2001 F-150 Workshop Manual Page 1 of 45

SECTION 413-01A: Instrument Cluster — Conventional 2001 F-150 Workshop Manual

DIAGNOSIS AND TESTING Procedure revision date: 12/16/2003

Instrument Cluster

Refer to Wiring Diagrams Cell 62, Instrument Cluster for schematic and connector information.

Special Tool(s)
Instrument Gauge System Tester
014-R1063 or equivalent

73III Automotive Meter

105-R0057 or equivalent

Worldwide Diagnostic System (WDS)

418-F224,

New Generation STAR (NGS) Tester

418-F052, or equivalent diagnostic tool

Principles of Operation

Speedometer Gauge

The instrument cluster receives the vehicle speed signal from the powertrain control module (PCM) over the SCP network and displays it on the speedometer gauge. If the instrument
cluster receives no vehicle speed signal after one second, the speedometer defaults to 0.0 km/h (0.0 mph).

Fuel Gauge

The instrument cluster receives the fuel level information directly from the fuel sender. When the instrument cluster fails to receive the fuel level signal for more than 33 seconds, then the
fuel level gauge will move below E (empty). If the fuel level signal then operates correctly for more than 33 seconds, the fuel gauge will return to the correct position.

Fuel fills of less than 22.7 liters (6 gallons) require at least 5-20 minutes to update the fuel gauge indication.

Engine Coolant Temperature Gauge

Engine coolant temperature information is received by the instrument cluster from the PCM over the SCP network. Temperatures over 121°C (275°F) will display hot (H). If the engine
coolant temperature data is missing or invalid for five seconds, the instrument cluster will move the engine coolant temperature gauge below the cold (C) position.

Boost Pressure Gauge (Lightning only)

The boost pressure gauge on the instrument cluster receives the boost pressure status directly from the intake manifold. The boost pressure gauge will display three conditions: boost
pressure with acceleration, vacuum pressure at idle, or 0 pressure at consistent engine load and rpm.

Odometer

The instrument cluster receives odometer rolling count status from the PCM and stores the mileage in non-volatile memory (NVM). When the instrument cluster fails to receive the odometer
rolling count status for more than two seconds, the odometer display will show dashes.

Low Oil Pressure Indicator

The low oil pressure indicator on the instrument cluster receives the oil pressure status directly from the oil pressure switch. The two-position oil pressure gauge will display either normal or
no oil pressure. The low oil pressure indicator will prove out when the ignition switch is placed in the START position and then in the RUN position.

Brake Warning Indicator

The BRAKE indicator will prove out when the ignition switch is placed in the START and then in the RUN position. The BRAKE indicator will also be illuminated when the instrument cluster
receives a ground signal from the parking brake switch or the brake fluid level switch.

Safety Belt Indicator

The seat belt switch is hardwired to the generic electronic module (GEM) or central timer module (CTM). The safety belt warning indicator will be illuminated when the GEM/CTM sends a
ground signal to the instrument cluster. The safety belt indicator will prove out when the ignition switch is placed in the START position and then in the RUN position.

Yellow ABS Warning Indicator

The ABS indicator will be illuminated when the anti-lock brake control module sends an open signal to the instrument cluster. The prove out of the ABS indicator is controlled by the anti-lock
brake control module.

Service Engine Soon Indicator

After the engine is started, the SERVICE ENGINE SOON indicator will prove out for a duration of three seconds. If the instrument cluster does not receive a message from the PCM within
five seconds, the instrument cluster will send two messages to the PCM and attempt to reestablish communication. If the instrument cluster is unable to establish communication, the
instrument cluster will illuminate the SERVICE ENGINE SOON indicator and log a diagnostic trouble code (DTC).

High Beam Indicator

The high beam indicator will illuminate when the multifunction switch is in the high beam position and sends a battery signal to the instrument cluster.

Right and Left Turn Indicator

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The right and left turn indicators will illuminate when the multifunction switch is in either turn signal position or hazard lamps position and sends a battery signal to the instrument cluster.

Air Bag Indicator

The air bag indicator will be illuminated when the restraint control module (RCM) sends a ground signal to the instrument cluster. The prove out of the air bag indicator is controlled by the
RCM.

Anti-Theft Indicator

The THEFT indicator provides passive anti-theft system (PATS) prove out. The THEFT indicator will prove out for three seconds following the ignition switch cycle and will flash following the
ignition OFF to indicate that PATS is active.

Charging System Indicator

The charging system indicator will be illuminated when the generator sends a ground signal to the instrument cluster.

Speed Control

The speed control (CRUISE) indicator is controlled by the speed control servo and hardwired to the instrument cluster.

4X4 High Indicator

The 4X4 high indicator will be illuminated when the vehicle is in 4X4 high mode and the GEM sends a ground signal to the instrument cluster. The 4X4 high indicator will prove out when the
ignition switch is placed in the START position and then in the RUN position.

Low Range Indicator

The LOW RANGE indicator will be illuminated when the vehicle is in 4X4 low and the PCM sends a message to the instrument cluster via the SCP network. The low range indicator will
prove out when the ignition switch is placed in the START position and then in the RUN position.

Door Ajar Indicator

The door ajar indicator will prove out when the ignition switch is placed in the START position and then in the RUN position. The door ajar indicator will be illuminated when the CTM/GEM
provides a ground signal to the instrument cluster.

Low Fuel Indicator

The low fuel indicator will prove out when the ignition switch is placed in the START position and then in the RUN position. The low fuel indicator will illuminate when the fuel level gets low.
The instrument cluster receives the fuel level information directly from the fuel sender.

Inspection and Verification

1. Verify the customer concern by operating the instrument cluster to duplicate the condition. Observe the indicators, warning displays, and gauges to determine if they are operating
correctly with the ignition switch:

in RUN with the engine off.

in START before the ignition switch is released.

in RUN with the engine running.

2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

Mechanical Electrical

Low washer fluid level
Central junction box (CJB) fuse(s):

Fuel tank  2 (5A)

Low engine coolant level  6 (5A)

Loose or damaged accessory drive belt  8 (5A)

Low engine oil level  15 (5A)

Parking brake position switch  20 (5A)

Brake fluid level  30 (30A)

Battery junction box (BJB) fuse 103 (50A)

Circuitry

3. If the inspection reveals obvious concern(s), repair as required.

4. If the cause of the fault is not visually evident, proceed to the diagnostic tool diagnostics.

Diagnostic Tool Diagnostics

1. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from
the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

Check that the program card is correctly installed.

Check the connections to the vehicle.

Check the ignition switch position.

2. If the diagnostic tool still does not power up, refer to the diagnostic tool manual.

3. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:

SCP or ISO = all electronic control units no response/not equipped, refer to Section 418-00.

No response/not equipped for hybrid electronic cluster (HEC), GO to Pinpoint Test A.

No response/not equipped for generic electronic module/central timer module (GEM/CTM), GO to Pinpoint Test B.

System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the HEC, and
GEM/CTM.

4. If the DTCs retrieved are related to the concern, go to the Hybrid Electronic Cluster (HEC) Diagnostic Trouble Code (DTC) Index, or the Generic Electronic Module (GEM)/Central
Timer Module (CTM) Diagnostic Trouble Code (DTC) Index to continue diagnostics.

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5. If no DTCs related to the concern are retrieved, proceed to the HEC Dealer Test Mode to continue diagnostics.

Parameter Reset and Key Programming

NOTE: The instrument cluster parameters must be reset upon installation of a new instrument cluster.

NOTE: Both passive anti-theft system (PATS) keys are needed to carry out this procedure.

To reset the instrument cluster parameters and program the keys, complete the following procedure:

1. Connect the diagnostic tool.

2. Select the instrument cluster.

3. Select ENTER SECURITY ACCESS. Wait 10 minutes for security access to be granted.

4. Select PARAMETER RESET.

5. Disconnect the diagnostic tool.

6. Place the first PATS key in the OFF position.

7. Place the key in the ON position.

8. Remove the key.

9. Place the second PATS key in the ON position.

10. Place the key in the OFF position (the programming sequence is complete).

NOTE: If the vehicle fails to start following completion of the parameter reset and key programming sequence, clear the keep alive memory (KAM) by disconnecting the battery for five
minutes. For additional information about the battery disconnect procedure, refer to Section 414-00.

Hybrid Electronic Cluster (HEC) Dealer Test Mode

To enter the HEC Dealer Test Mode, depress and hold the instrument cluster SELECT/RESET button and then turn the ignition switch to the RUN position. Continue pressing the
SELECT/RESET button (five seconds) until tESt is displayed in the odometer. The SELECT/RESET button must be released within three seconds of the odometer displaying tESt to begin
the dealer test mode. Depress the SELECT/RESET button to advance through the following steps until dtc is displayed. Depressing the SELECT/RESET button will display any continuous
DTCs stored before proceeding to the next step.

Odometer
Display Description
GAGE Activates gauge sweep of all gauges, then displays present gauge values. Also carries out the checksum tests on ROM and EE.
All segments Illuminates all odometer segments.
illuminated
bulb Illuminates all micro-controlled lamps and LEDs (low oil pressure/high coolant temperature, low fuel, service engine soon, brake, low range). INSTALL a new bulb or
LED as necessary.
r Returns to normal operation of all micro-controlled lamps and LEDs and displays hexadecimal value for ROM level (used when requesting assistance from the hotline).
EE Displays hexadecimal value for EE level (used when requesting assistance from the hotline).
dt Displays hexadecimal coding of final manufacturing test date (used when requesting assistance from the hotline).
dtc Displays continuous DTCs. Pressing the SELECT/RESET button will display any DTCs stored before proceeding to the next step.
enG Displays the English speed in mph. Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for
one second or more, or if speed is 0.
m Displays the English speed data (mph) received from the PCM via the SCP network. Displays the metric speed in kph. Speedometer will indicate present speed within
tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
tAc Displays the tachometer data received from the PCM via the SCP network. Tachometer will indicate present speed within tolerances. Display will show 0 if input is not
received, if input received is invalid for one second or more, or if engine rpm is 0.
FUEL Displays the actual A/D fuel level. The fuel gauge will display a filtered fuel level value. This filter will keep the pointer from moving suddenly or erratically. If the value
displayed is between 0 and 20, the circuit is shorted. GO to Pinpoint Test D.

255=open send +/-0

232=Full stop +/-10

215=Full mark +/-10

178=3/4 mark +/-8

138=1/2 mark +/-7

93=1/4 mark +/-5

41=E mark +/-4

54="LOW FUEL" (0-59)

0-18=short (0-20 max.)
OIL Displays the code (0-255) for the oil pressure switch input to the HEC. Displays the oil pressure reading input to the HEC. Oil pressure gauge will indicate present oil
pressure. Normal oil pressure (greater than 6 psi) will display a value between 000 and 176. A low oil pressure (less than 6 psi) or an inoperative engine oil pressure
switch will display a value greater than 176.
dEGC Display of engine temperature in Degrees C input from cylinder head temperature sensor. If the value displayed is -40C, the SCP message for engine temperature has
not been received for more than 5 seconds. GO to Pinpoint Test E.

49 C="C" mark.

60 C=Normal band start.

120 C=Normal band end.

119 C=Temperature warning indicator ON.

"-40" C=No SCP Message for 5 sec.
br Displays the brake fluid level input to the HEC.
bAtt Displays the code (0-255) battery voltage input to the HEC. Battery voltage gauge will indicate present battery voltage.

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93-102=6.9-9.1 volts (low voltage)

115-124=8.5-10.7 volts (norm band start)

215-225=15.8-18 volts (norm band end)

230-241=16.9-19.1 volts (high voltage)

rhEo Displays the present hexadecimal value for the instrument cluster backlighting pulse width modulated (PWM) input to the HEC (used when requesting assistance from
the hotline).
rhi PWM input duty cycle.

rhS SCP hexadecimal dimming step (used when requesting assistance from the hotline).

rho Output driver counts in hexadecimal format (used when requesting assistance from the hotline).
Cr Displays the present RUN/START sense input. Display will show -L with the ignition switch in the START position and -h with the ignition switch in the RUN position.
ALtFa Displays 8-bit hexadecimal value for alternate fuel level. Display will show a value between OO and FF if the message is received.
PA-PE7 Not used.
GAGE Repeats test display cycle.
a Refer to 413-01B (F250 only).

Turn the ignition switch to the OFF position or press and hold the SELECT/RESET button for three or more seconds and release to exit HEC Dealer Test Mode. If no DTCs related to the
concern are retrieved, proceed to the Symptom Chart to continue diagnostics.

Hybrid Electronic Cluster (HEC) Diagnostic Trouble Code (DTC) Index

Diagnostic Tool Dealer Test Mode
Displayed DTC Displayed DTC Description Source Action
B1202 9202 Fuel Sender Open HEC GO to Pinpoint Test C.
B1204 9204 Fuel Sender Short to Ground HEC GO to Pinpoint Test C.
B1213 9213 Anti-Theft Number of Programmed Keys is Below HEC REFER to Section 419-01.
Minimum
B2103 A103 Antenna Not Connected — Defective Transceiver HEC REFER to Section 419-01.
B1317 9317 Battery Voltage High HEC REFER to Section 414-00.
B1318 9318 Battery Voltage Low HEC REFER to Section 414-00.
B1342 9342 ECU Is Defective HEC CLEAR the DTCs. REPEAT the self-test. If DTC B1342, INSTALL a new
instrument cluster. REFER to Instrument Cluster. CLEAR the DTCs.
REPEAT the self-test.
B1356 9356 Ignition RUN Circuit Open HEC GO to Pinpoint Test A.
B1364 9364 Ignition START Circuit Open HEC GO to Pinpoint Test A.
B1600 9600 PATS Ignition Key Transponder Signal Is Not Received HEC REFER to Section 419-01.
— Damaged Key or Non-PATS Key
B1601 9601 PATS Received Incorrect Key-Code From Ignition Key HEC REFER to Section 419-01.
Transponder (Unprogrammed Encoded Ignition Key)
B1602 9602 PATS Received Invalid Format Of Key-Code From HEC REFER to Section 419-01.
Ignition Key Transponder (Partial Key Read)
B1681 9681 PATS Transceiver Signal Is Not Received (Not HEC REFER to Section 419-01.
Connected, Damaged, or Wiring)
B1232 A103 Antenna Not Connected — Defective Transceiver HEC REFER to Section 419-01.
B2139 A139 PCM ID Does Not Match Between HEC and PCM HEC REFER to Section 419-01.
B2141 A141 NVM Configuration Failure (No PCM ID Exchange HEC REFER to Section 419-01.
Between Instrument Cluster and PCM)
B2143 A143 Odometer NVM Memory Failure HEC INSTALL a new instrument cluster. REFER to Instrument Cluster. CLEAR
the DTCs. REPEAT the self-test.
C1284 5284 Oil Pressure Switch Failure HEC GO to Pinpoint Test E.
P1197 1197 SELECT/RESET Switch Circuit Failure HEC INSTALL a new instrument cluster. REFER to Instrument Cluster. CLEAR
the DTCs. REPEAT the self-test.
U1011 D011 SCP (J1850) Invalid or Missing Data for Engine Air PCM CARRY OUT the PCM self-test.
Intake
U1027 D027 SCP (J1850) Invalid or Missing Data for Engine RPM PCM CARRY OUT the PCM self-test.
U1041 D041 SCP (J1850) Invalid or Missing Data for Vehicle Speed PCM CARRY OUT the PCM self-test.
U1073 D073 SCP (J1850) Invalid or Missing Data for Engine PCM CARRY OUT the PCM self-test.
Coolant
U1123 D123 SCP (J1850) Invalid or Missing Data for Odometer PCM CARRY OUT the PCM self-test.
U1131 D131 SCP (J1850) Invalid or Missing Data for Fuel System AFCM CARRY OUT the PCM self-test.
U1132 D132 SCP (J1850) Invalid or Missing Data for Odometer PCM CARRY OUT the PCM self-test.
U1147 D147 SCP (J1850) Invalid or Missing Data for Vehicle PCM REFER to Section 419-01.
Security
U1148 D148 SCP (J1850) Invalid or Missing Data for Audio Control PCM CARRY OUT the PCM self-test.
U1262 D262 Missing SCP Message J1850 REFER to Section 418-00.

Hybrid Electronic Cluster (HEC) Parameter Identification (PID) Index

PID Description Expected Value
CCNT Number of Continuous DTCs in Module one count per bit
PCM_VFY PCM ID Matches Between PCM and HEC NO, YES
NUMKEYS Number of Keys Stored in Module one count per bit
M_KEY Master Key Present notPRE, PRESNT

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ANTISCN Anti-Scan Function DISABL, ENABLE

ENABLE_S Vehicle enable Status DISABL, ENABLE
PCM_ID PCM ID Stored in the HEC notSTR, STORED
VBAT_EC System Battery Voltage Potential notOK, OK
FLDLVLI Brake Fluid Level Input one count per bit
FUELLVL Fuel Level Status %
IGN_O/L Ignition Switch Lock Position NO, YES
IGN_R Ignition Switch - RUN Position NO, YES
IGN_S Ignition Switch - START Position NO, YES
OIL_PSW Oil Pressure Switch Control one count per bit
RFSIGNAL RF OFF, ON
BACK_LT PWM Output %
RESETSW Reset Switch OFF, ON
VBAT Battery Voltage VDC

Hybrid Electronic Cluster (HEC) Active Command Index

Active Command Display Action
ANTI-THEFT INDICATOR LAMP THEFT LAMP OFF, ON
SPEEDOMETER CONTROL SPDOMETER %
FUEL GAUGE CONTROL FUELLEVEL %
ENGINE COOLANT GAUGE CONTROL ENGCOOLNT %
TACHOMETER CONTROL TCHOMETER %
INDICATOR LAMP CONTROL MIL OFF, ON
INDICATOR LAMP CONTROL II (Check Gauge Indicator) OFF, ON
INDICATOR LAMP CONTROL II FUEL LOW OFF, ON
4WD TRANSFER CASE CONTROL LOW LAMP OFF, ON
WARNING LAMPS AND CHIME ALL LAMPS OFF, ON
BATTERY VOLTAGE INDICATOR CONTROL BATTERY I %
OIL PRESSURE GAUGE CONTROL OIL GAUGE %
DISPLAY DIMMING CONTROL ILLUMINATE OFF, ON
DISPLAY SEGMENT CONTROL SEGMENTS OFF, ON

Generic Electronic Module (GEM)/Central Timer Module (CTM) Diagnostic Trouble Code (DTC) Index
DTC Description Source Action
B1302 Accessory Delay Relay Coil Circuit Failure GEM REFER to Section 501-11.
B1304 Accessory Delay Relay Coil Circuit Short to Battery GEM REFER to Section 501-11.
B1313 Battery Saver Relay Coil Circuit Failure GEM/CTM REFER to Section 417-02.
B1315 Battery Saver Relay Coil Circuit Short to Battery GEM/CTM REFER to Section 417-02.
B1317 Battery Voltage High GEM/CTM REFER to Section 414-00.
B1318 Battery Voltage Low GEM/CTM REFER to Section 414-00.
B1322 Driver Door Ajar Circuit Short to Ground GEM/CTM REFER to Section 417-02.
B1323 Door Ajar Lamp Circuit Failure GEM/CTM If lamp is never on, GO to Pinpoint Test J. If lamp is always on, GO to Pinpoint Test K.
B1325 Door Ajar Lamp Circuit Short to Battery GEM/CTM GO to Pinpoint Test J.
B1330 Passenger Door Ajar Circuit Short to Ground GEM/CTM REFER to Section 417-02.
B1340 Chime Input Request Circuit Short to Ground GEM/CTM REFER to Section 413-09.
B1342 ECU Is Defective GEM/CTM CLEAR and DOCUMENT the DTCs. CARRY OUT the instrument cluster self-test. INSTALL a new
instrument cluster if DTC B1342 is retrieved again. REFER to Instrument Cluster.
B1352 Ignition Key-In Circuit Failure GEM/CTM REFER to Section 413-09.
B1355 Ignition Run Circuit Failure GEM/CTM REFER to Section 211-05.
B1359 Ignition Run/Acc Circuit Failure GEM/CTM REFER to Section 211-05.
B1365 Ignition Start Circuit Short to Battery GEM/CTM REFER to Section 211-05.
B1371 Illuminated Entry Relay Circuit Failure GEM/CTM REFER to Section 417-02.
B1373 Illuminated Entry Relay Short to Battery GEM/CTM REFER to Section 417-02.
B1398 Driver Power Window One Touch Window Relay Circuit GEM REFER to Section 501-11.
Failure
B1400 Driver Power Window One Touch Window Relay Circuit GEM REFER to Section 501-11.
Short to Battery
B1405 Driver Power Window Down Circuit Short to Battery GEM REFER to Section 501-11.
B1410 Driver Power Window Motor Circuit Failure GEM REFER to Section 501-11.
B1426 Lamp Safety Belt Circuit Short to Battery GEM/CTM GO to Pinpoint Test H.
B1428 Lamp Safety Belt Circuit Failure GEM/CTM If lamp is never on, GO to Pinpoint Test H. If lamp is always on, GO to Pinpoint Test I.
B1431 Wiper Brake/Run Relay Circuit Failure GEM/CTM REFER to Section 501-16.
B1432 Wiper Brake/Run Relay Circuit Short to Battery GEM/CTM REFER to Section 501-16.
B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure GEM/CTM REFER to Section 501-16.
B1436 Wiper Hi/Low Speed Relay Coil Circuit Short to Battery GEM/CTM REFER to Section 501-16.

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B1438 Wiper Mode Select Switch Circuit Failure GEM/CTM REFER to Section 501-16.
B1441 Wiper Mode Select Switch Circuit Short to Ground GEM/CTM REFER to Section 501-16.
B1446 Wiper Park Sense Circuit Failure GEM/CTM REFER to Section 501-16.
B1450 Wiper Wash/Delay Switch Circuit Failure GEM/CTM REFER to Section 501-16.
B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM/CTM REFER to Section 501-16.
B1458 Wiper Washer Pump Motor Relay Circuit Failure GEM/CTM REFER to Section 501-16.
B1460 Wiper Washer Pump Motor Relay Coil Circuit Short to GEM/CTM REFER to Section 501-16.
Battery
B1462 Safety Belt Switch Circuit Failure GEM/CTM REFER to Section 413-09.
B1466 Wiper Hi/Low Speed Not Switching GEM/CTM REFER to Section 501-16.
B1467 Wiper Hi/Low Speed Circuit Motor Short to Battery CTM REFER to Section 501-16.
B1473 Wiper Low Speed Circuit Motor Failure GEM/CTM REFER to Section 501-16.
B1476 Wiper High Speed Circuit Motor Failure GEM/CTM REFER to Section 501-16.
B1483 Brake Pedal Input Circuit Failure GEM REFER to Section 308-07A.
B1485 Brake Pedal Input Circuit Battery Short GEM REFER to Section 308-07A.
B1577 Lamp Park Input Circuit Short to Battery GEM/CTM REFER to Section 413-09.
B1610 Illuminated Entry Input Short Circuit to Ground GEM REFER to Section 417-02.
B1840 Wiper Front Power Circuit Failure GEM/CTM REFER to Section 501-16.
P0500 Vehicle Speed Sensor Malfunction GEM REFER to Section 308-07A.
P1804 Transmission 4-Wheel Drive High Indicator Circuit GEM GO to Pinpoint Test N.
Failure
P1806 Transmission 4-Wheel Drive High Indicator Short Circuit GEM GO to Pinpoint Test N.
to Battery
P1812 Transmission 4-Wheel Drive Mode Select Circuit GEM REFER to Section 308-07A.
Failure
P1815 Transmission 4-Wheel Drive Mode Select Short Circuit GEM REFER to Section 308-07A.
to Ground
P1820 Transmission Transfer Case Clockwise Shift Relay Coil GEM REFER to Section 308-07A.
Circuit Failure
P1822 Transmission Transfer Case Clockwise Shift Relay Coil GEM REFER to Section 308-07A.
Short Circuit to Battery
P1824 Transmission 4-Wheel Drive Clutch Relay Circuit GEM REFER to Section 308-07A.
Failure
P1826 Transmission 4-Wheel Drive Low Clutch Relay Short GEM REFER to Section 308-07A.
Circuit to Battery
P1828 Transmission Transfer Case Counter Clockwise Shift GEM REFER to Section 308-07A.
Relay Coil Circuit Failure
P1830 Transmission Transfer Case Counter Clockwise Shift GEM REFER to Section 308-07A.
Relay Coil Short Circuit to Battery
P1832 Transmission Transfer Case Differential Lock-Up GEM REFER to Section 308-07A.
Solenoid Circuit Failure
P1834 Transmission Transfer Case Differential Lock-Up GEM REFER to Section 308-07A.
Solenoid Short Circuit to Battery
P1838 Transmission Transfer Case Shift Motor Circuit Failure GEM REFER to Section 308-07A.
P1846 Transmission Transfer Case Contact Plate 'A' Circuit GEM REFER to Section 308-07A.
Failure
P1850 Transmission Transfer Case Contact Plate 'B' Circuit GEM REFER to Section 308-07A.
Failure
P1854 Transmission Transfer Case Contact Plate 'C' Circuit GEM REFER to Section 308-07A.
Failure
P1858 Transmission Transfer Case Contact Plate 'D' Circuit GEM REFER to Section 308-07A.
Failure
P1866 Transmission Transfer Case System Concern - GEM REFER to Section 308-07A.
Servicing Required
P1867 Transmission Transfer Case Contact Plate General GEM REFER to Section 308-07A.
Circuit Failure
P1876 Transmission Transfer Case 2-Wheel Drive Solenoid GEM REFER to Section 308-07A.
Circuit Failure
P1877 Transmission Transfer Case 2-Wheel Drive Solenoid GEM REFER to Section 308-07A.
Circuit Short to Battery
P1891 Transmission Transfer Case Contact Plate Ground GEM REFER to Section 308-07A.
Return Open Circuit

Generic Electronic Module (GEM)/Central Timer Module (CTM) Parameter Identification (PID) Index
PID Description Expected Value
2WDSOL 2 Wheel Drive Solenoid Status Off---, OffO-G, On---, On-B-
4WD_SW 4WD Input Switch 2WD, 4WDLOW, 4WDHGH, OPEN, GSHORT
4WDELCL 4WD Electronic Clutch Output Off---, OffO-G, On---, On-B-
4WDHIGH 4WD-Wheel High Output State Off---, OffO-G, On---, On-B-
4WDSOL 4 Wheel Drive Solenoid Status Off---, OffO-G, On---, On-B-
ACCDLY Accessory Delay Relay Circuit Off---, OffO-G, On---, On-B-
BATSAV Battery Saver Relay Circuit Off---, OffO-G, On---, On-B-
BOO Brake Switch Input OFF, ON

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CCNT Number Of Continuous DTCs In Module one count per bit

CHIMERQ Chime Request OFF, ON
CLTCHSW Trans. Clutch Interlock Sw. notEGD, ENGAGD
D_DN_SW Driver Window Down Switch OFF, DOWN
D_DOOR Left Front Door Ajar Switch CLOSED, AJAR
D_PWAMP Driver Power Window Motor Current AMP
D_PWPK Driver Power Window Peak Current AMP
D_PWRLY Driver Power Window Off---, OffO-G, On---, On-B-
D_SBELT Driver Seat Belt OUT, IN
DRAJR_L Door Ajar Warning Lamp Circuit Off---, OffO-G, On---, On-B-
IGN_A Ignition Switch -ACCY Position NO, YES
IGN_KEY Ignition Key In / Out OUT, IN
IGN_O/L Ignition Switch -OFF/Lock Position NO, YES
IGN_R Ignition Switch -RUN Position NO, YES
IGN_S Ignition Switch -START Position NO, YES
INTLMP Illuminated Entry Relay Circuit Off---, OffO-G, On---, On-B-
MTR_CCW Trans. Xfer Counter Cw Motor Output Off---, OffO-G, On---, On-B-
MTR_CW Trans. Xfer Clockwise Motor Output Off---, OffO-G, On---, On-B-
NTRL_SW Neutral Safety Switch Input notNTL, NTRL
OTD_SW One Touch Down Switch OFF, DOWN
OVERSPD Vehicle Overspeed Warning Status DISABL, ENABLE
P_DOOR Passenger Door Ajar Switch CLOSED, AJAR
PARK_SW Parking Sw OFF, ON
PLATE_A Trans. Xfer Case Contact Plate A OPEN, CLOSED
PLATE_B Trans. Xfer Case Contact Plate B OPEN, CLOSED
PLATE_C Trans. Xfer Case Contact Plate C OPEN, CLOSED
PLATE_D Trans. Xfer Case Contact Plate D OPEN, CLOSED
PLATEPW Trans. Xfer Case Contact Plt Pul Wid Off---, OffO-G, On---, On-B-
SBLTLMP Seat Belt Lamp Circuit Off---, OffO-G, On---, On-B-
SPEEDWP Speed Dependent Wiper Function notACT, ACTIVE
VBAT Battery Voltage Voltage Range
VSS Vehicle Speed KPH
VSS Vehicle Speed Low Resolution (Mph) MPH
WASH_SW Washer Pump Switch OFF, ON
WASHRLY Washer Pump Relay Circuit Off---, OffO-G, On---, On-B-
WPHISP Wiper Two Speed Relay Off---, OffO-G, On---, On-B-
WPMODE Wiper Control Mode Select WASH, OPEN, OFF, INTVL1, INTVL2, INTVL3, INTVL4, INTVL5, INTVL6, INTVL7, LOW, HIGH, ?
WPPK_PK Wiper Park-To-Park Time mS
WPPRKSW Windshield Wiper Park Sense notPRK, PARKED
WPRUN Wiper Run Relay Driver State Off---, OffO-G, On---, On-B-

Generic Electronic Module (GEM)/Central Timer Module (CTM) Active Command Index
Active Command Display Action
4WD TRANSFER CASE CONTROL AXLE DSCN OFF, ON
4WD TRANSFER CASE CONTROL AXLE ENGG OFF, ON
4WD TRANSFER CASE CONTROL CW/CCW OFF, ON
4WD TRANSFER CASE CONTROL CW/CCW OFF, ON
4WD TRANSFER CASE CONTROL HIGH LAMP OFF, ON
4WD TRANSFER CASE CONTROL PLATE PWR OFF, ON
4WD TRANSFER CASE CONTROL SHFT CLCH OFF, ON
BATTERY SAVER & COURTESY ENTRY BATT SAVR OFF, ON
BATTERY SAVER & COURTESY ENTRY INT LAMPS OFF, ON
FRONT WINDSHIELD WIPER/WASHER SPEED RLY OFF, ON
FRONT WINDSHIELD WIPER/WASHER WASH RLY OFF, ON
FRONT WINDSHIELD WIPER/WASHER WIPER RLY OFF, ON
MODULE OPTION CONTENT SPD WARN OFF, ON
MODULE OPTION CONTENT SPD WIPER OFF, ON
MODULE SLEEP COMMAND MODULE SLEEP COMMAND OFF, ON
ONE TOUCH WINDOW DOWN & ACCY DELAY ACCY RLY OFF, ON
ONE TOUCH WINDOW DOWN & ACCY DELAY ONE TOUCH OFF, ON
PID LATCH PID LATCH OFF, ON
REAR WIPER DWN RELAY OFF, ON
REAR WIPER UP RELAY OFF, ON
REAR WIPER WASH RLY OFF, ON
WARNING LAMPS AND CHIME AJAR LAMP OFF, ON
WARNING LAMPS AND CHIME CHIME OFF, ON

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WARNING LAMPS AND CHIME SBLT LAMP OFF, ON

Symptom Chart

Symptom Chart
Condition Possible Sources Action

No communication with the hybrid electronic
Central junction box (CJB) Fuses 2
GO to Pinpoint Test A.
instrument cluster (HEC) module (5A), 6 (5A), 30 (30A).

Circuitry.

J1850 Communication Network (SCP).

Instrument cluster.

No communication with the generic electronic
Central junction box (CJB) Fuses 6
GO to Pinpoint Test B.
module (GEM) or central timer module (CTM) (5A), 8 (5A), 15 (5A), and 20 (5A).

Battery junction box (BJB) Fuse 103
(50A).

Circuitry.

Generic electronic module
(GEM)/central timer module (CTM).

A single gauge does not return to zero with the
Instrument cluster.
INSTALL a new instrument cluster. REFER to
ignition switch off Instrument Cluster. TEST the system for normal
operation.

Incorrect fuel gauge indication
Circuitry.
GO to Pinpoint Test C.

Fuel pump assembly.

Instrument cluster.

Fuel tank.

The LOW FUEL warning indicator is never/always
Instrument cluster.
GO to Pinpoint Test D.
on
Bulb.

Incorrect voltage gauge indication
Circuitry.
REFER to Section 414-00.

Generator.

Instrument cluster.

Incorrect oil pressure gauge indication
Circuitry.
GO to Pinpoint Test E.

Engine oil pressure switch.

Instrument cluster.

Oil gauge reads normal with engine off
Instrument cluster.
INSTALL a new instrument cluster. REFER to
Instrument Cluster. CLEAR the DTCs. REPEAT the
self-test.

Low oil level warning indicator stays illuminated;
Instrument cluster.
GO to Pinpoint Test E.
temperature gauge reads normal
Low or no oil pressure.

Engine oil pressure switch.

Circuitry.

Incorrect temperature gauge indication
Circuitry.
GO to Pinpoint Test F.

Instrument cluster.

Powertrain control module (PCM).

Engine coolant temperature sensor.

The temperature warning indicator
Instrument cluster.
INSTALL a new instrument cluster. REFER to
flickers/temperature gauge reads fully hot Instrument Cluster. CLEAR the DTCs. REPEAT the
self-test.

The speedometer/odometer is inoperative
Circuitry.
GO to Pinpoint Test G.

Powertrain control module (PCM).

Instrument cluster.

The tachometer is inoperative
Instrument cluster.
INSTALL a new instrument cluster. REFER to
Instrument Cluster. CLEAR the DTCs. REPEAT the
self-test.

Incorrect tachometer indication
Instrument cluster.
INSTALL a new instrument cluster. REFER to
Instrument Cluster. CLEAR the DTCs. REPEAT the
self-test.

An indicator is inoperative/always on — low oil
Instrument cluster.
INSTALL a new instrument cluster. REFER to
pressure
Bulb. Instrument Cluster. CLEAR the DTCs. REPEAT the
self-test.

The safety belt warning indicator is inoperative
Circuitry.
GO to Pinpoint Test H.
(chime is operative)
Seat belt switch.

Generic electronic module
(GEM)/central timer module (CTM).

Bulb.

Instrument cluster.

The safety belt warning indicator does not operate
Circuitry.
GO to Pinpoint Test I.
correctly (chime is operative)
Seat belt switch.

Generic electronic module
(GEM)/central timer module (CTM).

Instrument cluster.

The DOOR AJAR indicator is inoperative (chime is
Circuitry.
GO to Pinpoint Test J.
operative)
Door ajar switch.

Instrument cluster safety belt warning
indicator bulb.

Generic electronic module
(GEM)/central timer module (CTM).

Instrument cluster.

Inaccurate speedometer reading
Circuitry.
GO to Pinpoint Test G.

Powertrain control module (PCM).

Instrument cluster.

The DOOR AJAR indicator does not operate
Circuitry.
GO to Pinpoint Test K.
correctly (chime is operative)
Door ajar switch.

Generic electronic module
(GEM)/central timer module (CTM).

Instrument cluster.

The BRAKE warning indicator is never/always on
Circuitry.
GO to Pinpoint Test L.

Brake fluid level.

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Parking brake switch.

Fluid level indicator switch.

Bulb.

Instrument cluster.

Anti-lock brake control module (RABS
only).

The charge system warning indicator is
Circuitry.
GO to Pinpoint Test M.
never/always on
Generator (GEN).

Bulb.

Instrument cluster.

The 4X4 indicator lamp is never/always on
Circuitry.
GO to Pinpoint Test N.

Generic electronic module (GEM).

Bulb.

Instrument cluster.

The LOW RANGE indicator lamp is never/always
Circuitry.
REFER to Powertrain Control/Emissions Diagnosis
on
Powertrain control module (PCM). (PC/ED) manual.

Bulb.

Instrument cluster.

An indicator is inoperative/always on — high beam
Circuitry.
GO to Pinpoint Test O.

Bulb.

Instrument cluster.

An indicator is inoperative/always on — air bag
Circuitry.
REFER to Section 501-20B.
warning
Bulb.

Instrument cluster.

RCM.

An indicator is inoperative/always on — ABS
Circuitry.
GO to Pinpoint Test P.
warning
Bulb.

Instrument cluster.

ABS module.

An indicator is inoperative/always on — SERVICE
Circuitry.
GO to Pinpoint Test Q.
ENGINE SOON
Bulb.

Instrument cluster.

Powertrain control module (PCM).

An indicator is inoperative/always on —
Circuitry.
GO to Pinpoint Test R.
turn/hazard
Bulb(s).

Instrument cluster.

An speed control indicator is never on
Circuitry.
GO to Pinpoint Test S.

Bulb.

Instrument cluster.

Speed control.

The speed control is always on
Circuitry.
REFER to Section 310-03.

Speed control servo.

An indicator is inoperative/always on — THEFT
Circuitry.
REFER to Section 419-01.

LED.

Instrument cluster.

The integrated circuit display is inoperative/erratic
Instrument Cluster.
CARRY OUT HEC Dealer Test Mode.

A gauge is inoperative — boost gauge
Pressure/vacuum line.
GO to Pinpoint Test T.

Instrument cluster.

Pinpoint Tests

PINPOINT TEST A: NO COMMUNICATION WITH THE HYBRID ELECTRONIC INSTRUMENT CLUSTER (HEC) MODULE

CONDITIONS DETAILS/RESULTS/ACTIONS
A1 CHECK CIRCUIT 729 (RD/WH) FOR VOLTAGE

Instrument Cluster C236

Measure voltage between instrument cluster C236 pin 10, circuit 729 (RD/WH), harness side and ground.

Is the voltage greater than 10 volts?

Yes
GO to A2.

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No
REPAIR the circuit. TEST the system for normal operation.
A2 CHECK CIRCUIT 1003 (GY/YE) FOR VOLTAGE

Measure the voltage between instrument cluster C236 pin 11, circuit 1003 (GY/YE), harness side and ground.

Is the voltage greater than 10 volts?

Yes
GO to A3.

No
REPAIR the circuit. TEST the system for normal operation.
A3 CHECK CIRCUIT 16 (RD/LG) FOR VOLTAGE

Measure the voltage between instrument cluster C236 pin 2, circuit 16 (RD/LG), harness side and ground.

Is the voltage greater than 10 volts?

Yes
GO to A4.

No
REPAIR the circuit. TEST the system for normal operation.
A4 CHECK CIRCUIT 57 (BK) FOR OPEN

Measure the resistance between instrument cluster C236 pin 1, circuit 57 (BK), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to A5.

No
REPAIR the circuit. TEST the system for normal operation.
A5 CHECK CIRCUIT 676 (PK/OG)

Instrument Cluster C237

Measure the resistance between instrument cluster C237 pin 17, circuit 676 (PK/OG), harness side and ground.

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Is the resistance less than 5 ohms?

Yes
REFER to Section 418-00.

No
REPAIR the circuit. TEST the system for normal operation.

PINPOINT TEST B: NO COMMUNICATION WITH THE MODULE — GENERIC ELECTRONIC MODULE (GEM) OR CENTRAL TIMER MODULE (CTM)

CONDITIONS DETAILS/RESULTS/ACTIONS
B1 CHECK THE IGNITION STATES — MONITOR THE GEM/CTM PIDS

Select the GEM/CTM PID for the ignition switch.

GEM

NOTE: If the vehicle is equipped with a manual transmission, depress the clutch pedal when turning the ignition
switch to START.

Monitor the GEM/CTM PID IGN_S, IGN_R, IGN_O/L, IGN_A, while turning the ignition switch through the
START, RUN, OFF and ACC positions.

Do the GEM/CTM PID values agree with the ignition switch positions?

Yes
GO to B2.

No
REPAIR the ignition circuit (RUN/ACC: circuit 297 [BK/LG], RUN: circuit 1040 [RD/LB], START: circuit 32 [RD/LB]
or circuit 481 [GY/YE]) in question. TEST the system for normal operation.
B2 CHECK CIRCUIT 1052 (TN/BK) FOR VOLTAGE

CJB C243

Measure the voltage between CJB C243 pin 11, circuit 1052 (TN/BK), harness side and ground.

Is the voltage greater than 10 volts?

Yes
GO to B3.

No
REPAIR the circuit. TEST the system for normal operation.
B3 CHECK CJB FOR VOLTAGE

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GEM/CTM C267

CJB C243

Measure the voltage between CJB C267 pin 4 (component side), and ground; and between CJB C267 pin 16
(component side), and ground.

Are the voltages greater than 10 volts?

Yes
GO to B4.

No
INSTALL a new CJB. TEST the system for normal operation.
B4 CHECK THE CJB

CJB C243

Measure the resistances between CJB C243 pin 11 (component side), and CJB C267 pin 4 (component side);
and between CJB C243 pin 11 (component side), and CJB C267 pin 16 (component side).

Are the resistances less than 5 ohms?

Yes
GO to B5.

No
INSTALL a new CJB. TEST the system for normal operation.
B5 CHECK CIRCUIT 875 (BK/LB) FOR CONTINUITY TO GROUND

GEM/CTM C239

Measure the resistance between GEM/CTM C239 pin 26, circuit 875 (BK/LB), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to B6.

No

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REPAIR the circuit. TEST the system for normal operation.

B6 CHECK CIRCUIT 875 (BK/LB) FOR OPEN

Measure the resistance between GEM/CTM C239 pin 14, circuit 875 (BK/LB), harness side and ground.

Is the resistance less than 5 ohms?

Yes
REFER to Section 418-00.

No
REPAIR the circuit. TEST the system for normal operation.

PINPOINT TEST C: INCORRECT FUEL GAUGE INDICATION

CONDITIONS DETAILS/RESULTS/ACTIONS
C1 CARRY OUT THE INSTRUMENT CLUSTER FUEL GAUGE ACTIVE COMMAND
NOTE: Fuel fills of less than 22.7 liters (6 gallons) require at least 5-20 minutes to update the fuel gauge indication.

HEC

Select the instrument cluster FUEL LEVEL CONTROL active command. Trigger, monitor, and scroll FUELLEVEL
at: 0% , 54%, and 100%.

Does the fuel gauge display: below E with 0%, half with 54%, and full stop with 100%?

Yes
GO to C2.

No
GO to C8.
C2 CHECK THE FUEL GAUGE OPERATION

Fuel Pump Assembly C415

Connect one lead of Instrument Gauge System Tester to the fuel pump assembly C415 pin 2, circuit 29 (YE/WH),
harness side and the other lead of Instrument Gauge System Tester to the fuel pump assembly C415 pin 3,
circuit 396 (BK/OG), harness side.

Set Instrument Gauge System Tester to 160 ohms.

Wait one minute for the gauge to respond.

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Set Instrument Gauge System Tester to 15 ohms.

NOTE: The fuel gauge should read below E (empty mark) when carrying out this test step.

Wait one minute and read the fuel gauge.

Set Instrument Gauge System Tester to 160 ohms.

NOTE: The fuel gauge should read F (full) or above when carrying out this test step.

Wait one minute and read the fuel gauge.

Does the fuel gauge operate correctly?

Yes
GO to C3.

No
GO to C5.
C3 CHECK THE FUEL TANK

Check the fuel tank for any damage or deformation.

Is the fuel tank OK?

Yes
GO to C4.

No
INSTALL a new fuel tank. REFER to Section 310-01A. TEST the system for normal operation.
C4 INSPECT THE FUEL PUMP ASSEMBLY

Check the fuel pump assembly in-tank mounting, float, float rod, wiring and connections for damage or
obstruction.

Are the fuel pump assembly and wiring OK?

Yes
INSTALL a new fuel sender. TEST the system for normal operation.

No
REPAIR or INSTALL a new fuel pump assembly as necessary. TEST the system for normal operation.
C5 CHECK CIRCUIT 29 (YE/WH) FOR SHORT TO POWER

Instrument Cluster C237

Measure the voltage between the instrument cluster C237 pin 3, circuit 29 (YE/WH), harness side and ground.

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Is any voltage present?

Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to C6.
C6 CHECK THE FUEL PUMP ASSEMBLY FEED CIRCUIT 29 (YE/WH)

Measure the resistances between instrument cluster C237 pin 3, circuit 29 (YE/WH), harness side and fuel pump
assembly C415 pin 2, circuit 29 (YE/WH), harness side; and between instrument cluster C237 pin 3, circuit 29
(YE/WH), harness side and ground.

Is the resistance less than 5 ohms between the instrument cluster and fuel sender and greater than
10,000 ohms between the instrument cluster and ground?

Yes
GO to C7.

No
REPAIR the circuit. TEST the system for normal operation.
C7 CHECK FUEL SENDING UNIT GROUND CIRCUIT 396 (BK/OG) AND CIRCUIT 676 (PK/OG)

Measure the resistance between instrument cluster C237 pin 17, circuit 676 (PK/OG), harness side and fuel
pump assembly C415 pin 3, circuit 396 (BK/OG), harness side.

Is the resistance less than 5 ohms?

Yes
GO to C8.

No
REPAIR circuit 676 (PK/OG) or circuit 396 (BK/OG) as necessary. TEST the system for normal operation.
C8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST D: THE LOW FUEL WARNING INDICATOR IS NEVER/ALWAYS ON

CONDITIONS DETAILS/RESULTS/ACTIONS
D1 THE LOW FUEL GAUGE WARNING INDICATOR IS NEVER/ALWAYS ON

Check the fuel gauge for correct operation.

Is the fuel gauge operating correctly?

Yes

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INSTALL a new instrument cluster. REFER to Instrument Cluster. CLEAR the DTCs. REPEAT the self-test.

No
GO to Pinpoint Test C.

PINPOINT TEST E: INCORRECT OIL PRESSURE GAUGE INDICATION

CONDITIONS DETAILS/RESULTS/ACTIONS
E1 CHECK CIRCUIT 31 (WH/RD) FOR AN OPEN

Engine Oil Pressure Switch C101

Connect a fused jumper wire between engine oil pressure switch C101, circuit 31 (WH/RD), harness side and
ground.

Does the instrument cluster indicate normal oil pressure with the jumper wire connected and no engine
oil pressure with the jumper wire disconnected?

Yes
GO to E2.

No
GO to E3.
E2 CHECK THE ENGINE OIL PRESSURE

Carry out the engine oil pressure test. Refer to Section 303-00.

Is the engine oil pressure within specification?

Yes
INSTALL a new engine oil pressure switch. TEST the system for normal operation.

No
REFER to Section 303-00.
E3 CHECK CIRCUIT 31 (WH/RD)

Instrument Cluster C236

Measure the resistances between instrument cluster C236 pin 20, circuit 31 (WH/RD), harness side and engine
oil pressure switch C101, circuit 31 (WH/RD), harness side; and between instrument cluster C236 pin 20, circuit
31 (WH/RD), harness side and ground.

Is the resistance less than 5 ohms between the instrument cluster and the engine oil pressure switch,
and greater than 10,000 ohms between the instrument cluster and ground?

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Yes
GO to E4.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
E4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST F: INCORRECT TEMPERATURE GAUGE INDICATION

CONDITIONS DETAILS/RESULTS/ACTIONS
F1 CARRY OUT THE INSTRUMENT CLUSTER ENGINE COOLANT TEMPERATURE GAUGE ACTIVE COMMAND

Diagnostic Tool

Trigger instrument cluster active command ENGCOOLNT. Monitor the engine coolant temperature gauge while adjusting the ENGCOOLNT active command to
read 50% and 100%.

Does the temperature gauge start at cold, move to half at 50%, and full hot at 100%?

Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to F2.
F2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the HEC self-test.

No
The system is operating correctly at this time. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST G: THE SPEEDOMETER/ODOMETER IS INOPERATIVE

CONDITIONS DETAILS/RESULTS/ACTIONS
G1 CARRY OUT THE INSTRUMENT CLUSTER SPEEDOMETER ACTIVE COMMAND

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Diagnostic Tool

Trigger the instrument cluster active command SPDOMETER, and scroll in increments of 5%. Monitor the speedometer gauge. The speedometer should be
increasing in increments of 16.7 kph (10 mph) for every 5%.

Does the speedometer indication agree with the active command?

Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to G2.
G2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the HEC self-test.

No
The system is operating correctly at this time. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST H: THE SAFETY BELT WARNING INDICATOR IS INOPERATIVE (CHIME IS OPERATIVE)

CONDITIONS DETAILS/RESULTS/ACTIONS
H1 CHECK THE VEHICLE OPTION CONTENT

Verify the option content of the vehicle.

Is the vehicle equipped with a GEM?

Yes
GO to H2.

No
GO to H7.
H2 MONITOR THE GEM PID SBLTLMP

Diagnostic Tool

Monitor the GEM PID SBLTLMP while toggling the active command SBLT LAMP OFF and ON.

Does the GEM PID SBLTLMP indicate OFF---, ON---?

Yes
GO to H11.

No
If the GEM PID SBLTLMP indicates OFFO-G, GO to H3 .

If the GEM PID SBLTLMP indicates OFF-B-, GO to H5 .

H3 CHECK THE INSTRUMENT CLUSTER INPUT

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GEM C239

Connect a fused jumper wire between GEM C239 pin 12, circuit 450 (DG/LG), harness side and ground.

Does the seat belt indicator illuminate?

Yes
GO to H11.

No
GO to H4.
H4 CHECK INSTRUMENT CLUSTER CIRCUIT 450 (DG/LG) FOR AN OPEN

Instrument Cluster C237

Measure the resistance between instrument cluster C237 pin 10, circuit 450 (DG/LG), harness side and GEM
C239 pin 12, circuit 450 (DG/LG), harness side.

Is the resistance less than 5 ohms?

Yes
GO to H12.

No
REPAIR the circuit. TEST the system for normal operation.
H5 MONITOR THE GEM PID SBLTLMP WITH THE INSTRUMENT CLUSTER C237 DISCONNECTED

Monitor the GEM PID SBLTLMP while toggling the active command SBLTLMP OFF and ON.

Does the GEM PID SBLTLMP indicate ON-B-?

Yes
GO to H6.

No
GO to H12.
H6 CHECK CIRCUIT 450 (DG/LG) FOR SHORT TO POWER

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GEM C239

Measure the voltage between GEM C239 pin 12, circuit 450 (DG/LG), harness side and ground.

Is any voltage indicated?

Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to H11.
H7 MONITOR THE CTM PID SBLTLMP

Diagnostic Tool

Monitor the CTM PID SBLTLMP while toggling the active command SBLT LAMP OFF and ON.

Does the CTM PID SBLTLMP indicate OFF---, ON---?

Yes
GO to H8.

No
GO to H11.
H8 CHECK THE INSTRUMENT CLUSTER FOR AN OPEN

Instrument Cluster C237

Instrument Cluster C236

Measure the resistance between instrument cluster C237 pin 10, component side and C236 pin 2, component
side.

Is the resistance less than 5 ohms?

Yes
GO to H9.

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No
GO to H12.
H9 CHECK CIRCUIT 450 (DG/LG) FOR AN OPEN

CTM C239

Measure the resistance between instrument cluster C237 pin 10, circuit 450 (DG/LG), harness side and CTM
C239 pin 12, harness side.

Is the resistance less than 5 ohms?

Yes
GO to H10.

No
REPAIR the circuit. TEST the system for normal operation.
H10 CHECK CIRCUIT 450 (DG/LG) FOR SHORT TO POWER

Measure the resistance between instrument cluster C237 pin 10, circuit 450 (DG/LG), harness side and ground.

Is any voltage indicated?

Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to H11.
H11 CHECK FOR CORRECT GEM OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new GEM. REFER to Section 419-10. CLEAR the DTCs. REPEAT the GEM self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.
H12 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

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Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST I: THE SAFETY BELT WARNING INDICATOR DOES NOT OPERATE CORRECTLY (CHIME IS OPERATIVE)

CONDITIONS DETAILS/RESULTS/ACTIONS
I1 CHECK THE VEHICLE OPTION CONTENT

Verify the option content of the vehicle.

Is the vehicle equipped with a GEM?

Yes
GO to I2.

No
GO to I5.
I2 MONITOR THE GEM PID SBLTLMP

Diagnostic Tool

Monitor the GEM PID SBLTLMP while toggling the active command SBLT LAMP OFF and ON.

GEM Active Command

Does the GEM PID SBLTLMP indicate OFF---, ON---?

Yes
GO to I8.

No
GO to I3.
I3 CHECK THE GEM — DISCONNECT GEM C239

GEM C239

Does the safety belt indicator stay on continuously?

Yes
GO to I4.

No
GO to I8.
I4 CHECK CIRCUIT 450 (DG/LG) FOR SHORT TO GROUND

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Instrument Cluster C237

Measure the resistance between GEM C239 pin 12, circuit 450 (DG/LG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to I9.

No
REPAIR the circuit. TEST the system for normal operation.
I5 MONITOR THE CTM PID SBLTLMP

Diagnostic Tool

Monitor the CTM PID SBLTLMP while toggling the active command SBLT LAMP OFF and ON.

Does the CTM PID SBLTLMP indicate OFF---, ON---?

Yes
GO to I6.

No
GO to I8.
I6 CHECK THE CTM FOR CONCERN — DISCONNECT CTM C239

CTM C239

Does the safety belt indicator stay on continuously?

Yes
GO to I7.

No
GO to I8.
I7 CHECK CIRCUIT 450 (DG/LG) FOR SHORT TO GROUND

Instrument Cluster C237

Measure the resistance between CTM C239 pin 12, circuit 450 (DG/LG), harness side and ground.

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Is the resistance greater than 10,000 ohms?

Yes
GO to I9.

No
REPAIR the circuit. TEST the system for normal operation.
I8 CHECK FOR CORRECT GEM OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new GEM. REFER to Section 419-10. CLEAR the DTCs. REPEAT the GEM self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.
I9 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST J: THE DOOR AJAR INDICATOR IS INOPERATIVE (CHIME IS OPERATIVE)

CONDITIONS DETAILS/RESULTS/ACTIONS
J1 CHECK THE VEHICLE OPTION CONTENT

Verify the option content of the vehicle.

Is the vehicle equipped with a GEM?

Yes
GO to J2.

No
GO to J7.
J2 MONITOR THE GEM PID DRAJAR

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Diagnostic Tool

Monitor the GEM PID DRAJAR while toggling the active command AJAR LAMP OFF and ON.

Does the GEM PID DRAJAR indicate OFF---, ON---?

Yes
GO to J11.

No
If the GEM PID DRAJAR indicates OFFO-G, GO to J3 .

If the GEM PID DRAJAR indicates OFF-B-, GO to J5 .

J3 CHECK THE INSTRUMENT CLUSTER INPUT

GEM C239

Connect a fused jumper wire between GEM C239 pin 9, circuit 433 (DG/OG), harness side and ground.

Does the DOOR AJAR indicator illuminate?

Yes
GO to J11.

No
GO to J4.
J4 CHECK INSTRUMENT CLUSTER CIRCUIT 433 (DG/OG) FOR AN OPEN

Instrument Cluster C237

Measure the resistance between instrument cluster C237 pin 5, circuit 433 (DG/OG), harness side and GEM
C239 pin 9, circuit 433 (DG/OG), harness side.

Is the resistance less than 5 ohms?

Yes
GO to J12.

No
REPAIR the circuit. TEST the system for normal operation.

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J5 MONITOR THE GEM PID DRAJAR WITH THE INSTRUMENT CLUSTER C237 DISCONNECTED

Monitor the GEM PID DRAJAR while toggling the active command AJAR LAMP OFF and ON.

Does the GEM PID DRAJAR indicate ON-B-?

Yes
GO to J6.

No
GO to J12.
J6 CHECK CIRCUIT 433 (DG/OG) FOR SHORT TO POWER

GEM C239

Measure the voltage between GEM C239 pin 9, circuit 433 (DG/OG), harness side and ground.

Is any voltage indicated?

Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to J11.
J7 MONITOR THE CTM PID DRAJAR

Diagnostic Tool

Monitor the CTM PID DRAJAR while toggling the active command AJAR LAMP OFF and ON.

Does the CTM PID DRAJAR indicate OFF---, ON---?

Yes
GO to J8.

No
GO to J11.
J8 CHECK THE INSTRUMENT CLUSTER FOR AN OPEN

Instrument Cluster C237

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Instrument Cluster C236

Measure the resistance between instrument cluster C237 pin 5, component side and C236 pin 11, component
side.

Is the resistance less than 5 ohms?

Yes
GO to J9.

No
GO to J12.
J9 CHECK CIRCUIT 433 (DG/OG) FOR AN OPEN

CTM C239

Measure the resistance between instrument cluster C237 pin 5, circuit 433 (DG/OG), harness side and CTM
C239 pin 9, circuit 433 (DG/OG), harness side.

Is the resistance less than 5 ohms?

Yes
GO to J10.

No
REPAIR the circuit. TEST the system for normal operation.
J10 CHECK CIRCUIT 433 (DG/OG) FOR SHORT TO POWER

Measure the resistance between instrument cluster C237 pin 5, circuit 433 (DG/OG), harness side and ground.

Is any voltage indicated?

Yes
REPAIR the circuit. TEST the system for normal operation.

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No
INSTALL a new CTM. REFER to Section 419-10. CLEAR the DTCs. REPEAT the self-test.
J11 CHECK FOR CORRECT GEM OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new GEM. REFER to Section 419-10. CLEAR the DTCs. REPEAT the GEM self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.
J12 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST K: THE DOOR AJAR INDICATOR DOES NOT OPERATE CORRECTLY (CHIME IS OPERATIVE)

CONDITIONS DETAILS/RESULTS/ACTIONS
K1 CHECK THE VEHICLE OPTION CONTENT

Verify the option content of the vehicle.

Is the vehicle equipped with a GEM?

Yes
GO to K2.

No
GO to K5.
K2 MONITOR THE GEM PID DRAJAR

Diagnostic Tool

Monitor the GEM PID DRAJAR while toggling the active command AJAR LAMP OFF and ON.

Does the GEM PID DRAJAR indicate OFF---, ON---?

Yes
GO to K8.

No
GO to K3.
K3 CHECK THE GEM FOR CONCERN — DISCONNECT GEM C239

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GEM C239

Does the DOOR AJAR indicator stay on continuously?

Yes
GO to K4.

No
GO to K8.
K4 CHECK CIRCUIT 433 (DG/OG) FOR SHORT TO GROUND

Instrument Cluster C237

Measure the resistance between GEM C239 pin 9, circuit 433 (DG/OG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to K8.

No
REPAIR the circuit. TEST the system for normal operation.
K5 MONITOR THE CTM PID DRAJAR

Diagnostic Tool

Monitor the CTM PID DRAJAR while toggling the active command AJAR LAMP OFF and ON.

Does the CTM PID DRAJAR indicate OFF---, ON---?

Yes
GO to K6.

No
GO to K8.
K6 CHECK THE CTM FOR CONCERN — DISCONNECT CTM C239

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CTM C239

Does the DOOR AJAR indicator stay on continuously?

Yes
GO to K7.

No
GO to K8.
K7 CHECK CIRCUIT 433 (DG/OG) FOR SHORT TO GROUND

Instrument Cluster C237

Measure the resistance between CTM C239 pin 9, circuit 433 (DG/OG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to K9.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
K8 CHECK FOR CORRECT GEM OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new GEM. REFER to Section 419-10. CLEAR the DTCs. REPEAT the GEM self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.
K9 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

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No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST L: THE BRAKE WARNING INDICATOR IS NEVER/ALWAYS ON

CONDITIONS DETAILS/RESULTS/ACTIONS
L1 CHECK BASE BRAKE SYSTEM

Check the base brake system.

Is the base brake system OK?

Yes
GO to L2.

No
REFER to Section 206-00.
L2 CHECK THE BRAKE FLUID LEVEL AND PARKING BRAKE

Check the parking brake control and brake fluid level.

Is the parking brake control fully disengaged and the brake fluid level at the correct level?

Yes
GO to L3.

No
DISENGAGE the parking brake control and FILL the brake fluid to the correct level as necessary. CLEAR the
DTCs. REPEAT the self-test.
L3 CHECK PARKING BRAKE SWITCH

Parking Brake Switch C254

Measure the resistance between parking brake switch (component side) and ground while engaging and fully
disengaging the parking brake control.

Is the resistance less than 5 ohms with the parking brake engaged and greater than 10,000 ohms with
the parking brake fully disengaged?

Yes
GO to L4.

No
INSTALL a new parking brake switch. REFER to Section 206-05. CLEAR the DTCs. REPEAT the self-test.
L4 CHECK CIRCUIT 162 (LG/RD)

Instrument Cluster C236

Measure the resistance between instrument cluster C236 pin 17, circuit 162 (LG/RD), harness side and parking
brake switch C254, circuit 162 (LG/RD), harness side; and between instrument cluster C236 pin 17, circuit 162
(LG/RD), harness side and ground.

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Is the resistance less than 5 ohms between the instrument cluster and parking brake switch, and
greater than 10,000 ohms between the instrument cluster and ground?

Yes
GO to L5.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
L5 CHECK BRAKE FLUID LEVEL INDICATOR SWITCH
NOTE: Verify that the brake fluid level is full.

Brake Fluid Level Indicator Switch C162

Measure the resistances between brake fluid level indicator switch pin 1 (component side) and fluid level indicator
switch pin 3 (component side); and between fluid level indicator switch pin 2 (component side) and fluid level
indicator switch pin 3 (component side).

Is the resistance greater than 10,000 ohms between fluid level indicator switch pin 1 and fluid level
indicator switch pin 3, and less than 5 ohms between fluid level indicator switch pin 2 and fluid level
indicator switch pin 3?

Yes
GO to L6.

No
INSTALL a new brake fluid level switch. TEST the system for normal operation.
L6 CHECK CIRCUIT 531 (DG/YE) AND CIRCUIT 512 (TN/LG) FOR SHORT TO GROUND

If equipped with RABS, disconnect the anti-lock brake control module C222.
Measure the resistances between instrument cluster C236 pin 18, circuit 531 (DG/YE), harness side and ground;
and between instrument cluster C236 pin 19, circuit 512 (TN/LG), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to L7.

No
REPAIR circuit 531 (DG/YE) and circuit 512 (TN/LG) as necessary. TEST the system for normal operation.
L7 CHECK CIRCUIT 531 (DG/YE) AND CIRCUIT 512 (TN/LG) FOR AN OPEN

Measure the resistances between instrument cluster C236 pin 18, circuit 531 (DG/YE), harness side and brake
fluid level indicator switch C162 pin 3, circuit 531 (DG/YE), harness side; and between instrument cluster C236
pin 19, circuit 512 (TN/LG), harness side and brake fluid level indicator switch C162 pin 2, circuit 512 (TN/LG),
harness side.

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Are the resistances less than 5 ohms?

Yes
GO to L8.

No
REPAIR the circuit in question. TEST the system for normal operation.
L8 CHECK CIRCUIT 57 (BK) FOR AN OPEN

Measure the resistance between brake fluid level indicator switch C162 pin 1, circuit 57 (BK), harness side and
ground.

Is the resistance less than 5 ohms?

Yes
GO to L9 .

No
REPAIR the circuit. TEST the system for normal operation.
L9 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE

Instrument Cluster C236

Parking Brake Switch C254

Brake Fluid Level Indicator Switch C162

NOTE: The anti-lock brake control module C222 must be disconnected.

Check the red BRAKE warning indicator for illumination.

Does the red BRAKE warning indicator illuminate?

Yes
GO to L10.

No
INSTALL a new anti-lock brake control module. REFER to Section 206-09A. CLEAR the DTCs. REPEAT the self-
test.
L10 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.

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Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST M: THE CHARGE SYSTEM WARNING INDICATOR IS NEVER/ALWAYS ON

CONDITIONS DETAILS/RESULTS/ACTIONS
M1 CHECK CHARGING SYSTEM

Check charging system operation. Refer to Section 414-00.

Is the charging system operating correctly?

Yes
GO to M2.

No
REFER to Section 414-00.
M2 CHECK CHARGE SYSTEM WARNING INDICATOR WITH ENGINE OFF

Observe the charge system warning indicator.

Is the charge system warning indicator on?

Yes
GO to M5.

No
GO to M3.
M3 CHECK THE INSTRUMENT CLUSTER INPUT

Generator C176

Connect a fused jumper wire between generator C176, circuit 904 (LG/RD), harness side and ground.

Does the charge system indicator illuminate?

Yes
INSTALL a new generator. REFER to Section 414-02. CLEAR the DTCs. REPEAT the self-test.

No
GO to M4.
M4 CHECK CIRCUIT 904 (LG/RD) FOR OPEN

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Instrument Cluster C236

Measure the resistance between instrument cluster C236 pin 3, circuit 904 (LG/RD), harness side and generator
C176, circuit 904 (LG/RD), harness side.

Is the resistance less than 5 ohms?

Yes
GO to M7.

No
REPAIR the circuit. TEST the system for normal operation.
M5 CHECK THE GENERATOR

Generator C176

Does the charge system indicator illuminate?

Yes
GO to M6.

No
INSTALL a new generator. REFER to Section 414-02. CLEAR the DTCs. REPEAT the self-test.
M6 CHECK CIRCUIT 904 (LG/RD) FOR SHORT TO GROUND

Measure the resistance between generator C176, circuit 904 (LG/RD), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to M7.

No
REPAIR the circuit. TEST the system for normal operation.
M7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Correct any disconnect connectors.
Make sure all other system connectors are fully seated.

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Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST N: THE 4X4 INDICATOR LAMP IS NEVER/ALWAYS ON

CONDITIONS DETAILS/RESULTS/ACTIONS
N1 CHECK THE IGNITION STATES — MONITOR THE GEM PID IGN_ GEM

Diagnostic Tool

Monitor the GEM PID IGN_S, IGN_R, IGN_O/L, IGN_A, while turning the ignition switch through the START,
RUN, OFF and ACC positions.

Do the GEM PID values agree with the ignition switch positions?

Yes
GO to N2.

No
REPAIR the ignition circuit (RUN/ACC: circuit 297 [BK/LG], RUN: circuit 1040 [RD/LB], START: circuit 32 [RD/LB]
or circuit 481 [GY/YE]) in question. CLEAR the DTCs. REPEAT the self-test.
N2 RETRIEVE THE RECORDED DTC(S) RESULTS FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS — GEM

Use the recorded GEM DTCs from the continuous and on-demand self-tests.

Are any GEM DTCs recorded?

Yes
If DTC P1804, GO to N3 .

If DTC P1806, GO to N3 .

If any other DTC, GO to the GEM Diagnostic Trouble Code (DTC) Index.

No
GO to N3.
N3 CHECK THE INDICATOR

Monitor the GEM PID 4WDHIGH.

Set the GEM active command 4WDHIGH to ON and then OFF. The 4X4 indicator should illuminate, then go off.

Does the 4X4 indicator operate correctly?

Yes
The 4X4 indicator is operating correctly. VERIFY the symptom, GO to the Symptom Chart.

No
If the GEM PID 4WDHIGH indicates ON-B-, GO to N8 .

If the GEM PID 4WDHIGH indicates ONO-G and lamp stays on continuously, GO to N6 .

If the GEM PID 4WDHIGH indicates ONO-G and lamp does not illuminate, GO to N4 .
N4 CHECK THE INPUT TO THE INSTRUMENT CLUSTER FOR AN OPEN

GEM C241

Connect a fused jumper wire GEM C241 pin 9, circuit 210 (LB), harness side and ground.

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Does the 4X4 indicator illuminate?

Yes
GO to N10.

No
GO to N5.
N5 CHECK CIRCUIT 210 (LB) FOR AN OPEN

Instrument Cluster C236

Measure the resistance between instrument cluster C236 pin 4, circuit 210 (LB), harness side and GEM C241 pin
9, circuit 210 (LB), harness side.

Is the resistance less than 5 ohms?

Yes
GO to N11.

No
REPAIR the circuit. TEST the system for normal operation.
N6 CHECK CIRCUIT 210 (LB) FOR SHORT TO GROUND

Instrument Cluster C236

GEM C241

Measure the resistance between instrument cluster C236 pin 4, circuit 210 (LB), harness side and ground.

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Is the resistance greater than 10,000 ohms?

Yes
GO to N7.

No
REPAIR the circuit. TEST the system for normal operation.
N7 CHECK THE GEM

Is the 4X4 indicator still illuminated?

Yes
GO to N11.

No
GO to N10.
N8 CHECK CIRCUIT 210 (LB) FOR SHORT TO POWER

GEM C241

Instrument Cluster C236

Disconnect the anti-lock brake control module C146 (4WABS) or C222 (RABS).

Measure the voltage between GEM C241 pin 9, circuit 210 (LB), harness side and ground.

Is any voltage indicated?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to N9.
N9 CHECK THE GEM FOR SHORT TO POWER

Monitor the GEM PID 4WDHIGH.

Set the GEM active command HIGH LAMP to ON and then OFF.

Does the GEM PID 4WDHIGH indicate ON-B-?

Yes

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GO to N10.

No
GO to N11.
N10 CHECK FOR CORRECT GEM OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new GEM. REFER to Section 419-10. CLEAR the DTCs. REPEAT the GEM self-test.

No
The system is operating correct at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.
N11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect and disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self test.

PINPOINT TEST O: AN INDICATOR IS INOPERATIVE/ALWAYS ON — HIGH BEAM

CONDITIONS DETAILS/RESULTS/ACTIONS
O1 CHECK THE HIGH BEAM LAMP OPERATION

Operate the high beams.

Do the high beams operate correctly?

Yes
GO to O2.

No
REFER to Section 417-01.
O2 CHECK CIRCUIT 932 (GY/WH) FOR AN OPEN

Instrument Cluster C236

Measure the voltage between instrument cluster C236 pin 12, circuit 932 (GY/WH), harness side and ground,
while turning the high beams on and off.

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Is the voltage 0 volts with the high beams off and greater than 10 volts with the high beams on?

Yes
GO to O3.

No
REPAIR the circuit. TEST the system for normal operation.
O3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present..

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST P: AN INDICATOR IS INOPERATIVE/ALWAYS ON — ABS WARNING

CONDITIONS DETAILS/RESULTS/ACTIONS
P1 CHECK THE ABS WARNING INDICATOR

Check the ABS warning indicator in the instrument cluster.

Is the ABS warning indicator always on?

Yes
REFER to Section 206-09A(RABS), or REFER to Section 206-09B (4WABS).

No
GO to P2.
P2 CHECK THE INSTRUMENT CLUSTER INPUT

CAUTION: Use correct probe adapter(s) when making measurements. Failure to use correct probe adapter(s) may damage the connector.

Disconnect the anti-lock brake control module C146 (4WABS) or anti-lock brake control module C222 (RABS).

Does the ABS indicator illuminate?

Yes
GO to P4.

No
GO to P3.
P3 CHECK CIRCUIT 603 (DG) FOR A SHORT TO GROUND

CAUTION: Use correct probe adapter(s) when making measurements. Failure to use correct probe adapter(s) may damage the connector.

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 2001 F-150 Workshop Manual Page 41 of 45

Instrument Cluster C236

Measure the resistance between instrument cluster C236 pin 16, circuit 603 (DG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to P5.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
P4 CHECK FOR CORRECT ANT-LOCK BRAKE CONTROL MODULE OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new anti-lock brace module. REFER to Section 206-09A or REFER to Section 206-09B. CLEAR the
DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.
P5 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect any disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify that concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section.CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST Q: AN INDICATOR IS INOPERATIVE/ALWAYS ON —SERVICE ENGINE SOON

CONDITIONS DETAILS/RESULTS/ACTIONS
Q1 CARRY OUT THE INSTRUMENT CLUSTER SERVICE ENGINE SOON INDICATOR ACTIVE COMMAND USING THE DIAGNOSTIC TOOL

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 2001 F-150 Workshop Manual Page 42 of 45

Diagnostic Tool

Select the instrument cluster INDICATOR LAMP CONTROL active command. Trigger the instrument cluster active command MIL ON.

Is the SERVICE ENGINE SOON indicator illuminated?

Yes
REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to Q2.
Q2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect and disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST R: AN INDICATOR IS INOPERATIVE/ALWAYS ON — TURN/HAZARD

CONDITIONS DETAILS/RESULTS/ACTIONS
R1 CHECK THE TURN SIGNAL AND HAZARD LAMPS OPERATION

Operate the left and right turn signals.

Operate the hazard lamps.

Do the turn signals and hazard lamps operate correctly?

Yes
GO to R2.

No
REFER to Section 417-01.
R2 CHECK THE CIRCUIT IN QUESTION — CIRCUIT 2 (WH/LB) (RH) OR CIRCUIT 3 (LG/WH) (LH)

Disconnect the instrument cluster C236 (RH) or instrument cluster C237 (LH).

Measure the voltage between instrument cluster C236 pin 7, circuit 2 (WH/LB), harness side and ground, while
the multifunction switch is moved to the right turn position (RH); or between instrument cluster C237 pin 4, circuit
3 (LG/WH), and ground, while the multifunction switch is moved to the left turn position (LH).

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 2001 F-150 Workshop Manual Page 43 of 45

Does the voltage fluctuate between 0 volts with the turn signal off and 12 volts with the turn signal on?

Yes
GO to R3.

No
REPAIR circuit in question. TEST the system for normal operation.
R3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect and disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST S: THE SPEED CONTROL INDICATOR IS NEVER ON

CONDITIONS DETAILS/RESULTS/ACTIONS
S1 CHECK SPEED CONTROL OPERATION

Verify the operation of the speed control system. refer to Section 310-03.

Does the speed control system operate OK?

Yes
GO to S2.

No
REFER to Section 310-03.
S2 CHECK CIRCUIT 203 (OG/LB) FOR OPEN BETWEEN INSTRUMENT CLUSTER SPEED CONTROL SERVO

Instrument Cluster C236

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 2001 F-150 Workshop Manual Page 44 of 45

Speed Control Servo C157

Measure the resistance between instrument cluster C236 Pin 14, circuit 203 (OG/LB), harness side and speed
control servo C157 pin 1, circuit 203 (OG/LB), harness side.

Is the resistance less than 5 ohms?

Yes
GO to S3.

No
REPAIR the circuit. TEST the system for normal operation.
S3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect and disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the
HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST T: GAUGE IS INOPERATIVE — BOOST GAUGE

CONDITIONS DETAILS/RESULTS/ACTIONS
T1 CHECK BOOST GAUGE PRESSURE LINE

Disconnect the boost gauge pressure line from the intake manifold.
Apply 10 psi to the boost gauge pressure line.

Does the boost gauge indicate maximum boost pressure?

Yes
CHECK for a plugged manifold fitting. TEST the system for normal operation.

No
GO to T2.
T2 CHECK THE BOOST GAUGE

Disconnect the boost gauge pressure line from the instrument cluster.
Apply 10 psi to the boost gauge.

Does the boost gauge indicate maximum boost pressure?

Yes
INSTALL a new boost gauge pressure line. TEST the system for normal operation.

No
GO to T3.
T3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

Check:

 for corrosion
 for pushed-out pins
 that connector seats correctly
Connect and disconnected connectors.
Make sure all other system connectors are fully seated.
Operate the system and verify the concern is still present.

Is the concern still present?

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Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the HEC self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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