DTC P1705 THROTTLE POSITION SENSOR

< SERVICE INFORMATION >
OK
>> GO TO 4.
NG
>> GO TO 3.

3.CHECK DTC WITH ECM

With CONSULT-III
Turn ignition switch ON.
Select SELF-DIAG RESULTS mode for ENGINE with CONSULT-III. Refer to EC-113, "CONSULT-III
Function (ENGINE)".
OK or NG
OK
>> GO TO 4.
NG
>> Check the DTC Detected Item. Go to EC-113, "CONSULT-III Function (ENGINE)".

1.
2.

4.CHECK DTC
Perform CVT-125, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-126

2008 Sentra

DTC P1722 ESTM VEHICLE SPEED SIGNAL

< SERVICE INFORMATION >

DTC P1722 ESTM VEHICLE SPEED SIGNAL

Description

INFOID:0000000001851118

The vehicle speed signal is transmitted from ABS actuator and electric unit (control unit) to TCM by CAN communication line.

CONSULT-III Reference Value

INFOID:0000000001851119

CVT
Remarks: Specification data are reference values.

Item name
ESTM VSP SIG
VEHICLE SPEED

Condition

Display value

During driving

Approximately matches the speedometer reading.

On Board Diagnosis Logic

INFOID:0000000001851120

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P1722 ESTM VEH SPD SIG with CONSULT-III is detected when TCM does not
receive the proper vehicle speed signal (input by CAN communication) from ABS actuator and electric unit
(control unit).

Possible Cause

INFOID:0000000001851121

Harness or connectors
(Sensor circuit is open or shorted.)
ABS actuator and electric unit (control unit)

DTC Confirmation Procedure

INFOID:0000000001851122

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 5 consecutive seconds.
ACC PEDAL OPEN: 1.0/8 or less
VEHICLE SPEED SE: 30 km/h (19 MPH) or more
If DTC is detected, go to CVT-127, "Diagnosis Procedure".

Diagnosis Procedure

M
INFOID:0000000001851123

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".

Is any malfunction of the U1000 CAN COMM CIRCUIT indicated?
YES >> Check CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Perform ABS actuator and electric unit (control unit) self-diagnosis check. Refer to BRC-18, "CONSULT-III
Function (ABS)".
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-127

2008 Sentra

DTC P1722 ESTM VEHICLE SPEED SIGNAL

< SERVICE INFORMATION >

3.CHECK INPUT SIGNALS

1.
2.
3.

With CONSULT-III
Start engine.
Select SELECTION FROM MENU in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Drive vehicle and read out the value of VEHICLE SPEED and ESTM VSP SIG.

Item name
ESTM VSP SIG
VEHICLE SPEED

4.

Condition

Display value

During driving

Approximately matches
the speedometer reading.

Check if there is a great difference between the two values.

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.

4.CHECK TCM
Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.CHECK DTC
Perform CVT-127, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.

Revision: July 2007

CVT-128

2008 Sentra

DTC P1723 CVT SPEED SENSOR FUNCTION

< SERVICE INFORMATION >

DTC P1723 CVT SPEED SENSOR FUNCTION

Description

A
INFOID:0000000001851124

The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of the B
parking gear and generates a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle
speed.
The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a sigCVT
nal to the TCM.

On Board Diagnosis Logic

INFOID:0000000001851125

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P1723 CVT SPD SEN/FNCTN with CONSULT-III is detected when there is a great
difference between the vehicle speed signal and the secondary speed sensor signal.
CAUTION:
One of the P0720 VEH SPD SEN/CIR AT, the P0715 INPUT SPD SEN/CIRC or the P0725 ENGINE
SPEED SIG is displayed with the DTC at the same time.

Possible Cause

INFOID:0000000001851126

Harness or connectors
(Sensor circuit is open or shorted.)
Output speed sensor (Secondary speed sensor)
Input speed sensor (Primary speed sensor)
Engine speed signal system

DTC Confirmation Procedure

H
INFOID:0000000001851127

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 5 consecutive seconds.
VEHICLE SPEED SE: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
ENG SPEED: 450 rpm or more
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If DTC is detected, go to CVT-129, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001851128

1.CHECK STEP MOTOR FUNCTION

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".

Is a malfunction in the step motor function indicated in the results?
YES >> Repair or replace damaged parts. (Check the step motor function. Refer to CVT-142.)
NO
>> GO TO 2.

2.CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR SYSTEM) AND INPUT SPEED
SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to CVT-75, CVT-70.
OK or NG
Revision: July 2007

WITH CONSULT-III
1.
2.

CVT-129

2008 Sentra

DTC P1723 CVT SPEED SENSOR FUNCTION

< SERVICE INFORMATION >
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.

3.CHECK ENGINE SPEED SIGNAL SYSTEM

Check engine speed signal system. Refer to CVT-80.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts. Refer to EC-505.

4.DETECT MALFUNCTIONING ITEM

Check the following:
Power supply and ground circuit for TCM. Refer to CVT-121.
The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.

5.CHECK DTC
Perform CVT-129, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> Replace TCM or transaxle assembly. Refer to CVT-8, "Service After Replacing TCM and Transaxle Assembly", CVT-187, "Removal and Installation (MR20DE)".

Revision: July 2007

CVT-130

2008 Sentra

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

< SERVICE INFORMATION >

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

Description

A
INFOID:0000000001851129

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN
communication.

On Board Diagnosis Logic

INFOID:0000000001851130

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P1726 ELEC TH CONTROL with CONSULT-III is detected when the electronically
controlled throttle for ECM is malfunctioning.

Possible Cause

CVT

INFOID:0000000001851131

Harness or connectors
(Sensor circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851132

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and let it idle for 5 second.
If DTC is detected, go to CVT-131, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001851133

With CONSULT-III
Turn ignition switch ON.
Select SELF-DIAG RESULTS mode for ENGINE with CONSULT-III. Refer to EC-113, "CONSULT-III
Function (ENGINE)".
OK or NG
OK
>> GO TO 2.
NG
>> Check the DTC Detected Item. Refer to EC-113, "CONSULT-III Function (ENGINE)".
If CAN communication line is detected, go to CVT-54.

1.CHECK DTC WITH ECM

1.
2.

2.CHECK DTC
Perform CVT-131, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.

3.DETECT MALFUNCTIONING ITEM

Check the following:
The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace TCM. Refer to CVT-8, "Service After Replacing TCM and Transaxle Assembly".
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-131

2008 Sentra

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

< SERVICE INFORMATION >

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

Description

INFOID:0000000001851134

The lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake
pressure).
When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON.

CONSULT-III Reference Value

Item name
LUSEL SOL OUT

LUSEL SOL MON

INFOID:0000000001851135

Condition

Display value

Selector lever in P and N positions

ON

Wait at least for 5 seconds with the selector lever

in R, D and L positions

OFF

Selector lever in P, N positions

ON

Wait at least for 5 seconds with the selector lever

in R, D or L position

OFF

On Board Diagnosis Logic

INFOID:0000000001851136

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P1740 LU-SLCT SOL/CIRC with CONSULT-III is detected under the following conditions.
- When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

INFOID:0000000001851137

Lock-up select solenoid valve

Harness or connectors
(Solenoid circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851138

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.
4.

Turn ignition switch ON.

Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 5 consecutive seconds.
RANGE: D position and N position
(At each time, wait for 5 seconds.)
If DTC is detected, go to CVT-134, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-132

2008 Sentra

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

< SERVICE INFORMATION >

Wiring Diagram - CVT - L/USSV

INFOID:0000000001851139

CVT

P
BCWA0747E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-133

2008 Sentra

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851140

1. CHECK INPUT SIGNAL

1.
2.
3.

With CONSULT-III
Turn ignition switch ON.
Select SELECTION FROM MENU in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out the value of LUSEL SOL OUT and LUSEL SOL MON.

Item name

LUSEL SOL OUT

LUSEL SOL MON

1.
2.

Condition

Display value

Selector lever in P and N

positions

ON

Wait at least for 5 seconds

with the selector lever in
R, D and L positions

OFF

Selector lever in P and N

positions

ON

Wait at least for 5 seconds

with the selector lever in
R, D and L positions

OFF

Without CONSULT-III
Turn ignition switch ON.
Check voltage between TCM connector terminal and ground.
Name

Lock-up
select solenoid valve

Connector

F23

Terminal

37 - Ground

Condition

Voltage
(Approx.)

Selector lever in P and

N positions

Battery
voltage

Wait at least for 5 seconds with the selector lever in R, D and L

positions

0V

3. Turn ignition switch OFF.

4. Disconnect the TCM connector.
5. Check if there is continuity between connector terminal and ground.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 2.

2.CHECK LOCK-UP SELECT SOLENOID VALVE CIRCUIT

1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector.
Check resistance between TCM connector terminal and ground.
Solenoid valve

Lock-up select solenoid

valve

Connector

Terminal

Resistance (Approx.)

F23

37 - Ground

17 - 38

OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
SCIA8203E

3.CHECK VALVE RESISTANCE

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-134

2008 Sentra

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.

Solenoid valve
Lock-up select solenoid valve

Connector

Terminal

Resistance (Approx.)

F46

13 - Ground

17 - 38

OK or NG
OK
>> GO TO 4.
NG
>> Replace the transaxle assembly. Refer to CVT-187,
"Removal and Installation (MR20DE)".

CVT
SCIA4693E

4.CHECK HARNESS BETWEEN TCM AND LOCK-UP SELECT SOLENOID VALVE

1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector (A) and CVT harness connector (B).
Check continuity between TCM connector (A) terminal and CVT
unit harness connector (B) terminal.
Item

Connector

Terminal

TCM

F23

37

CVT unit harness connector

F46

13

Continuity
Yes

4. If OK, check harness for short to ground and short to power.

5. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

H
SCIA8204E

5.CHECK DTC

Perform CVT-132, "DTC Confirmation Procedure".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> 1. Repair or replace damaged parts.
2. Replace TCM. Refer to CVT-8, "Service After Replacing TCM and Transaxle Assembly".

Component Inspection

INFOID:0000000001851141

LOCK-UP SELECT SOLENOID VALVE

1.
2.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.

Revision: July 2007

CVT-135

2008 Sentra

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

< SERVICE INFORMATION >
3. Check resistance between CVT unit harness connector terminal
and ground.
Solenoid valve
Lock-up select solenoid valve

4.

Connector

Terminal

Resistance (Approx.)

F46

13 - Ground

17 - 38

If NG, replace the transaxle assembly. Refer to CVT-187,

"Removal and Installation (MR20DE)".
SCIA4693E

Revision: July 2007

CVT-136

2008 Sentra

DTC P1745 LINE PRESSURE CONTROL

< SERVICE INFORMATION >

DTC P1745 LINE PRESSURE CONTROL

Description

A
INFOID:0000000001851142

The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.

On Board Diagnosis Logic

INFOID:0000000001851143

CVT

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code P1745 L/PRESS CONTROL with CONSULT-III is detected when TCM detects the
unexpected line pressure.

Possible Cause

INFOID:0000000001851144

TCM

DTC Confirmation Procedure

INFOID:0000000001851145

NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (cool down the fluid)
If DTC is detected, go to CVT-137, "Diagnosis Procedure".

Diagnosis Procedure

INFOID:0000000001851146

1.CHECK DTC
1. Turn ignition switch ON.
2. Select SELF-DIAG RESULTS mode for TRANSMISSION with CONSULT-III.
3. Erase self-diagnostic results.
4. Turn ignition switch OFF, and wait for 10 seconds or more.
5. Start engine.
6. Confirm self-diagnostic results again. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is the P1745 L/PRESS CONTROL displayed?
YES >> Replace TCM. Refer to CVT-8, "Service After Replacing TCM and Transaxle Assembly".
NO
>> INSPECTION END

Revision: July 2007

CVT-137

2008 Sentra

DTC P1777 STEP MOTOR - CIRCUIT

< SERVICE INFORMATION >

DTC P1777 STEP MOTOR - CIRCUIT

Description

INFOID:0000000001851147

The step motor changes the step with turning 4 coils ON/OFF according to the signal from TCM. As a result,
the flow of line pressure to primary pulley is changed and pulley ratio is controlled

CONSULT-III Reference Value

INFOID:0000000001851148

Remarks: Specification data are reference values.

Item name

Condition

Display value (Approx.)

STM STEP

0 step - 177 step

SMCOIL A
SMCOIL B

During driving

SMCOIL C

Changes ONOFF.

SMCOIL D

On Board Diagnosis Logic

INFOID:0000000001851149

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P1777 STEP MOTR CIRC with CONSULT-III is detected under the following conditions.
- When operating step motor ON and OFF, there is no proper change in the voltage of TCM terminal which
corresponds to it.

Possible Cause

INFOID:0000000001851150

Step motor
Harness or connectors
(Step motor circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000001851151

CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.
3.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Drive vehicle for at least 5 consecutive seconds.
If DTC is detected, go to CVT-140, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-138

2008 Sentra

DTC P1777 STEP MOTOR - CIRCUIT

< SERVICE INFORMATION >

Wiring Diagram - CVT - STM

INFOID:0000000001851152

CVT

P
BCWA0748E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-139

2008 Sentra

DTC P1777 STEP MOTOR - CIRCUIT

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851153

1.CHECK INPUT SIGNALS

1.
2.
3.

With CONSULT-III
Start engine.
Select SELECTION FROM MENU in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start vehicle and read out the value of STM STEP, SMCOIL A, SMCOIL B, SMCOIL C, and
SMCOIL D.

Item name

Condition

Display value (Approx.)

STM STEP

0 step - 177 step

SMCOIL A
SMCOIL B

During driving

SMCOIL C

Changes ONOFF.

SMCOIL D

OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.

2.CHECK HARNESS BETWEEN TCM AND STEP MOTOR

1.
2.
3.

Turn ignition switch OFF.

Disconnect CVT unit connector and TCM connector (A).
Check continuity between TCM connector (A) terminals and
CVT unit harness connector (B) terminals.
Item

Connector

Terminal

TCM

F23

30

CVT unit harness connector

F46

TCM

F23

29

CVT unit harness connector

F46

TCM

F23

28

CVT unit harness connector

F46

TCM

F23

27

CVT unit harness connector

F46

Continuity
Yes

Yes

Yes

SCIA8205E

Yes

4. If OK, check harness for short to ground and short to power.

5. If OK, check continuity between body ground and CVT assembly.
6. Reinstall any part removed.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.

3.CHECK STEP MOTOR

Check step motor. Refer to CVT-141, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK DTC
Perform CVT-138, "DTC Confirmation Procedure".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 5.
Revision: July 2007

CVT-140

2008 Sentra

DTC P1777 STEP MOTOR - CIRCUIT

< SERVICE INFORMATION >

5.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000001851154

CVT

STEP MOTOR
1.
2.
3.

Turn ignition switch OFF.

Disconnect CVT unit harness connector.
Check resistance between CVT unit harness connector terminals and ground.
Name

Connector

Terminal
6-7
8-9

Step motor

F46

Resistance (Approx.)

30

6 - Ground
7 - Ground
8 - Ground

15

SCIA4696E

9 - Ground

4.

If NG, replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

Revision: July 2007

CVT-141

2008 Sentra

DTC P1778 STEP MOTOR - FUNCTION

< SERVICE INFORMATION >

DTC P1778 STEP MOTOR - FUNCTION

Description

INFOID:0000000001851155

The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of line
pressure to primary pulley is changed and pulley ratio is controlled.
This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
This diagnosis item is detected when the state of the changing the speed mechanism in unit does not operate normally.

CONSULT-III Reference Value

INFOID:0000000001851156

Remarks: Specification data are reference values.

Item name
STM STEP
GEAR RATIO

Condition

Display value (Approx.)

During driving

On Board Diagnosis Logic

0 step - 177 step

2.34 - 0.39
INFOID:0000000001851157

This is an OBD-II self-diagnostic item.

Diagnostic trouble code P1778 STEP MOTR/FNC with CONSULT-III is detected under the following conditions.
- When not changing the pulley ratio according to the instruction of TCM.

Possible Cause

INFOID:0000000001851158

Step motor

DTC Confirmation Procedure

INFOID:0000000001851159

CAUTION:
Always drive vehicle at a safe speed.
Before starting DTC Confirmation Procedure, confirm Hi or Mid or Low fixation by PRI
SPEED and VEHICLE SPEED on DATA MONITOR MODE.
If hi-geared fixation occurred, go to CVT-143, "Diagnosis Procedure".
NOTE:
If DTC Confirmation Procedure has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch ERASE on SELF-DIAG RESULTS and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1.
2.

3.
4.

5.

Turn ignition switch ON and select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (cool down the fluid)
Select DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Start engine and maintain the following conditions for at least 30 consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: D position
ENG SPEED: 450 rpm or more
If DTC is detected, go to CVT-143, "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Revision: July 2007

CVT-142

2008 Sentra

DTC P1778 STEP MOTOR - FUNCTION

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851160

1.CHECK STEP MOTOR

With CONSULT-III
B
It is monitoring whether GEAR RATIO: 2.34 - 0.39 changes similarly to STM STEP: 0 - 177 by DATA MONITOR mode. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Without CONSULT-III
Inspect the engine speed (rise and descend), vehicle speed, throttle position, and check shift change. Refer to CVT
CVT-193, "Vehicle Speed When Shifting Gears".
OK or NG
D
OK
>> INSPECTION END
NG
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
E

Revision: July 2007

CVT-143

2008 Sentra

OVERDRIVE CONTROL SWITCH

< SERVICE INFORMATION >

OVERDRIVE CONTROL SWITCH

Description

INFOID:0000000001851161

Overdrive control switch is installed to the selector lever.

O/D OFF indicator turns ON, and overdrive driving activates when pressing the overdrive control switch
while driving in D position. O/D OFF indicator turns OFF, and D position driving starts when pressing the
overdrive control switch while driving in the overdrive-off mode. Shifting the selector lever in any position
other than D releases the overdrive-off mode.

CONSULT-III Reference Value

Item name
SPORT MODE SW

Revision: July 2007

INFOID:0000000001851162

Condition

Display value

When OD OFF indicator lamp is off.

ON

When OD OFF indicator lamp is on.

OFF

CVT-144

2008 Sentra

OVERDRIVE CONTROL SWITCH

< SERVICE INFORMATION >

Wiring Diagram - CVT - ODSW

INFOID:0000000001851163

CVT

BCWA0749E

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

Revision: July 2007

CVT-145

2008 Sentra

OVERDRIVE CONTROL SWITCH

< SERVICE INFORMATION >

Diagnosis Procedure

INFOID:0000000001851164

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated in the results?
YES >> Check CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK OVERDRIVE CONTROL SWITCH SIGNAL

1.
2.
3.

With CONSULT-III
Turn ignition switch ON.
Select ECU INPUT SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III.
Read out ON/OFF switching action of the SPORT MODE SW.

Item name

Condition

Display value

SPORT MODE SW

While pushing overdrive

cancel switch

ON

Other conditions

OFF

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.

3.CHECK OVERDRIVE CONTROL SWITCH

Check overdrive control switch. Refer to CVT-147, "Component Inspection".
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK SELF-DIAGNOSTIC RESULTS (COMBINATION METER)

Perform self-diagnosis check. Refer toDI-13, "Self-Diagnosis Mode of Combination Meter" .
Is any malfunction detected by self-diagnostic?
YES >> Check the malfunctioning system.
NO - 1 >> With Intelligent Key: GO TO 5.
NO - 2 >> Without Intelligent Key: GO TO 6.

5.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT WITH INTELLIGENT KEY

1.
2.
3.

Turn ignition switch OFF.

Disconnect CVT device connector and combination meter connector.
Check continuity between CVT device harness connector (A)
terminal and combination meter harness connector (B) terminal.
Item

Connector

Terminal

CVT device harness connector

M38

Combination meter harness

connector

M24

29

Continuity
Yes

SCIA8206E

Revision: July 2007

CVT-146

2008 Sentra

OVERDRIVE CONTROL SWITCH

< SERVICE INFORMATION >
4. Check continuity between CVT device harness connector terminal and ground.
Item

Connector

Terminal

Continuity

CVT device harness connector

M38

2 - ground

Yes

5. If OK, check harness for short to ground and short to power.

6. Reinstall any part removed.
OK or NG
OK
>> INSPECTION END
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.

CVT
SCIA8207E

6.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT WITHOUT INTELLIGENT KEY

1.
2.
3.

Turn ignition switch OFF.

Disconnect CVT device connector and combination meter connector.
Check continuity between CVT device harness connector (A)
terminal and combination meter harness connector (B) terminal.
Item

Connector

Terminal

CVT device harness connector

M38

Combination meter harness

connector

M24

Continuity

Yes

29

H
SCIA8208E

4.

Check continuity between CVT device harness connector terminal and ground.
Item

Connector

Terminal

Continuity

CVT device harness connector

M38

2 - ground

Yes

5. If OK, check harness for short to ground and short to power.

6. Reinstall any part removed.
OK or NG
OK
>> INSPECTION END
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.

Component Inspection

L
SCIA8209E

INFOID:0000000001851165

OVERDRIVE CONTROL SWITCH

N

With Intelligent Key

Check continuity between CVT device harness connector terminals.

O
Item
Overdrive control
switch

Condition

Terminal

While pushing overdrive control switch

1-2

Other conditions

Continuity
Yes

P
No

WCIA0725E

Without Intelligent Key

Revision: July 2007

CVT-147

2008 Sentra

OVERDRIVE CONTROL SWITCH

< SERVICE INFORMATION >
Check continuity between CVT device harness connector terminals.
Item
Overdrive control
switch

Condition

Terminal

While pushing overdrive control switch

1-2

Other conditions

Continuity
Yes
No

WCIA0726E

Revision: July 2007

CVT-148

2008 Sentra

SHIFT POSITION INDICATOR CIRCUIT

< SERVICE INFORMATION >

SHIFT POSITION INDICATOR CIRCUIT

Description

INFOID:0000000001851166

TCM sends the switch signals to combination meter via CAN communication line. Then selector lever position
is indicated on the shift position indicator.

CONSULT-III Reference Value

INFOID:0000000001851167

CVT
Item name

RANGE

Condition

Display value

Selector lever in N or P position.

NP

Selector lever in R position.

Selector lever in D position.

Selector lever in L position.

Diagnosis Procedure

INFOID:0000000001851168

1.CHECK INPUT SIGNALS

With CONSULT-III
Start engine.
Select MAIN SIGNALS in DATA MONITOR mode for TRANSMISSION with CONSULT-III and read
out the value of RANGE.
3. Check that the following three positions or indicators are same.
Actual position of the selector lever
RANGE on CONSULT-III screen
Shift position indicator in the combination meter
OK or NG
OK
>> INSPECTION END
NG
>> Check the following.
1.
2.

SHIFT POSITION INDICATOR SYMPTOM CHART

Items

Presumed location of trouble

Park/neutral position switch

Refer to CVT-60.
CVT main system (Fail-safe function actuated)
Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".

Actual position does not change.

Shift position indicator in the combination meter does not indicate

any position.
Actual position changes, but the shift position indicator in the combination meter does not change.

Perform the self-diagnosis for CVT and the combination meter.

Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)"
and DI-5.

Actual position differs from the shift position indicator in the combination meter.
Shift position indicator in the combination meter does not indicate
specific position only.

N
Check the combination meter.
Refer to DI-5.

Revision: July 2007

CVT-149

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS FOR SYMPTOMS

Wiring Diagram - CVT - NONDTC

INFOID:0000000001851169

BCWA0750E

Revision: July 2007

CVT-150

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
A

CVT

O
BCWA0751E

Revision: July 2007

CVT-151

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >

BCWA0752E

Revision: July 2007

CVT-152

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
A

CVT

O
AWDWA0008GB

TCM TERMINALS AND REFERENCE VALUES

Refer to CVT-44, "TCM Input/Output Signal Reference Value".

O/D OFF Indicator Lamp Does Not Come On

INFOID:0000000001851170

SYMPTOM:
Revision: July 2007

CVT-153

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
O/D OFF indicator lamp does not come on for about 2 seconds when turning ignition switch ON.

DIAGNOSTIC PROCEDURE

1.CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the U1000 CAN COMM CIRCUIT indicated in the results?
YES >> Check CAN communication line. Refer to CVT-54.
NO
>> GO TO 2.

2.CHECK TCM POWER SOURCE

1.
2.

Turn ignition switch ON.

Check voltage between TCM connector terminals and ground. Refer to CVT-122, "Wiring Diagram - CVT
- POWER".
Name

Connector

Power supply

F23

Terminal
46 - Ground
48 - Ground

Voltage (Approx.)
Battery voltage

OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.

3.DETECT MALFUNCTIONING ITEM

Check the following.
Harness for short or open between ignition switch and TCM connector terminal 46, 48
Refer to CVT-122, "Wiring Diagram - CVT - POWER".
10 A fuse (No.49, located in the IPDM E/R). Refer to CVT-122, "Wiring Diagram - CVT - POWER".
Ignition switch. Refer to PG-3.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.

4.CHECK TCM GROUND CIRCUIT

1.
2.
3.

Turn ignition switch OFF.

Disconnect TCM connector (A).
Check continuity between TCM connector (A) terminals and
ground. Refer to CVT-122, "Wiring Diagram - CVT - POWER".
Name

Connector

Ground

F23

Terminal
5 - Ground
42 - Ground

Continuity
Yes

OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.

SCIA8213E

5.DETECT MALFUNCTIONING ITEM

Check the following.
Harness and fuse for short or open between ignition switch and O/D OFF indicator lamp
Refer to PG-3.
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace damaged parts.

6.CHECK SYMPTOM
Revision: July 2007

CVT-154

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
Check again. Refer to CVT-39, "Check before Engine Is Started".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK COMBINATION METERS

Check combination meters. Refer to DI-5.

OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

CVT

Engine Cannot Be Started in "P" or "N" Position

INFOID:0000000001851171

SYMPTOM:
E

Engine cannot be started with selector lever in P or N position.

Engine can be started with selector lever in D, L or R position.

DIAGNOSTIC PROCEDURE

1.CHECK PNP SWITCH

Check continuity between PNP switch harness connector terminals. Refer to CVT-34, "Circuit Diagram".

G
Selector lever position
P, N
Other positions

Connector

Terminal

F26

6-7

Continuity
Yes

No

OK or NG
YES >> GO TO 3.
NO
>> GO TO 2.

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".
OK or NG
OK
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".
NG
>> Check PNP switch (Refer to test group 1.) again after adjusting PNP switch (Refer to CVT-174).
If OK, INSPECTION END
If NG, repair or replace PNP switch. Refer to CVT-178, "Park/Neutral Position (PNP) Switch".

3.CHECK STARTING SYSTEM

Check starting system. Refer to SC-8.

OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

In "P" Position, Vehicle Moves Forward or Backward When Pushed

INFOID:0000000001851172

SYMPTOM:
Vehicle moves when it is pushed forward or backward with selector lever in P position.

DIAGNOSTIC PROCEDURE

1.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".

OK or NG
OK
>> GO TO 2.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

2.CHECK SYMPTOM
Check again. Refer to CVT-39, "Check at Idle".
Revision: July 2007

CVT-155

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
OK or NG
OK
>> INSPECTION END
NG
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".

In "N" Position, Vehicle Moves

INFOID:0000000001851173

SYMPTOM:
Vehicle moves forward or backward when selecting N position.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate PNP switch circuit?
YES >> Check PNP switch circuit. Refer to CVT-60.
NO
>> GO TO 2.

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".
OK or NG
OK
>> GO TO 3.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK CVT FLUID LEVEL

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK SYMPTOM
Check again. Refer to CVT-39, "Check at Idle".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 5.

5.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Large Shock "N" "R" Position

INFOID:0000000001851174

SYMPTOM:
There is large shock when shifting from N to R position.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

2.CHECK ENGINE IDLE SPEED

Check the engine idle speed. Refer to EC-79, "Idle Speed and Ignition Timing Check".
OK or NG
Revision: July 2007

CVT-156

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
OK
>> GO TO 3.
NG
>> Repair.

3.CHECK CVT FLUID LEVEL

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

CVT

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.SYMPTOM CHECK

Check again. Refer to CVT-39, "Check at Idle".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Vehicle Does Not Creep Backward in "R" Position

INFOID:0000000001851175

SYMPTOM:

Vehicle does not creep backward when selecting R position.

DIAGNOSTIC PROCEDURE
K

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction detected by self-diagnosis
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".

OK or NG
OK
>> GO TO 3.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK CVT FLUID LEVEL

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".

OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
Revision: July 2007

CVT-157

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.CHECK STALL REVOLUTION

Check stall revolution. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 6.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

6.CHECK SYMPTOM
Check again. Refer to CVT-39, "Check at Idle".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Vehicle Does Not Creep Forward in "D" or "L" Position

INFOID:0000000001851176

SYMPTOM:
Vehicle does not creep forward when selecting D or L position.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".
OK or NG
OK
>> GO TO 3.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK CVT FLUID LEVEL

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.CHECK STALL REVOLUTION

Check stall revolution. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 6.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".
Revision: July 2007

CVT-158

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >

6.CHECK SYMPTOM

Check again. Refer to CVT-39, "Check at Idle".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Vehicle Speed Does Not Change in "L" Position

INFOID:0000000001851177

CVT

SYMPTOM:
Vehicle speed does not change in L position while the cruise test.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".

Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

2.CHECK CVT POSITION

I

Check CVT position. Refer to CVT-173, "Checking of CVT Position".

OK or NG
OK
>> GO TO 3.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK CVT FLUID LEVEL

K

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".

OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.CHECK STALL REVOLUTION

Check stall revolution. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 6.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

6.CHECK SYMPTOM
Check again. Refer to CVT-41, "Cruise Test".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

Revision: July 2007

CVT-159

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >

7.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer toCVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Vehicle Speed Does Not Change in overdrive-off mode

INFOID:0000000001851178

SYMPTOM:
Vehicle speed does not change in overdrive-off mode while the cruise test.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

2.CHECK OVERDRIVE CONTROL SWITCH

Check overdrive control switch. Refer to CVT-144.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.

3.CHECK CVT FLUID LEVEL

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.CHECK STALL REVOLUTION

Check stall revolution. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 6.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

6.CHECK SYMPTOM
Check again. Refer to CVT-41, "Cruise Test".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.
Revision: July 2007

CVT-160

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >

Vehicle Speed Does Not Change in "D" Position

INFOID:0000000001851179

SYMPTOM:
Vehicle speed does not change in D position while the cruise test.
B

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

CVT

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".
OK or NG
OK
>> GO TO 3.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK CVT FLUID LEVEL

Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.CHECK STALL REVOLUTION

Check stall revolution. Refer to CVT-35, "Inspections before Trouble Diagnosis".

OK or NG
OK
>> GO TO 6.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

6.CHECK SYMPTOM

Check again. Refer to CVT-41, "Cruise Test".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Cannot Be Changed to Manual Mode

INFOID:0000000001851180

SYMPTOM:
Does not change to manual mode when manual shift gate is used.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Revision: July 2007

CVT-161

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)" .
NO
>> GO TO 2.

2.CHECK MANUAL MODE SWITCH

Check the manual mode switch circuit. Refer to CVT-104 .
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.

3.SYMPTOM CHECK
Check again. Refer to CVT-41, "Cruise Test" .
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 4.

4.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value" .
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

CVT Does Not Shift in Manual Mode

INFOID:0000000001851181

SYMPTOM:
Speed does not change even if the selector lever is put in the manual shift gate position and the selector lever is operated to + side or to - side.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)" .
NO
>> GO TO 2.

2.CHECK MANUAL MODE SWITCH

Check the manual mode switch circuit. Refer to CVT-104 .
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.

3.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position"
OK or NG
OK
>> GO TO 4.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

4.CHECK CVT FLUID LEVEL

Revision: July 2007

CVT-162

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 5.
NG
>> Refill CVT fluid.

CVT
SAT638A

5.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before

Trouble Diagnosis" .
OK or NG
OK
>> GO TO 6.
NG
>> Check the malfunctioning item. Refer to CVT-35,
"Inspections before Trouble Diagnosis" .

G
SAT494G

6.CHECK SYMPTOM

Check again. Refer to CVT-41, "Cruise Test".

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.

7.CHECK TCM

1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer toCVT-187, "Removal and Installation (MR20DE)" or CVT189, "Removal and Installation (QR25DE)".
NG
>> Repair or replace damaged parts.

Vehicle Does Not Decelerate by Engine Brake

INFOID:0000000001851182

SYMPTOM:
Engine brake does not operate when releasing the accelerator pedal while the cruise test.

DIAGNOSTIC PROCEDURE

1.CHECK SELF-DIAGNOSTIC RESULTS

Perform self-diagnosis check. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-46, "CONSULT-III Function (TRANSMISSION)".
NO
>> GO TO 2.

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".
OK or NG
OK
>> GO TO 3.
NG
>> Adjust CVT position. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK CVT FLUID LEVEL

Revision: July 2007

CVT-163

2008 Sentra

TROUBLE DIAGNOSIS FOR SYMPTOMS

< SERVICE INFORMATION >
Check CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".
OK or NG
OK
>> GO TO 4.
NG
>> Refill CVT fluid.

4.CHECK LINE PRESSURE

Check line pressure at idle. Refer to CVT-35, "Inspections before Trouble Diagnosis".
OK or NG
OK
>> GO TO 5.
NG
>> Check the malfunctioning item. Refer to CVT-35, "Inspections before Trouble Diagnosis".

5.CHECK SYMPTOM
Check again. Refer to CVT-41, "Cruise Test".
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.

6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-44, "TCM Input/Output Signal Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the transaxle assembly. Refer to CVT-187, "Removal and Installation (MR20DE)".
NG
>> Repair or replace damaged parts.

Revision: July 2007

CVT-164

2008 Sentra

TRANSMISSION CONTROL MODULE

< SERVICE INFORMATION >

TRANSMISSION CONTROL MODULE

Removal and Installation

INFOID:0000000001851183

COMPONENTS

MR20DE
CVT

G
ALDIA0196GB

H
1.

TCM

2.

Bracket

REMOVAL
1.
2.
3.
4.

Disconnect the battery negative terminal.

Remove the fresh air intake tube (upper). Refer to EM-16.
Disconnect the TCM harness connector.
Remove the TCM (1).

INSTALLATION

Installation is in the reverse order of removal.

COMPONENTS

QR25DE
M

ALDIA0197GB

1.

TCM

Revision: July 2007

2.

Bracket

3.

CVT-165

Battery tray

2008 Sentra

TRANSMISSION CONTROL MODULE

< SERVICE INFORMATION >
REMOVAL
1. Disconnect the battery negative terminal.
2. Remove the air cleaner case. Refer to EM-16.
3. Disconnect the TCM harness connector.
4. Remove the TCM.

INSTALLATION
Installation is in the reverse order of removal.

Revision: July 2007

CVT-166

2008 Sentra

CVT SHIFT LOCK SYSTEM

< SERVICE INFORMATION >

CVT SHIFT LOCK SYSTEM

Description

INFOID:0000000001851184

The mechanical key interlock mechanism also operates as a shift lock:

B
With the ignition switch turned to ON, selector lever cannot be shifted from P position to any other position
unless brake pedal is depressed.
With the key removed, selector lever cannot be shifted from P position to any other position.
CVT
The key cannot be removed unless selector lever is placed in P position.
The shift lock and key interlock mechanisms are controlled by the ON-OFF operation of the shift lock solenoid and by the operation of the rotator and slider located inside key cylinder, respectively.
D

Shift Lock System Electrical Parts Location

INFOID:0000000001851185

L
WCIA0724E

1.

Key interlock cable

2.

Key cylinder

3.

Stop lamp switch

4.

Brake pedal

5.

Shift lock release button

6.

Key interlock cable

7.

Shift lock solenoid

8.

Park position switch

Revision: July 2007

CVT-167

2008 Sentra

CVT SHIFT LOCK SYSTEM

< SERVICE INFORMATION >

Wiring Diagram - CVT - SHIFT

INFOID:0000000001851186

AWDWA0009GB

Diagnosis Procedure

INFOID:0000000001851187

SYMPTOM 1:
Selector lever cannot be moved from P position with ignition switch in ON position and brake
pedal depressed.
Revision: July 2007

CVT-168

2008 Sentra

CVT SHIFT LOCK SYSTEM

< SERVICE INFORMATION >
Selector lever can be moved from P position with ignition key in ON position and brake pedal
released.
Selector lever can be moved from P position when ignition switch is removed from key cylinder.
SYMPTOM 2:
Ignition key cannot be removed when selector lever is set to P position.
Ignition key can be removed when selector lever is set to any position except P position.
Ignition switch (i-key) cannot be turned when selector lever is set to P position.
Ignition switch (i-key can be turned when selector lever is set to any position except P position.

1.CHECK KEY INTERLOCK CABLE

CVT

Check key interlock cable for damage.

OK or NG
OK
>> GO TO 2.
NG
>> Repair key interlock cable. Refer to CVT-175, "Removal and Installation".

2.CHECK CVT POSITION

Check CVT position. Refer to CVT-173, "Checking of CVT Position".

OK or NG
OK
>> GO TO 3.
NG
>> Adjust control cable. Refer to CVT-173, "Adjustment of CVT Position".

3.CHECK SHIFT LOCK SOLENOID AND PARK POSITION SWITCH

1.
2.
3.

Turn ignition switch ON. (Do not start engine.)

Selector lever is set in P position.
Check operation sound.
Condition

Brake pedal

Operation sound

When ignition switch is turned to ON position and selector lever is set in

P position.

Depressed

Yes

Released

No

OK or NG
OK
>> INSPECTION END
NG
>> GO TO 4.

4.CHECK POWER SOURCE

Check voltage between CVT device harness connector M38 terminal

3 and ground.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.

N
WCIA0720E

5.DETECT MALFUNCTIONING ITEM

O

Check the following. If any items are damaged, repair or replace damaged parts.
Harness for short or open between ignition switch and CVT device harness connector
10A fuse [No.12, located in the fuse block (J/B)]
Ignition switch, Refer to PG-3 .
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.

6.CHECK STOP LAMP SWITCH POWER SOURCE

Revision: July 2007

CVT-169

2008 Sentra

CVT SHIFT LOCK SYSTEM

< SERVICE INFORMATION >
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector M38.
3. Turn ignition switch ON.
4. Check voltage between stop lamp switch harness connector
E60 terminal 3 and ground.
3 - ground

: Battery voltage

OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
WCIA0728E

7.CHECK STOP LAMP SWITCH SUPPLY CIRCUIT

1.
2.
3.

Turn ignition switch OFF.

Disconnect CVT device harness connector E60.
Check continuity between stop lamp switch harness connector
E60 (B) terminal 3 and CVT device harness connector M38 (A)
terminal 4.
Continuity should exist.

OK or NG
OK
>> Replace shift lock solenoid assembly.
NG
>> Repair or replace harness as necessary.
WCIA0729E

8.CHECK GROUND CIRCUIT

1.
2.

Turn ignition switch OFF.

Check continuity between stop lamp switch harness connector
E60 terminal 4 and ground.
Continuity should exist.

OK or NG
OK
>> GO TO 9.
NG
>> Repair or replace harness as necessary.
WCIA0730E

9.CHECK STOP LAMP SWITCH

Check continuity between stop lamp switch harness connector terminals 3 and 4.
Condition

Continuity

When brake pedal is depressed

Yes

When brake pedal is released

No

Check stop lamp switch after adjusting brake pedal. Refer to

BR-5 .
OK or NG
OK
>> INSPECTION END.
NG
>> Replace stop lamp switch.

Revision: July 2007

CVT-170

SCIA2126E

2008 Sentra

SHIFT CONTROL SYSTEM

< SERVICE INFORMATION >

SHIFT CONTROL SYSTEM

Removal and Installation

INFOID:0000000001851188

CONTROL DEVICE COMPONENTS

CVT

WCIA0692E

1.

Selector lever knob

2.

Selector button and overdrive connector switch assembly

3.

4.

Knob cover

5.

Shift lock solenoid and park position 6.

switch assembly

Lock pin

Control device assembly

CONTROL CABLE COMPONENTS

Revision: July 2007

CVT-171

2008 Sentra

SHIFT CONTROL SYSTEM

< SERVICE INFORMATION >

WCIA0689E

1.

Selector lever knob

2.

Control device assembly

3.

Cable socket

4.

Control cable

5.

Cable bracket

6.

Bracket

7.

Lock plate

8.

Manual lever

9.

Transaxle assembly

A.

Floor

REMOVAL
CAUTION:
Make sure that parking brake is applied before removal and installation.
1. Place the selector lever in the P position.
2. Remove the IP center assembly. Refer to IP-10.
3. Disconnect the CVT device harness connector.
4. Remove the key interlock cable from the control device assembly. Refer to CVT-175, "Removal and Installation".
5. Remove the control cable from the control device assembly.
6. Remove the nuts and the control device assembly.

INSTALLATION
Installation is in the reverse order of removal.
When installing the control cable (3) to the control device assembly
(2), make sure that the control cable socket is fully pressed into the
control device assembly (2), and the control cable end (1) is fully
pressed in with the ribbed surface (A) facing towards the front of
the vehicle.
: Vehicle front
After installation is completed, adjust and check the CVT position.
Refer to CVT-173, "Adjustment of CVT Position" and CVT-173,
"Checking of CVT Position".
WCIA0690E

Selector Lever Knob Removal and Installation

INFOID:0000000001851189

REMOVAL
CAUTION:
Make sure that parking brake is applied before removal and installation.

Revision: July 2007

CVT-172

2008 Sentra

SHIFT CONTROL SYSTEM

< SERVICE INFORMATION >
1. Set selector lever knob (1) in N position.
2. Slide knob cover (2) downward.
3. Pull out lock pin (3) from selector lever knob (1).
4. Remove selector lever knob (1) and knob cover (2) as a set from
selector lever.
CAUTION:
Do not push selector button.

CVT
LCIA0410E

INSTALLATION
1.
2.
3.
4.

Insert lock pin (3) to selector lever knob (1).

Install knob cover (2) to selector lever knob (1).
Set selector lever in N position.
Install selector lever knob over selector lever until a click is felt.
CAUTION:
Do not tilt selector lever knob when installing. Install it
straight, and do not tap or apply any shock to install it.
Do not push selector button.

G
LCIA0411E

Adjustment of CVT Position

INFOID:0000000001851190

CAUTION:
Make sure that parking brake is applied before adjustment.
1. Loosen the control cable nut and place the manual lever in P position.
2. Place selector lever in P position.
3. Temporarily tighten the control cable nut.
NOTE:
Do not move the manual lever. Make sure the manual lever stays in the P position.
4. Tighten the control cable nut.
Control cable nut:

5.

3.
4.

Refer to CVT-171, "Removal and Installation".

L

CAUTION:
Secure the manual lever when tightening nut.
Check the operation of the CVT. Refer to CVT-173, "Checking of CVT Position".

Checking of CVT Position

1.
2.

INFOID:0000000001851191

Place selector lever in P position, and turn ignition switch ON. (Do not start engine.)
Make sure selector lever can be shifted to other than P position when brake pedal is depressed. Also
make sure selector lever can be shifted from P position only when brake pedal is depressed.
Move the selector lever and check for excessive effort, sticking, noise or rattle.
Confirm the selector lever stops at each position with the feel of engagement when it is moved through all
the positions. Check that the actual position of the selector lever matches the position shown by the shift
position indicator and the manual lever on the transaxle.

Revision: July 2007

CVT-173

2008 Sentra

SHIFT CONTROL SYSTEM

< SERVICE INFORMATION >
5. The method of operating the selector lever to individual positions correctly should be as shown.
(A): Press selector button to operate selector lever, while
depressing the brake pedal.
(B): Press selector button to operate selector lever.
(C): Selector lever can be operated without pressing selector
button.
6. Confirm the back-up lamps illuminate only when selector lever is
placed in the R position. Confirm the back-up lamps do not illuminate when the selector lever is pushed toward the R position
side with the gear position remained in the P or N position.
7. Confirm the engine can only be started with the selector lever in
the P and N positions.
8. Make sure transaxle is locked completely in P position.

Adjustment of PNP switch

INFOID:0000000001851192

1.
2.

Move selector lever to N position.

Remove control cable from manual lever.

3.

Loosen PNP switch bolts (A). Insert a pin (4 mm) into the
adjusting holes (B) on both PNP switch and manual lever for
adjusting the position.
Tighten PNP switch bolts (A).

4.

PNP switch bolts

5.

WCIA0620E

: 5.9 Nm (0.60 kg-m, 52 in-lb)

Connect control cable on manual lever (B). Refer toCVT-173,

"Adjustment of CVT Position".
SCIA6635J

Revision: July 2007

CVT-174

2008 Sentra

KEY INTERLOCK CABLE

< SERVICE INFORMATION >

KEY INTERLOCK CABLE

Removal and Installation

INFOID:0000000001851193

COMPONENTS

CVT

WCIA0691E

1.

Key interlock cable

2.

Key cylinder

3.

Control device assembly

A.

Lock plate

B.

Holder

C.

Clip

D.

Slider

E.

Key interlock rod

F.

Adjust holder

G.

Casing cap

REMOVAL

Refer to the figure for key interlock cable removal procedure.

CAUTION:
Make sure that parking brake is applied before removal/installation.
1. Place the selector lever in the N position.
2. Remove the selector lever knob. Refer to CVT-172, "Selector Lever Knob Removal and Installation".
3. Remove the IP center assembly. Refer to IP-10.

Revision: July 2007

CVT-175

2008 Sentra

KEY INTERLOCK CABLE

< SERVICE INFORMATION >
4. Slide the slider (A) toward the casing cap (B) while pressing tabs
(C) on the slider to separate the slider (A) from the adjust holder
(D).
5. Remove the casing cap (B) from the cable bracket on the control
device assembly.
6. Remove the key interlock cable from the key interlock rod (E).

WCIA0695E

7.
8.
9.

Remove steering column cover (upper and lower) and instrument lower finisher. Refer to IP-10.
Pull out the lock plate (A) from the holder (B).
Remove the key interlock cable (1) from the key cylinder (2).

SCIA6976E

10. Remove the clip and then remove the key interlock cable from the vehicle.

INSTALLATION
CAUTION:
Install key interlock cable in such a way that it will not be damaged by sharp bends, twists or interference with adjacent parts.
After installing key interlock cable to control device assembly, make sure that casing cap and
bracket are firmly secured in their positions.
1. Place the selector lever in the P position.
2. Turn ignition switch to ACC or ON position.
3. Set the key interlock cable (1) to the key cylinder (2).
4. Install the lock plate (A) to the holder (B).
5. Turn ignition switch to LOCK position.

SCIA6976E

6.
7.

Temporarily install the adjust holder (A) to the key interlock rod
(B).
Install the casing cap (C) to the cable bracket (D) on the control
device assembly.
CAUTION:
Do not bend or twist key interlock cable excessively when
installing.
After installing key interlock cable to cable bracket (D) on
control device assembly, make sure casing caps (C) is
firmly secured in cable bracket (D) on control device
assembly.
If casing cap (C) is loose [less than 39.2 N (4.0 kg, 8.8 lb)
removing force], replace key interlock cable.

Revision: July 2007

CVT-176

SCIA6188E

2008 Sentra

KEY INTERLOCK CABLE

< SERVICE INFORMATION >
8. Install shift knob in "P" position.
9. Pull the adjust holder (C) all the way to the left on the key interlock rod (B). Move the slider (A) toward the key interlock rod (B)
and lock it.
CAUTION:
Do not press tabs when holding slider (A).
Do not apply any force to key interlock rod (B) when sliding slider (A).

CVT

WCIA0696E

10. Secure the key interlock cable with the clip.

11. Installation of the remaining components is in the reverse order of removal.
12. Check shift lock system. Refer to CVT-167, "Description".

Revision: July 2007

CVT-177

2008 Sentra

ON-VEHICLE SERVICE
< SERVICE INFORMATION >

ON-VEHICLE SERVICE
Oil Pan

INFOID:0000000001851194

COMPONENTS

WCIA0678E

1.

CVT assembly

2.

Oil pan gasket

3.

Oil pan

4.

Magnet

5.

Drain plug gasket

6.

Drain plug

CAUTION:
Check for foreign materials in the oil pan to help determine the cause of any malfunction. If the CVT
fluid is very dark, smells burned, or contains foreign particles, frictional material (clutches) may
need replacement. A tacky film that will not wipe clean indicates varnish build up. Varnish can cause
valves to stick and can inhibit pump pressure.
Completely remove all moisture, oil, old gasket and any foreign material from the gasket mounting
surface of the CVT case and oil pan.
Do not reuse oil pan gasket and oil pan bolts.
After installation is complete, fill CVT will recommended CVT fluid and check for CVT fluid leakage
and CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".

Park/Neutral Position (PNP) Switch

INFOID:0000000001851195

COMPONENTS

Revision: July 2007

CVT-178

2008 Sentra

ON-VEHICLE SERVICE
< SERVICE INFORMATION >
A

CVT

H
WCIA0679E

1.

PNP switch

2.

CVT assembly

NOTE:
Align PNP switch position when installing.
After installation of PNP switch, check the continuity of PNP switch. Refer to CVT-174, "Adjustment of PNP
switch".
After installation is complete, adjust and check CVT position. Refer to CVT-173, "Adjustment of CVT Position", CVT-173, "Checking of CVT Position".

Primary Speed Sensor

INFOID:0000000001851196

COMPONENTS

WCIA0680E

Revision: July 2007

CVT-179

2008 Sentra

ON-VEHICLE SERVICE
< SERVICE INFORMATION >
1.

CVT assembly

2.

O-ring

3.

Primary speed sensor

: Apply CVT Fluid. Refer to MA-13, "MR20DE".

CAUTION:
Do not reuse O-ring.
Apply CVT fluid to O-ring.
After installation is complete, check for CVT fluid leakage and CVT fluid level. Refer to CVT-14,
"Checking CVT Fluid".

Secondary Speed Sensor

INFOID:0000000001851197

COMPONENTS

WCIA0681E

1.

CVT assembly

4.

Secondary speed sensor

2.

Shim

3.

O-ring

: Apply CVT Fluid. Refer to MA-13, "MR20DE".

CAUTION:
Do not reuse O-ring.
Apply CVT fluid to O-ring.
Insert the shim.
After installation is complete, check for CVT fluid leakage and CVT fluid level. Refer to CVT-14,
"Checking CVT Fluid".

Differential Side Oil Seal

INFOID:0000000001851198

COMPONENTS

Revision: July 2007

CVT-180

2008 Sentra

ON-VEHICLE SERVICE
< SERVICE INFORMATION >
A

CVT

WCIA0697E

1.

CVT assembly

2.

Differential oil seal

:Apply CVT Fluid. Refer to MA-13, "MR20DE".

REMOVAL
1.
2.

Remove front drive shaft from CVT assembly. Refer to FAX-8.

Remove differential side oil seal using suitable tool.
CAUTION:
Do not scratch CVT case or converter housing.

K
SCIA2412E

INSTALLATION
1.

Drive the new differential side oil seal in until it is flush using tool.
Tool number

2.
3.

: KV38100300 (

)
M

CAUTION:
Do not reuse differential side oil seals.
Apply CVT fluid to the new differential side oil seals.
Install drive shaft assembly. Refer to FAX-8.
Check for CVT fluid leakage and CVT fluid level. Refer to CVT-14, "Checking CVT Fluid".

Oil Pump Fitting Bolt

N
INFOID:0000000001851199

NOTE:
Replace the oil pump fitting bolt and the O-ring if oil leaks or exudes from the oil pump fitting bolt.

COMPONENTS

Revision: July 2007

CVT-181

2008 Sentra

ON-VEHICLE SERVICE
< SERVICE INFORMATION >

WCIA0682E

1.

Oil pump fitting bolt

2.

O-ring

3.

CVT assembly

: Apply CVT Fluid. Refer to MA-13, "MR20DE".

CAUTION:
Do not reuse O-ring.
Apply CVT fluid to O-ring.
After installation is complete, check for CVT fluid leakage and CVT fluid level. Refer to CVT-14,
"Checking CVT Fluid".

Revision: July 2007

CVT-182

2008 Sentra

AIR BREATHER HOSE

< SERVICE INFORMATION >

AIR BREATHER HOSE

Removal and Installation (MR20DE)

INFOID:0000000001851200

CVT

I
WCIA0675E

1.

Air breather hose

2.

Clip

3.

4.

CVT assembly

5.

Air breather tube

Resonator

CAUTION:
Make sure air breather hose not collapsed or blocked due to folding or bending when installed.
NOTE:
Install the air breather hose (3) to the air breather tube (4) so that
the paint mark (A) faces upward. Also make sure the air breather
hose end is pushed up to the tube bend position.
When installing air breather hose (3) to the resonator (1) make
sure to fully insert the clip (2).

N
WCIA0676E

Revision: July 2007

CVT-183

2008 Sentra

AIR BREATHER HOSE

< SERVICE INFORMATION >

Removal and Installation (QR25DE)

INFOID:0000000001851201

WCIA0733E

1.

Air cleaner case

2.

Clip

3.

4.

CVT assembly

5.

Air breather tube

Air breather hose

CAUTION:
Make sure air breather hose not collapsed or blocked due to folding or bending when installed.
NOTE:
Install the air breather hose to the air breather tube so that the paint mark faces upward. Also make sure the
air breather hose end is pushed up to the tube bend position.
When installing air breather hose to the air cleaner case make sure to fully insert the clip.

Revision: July 2007

CVT-184

2008 Sentra

CVT FLUID COOLER SYSTEM

< SERVICE INFORMATION >

CVT FLUID COOLER SYSTEM

CVT Fluid Cooler Removal and Installation(MR20DE)

INFOID:0000000001851202

COMPONENTS

CVT

SCIA7676J

1.

Water pump

4.

Water thermostat tube

7.

CVT water hose

2.

Hose clamp

3.

CVT water hose

5.

CVT fluid cooler

6.

CVT assembly

8.

Engine coolant outlet

CVT Fluid Cooler Removal and Installation (QR25DE)

L
INFOID:0000000001851203

COMPONENTS
N

Revision: July 2007

CVT-185

2008 Sentra

CVT FLUID COOLER SYSTEM

< SERVICE INFORMATION >

WCIA0732E

1.

CVT assembly

2.

Hose clamp

3.

CVT water hose

4.

Water tube

5.

Water hose

6.

CVT fluid cooler assembly

7.

CVT fluid cooler

8.

CVT water hose

A.

To engine coolant outlet

B.

To heater pipe

NOTE:
Install and torque the CVT cooler assembly bolts to the specified
torque in the order shown.

LCIA0417E

Revision: July 2007

CVT-186

2008 Sentra

TRANSAXLE ASSEMBLY
< SERVICE INFORMATION >

TRANSAXLE ASSEMBLY

Removal and Installation (MR20DE)

INFOID:0000000001851204

COMPONENTS

CVT

WCIA0674E

1.

CVT fluid level gauge

2.

CVT fluid charging pipe

3.

O-ring

4.

Hose clamp

5.

CVT water hose

6.

Water thermostat tube

7.

Water hose

8.

Transaxle assembly

9.

Air breather hose

10.

CVT water hose

A.

To engine coolant outlet

B.

To water pump

C.

Refer to "INSTALLATION".

REMOVAL
1.
2.

3.

Remove the engine and transaxle as an assembly. Refer to EM-99, "Removal and Installation".
Disconnect the electrical connectors from the following:
Secondary speed sensor (1)
Primary speed sensor (2)
CVT unit connector (3)
PNP switch (4)
Remove the harness from the CVT.

WCIA0673E

Revision: July 2007

CVT-187

2008 Sentra

TRANSAXLE ASSEMBLY
< SERVICE INFORMATION >
4. Remove the four drive plate to torque converter nuts.
NOTE:
Rotate the crankshaft clockwise viewed from front of engine for
access to drive plate to torque converter nuts.

WCIA0616E

5.

6.
7.
8.

Put matching marks on the drive plate and torque converter alignment stud.
CAUTION:
For matching marks, use paint. Never damage the drive plate or torque converter.
Remove the CVT to engine and engine to CVT bolts.
Separate the CVT from the engine.
If necessary, remove the following from the CVT:
Primary speed sensor
Secondary speed sensor
PNP switch
CVT fluid charging pipe
Engine mounting bracket (LH)
Water tube and hoses
Air breather hose
Any necessary brackets

INSTALLATION
Installation is in the revers order of removal.
CAUTION:
When replacing an engine or transmission you must make sure any dowels are installed correctly
during re-assembly.
Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of drive
train components.
Do not reuse O-rings.
When turning crankshaft, turn it clockwise as viewed from the front of the engine.
When tightening the nuts for the torque converter while securing the crankshaft pulley bolt, be sure
to confirm the tightening torque of the crankshaft pulley bolt. Refer to EM-37.
After converter is installed to drive plate, rotate crankshaft several turns to check that CVT rotates
freely without binding.
When installing the torque converter to the CVT measure distance A.
Distance A:

14.4 mm (0.567 in)

WCIA0617E

When installing the CVT to the engine, align the matching mark on the drive plate with the matching
mark on the torque converter alignment stud.

Revision: July 2007

CVT-188

2008 Sentra

TRANSAXLE ASSEMBLY
< SERVICE INFORMATION >
When installing CVT to the engine, attach the bolts in accordance with the following standard.
Bolt No.
Number of bolts
Bolt length
A mm (in)
Tightening torque
Nm (kg-m, ft-lb)

1 (CVT to engine)

2 (Engine to CVT)

55 (2.17)

50 (1.97)

CVT
62 (6.3, 46)
WCIA0619E

When installing the drive plate to torque converter nuts,

tighten them temporarily. Then tighten the nuts to the specified torque.
Converter nuts

: 51 Nm (5.2 kg-m, 38 ft-lb)

F

G
WCIA0616E

After completing installation, check for fluid leakage, fluid level, and the positions of CVT. Refer to
CVT-14, "Checking CVT Fluid", CVT-173, "Adjustment of CVT Position", CVT-173, "Checking of CVT
Position".
When replacing the CVT assembly, erase EEP ROM in TCM. Refer toCVT-8, "Service After Replacing
TCM and Transaxle Assembly".

Removal and Installation (QR25DE)

INFOID:0000000001851205

COMPONENTS
K

Revision: July 2007

CVT-189

2008 Sentra

TRANSAXLE ASSEMBLY
< SERVICE INFORMATION >

WCIA0731E

1.

CVT fluid level gauge

2.

CVT fluid charging pipe

3.

O-ring

4.

Hose clamp

5.

CVT water hose

6.

Water tube

7.

Water hose

8.

Transaxle assembly

9.

Air breather hose

10.

CVT water hose

A.

To engine coolant outlet

B.

To heater pipe

C.

Refer to "INSTALLATION".

REMOVAL
1.
2.

3.

Remove the engine and transaxle as an assembly. Refer to EM-177, "Removal and Installation".
Disconnect the electrical connectors from the following:
Secondary speed sensor (1)
Primary speed sensor (2)
CVT unit connector (3)
PNP switch (4)
Remove the harness from the CVT.

WCIA0673E

4.

5.

6.

Remove the four drive plate to torque converter nuts.

NOTE:
Rotate the crankshaft clockwise viewed from front of engine for access to drive plate to torque converter
nuts.
Put matching marks on the drive plate and torque converter alignment stud.
CAUTION:
For matching marks, use paint. Never damage the drive plate or torque converter.
Remove the CVT to engine and engine to CVT bolts.

Revision: July 2007

CVT-190

2008 Sentra

TRANSAXLE ASSEMBLY
< SERVICE INFORMATION >
7. Separate the CVT from the engine.
8. If necessary, remove the following from the CVT:
Primary speed sensor
Secondary speed sensor
PNP switch
CVT fluid charging pipe
Engine mounting bracket (LH)
Water tube and hoses
Air breather hose
Any necessary brackets

CVT

INSTALLATION
Installation is in the revers order of removal.
CAUTION:
When replacing an engine or transmission you must make sure any dowels are installed correctly
during re-assembly.
Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of drive
train components.
Do not reuse O-rings.
When turning crankshaft, turn it clockwise as viewed from the front of the engine.
When tightening the nuts for the torque converter while securing the crankshaft pulley bolt, be sure
to confirm the tightening torque of the crankshaft pulley bolt. Refer to EM-156.
After converter is installed to drive plate, rotate crankshaft several turns to check that CVT rotates
freely without binding.
When installing the torque converter to the CVT measure distance A.
Distance A:

14.4 mm (0.567 in)

I

J
WCIA0617E

When installing the CVT to the engine, align the matching mark on the drive plate with the matching
mark on the torque converter alignment stud.
When installing CVT to the engine, attach the bolts in accordance with the following standard.

Bolt No.
Number of bolts
Bolt length
A mm (in)
Tightening torque
Nm (kg-m, ft-lb)

1 (CVT
to engine)

2 (CVT
to engine)

3 (Engine to
CVT)

4 (Engine to
CVT)

5 (Engine to
CVT)

6 (Engine to
CVT)

45
(1.77)

45
(1.77)

45
(1.77)

35
(1.38)

45
(1.77)

45
(1.77)

35
(3.6, 26)

75
(7.6, 55)

42.7
(4.4, 31)

42.7
(4.4, 31)

62
(6.3, 46)

62
(6.3, 46)

WCIA0727E

When installing the drive plate to torque converter nuts, tighten them temporarily. Then tighten the
nuts to the specified torque.
Converter nuts

: 51 Nm (5.2 kg-m, 38 ft-lb)

After completing installation, check for fluid leakage, fluid level, and the positions of CVT. Refer to
CVT-14, "Checking CVT Fluid", CVT-173, "Adjustment of CVT Position", CVT-173, "Checking of CVT
Position".
When replacing the CVT assembly, erase EEP ROM in TCM. Refer toCVT-8, "Service After Replacing
TCM and Transaxle Assembly".
Revision: July 2007

CVT-191

2008 Sentra

REPAIR FOR COMPONENT PARTS

< SERVICE INFORMATION >

REPAIR FOR COMPONENT PARTS

Torque Converter and Converter Housing Oil Seal

INFOID:0000000001851206

COMPONENTS

WCIA0683E

1.

Transaxle assembly

2.

Converter housing oil seal

3.

Torque converter

: Apply CVT Fluid NS-2.

Disassembly
1. Remove torque converter.
2. Remove the converter housing oil seal using suitable tool.
CAUTION:
Do not scratch converter housing.
Assembly

1.

Drive the converter housing oil seal (1) in evenly using suitable
tool as shown.
CVT (2)
CAUTION:
Do not reuse converter housing oil seal.
Apply CVT fluid to converter housing oil seal.

WCIA0684E

Revision: July 2007

CVT-192

2008 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)

< SERVICE INFORMATION >

SERVICE DATA AND SPECIFICATIONS (SDS)

General Specification

INFOID:0000000001851207

B
Applied model

MR20DE engine

CVT model

QR25DE engine
RE0F10A

CVT assembly

Model code number

Transmission gear ratio

1XF04

D range

2.349 - 0.394

Reverse

1.750

Final drive

5.407

Recommended fluid

CVT

1XF5B

NISSAN CVT Fluid NS-2*1

Fluid capacity

Liter (US qt., Imp qt)

8.3 (8-3/4, 7-1/4)

8.5 (9, 7 1/2)

CAUTION:
Use only Genuine NISSAN CVT Fluid NS-2. Do not mix with other fluid.
Using CVT fluid other than Genuine NISSAN CVT Fluid NS-2 will deteriorate in driveability and CVT durability, and may damage the CVT, which is not covered by the NISSAN new vehicle limited warranty.

*1: Refer to MA-13, "MR20DE".

Vehicle Speed When Shifting Gears

INFOID:0000000001851208

Numerical value data are reference values.

H
Engine type

Throttle position

Shift pattern

Engine speed (rpm)

At 40 km/h (25 MPH)

At 60 km/h (37 MPH)

D position
Full

Overdrive-off mode

3,400 - 4,200

4,300 - 5,100

D position

1,400 - 2,200

1,600 - 2,400

Overdrive-off mode

2,200 - 3,000

2,800 - 3,600

L position

3,600 - 4,400

4,100 - 4,900

3,300 - 4,200

4,300 - 5,200

L position

MR20DE
1/4

D position
Full

Overdrive-off mode

L position

QR25DE
1/4

D position

1,300 - 3,100

1,400 - 3,400

Overdrive-off mode

2,200 - 3,000

2,800 - 3,600

L position

3,200 - 4,100

4,100 - 4,900

CAUTION:

Lock-up clutch is engaged when vehicle speed is approximately 18 km/h (11 MPH) to 90 km/h (56 MPH).

Stall Speed

INFOID:0000000001851209

Revision: July 2007

Engine

Stall speed

MR20DE

2,500 - 3,000 rpm

QR25DE

2,050 - 3,550 rpm

CVT-193

2008 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)

< SERVICE INFORMATION >

Line Pressure

INFOID:0000000001851210

Line pressure kPa (kg/cm2, psi)

Engine speed

R, D, L positions
At idle

750 (7.65, 108.8)

At stall

5,700 (58.14, 826.5)*

*: Reference values

Solenoid Valves

INFOID:0000000001851211

Name

Resistance (Approx.)

Terminal

Pressure control solenoid valve B (secondary

pressure solenoid valve)

3
3.0 - 7.0

Pressure control solenoid valve A (line pressure

solenoid valve)

Torque converter clutch solenoid valve

12
17.0 - 38.0

Lock-up select solenoid valve

13

CVT Fluid Temperature Sensor

Name
ATF TEMP SEN

INFOID:0000000001851212

Condition

CONSULT-III DATA MONITOR (Approx.)

Resistance (Approx.)

20C (68F)

2.0 V

6.5 k

80C (176F)

1.0 V

0.9 k

Primary Speed Sensor

INFOID:0000000001851213

Name
Primary speed sensor

Condition

Data (Approx.)

When driving [L position, 20 km/h (12 MPH)].

890 Hz

Secondary Speed Sensor

INFOID:0000000001851214

Name
Secondary speed sensor

Condition

Data (Approx.)

When driving [D position, 20 km/h (12 MPH)].

460 Hz

Removal and Installation

INFOID:0000000001851215

Distance between end of converter housing and torque converter

Revision: July 2007

CVT-194

14.4 mm (0.567 in)

2008 Sentra