03 Cobra ABS problem

[RAP66]

Re-Posting over here, hopefully someone knows where to check next.

My ABS light has been going on and off for a while now. When the weather is cooler (40-70s) the light is off, after driving a bit ~20min or so the ABS light will go on, ( and more recently the TRAC light will go on). When it's warm 80-90s the light is on when I start the car.

Sometimes the light will be on then for now reason it will turn off and the trac light turns off.

I pulled the seat and tires to check the sensors today. The fronts ohm out at 1.72k, the sensor has a little grime that I cleaned off. Visually nothing obvious. The rears ohm out at 2.6-2.65k, again visually they look fine.

The reservoir level is ~1/4" below the max mark.

I want to clear this issue up before I start adding my upgrades.

Does anyone have any thought as to what might be wrong??

BTW - I've tried 3 different code readers and never got codes.

 

[big dad]

Try this. The next time the ABS light comes on due not turn the ignition off until you've scanned for codes. I don't think the ABS module has a memory, but I may be wrong, in any event try my suggestion and see what happens.

 

[hotcobra03]

Check ring for missing teeth...

what size wheels front and rear..

Have you tried instument cluster test for dtc

have you read manual on abs testing

 

[RAP66]

Thanks guys for the help!

the wheels are stock. When I was checking I didn't see any visible damage to the rings.

I'll review my manual for the code reader, it is possible I missed something.

I have no clue what the instrument cluster test is, I'll see if I can find how to do that.

 

[hotcobra03]

read note on traction control

SECTION 413-01: Instrument Cluster 2003 Mustang Workshop Manual
DIAGNOSIS AND TESTING Procedure revision date: 10/03/2002

--------------------------------------------------------------------------------

Instrument Cluster Printable View (321 KB)
Refer to Wiring Diagrams Cell 60 , Instrument Cluster for schematic and connector information.


Special Tool(s) Worldwide Diagnostic System (WDS)
418-F224,

New Generation STAR (NGS) Tester
418-F052, or equivalent diagnostic tool
Instrument Gauge System Tester
014-R1063 or equivalent
73III Automotive Meter
105-R0057 or equivalent


Principles of Operation

NOTE: A new instrument cluster must be reconfigured. Refer to Section 418-01 .

The instrument cluster is a hybrid electronic cluster (HEC). The instrument cluster uses both hardwired and the standard corporate protocol (SCP) communication network to transmit and receive information. As a technician it is very important to understand:

where the input originates from.
all information necessary in order for a feature to operate.
which module(s) receive(s) the input or command message.
does the module which received the input control the output of the feature, or does it output a message over the SCP network to another module?
which module controls the output of the feature.
The instrument cluster carries out a display prove-out to verify that the warning/indicator miniature bulbs for monitored systems are functioning correctly. When the ignition switch is in the ON position with the engine off, the following warning indicators will prove out:

anti-lock brake (ABS) warning indicator
air bag warning indicator
BRAKE warning indicator
charging system indicator
fail safe cooling warning indicator
low coolant level indicator
low fuel warning indicator
traction control indicator
Instrument Cluster Replacement

When it is necessary to install a new instrument cluster, contact the Instrument Cluster Program.

Gauge Indication Systems

Tachometer
Engine rpm information is relayed to the instrument cluster from the powertrain control module (PCM) over the standard corporate protocol (SCP) network.

Speedometer
The instrument cluster receives the vehicle speed signal from the 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).

Odometer
The instrument cluster receives an odometer message from the PCM and stores the mileage in memory. When the instrument cluster fails to receive the odometer message for more than two seconds, the odometer will display dashes.

Fuel Gauge
The fuel sender is hardwired to the fuel gauge. When the instrument cluster fails to receive the fuel level signal for more than 33 seconds, the fuel level gauge will move below E (empty). If the fuel level signal operates correctly for more than 33 seconds, the fuel gauge will return to the correct position.

Fuel fills of less than 9.5 liters (2.5 gallons) require at least 10 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. Engine coolant temperatures above 121°C (250°F) will cause the gauge to indicate above the normal band. If the engine coolant temperature information is missing or invalid for five seconds, the temperature gauge will indicate below the cold (C) position.

Voltage Gauge (except Cobra)
The voltage gauge displays the system voltage as measured at the instrument cluster run input.

Boost Gauge (Cobra only)
The boost pressure gauge on the instrument cluster receives and measures the boost pressure directly from the intake manifold. The boost pressure gauge will display between 0.0-0.48 kpa (0.0-10 psi) boost pressure dependent upon accelerator position, engine load, and engine rpm.

LOW FUEL Level Indicator
The low fuel level indicator is hardwired from the fuel sender to the instrument cluster. The instrument cluster will illuminate the low fuel indicator when the usable fuel quantity is less than 1/8 tank (15%) of fuel tank capacity.

Oil Pressure Gauge
The oil pressure gauge is hardwired from the oil pressure switch to the instrument cluster. The oil pressure gauge will indicate either normal or no oil pressure.

CHECK FUEL CAP
The CHECK FUEL CAP indicator is used to indicate significant leaks in the fuel tank evaporative system due to a loose fuel cap. Fuel tank pressure is monitored by the PCM. If a leak is detected the PCM signals a fault to the instrument cluster via the SCP network. Once the PCM has detected a loose fuel cap and the CHECK FUEL CAP indicator is illuminated, the indicator will remain illuminated until the fuel cap is secured and the vehicle has been running for several minutes. For additional information, refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

BRAKE Warning Indicator
The BRAKE warning indicator activates when the generic electronic module (GEM) detects the ignition switch circuits are in the RUN state, when the GEM detects low brake fluid level, or that the parking brake is applied. The BRAKE warning indicator will prove out starting when the GEM detects that the ignition circuits have made a transition to RUN or START from OFF, ACC, or keyout and ending when either three seconds have elapsed or when the GEM detects the ignition circuits have made a transition to OFF, ACC, or keyout.

Safety Belt Warning Indicator
The safety belt switch is hardwired to the GEM. The safety belt warning indicator will be illuminated when the GEM sends a ground signal to the instrument cluster.

ABS Warning Indicator
The ABS warning indicator will be illuminated when the anti-lock brake control module sends a ground 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
The SERVICE ENGINE SOON indicator receives its signal from the PCM over the SCP network. If the instrument cluster does not receive a message from the PCM within five seconds, 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 steering column multifunction switch is in the high beam position by sending a battery signal to the instrument cluster.

Right and Left Turn Indicator
The right and left turn indicators will illuminate when the steering column multifunction switch is in either turn signal position or hazard lamps position by sending a battery signal to the instrument cluster.

AIR BAG Warning Indicator
The AIR BAG warning 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 warning indicator is controlled by the RCM.

THEFT Indicator
The THEFT indicator provides a 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 an ignition switch OFF transition to indicate that PATS is active.

Charging System Indicator
The charging system indicator will be illuminated when the generator provides a ground signal to the instrument cluster. The instrument cluster provides a prove-out when the ignition switch is in the RUN position with the engine off. When the engine is started, the generator removes the ground to the instrument cluster and extinguishes the charging system indicator.

Overdrive Off (O/D OFF) Indicator
The O/D OFF indicator is controlled by the off/on message sent from the PCM over the SCP network. The instrument cluster does not provide a prove-out for the O/D OFF indicator, but will remain illuminated if the overdrive has been commanded off following the instrument cluster prove-out.

Traction Control Indicator
During initialization, the instrument cluster will receive the traction control system state status message from the traction control module to determine if the vehicle is equipped with traction control. If the vehicle is equipped with traction control, this information will be stored in random access memory (RAM) and the indicator will prove out for three seconds during each ignition cycle. If this message is not received, the instrument cluster will assume that the vehicle is not traction control equipped and the indicator will remain off. When the traction control is active, the traction control module sends the instrument cluster a traction control active signal and the instrument cluster illuminates the traction control indicator. When the traction control is inactive, the traction control module removes the traction control active signal and the instrument cluster turns off the indicator.

In the event of a traction control failure, the traction control indicator will remain off and the ABS indicator will illuminate.

Inspection and Verification

Verify the customer concern.
Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
Fuel tank
Engine coolant level
Accessory drive belt
Engine oil level
Parking brake position switch
Brake fluid level
Boost gauge pressure line
Central junction box (CJB) fuse(s):
5 (15A)
7 (15A)
11 (15A)
13 (15A)
21 (5A)
23 (15A)
24 (30A)
29 (15A)
30 (15A)
32 (15A)
34 (20A)
35 (15A)
37 (5A)
38 (20A)
39 (5A)
Circuitry



If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
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.
If the diagnostic tool still does not power up, refer to the diagnostic tool operating manual.
Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with:
CKT914, CKT915 OR CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00 .
NO RESP/NOT EQUIP for the instrument cluster, Go To Pinpoint Test A or for the generic electronic module (GEM), Go To Pinpoint Test W .
SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the instrument cluster or the GEM.
If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index or the GEM Diagnostic Trouble Code Index to continue diagnostics.
If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.

Instrument Cluster Self-Diagnostic Mode

To enter the instrument cluster self-diagnostic mode, press and hold the instrument cluster SELECT/RESET button, turn the ignition switch to the RUN position, and then 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 tESt display to begin the self-diagnostic mode. Press the SELECT/RESET button to advance through the following steps until dtc is displayed. Depressing the SELECT/RESET button will display any stored continuous DTCs 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 illuminated Illuminates all odometer segments.
bulb Illuminates all micro-controlled indicators and LEDs. Install a new indicator or LED as necessary.
r Returns to normal operation of all micro-controlled indicators 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 in hexadecimal format. 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 metric speed data (km/h). 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 within tolerances. Tachometer will indicate present rpm. 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 code (0-255) for the fuel sender input to the instrument cluster. The fuel gauge will display a filtered fuel level value. This filter will keep the pointer from moving suddenly or erratically.
255 = open send +/- 0
232 = full stop +/- 0
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 (0-250) for the oil pressure switch input to the instrument cluster. 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 or an inoperative engine oil pressure switch (less than 6 psi) will display a value greater than 176.
dEGC Display of engine temperature in degrees C input from cylinder head temperature sensor.
49 C = "C" mark
60 C = normal band start
120 C = normal band end
-40 C = no SCP message for 5 seconds

bAtt Displays the code (0-255) for the battery voltage input to the instrument cluster. Battery voltage gauge will indicate present battery voltage.
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 decimal rheostat dimming input, 0-255 (used when requesting assistance from the hotline).
rhi
rhS
rho Not used.
Cr Displays the present RUN/START sense input. Display will show -h for high input with the ignition switch in the START position and -L for low input with the ignition switch in the RUN position.
PA-PE7 Not used.
GAGE Repeats test display cycle.


To exit the instrument cluster self-diagnostic mode, turn the ignition switch to the OFF position or press and hold the SELECT/RESET button for three or more seconds and release.



Instrument Cluster Diagnostic Trouble Code (DTC) Index Diagnostic Tool Displayed DTC Self-Diagnostic Mode Displayed DTC Description Source Action
B1202 9202 Fuel Sender Open Circuit Instrument Cluster Go To Pinpoint Test B .
B1204 9204 Fuel Sender Short to Ground Instrument Cluster Go To Pinpoint Test B .
B1317 9317 Battery Voltage High Instrument Cluster Section 414-00 .
B1318 9318 Battery Voltage Low Instrument Cluster Section 414-00 .
B1342 9342 ECU is Defective Instrument Cluster INSTALL a new instrument cluster; REFER to Instrument Cluster in this section. TEST the system for normal operation.
B1343 9343 Heated Backlight Input Circuit Failure Instrument Cluster Section 501-11 .
B1356 9356 Ignition Run Circuit Open Instrument Cluster Go To Pinpoint Test A .
B1364 9364 Ignition Start Circuit Open Instrument Cluster Go To Pinpoint Test A .
B2143 A143 Odometer NVM Mmory Failure Instrument Cluster Go To Pinpoint Test J .
C1284 5284 Oil Pressure Switch Failure Instrument Cluster Go To Pinpoint Test C .
P1197 1197 Mileage Switch Circuit Failure Instrument Cluster Go To Pinpoint Test J .



GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action
B1218 Horn Relay Coil Circuit Short to VBatt GEM REFER to Section 501-14B .
B1312 Lamp Headlamp Input Circuit Short to Battery GEM REFER to Section 413-09 .
B1317 Battery Voltage High GEM REFER to Section 414-00 .
B1318 Battery Voltage Low GEM REFER to Section 414-00 .
B1322 Driver Door Ajar Circuit Short to Ground GEM REFER to Section 417-02 .
B1330 Passenger Door Ajar Circuit Short to Ground GEM REFER to Section 417-02 .
B1334 Decklid Ajar Rear Door Circuit Short to Ground GEM REFER to Section 417-02 .
B1339 Chime Input Request Circuit Short to Battery GEM REFER to Section 413-09 .
B1340 Chime Input Request Circuit Short to Ground GEM REFER to Section 413-09 .
B1342 ECU is Defective GEM Clear the DTCs. Retrieve the DTCs. If DTC B1342 is retrieved, INSTALL a new GEM. REFER to Section 419-10 .
B1353 Ignition Key-In Circuit Open GEM REFER to Section 413-09 .
B1359 Ignition Run/Acc Circuit Failure GEM REFER to Section 211-05 .
B1396 Power Door Lock Circuit Short to Battery GEM REFER to Section 501-14B .
B1397 Power Door Unlock Circuit Short to Battery GEM REFER to Section 501-14B .
B1405 Driver Power Window Down Circuit Short to Battery GEM REFER to Section 501-11 .
B1408 Driver Power Window Up Circuit Short to Battery GEM REFER to Section 501-11 .
B1426 Lamp Safety Belt Circuit Short to Battery GEM Go To Pinpoint Test K .
B1428 Lamp Safety Belt Circuit Failure GEM Go To Pinpoint Test K .
B1431 Wiper Brake/Run Relay Circuit Failure GEM REFER to Section 501-16 .
B1432 Wiper Brake/Run Relay Circuit Short to Battery GEM REFER to Section 501-16 .
B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure GEM REFER to Section 501-16 .
B1436 Wiper Hi/Low Speed Relay Coil Circuit Short to Battery GEM REFER to Section 501-16 .
B1438 Wiper Mode Select Switch Circuit Failure GEM REFER to Section 501-16 .
B1441 Wiper Mode Select Switch Circuit Short to Ground GEM REFER to Section 501-16 .
B1446 Wiper Park Sense Circuit Failure GEM REFER to Section 501-16 .
B1448 Wiper Park Sense Circuit Short to Battery GEM REFER to Section 501-16 .
B1450 Wiper Wash/Delay Switch Circuit Failure GEM REFER to Section 501-16 .
B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM REFER to Section 501-16 .
B1458 Wiper Washer Pump Motor Relay Circuit Failure GEM REFER to Section 501-16 .
B1460 Wiper Washer Pump Motor Relay Coil Circuit Short to Battery GEM REFER to Section 501-16 .
B1462 Safety Belt Switch Circuit Failure GEM REFER to Section 413-09 .
B1466 Wiper Hi/Low Speed Not Switching GEM REFER to Section 501-16 .
B1473 Wiper Low Speed Circuit Motor Failure GEM REFER to Section 501-16 .
B1476 Wiper High Speed Circuit Motor Failure GEM REFER to Section 501-16 .
B1551 Decklid Release Circuit Failure GEM REFER to Section 501-14B .
B1553 Decklid Release Circuit Short to Battery GEM REFER to Section 501-14B .
B1555 Ignition Run/Start Circuit Failure GEM REFER to Section 211-05 .
B1687 Lamp Dome Input Circuit Short to Battery GEM REFER to Section 417-02 .
B2486 Parklamp Output Relay Driver Circuit Failure GEM REFER to Section 419-01 .
B2488 Parklamp Output Relay Driver Short to Battery GEM REFER to
C1189 Brake Fluid Level Sensor Input Short Circuit to Ground GEM Go To Pinpoint Test O .
C1223 Lamp Brake Warning Output Circuit Failure GEM Go To Pinpoint Test O .
C1225 Lamp Brake Warning Output Circuit Short to Battery GEM Go To Pinpoint Test O .



Symptom Chart

Symptom Chart Condition Possible Sources Action
No communication with the generic electronic module (GEM)
Central junction box (CJB) fuse(s):
7 (15A).
39 (5A).
43 (20A).
Battery junction box (BJB) fuse 12 (40A).
Circuitry.
GEM.
Go To Pinpoint Test W

No communication with the instrument cluster
Central junction box (CJB) fuse(s):
11 (15A).
21 (5A).
34 (20A).
Circuitry.
Standard corporate protocol (SCP) network.
Instrument cluster.
Go To Pinpoint Test A .

Incorrect fuel gauge indication
Circuitry.
Fuel pump module.
Instrument cluster.
Go To Pinpoint Test B .

Incorrect oil pressure gauge indication
Circuitry.
Engine oil pressure switch.
Instrument cluster.
Go To Pinpoint Test C .

Incorrect temperature gauge indication
Circuitry.
Engine coolant temperature sensor.
Powertrain control module (PCM).
Instrument cluster.
Go To Pinpoint Test D .

Incorrect voltage gauge indication—except Cobra
Circuitry.
Generator.
Standard corporate protocol (SCP) network.
Instrument cluster.
Go To Pinpoint Test E .

Incorrect tachometer indication
Standard corporate protocol (SCP) network.
Powertrain control module (PCM).
Instrument cluster.
Go To Pinpoint Test F .

Incorrect boost gauge indication—Cobra only
Pressure line.
Instrument cluster.
Go To Pinpoint Test G .

The LOW FUEL warning indicator is never/always on
LOW FUEL warning indicator bulb.
Standard corporate protocol (SCP) network.
Instrument cluster.
Go To Pinpoint Test H .

Oil gauge reads normal with engine off
Instrument cluster.
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. TEST the system for normal operation.

The speedometer is inoperative
Standard corporate protocol (SCP) network.
Powertrain control module (PCM).
Instrument cluster.
Go To Pinpoint Test I .

The odometer is inoperative
Circuitry.
Powertrain control module (PCM).
Instrument cluster.
Go To Pinpoint Test J .

The safety belt warning indicator is inoperative (chime is operative)/does not operate correctly
Circuitry.
Generic electronic module (GEM).
Instrument cluster.
Go To Pinpoint Test K .

Inaccurate speedometer reading
Instrument cluster.
Powertrain control module (PCM).
Go To Pinpoint Test L .

The O/D OFF indicator is never on
Circuitry.
O/D cancel switch.
O/D OFF indicator bulb.
Standard corporate protocol (SCP) network.
Powertrain control module (PCM).
Instrument cluster.
Go To Pinpoint Test M .

The O/D OFF indicator is always on
Circuitry.
O/D cancel switch.
Powertrain control module (PCM).
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

The CHECK FUEL CAP INDICATOR is never on
Circuitry.
Standard corporate protocol (SCP) network.
Powertrain control module (PCM).
Go To Pinpoint Test N .

The CHECK FUEL CAP INDICATOR is always on
Circuitry.
Powertrain control module (PCM).
Fuel system.
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

The BRAKE warning indicator is never/always on
Circuitry.
Low brake fluid level.
Brake fluid level switch.
Parking brake switch.
Instrument cluster.
Generic electronic module (GEM).
Go To Pinpoint Test O .

The charging system warning indicator is never/always on
Circuitry.
Generator.
Charging system warning indicator bulb.
Instrument cluster.
Go To Pinpoint Test P .

The high beam indicator is never/always on
Circuitry.
High beam indicator bulb.
Instrument cluster.
Go To Pinpoint Test Q .

The air bag warning indicator is never/always on
Circuitry.
Air bag warning indicator bulb.
Instrument cluster.
Restraint control module (RCM).
REFER to Section 501-20B .

The anti-lock brake system (ABS) warning indicator is never on
Circuitry.
ABS warning indicator bulb.
Anti-lock brake control module.
Instrument cluster.
Go To Pinpoint Test R .

The ABS warning indicator is always on
Circuitry.
Anti-lock brake control module.
REFER to Section 206-09A or Section 206-09B .

The SERVICE ENGINE SOON indicator is never/always on
Circuitry.
SERVICE ENGINE SOON indicator bulb.
Powertrain control module (PCM).
Instrument cluster.
Go To Pinpoint Test S .

The turn/hazard indicator is never/always on
Circuitry.
Turn/hazard bulb(s).
Instrument cluster.
Go To Pinpoint Test T .

The THEFT indicator is never/always on
Circuitry.
THEFT indicator LED.
Instrument cluster.
REFER to Section 419-01 .

The traction control indicator is never/always on
Circuitry.
Traction control switch.
Standard corporate protocol (SCP) network.
Powertrain control module (PCM).
ABS module.
Instrument cluster.
Go To Pinpoint Test U .

The integrated circuit display is inoperative/erratic
Instrument cluster.
Go To Pinpoint Test V .

The instrument cluster is inoperative
Central junction box (CJB) fuse(s):
11 (15A).
21 (5A).
34 (20A).
Circuitry.
Instrument cluster.
Go To Pinpoint Test V .



Pinpoint Tests


PINPOINT TEST A: NO COMMUNICATION WITH THE INSTRUMENT CLUSTER
Test Step Result / Action to Take
A1 CHECK THE BATTERY POWER SUPPLY TO THE INSTRUMENT CLUSTER
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Measure voltage between the instrument cluster C220b pin 10, circuit 729 (RD/WH), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to A2 .

No
REPAIR the circuit. TEST the system for normal operation.
A2 CHECK THE RUN POWER SUPPLY TO THE INSTRUMENT CLUSTER
Key in ON position.
Measure the voltage between the instrument cluster C220b pin 11, circuit 489 (PK/BK), 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 THE RUN/START POWER SUPPLY TO THE INSTRUMENT CLUSTER
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the instrument cluster C220b pin 12, circuit 20 (WH/LB), 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 GROUND CIRCUIT 397 (BK/WH) FOR AN OPEN
Key in OFF position.
Measure the resistance between the instrument cluster C220b pin 20, circuit 397 (BK/WH), 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 GROUND CIRCUIT 1205 (BK) FOR OPEN
Measure the resistance between the instrument cluster C220b pin 1, circuit 1205 (BK), 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 B: INCORRECT FUEL GAUGE INDICATION
Test Step Result / Action to Take
B1 CARRY OUT THE INSTRUMENT CLUSTER FUEL GAUGE ACTIVE COMMAND
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. NOTE: Fuel fills of less than 9.5 liters (2.5 gallons) require at least 10 minutes to update the fuel gauge indication.
Key in ON position.
Select the instrument cluster FUELLEVEL active command. Trigger, monitor, and scroll FUELLEVEL at: 0% , 50%, and 100%.
Does the fuel gauge display: below E at 0%, half at 50%, and F at 100%?
Yes
GO to B2 .

No
GO to B8 .
B2 CHECK THE FUEL GAUGE OPERATION
Key in OFF position.
Disconnect: Fuel Pump Assembly C463.
Connect one lead of the Instrument Gauge System Tester to the fuel pump module C463 pin 5, circuit 29 (YE/WH), harness side and the other lead of the Instrument Gauge System Tester to the fuel pump module C463 pin 8, circuit 327 (BK/OG), harness side.

Set the Instrument Gauge System Tester to 160 ohms.
Key in ON position.
Turn the ignition switch to RUN for one second.
Key in OFF position.
Set Instrument Gauge System Tester to 15 ohms.
Key in ON position.
NOTE: The fuel gauge should read E or below when carrying out this test step.
Wait one minute and read the fuel gauge.
Key in OFF position.
Set Instrument Gauge System Tester to 160 ohms.
Key in ON position.
NOTE: The fuel gauge should read F (full) or above when carrying out this test step.
Wait one minute and read the fuel gauge.
Key in OFF position.
Does the fuel gauge operate correctly?
Yes
GO to B3 .

No
GO to B5 .
B3 CHECK THE FUEL TANK
Check the fuel tank for any damage or deformation.
Is the fuel tank OK?
Yes
GO to B4 .

No
INSTALL a new fuel tank; REFER to Section 310-01 . TEST the system for normal operation.
B4 CHECK THE FUEL PUMP ASSEMBLY
Check the fuel pump assembly in-tank mounting, float, float rod, wiring and connections for damage or obstruction.
Is the fuel pump assembly and wiring OK?
Yes
INSTALL a new fuel sender. TEST the system for normal operation.

No
REPAIR as necessary. TEST the system for normal operation.
B5 CHECK CIRCUIT 29 (YE/WH) FOR SHORT TO POWER
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the instrument cluster C220b pin 19, circuit 29 (YE/WH), harness side and ground.

Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to B6 .
B6 CHECK THE FUEL PUMP ASSEMBLY FEED CIRCUIT 29 (YE/WH)
Key in OFF position.
Measure the resistances between the instrument cluster C220b pin 19, circuit 29 (YE/WH), harness side and the fuel pump module C463 pin 5, circuit 29 (YE/WH), harness side; and between the instrument cluster C220b pin 19, circuit 29 (YE/WH), harness side and ground.

Is the resistance less than 5 ohms between the instrument cluster and the fuel pump module and greater than 10,000 ohms between the instrument cluster and ground?
Yes
GO to B7 .

No
REPAIR the circuit. TEST the system for normal operation.
B7 CHECK FUEL PUMP MODULE GROUND CIRCUIT 327 (BK/OG) AND CIRCUIT 397 (BK/WH)
Measure the resistance between the instrument cluster C220b pin 20, circuit 397 (BK/WH), harness side and the fuel pump module C463 pin 8, circuit 327 (BK/OG), harness side.

Is the resistance less than 5 ohms?
Yes
GO to B8 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation.
B8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 C: INCORRECT OIL PRESSURE GAUGE INDICATION
Test Step Result / Action to Take
C1 CHECK THE INSTRUMENT CLUSTER OPERATION
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Trigger the instrument cluster active command OIL GAUGE. Scroll to 0%, 50%, and 100%.
Did the gauge display L at 0%, the middle of the gauge at 50%, and H at 100%?
Yes
GO to C2 .

No
GO to C3 .
C2 CHECK CIRCUIT 31 (WH/RD) FOR OPEN OR SHORT TO GROUND
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Disconnect: Oil Pressure Switch C103.
Measure the resistances between the instrument cluster C220b pin 16, circuit 31 (WH/RD), harness side and the oil pressure switch C103, circuit 31 (WH/RD), harness side; and between the instrument cluster C220b pin 16, circuit 31 (WH/RD), harness side and ground.

Is the resistance less than 5 ohms between the instrument cluster and the oil pressure switch, and greater than 10,000 ohms between the instrument cluster and ground?
Yes
INSTALL a new oil pressure switch. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.
C3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: INCORRECT TEMPERATURE GAUGE INDICATION
Test Step Result / Action to Take
D1 CARRY OUT THE INSTRUMENT CLUSTER ENGINE COOLANT TEMPERATURE GAUGE ACTIVE COMMAND
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
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 D2 .
D2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 E: INCORRECT VOLTAGE GAUGE INDICATION—EXCEPT COBRA
Test Step Result / Action to Take
E1 CHECK THE INSTRUMENT CLUSTER
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Trigger the instrument cluster voltage gauge active command. Scroll to 0%, 50%, and 100%.
Did the voltage gauge indicate L at 0%, the middle of the gauge at 50%, and H at 100%?
Yes
GO to E2 .

No
GO to E4 .
E2 CHECK CHARGING SYSTEM
Check the charging system operation. REFER to Section 414-00 .
Is the charging system operating correctly?
Yes
GO to E3 .

No
REPAIR the charging system as needed. REFER to Section 414-00 .
E3 CHECK CIRCUIT 904 (LG/RD) FOR OPEN OR SHORT TO GROUND
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Disconnect: Generator C102a.
Measure resistance between the generator C102a pin 1, circuit 904 (LG/RD), harness side and the instrument cluster C220a pin 5, circuit 904 (LG/RD), harness side; and between the generator C102a pin 1, circuit 904 (LG/RD), harness side and ground.

Is the resistance less than 5 ohms between the generator and the instrument cluster; and greater than 10,000 ohms between the generator and ground?
Yes
The system is operating correctly at this time.

No
REPAIR the circuit. TEST the system for normal operation.
E4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 F: INCORRECT TACHOMETER INDICATION
Test Step Result / Action to Take
F1 CHECK THE TACHOMETER OPERATION
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Trigger the instrument cluster active command TCHOMETER. Scroll to 0%, 50%, and 100%.
Did the tachometer display read 0 at 0%, half the tachometer display at 50%, and the full tachometer display at 100%?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to F2 .
F2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 G: INCORRECT BOOST GAUGE INDICATION—COBRA ONLY
Test Step Result / Action to Take
G1 CHECK BOOST GAUGE PRESSURE LINE
Disconnect the boost gauge pressure line from the intake manifold.
Apply 69 kPa (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 G2 .
G2 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
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. TEST the system for normal operation.

PINPOINT TEST H: THE LOW FUEL WARNING INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
H1 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
Key in OFF position.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Select the instrument cluster WARNING LAMPS AND CHIME active command. Trigger the ALL LAMPS active command. Observe the LOW FUEL warning indicator.
Is the LOW FUEL warning indicator illuminating?
Yes
GO to H2 .

No
GO to H3 .
H2 THE LOW FUEL GAUGE WARNING INDICATOR IS NEVER/ALWAYS ON
Check the fuel gauge for correct operation.
Is the fuel gauge operating correctly?
Yes
GO to H3 .

No
Go To Pinpoint Test B .
H3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 SPEEDOMETER IS INOPERATIVE
Test Step Result / Action to Take
I1 TEST THE INSTRUMENT CLUSTER
Carry out the instrument cluster self-diagnostic mode.
Did the gauge sweep?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to I2 .
I2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 ODOMETER IS INOPERATIVE
Test Step Result / Action to Take
J1 CHECK THE ODOMETER DISPLAY
Key in ON position.
Is the odometer displaying all dashes?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to J2 .
J2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 SAFETY BELT INDICATOR IS INOPERATIVE (CHIME IS OPERATIVE)/DOES NOT OPERATE CORRECTLY
Test Step Result / Action to Take
K1 CHECK IF THE GEM IS RECEIVING THE CORRECT IGNITION SWITCH STATUS
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Generic Electronic Module (GEM) PID.
Monitor the GEM PIDs IGN_KEY, IGN_S, IGN_R, and IGN_A, while inserting the ignition key and cycling the ignition switch through all the positions.
Did the PIDs agree with the ignition switch positions?
Yes
GO to K2 .

No
REFER to Section 211-05 .
K2 CHECK IF THE GEM IS RECEIVING THE CORRECT SAFETY BELT SWITCH STATUS
Monitor GEM PID D_SBELT while buckling and unbuckling the driver safety belt.
Did the PID display IN with the safety belt buckled and OUT with the safety belt unbuckled?
Yes
GO to K3 .

No
REFER to Section 413-09 .
K3 CHECK THE GEM FOR INTERNAL OPEN OR SHORT
Key in OFF position.
Monitor the safety belt warning indicator when turning the ignition from the OFF to the ON position.
Key in ON position.
Did the safety belt warning indicator illuminate for approximately three seconds and turn off?
Yes
GO to K10 .

No
GO to K4 .
K4 DETERMINE IF SAFETY BELT INDICATOR CIRCUIT IS SHORTED TO GROUND
Buckle the driver safety belt.
Is the safety belt indicator always on?
Yes
GO to K5 .

No
GO to K7 .
K5 CHECK IF THE GEM IS INTERNALLY GROUNDED
Key in OFF position.
Disconnect: GEM C201e.
Key in ON position.
Observe the safety belt warning indicator.
Is the safety belt warning indicator always on?
Yes
GO to K6 .

No
GO to K10 .
K6 CHECK CIRCUIT 450 (DG/LG) FOR A SHORT TO GROUND
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Measure the resistance between the GEM C201e pin 26, circuit 450 (DG/LG), harness side and ground.

Is the resistance greater than 10,000 ohms?
Yes
GO to K11 .

No
REPAIR the circuit. TEST the system for normal operation.
K7 CHECK CIRCUIT 450 (DG/LG) FOR A SHORT TO BATTERY
Key in OFF position.
Disconnect: GEM C201e.
Disconnect: Instrument Cluster C220a.
Measure the voltage between the GEM C201e pin 26, circuit 450 (DG/LG), harness side and ground.

Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to K8 .
K8 CHECK THE GEM MODULE FOR AN INTERNAL OPEN
Connect: Instrument Cluster C220a.
Install a fused (10A) jumper wire between the GEM C201e pin 26, circuit 450 (DG/LG), harness side and ground.

Key in ON position.
Did the safety belt indicator illuminate?
Yes
GO to K10 .

No
GO to K9 .
K9 CHECK CIRCUIT 450 (DG/LG) FOR AN OPEN
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Measure the resistance between the GEM C201e pin 26, circuit 450 (DG/LG), harness side and instrument cluster C220a pin 4, circuit 450 (DG/LG), harness side.

Is the resistance less than 5 ohms?
Yes
GO to K11 .

No
REPAIR the circuit. TEST the system for normal operation.
K10 CHECK FOR CORRECT GEM OPERATION
Disconnect all GEM connectors.
Check for:
corrosion
pushed-out pins
Connect all GEM connectors and make sure they seat correctly.
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 . TEST the system for normal operation.

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.
K11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: INACCURATE SPEEDOMETER READING
Test Step Result / Action to Take
L1 CHECK SPEEDOMETER OPERATION
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instument Cluster Active Command.
Trigger the instrument cluster active command SPDOMETER. Scroll to 0%, 50%, and 100%.
Did the speedometer display read 0 at 0%, half the speedometer display at 50%, and the full speedometer display at 100%?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to L2 .
L2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 O/D OFF INDICATOR IS NEVER ON
Test Step Result / Action to Take
M1 CHECK THE O/D OFF INDICATOR OPERATION
Key in ON position.
Observe the O/D OFF indicator.
Is the O/D OFF indicator always on?
Yes
GO to M2 .

No
GO to M3 .
M2 CHECK THE INSTRUMENT CLUSTER
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Key in ON position.
Observe the O/D OFF indicator.
Did the indicator turn off?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to M4 .
M3 CHECK THE INSTRUMENT CLUSTER OPERATION
Carry out the instrument cluster self-diagnostic mode.
Did the O/D OFF indicator illuminate?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to M4 .
M4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 CHECK FUEL CAP INDICATOR IS NEVER ON
Test Step Result / Action to Take
N1 RETREIVE AND RECORD DTCS FROM CONTINUOUS AND ON-DEMAND SELF-TESTS—PCM
NOTE: Once the check fuel cap indicator does turn on, it does not turn off unless the fuel cap has been correctly secured and the vehicle has been driven for several minutes.
Use recorded PCM DTCs from the continuous and on-demand self-test.
Are any DTCs recorded?
Yes
If PCM DTC P0457, REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to N2 .
N2 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL III ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Select the instrument cluster INDICATOR LAMP CONTROL III active command. Trigger the CHECK FUEL CAP active command ON. Observe the CHECK FUEL CAP indicator.
Does the CHECK FUEL CAP indicator illuminate?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to N3 .
N3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: THE BRAKE WARNING INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
O1 CHECK IF THE GEM IS RECEIVING THE CORRECT IGNITION SWITCH STATUS
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Generic Electronic Module (GEM) PID.
Monitor GEM PIDs IGN_KEY, IGN_S, IGN_R, and IGN_A while cycling the ignition switch through all positions and then removing the key from ignition switch.
Do the PIDs agree with the ignition switch status?
Yes
GO to O2 .

No
REFER to Section 211-05 .
O2 DETERMINE IF GEM IS RECEIVING THE CORRECT PARKING BRAKE INPUT
Monitor GEM PID PRK_BRK while applying and releasing the parking brake.
Did the PID read ON with the parking brake applied, and OFF with the parking brake released?
Yes
GO to O3 .

No
GO to O5 .
O3 DETERMINE IF BRAKE WARNING INDICATOR CIRCUIT IS OPEN OR GROUNDED
Verify that the parking brake is released.
Is the instrument cluster BRAKE warning indicator off?
Yes
GO to O4 .

No
GO to O11 .
O4 DETERMINE IF GEM IS SENDING THE CORRECT OUTPUT SIGNAL
Trigger the GEM active command BKFLD LOW.
Did the instrument cluster BRAKE warning indicator illuminate?
Yes
GO to O14 .

No
GO to O9 .
O5 CHECK CIRCUIT BETWEEN THE PARKING BRAKE SWITCH AND THE GEM FOR A SHORT TO GROUND
Monitor PID PRK_BRK while applying and releasing the parking brake.
Did the PID read ON with the parking brake applied and with the parking brake released?
Yes
GO to O8 .

No
GO to O6 .
O6 CHECK CIRCUIT 128 (VT/YE) AND CIRCUIT 22 (LB/BK) FOR AN OPEN
Key in OFF position.
Disconnect: Parking Brake Switch C306.
Disconnect: GEM C201d.
Measure the resistance between the GEM C201d pin 4, circuit 128 (VT/YE), harness side and the parking brake switch C306 pin 1, circuit 22 (LB/BK), harness side.

Is the resistance less than 5 ohms?
Yes
GO to O7 .

No
REPAIR the circuit. TEST the system for normal operation.
O7 CHECK CIRCUIT 1205 (BK) FOR OPEN
Measure the resistance between the parking brake switch C306 pin 2, circuit 1205 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new parking brake switch. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.
O8 CHECK CIRCUIT 128 (VT/YE) FOR A SHORT TO GROUND
Key in OFF position.
Disconnect: Parking Brake Switch C306.
Disconnect: GEM C201d.
Measure the resistance between the GEM C201d pin 4, circuit 128 (VT/YE), harness side and ground.

Is the resistance greater than 10,000 ohms?
Yes
REPAIR or INSTALL a new parking brake switch as needed. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.
O9 CHECK CIRCUIT 128 (VT/YE) FOR SHORT TO BATTERY
Key in OFF position.
Disconnect: GEM C201e.
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the GEM C201e pin 13, circuit 128 (VT/YE), harness side and ground.

Is any voltage indicated?
Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to O10 .
O10 CHECK CIRCUIT 128 (VT/YE) FOR AN OPEN
Key in OFF position.
Measure the resistance between the GEM C201e pin 13, circuit 128 (VT/YE), harness side and the instrument cluster C220b pin 14, circuit 128 (VT/YE), harness side.

Is the resistance less than 5 ohms?
Yes
GO to O15 .

No
REPAIR the circuit. TEST the system for normal operation.
O11 CHECK THE BRAKE FLUID LEVEL SWITCH FOR AN INTERNAL GROUND
Key in OFF position.
Disconnect: Brake Fluid Level Switch C124.
Key in ON position.
With the parking brake released, observe the BRAKE warning indicator.
Is the BRAKE warning indicator always on?
Yes
GO to O12 .

No
INSTALL a new brake fluid level switch. TEST the system for normal operation.
O12 DETERMINE IF THE GEM IS INTERNALLY GROUNDED
Key in OFF position.
Disconnect: GEM C201e.
Key in ON position.
Observe the BRAKE warning indicator.
Is BRAKE warning indicator always on?
Yes
GO to O13 .

No
GO to O14 .
O13 CHECK CIRCUIT 128 (VT/YE) FOR SHORT TO GROUND BETWEEN GEM AND INSTRUMENT CLUSTER
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Measure the resistance between the GEM C201e pin 13, circuit 128 (VT/YE), harness side and ground.

Is resistance greater than 10,000 ohms?
Yes
GO to O15 .

No
REPAIR the circuit. TEST the system for normal operation.
O14 CHECK FOR CORRECT GEM OPERATION
Disconnect all GEM connectors.
Check for:
corrosion
pushed-out pins
Connect all GEM connectors and make sure they seat correctly.
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 . TEST the system for normal operation.

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.
O15 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: THE CHARGING SYSTEM WARNING INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
P1 CHECK THE CHARGING SYSTEM
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Check the charging system operation. Refer to Section 414-00 .
Is the charging system operating correctly?
Yes
GO to P2 .

No
REFER to Section 414-00 .
P2 CHECK CHARGING SYSTEM WARNING INDICATOR WITH ENGINE OFF
Key in ON position.
Observe the charging system warning indicator.
Is the charging system warning indicator on?
Yes
GO to P5 .

No
GO to P3 .
P3 CHECK THE INSTRUMENT CLUSTER INPUT
Key in OFF position.
Disconnect: Generator C102c.
Connect a fused (10A) jumper wire between the generator C102c pin 1, circuit 904 (LG/RD), harness side and ground.

Key in ON position.
Does the charging system indicator illuminate?
Yes
INSTALL a new generator. REFER to Section 414-02 . TEST the system for normal operation.

No
GO to P4 .
P4 CHECK CIRCUIT 904 (LG/RD) FOR OPEN
Key in OFF position.
Disconnect: Instrument Cluster C220a .
Measure the resistance between the instrument cluster C220a pin 5, circuit 904 (LG/RD), harness side and the generator C102c pin 1, circuit 904 (LG/RD), harness side.

Is the resistance less than 5 ohms?
Yes
GO to P7 .

No
REPAIR the circuit. TEST the system for normal operation.
P5 CHECK THE GENERATOR
Key in OFF position.
Disconnect: Generator C102c.
Key in ON position.
Does the charging system indicator illuminate?
Yes
GO to P6 .

No
INSTALL a new generator. REFER to Section 414-02 . TEST the system for normal operation.
P6 CHECK CIRCUIT 904 (LG/RD) FOR SHORT TO GROUND
Key in OFF position.
Measure the resistance between the generator C102c pin 1, circuit 904 (LG/RD), harness side and ground.

Is the resistance greater than 10,000 ohms?
Yes
GO to P7 .

No
REPAIR the circuit. TEST the system for normal operation.
P7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: THE HIGH BEAM INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
Q1 CHECK THE HIGH BEAM LAMP OPERATION
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Key in ON position.
Operate the high beams.
Do the high beams operate correctly?
Yes
GO to Q2 .

No
REFER to Section 417-01 .
Q2 CHECK CIRCUIT 932 (GY/WH) AND CIRCUIT 12 (LG/BK) FOR AN OPEN
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the instrument cluster C220b pin 2, circuit 12 (LG/BK), harness side and ground, while turning the high beams on and off.

Is the voltage 0 volts with the high beams off and greater than 10 volts with the high beams on?
Yes
GO to Q3 .

No
REPAIR the circuit. TEST the system for normal operation.
Q3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: THE ABS WARNING INDICATOR IS NEVER ON
Test Step Result / Action to Take
R1 CHECK THE ABS WARNING INDICATOR OPERATION
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Key in ON position.
Observe the ABS warning indicator. The ABS indicator should prove out for approximately six seconds then turn off.
Does the ABS warning indicator operate correctly?
Yes
The system is operating normally at this time.

No
If the indicator is inoperative, GO to R2 .

If the indicator is always on, REFER to Section 206-09A or Section 206-09B .
R2 CHECK THE INSTRUMENT CLUSTER INPUT
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C135.
Connect a fused (10A) jumper wire between the anti-lock brake control module C135 pin 16, circuit 603 (DG), harness side and ground.

Key in ON position.
Does the ABS indicator illuminate?
Yes
REFER to Section 206-09A or Section 206-09B .

No
GO to R3 .
R3 CHECK CIRCUIT 603 (DG) FOR AN OPEN
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Measure the resistance between the instrument cluster C220b pin 15, circuit 603 (DG), harness side and the anti-lock brake control module C135 pin 16, circuit 603 (DG), harness side.

Is the resistance less than 5 ohms?
Yes
GO to R4 .

No
REPAIR the circuit. TEST the system for normal operation.
R4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 SERVICE ENGINE SOON INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
S1 CARRY OUT THE INSTRUMENT CLUSTER SERVICE ENGINE SOON INDICATOR ACTIVE COMMAND
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Trigger the instrument cluster active command MIL.
Did the SERVICE ENGINE SOON indicator illuminate?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No
GO to S2 .
S2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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: THE TURN/HAZARD INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
T1 CHECK THE TURN SIGNAL AND HAZARD LAMPS OPERATION
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Key in ON position.
Operate the left and right turn signals.
Operate the hazard lamps.
Do the turn signals and hazard lamps operate correctly?
Yes
GO to T2 .

No
REFER to Section 417-01 .
T2 CHECK THE CIRCUIT IN QUESTION — CIRCUIT 2 (WH/LB) (RH) OR CIRCUIT 3 (LG/WH) (LH)
Key in OFF position.
Disconnect: Instrument Cluster C220a (RH) or C220b (LH).
Key in ON position.
Measure the voltage between the instrument cluster C220a pin 3, circuit 3 (LG/WH), harness side and ground, while the steering column multifunction switch is placed in the left turn position (LH); or between the instrument cluster C220b pin 3, circuit 2 (WH/LB), harness side and ground, while the steering column multifunction switch is placed in the right turn position (RH).

Does the voltage alternate between 0 volts and 10 volts with the turn signal on?
Yes
GO to T3 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation.
T3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 U: THE TRACTION CONTROL INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
U1 DETERMINE IF THE TRACTION CONTROL INDICATOR IS ALWAYS ON
Observe the traction control indicator.
Is the indicator always on?
Yes
REFER to Section 206-09B .

No
GO to U2 .
U2 DETERMINE IF INSTRUMENT CLUSTER IS AT FAULT
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
Trigger the instrument cluster active command TRAC OFF.
Did the traction control indicator illuminate?
Yes
REFER to Section 206-09B .

No
GO to U3 .
U3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 V: THE INSTRUMENT CLUSTER IS INOPERATIVE
Test Step Result / Action to Take
V1 CHECK THE BATTERY POWER SUPPLY TO THE INSTRUMENT CLUSTER
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Measure voltage between the instrument cluster C220b pin 10, circuit 729 (RD/WH), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to V2 .

No
REPAIR the circuit. TEST the system for normal operation.
V2 CHECK THE RUN POWER SUPPLY TO THE INSTRUMENT CLUSTER
Key in ON position.
Measure the voltage between the instrument cluster C220b pin 11, circuit 489 (PK/BK), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to V3 .

No
REPAIR the circuit. TEST the system for normal operation.
V3 CHECK RUN/START POWER SUPPLY TO THE INSTRUMENT CLUSTER
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Key in ON position.
Measure the voltage between the instrument cluster C220b pin 12, circuit 20 (WH/LB), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to V4 .

No
REPAIR the circuit. TEST the system for normal operation.
V4 CHECK GROUND CIRCUIT 397 (BK/WH) FOR AN OPEN
Key in OFF position.
Measure the resistance between the instrument cluster C220b pin 20, circuit 397 (BK/WH), harness side and ground.

Is the resistance less than 5 ohms?
Yes
GO to V5 .

No
REPAIR the circuit. TEST the system for normal operation.
V5 CHECK GROUND CIRCUIT 1205 (BK) FOR OPEN
Measure the resistance between the instrument cluster C220b pin 1, circuit 1205 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
GO to V6 .

No
REPAIR the circuit. TEST the system for normal operation.
V6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they seat correctly.
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. TEST the system for normal operation.

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 W: NO COMMUNICATION WITH THE GENERIC ELECTRONIC MODULE (GEM)
Test Step Result / Action to Take
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
W1 CHECK THE GENERIC ELECTRONIC MODULE (GEM) POWER SUPPLY
Key in OFF position.
Disconnect: Generic Electronic Module (GEM) C201a.
Disconnect: GEM C201b.
Key in ON position.
Using the following table, measure the voltage between the GEM, harness side and ground.

Connector Pin Circuit
C201a 4 400 (LB/BKK)
C201a 1 1006 (DG/WH)
C201b 2 1001 (WH/YE)
C201b 3 193 (YE/LG)


Are the voltages greater than 10 volts?
Yes
GO to W2 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation.
W2 CHECK THE GEM GROUND CIRCUIT 397 (BK/WH) FOR OPEN
Key in OFF position.
Measure the resistance between the GEM C201b pin 4, circuit 397 (BK/WH), harness side and ground.

Is the resistance less than 5 ohms?
Yes
GO to W3 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation.
W3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
Measure the voltage between the GEM C201b pin 4, circuit 397 (BK/WH), harness side and ground.

Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.

No
REFER to Section 418-00 .


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[hotcobra03]

abs traction control

SECTION 206-09B: Anti-Lock Control — Traction Control 2003 Mustang Workshop Manual
DIAGNOSIS AND TESTING Procedure revision date: 03/18/2002

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Anti-Lock Control —Traction Control Printable View (165 KB)
Refer to Wiring Diagrams Cell 42 , Anti-Lock Brake System for schematic and connector information.


Special Tool(s) Worldwide Diagnostic System (WDS)
418-F224,

New Generation STAR (NGS) Tester
418-F052, or equivalent scan tool
73 Digital Multimeter or equivalent
105-R0051

Principles of Operation

The anti-lock-brake control module receives wheel speed readings from each anti-lock brake sensor and processes this information to determine if an ABS event is necessary. The anti-lock brake sensor electrically senses each tooth of the anti-lock brake sensor indicators as it passes through the anti-lock brake sensor's magnetic field.

The anti-lock brake control module continuously monitors and compares the rotational speed of each wheel and, when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper. This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the anti-lock brake control module returns the solenoid valves to their normal position, and normal (base) braking resumes.

The anti-lock brake control module is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will do a preliminary electrical check, and at approximately 12 km/h (8 mph) the pump motor is turned on for approximately one half-second. Also during all phases of operation the anti-lock brake control module (after the vehicle is in motion) checks for correct operation of the anti-lock brake sensors. Any malfunction of the ABS will cause the ABS to shut off and ABS warning indicator to illuminate; normal power assisted braking, however, remains.

The ABS control module has the ability to store multiple DTCs in memory.

The traction control system controls wheelspin by modulating the engine torque by communicating to the powertrain control module (PCM) and by applying, then releasing, the appropriate brake to restore traction when one or both drive wheels lose traction and begin to spin during acceleration.

The traction control system can be disabled by depressing the traction control switch. The traction control system will reset and return to normal traction assist when the ignition switch is cycled or when the traction control switch is depressed again.


Inspection and Verification

Verify the customer concern by operating the system.
Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
Low brake fluid
Anti-lock brake sensor
Anti-lock brake sensor indicator
Base brake system
Wheel bearings
Central junction box (CJB) Fuse:
5 (15A)
15 (10A)
29 (15A)
33 (15A)
35 (15A)
Battery junction box (BJB) Fuse:
ABS 1 (50A)
ABS 2 (20A)
Circuitry
Damaged or corroded connectors
ABS warning indicator
Loose grounds



If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan 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.
If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00.
NO RESP/NOT EQUIP for the anti-lock brake control module, Go To Pinpoint Test A .
SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the anti-lock brake control module.
If the DTCs retrieved are related to the concern, go to the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index to continue diagnostics.
If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics.

Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index

NOTE: If a wheel speed signal fault or a pump motor fault is detected, the yellow ABS warning indicator cannot be reset with the key OFF and key ON method. The vehicle must be driven over 12 km/h (8 mph) for the anti-lock brake control module to do a re-check of the system before the yellow ABS warning indicator is turned OFF.



Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action
B1318 Battery Voltage Low ABS/TC Go To Pinpoint Test C .
B1342 ECU Is Defective ABS/TC INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.
B1484 Brake Pedal Input Open Circuit ABS/TC Go To Pinpoint Test D .
B1596 Repair Continuous Codes ABS/TC REPAIR the DTCs retrieved.
C1095 ABS Hydraulic Pump Motor Circuit Failure ABS/TC Go To Pinpoint Test E .
C1145 RF Anti-Lock Brake Sensor Input Circuit Failure ABS/TC Go To Pinpoint Test F .
C1155 LF Anti-Lock Brake Sensor Input Circuit Failure ABS/TC Go To Pinpoint Test F .
C1165 RR Anti-Lock Brake Sensor Input Circuit Failure ABS/TC Go To Pinpoint Test F .
C1175 LR Anti-Lock Brake Sensor Input Circuit Failure ABS/TC Go To Pinpoint Test F .
C1222 Anti-Lock Brake Sensor Mismatch ABS/TC Go To Pinpoint Test G .
C1233 LF Anti-Lock Brake Sensor Input Signal Missing ABS/TC Go To Pinpoint Test H .
C1234 RF Anti-Lock Brake Sensor Input Signal Missing ABS/TC Go To Pinpoint Test H .
C1235 RR Anti-Lock Brake Sensor Input Signal Missing ABS/TC Go To Pinpoint Test H .
C1236 LR Anti-Lock Brake Sensor Input Signal Missing ABS/TC Go To Pinpoint Test H .
C1266 ABS Valve Power Relay Circuit Failure ABS/TC INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.
C1805 Mismatched PCM and/or Anti-Lock Brake Control Module ABS/TC CLEAR the DTCs. RETRIEVE the DTCs. If DTC C1805 is retrieved, check the PCM and Anti-Lock Brake Control Module is for the correct vehicle. INSTALL a new PCM or anti-lock brake control module as necessary. CLEAR the DTCs. REPEAT the self-test.
U1009 SCP (J1850) Invalid or Missing Data for Engine Torque ABS/TC CARRY OUT the PCM self-test.
U1027 SCP (J1850) Invalid or Missing Data for Engine RPM ABS/TC CARRY OUT the PCM self-test.
U1059 SCP (J1850) Invalid or Missing Data for Transmission/Transaxle/PRNDL ABS/TC CARRY OUT the PCM self-test.
U1083 SCP (J1850) Invalid or Missing Data for Engine Systems ABS/TC CARRY OUT the PCM self-test.
U1262 SCP (J1850) Communication Bus Fault ABS/TC REFER to Section 418-00 .



Anti-Lock Brake Control Module Parameter Identification (PID) Index

Anti-Lock Brake Control Module Parameter Identification (PID) Index PID Description Expected Value
CCNTABS Number of Continuous DTCS in the Anti-Lock Brake Control Module one count per bit
BOO_ABS Brake Switch Input OFF, ON
PMP_MTR ABS Pump Motor OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
VLV_CTR ABS Valve Control Relay OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
LF_WSPD LF Wheel Speed 0-255 MPH
RF_WSPD RF Wheel Speed 0-255 MPH
LR_WSPD LR Wheel Speed 0-255 MPH
RR_WSPD RR Wheel Speed 0-255 MPH
ABSLF_I LF ABS Inlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSLF_O LF ABS Outlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSRF_I RF ABS Inlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSRF_O RF ABS Outlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSLR_I LR ABS Inlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSLR_O LR ABS Outlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSRR_I RR ABS Inlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
ABSRR_O RR ABS Outlet Valve OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
LF_TC_P LF Traction Control Priming Valve OFF, ON
RF_TC_P RF Traction Control Priming Valve OFF, ON
LR_TC_P LR Traction Control Priming Valve OFF, ON
RR_TC_P RR Traction Control Priming Valve OFF, ON
LF_TC_S LF Traction Control Switching Valve OFF, ON
RF_TC_S RF Traction Control Switching Valve OFF, ON
LR_TC_S LR Traction Control Switching Valve OFF, ON
RR_TC_S RR Traction Control Switching Valve OFF, ON
T/ALVAL Left Traction Control Valve Output State OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG
T/ARVAL Right Traction Control Valve Output State OFF---, OFFO--, OFF-B-, OFF--G, OFFO-G, OFF-BG, OFFOBG, ON---, ONO--, ON-B-, ON--G, ONO-G, ON-BG, ONOBG



Anti-Lock Brake Control Module Active Command Index

Anti-Lock Brake Control Module Active Command Index Active Command Display Action
ABS OUTPUT CONTROL ABS POWER OFF, ON
DSBL TOG OFF, ON
LF INLET OFF, ON
LF OUTLET OFF, ON
RF INLET OFF, ON
RF OUTLET OFF, ON
LR INLET OFF, ON
LR OUTLET OFF, ON
RR INLET OFF, ON
RR OUTLET OFF, ON
TRACTION CONTROL PRIMARY AND SWITCHING VALVE CONTROL LF TC PRV OFF, ON
LF TC SWV OFF, ON
RF TC PRV OFF, ON
RF TC SWV OFF, ON
LR TC PRV OFF, ON
LR TC SWV OFF, ON
RR TC PRV OFF, ON
RR TC SWV OFF, ON



Symptom Chart

Symptom Chart
NOTE: Refer to the wiring diagrams for connector numbers stated in the pinpoint test.
Condition Possible Sources Action
No communication with the anti-lock brake control module
CJB Fuse 29 (15A).
Circuitry.
Anti-lock brake control module.
Go To Pinpoint Test A .

Unable to enter self-test
Anti-lock brake control module.
Go To Pinpoint Test B .

The yellow ABS warning indicator does not self-check
Circuitry.
Anti-lock brake control module.
Instrument cluster.
Go To Pinpoint Test I .

Spongy brake pedal with no warning indicator
Air in the brake system.
Base brake system.
Hydraulic control unit (HCU).
Go To Pinpoint Test J .
REFER to Section 206-00 .

Poor vehicle tracking during anti-lock function
Air in the brake system.
Hydraulic control unit (HCU).
Base brake system.
Go To Pinpoint Test K .
REFER to Section 206-00 .

The traction control is inoperative—does not operate correctly
CJB 5 (15A).
Circuitry.
Traction control switch.
Instrument cluster.
Anti-lock brake control module.
Go To Pinpoint Test L .

The traction control indicator is inoperative—traction control switch
Circuitry.
Traction control switch.
Instrument cluster.
Go To Pinpoint Test M .


Pinpoint Tests


PINPOINT TEST A: NO COMMUNICATION WITH THE ANTI-LOCK BRAKE CONTROL MODULE
Test Step Result / Action to Take
A1 CHECK CIRCUIT 601 (LB/PK) FOR AN OPEN
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Key in ON position.
Measure the voltage between anti-lock brake control module C141 Pin 8, Circuit 601 (LB/PK), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to A2 .

No
REPAIR the circuit. REPEAT the self-test.
A2 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE GROUNDS
Measure the resistance between anti-lock brake control module C141 Pin 12, Circuit 1205 (BK), harness side and ground; and between anti-lock brake control module C141 Pin 15, Circuit 397 (BK/WH), harness side and ground.

Are the resistances less than 5 ohms?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
REPAIR the circuit in question. REPEAT the self-test.

PINPOINT TEST B: UNABLE TO ENTER SELF-TEST
Test Step Result / Action to Take
B1 CHECK THE COMMUNICATIONS TO THE ANTI-LOCK BRAKE CONTROL MODULE
Check the communications to the anti-lock brake control module.
Does the scan tool communicate with the anti-lock brake control module?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
Go To Pinpoint Test A .

PINPOINT TEST C: DTC B1318, BATTERY VOLTAGE LOW
Test Step Result / Action to Take
C1 CHECK BATTERY VOLTAGE
Measure the battery voltage between the positive and negative battery posts with the key ON engine OFF (KOEO), and with the engine running.

Is the battery voltage between 10 and 13 volts with KOEO, and between 11 and 17 volts with the engine running?
Yes
GO to C2 .

No
REFER to Section 414-00 .
C2 CHECK THE VOLTAGE TO THE ANTI-LOCK BRAKE CONTROL MODULE
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Key in ON position.
Measure the voltage between anti-lock brake control module C141 Pin 8, Circuit 601 (LB/PK), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to C3 .

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C3 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE GROUNDS
Measure the resistance between anti-lock brake control module C141 Pin 12, Circuit 1205 (BK), harness side and ground; and between anti-lock brake control module C141 Pin 15, Circuit 397 (BK/WH), harness side and ground.

Are the resistances less than 5 ohms?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

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

PINPOINT TEST D: DTC B1484, BRAKE PEDAL INPUT OPEN CIRCUIT
Test Step Result / Action to Take
D1 CHECK THE STOPLAMPS FOR CORRECT OPERATION
Depress the brake pedal while checking the stoplamps.
Do the stop lamps illuminate?
Yes
GO to D2 .

No
REFER to Section 417-01 .
D2 CHECK THE BRAKE PEDAL INPUT TO THE ANTI-LOCK BRAKE CONTROL MODULE
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Measure the voltage between anti-lock brake control module C141 Pin 6, Circuit 511 (LG), harness side and ground, while depressing and releasing the brake pedal.

Is the voltage greater than 10 volts with the brake pedal depressed and zero volts with the brake pedal released?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
REPAIR Circuit 511 (LG) and Circuit 810 (RD/LG) as necessary. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST E: DTC C1095, ABS HYDRAULIC PUMP MOTOR FAILURE
Test Step Result / Action to Take
E1 CHECK THE PUMP MOTOR FOR CONTINUOUS OPERATION
Check the pump motor for continuous operation.
Is the pump motor running continuously?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
GO to E2 .
E2 CHECK CIRCUIT 534 (YE/LG) FOR AN OPEN
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Measure the voltage between anti-lock brake control module C141 Pin 13, Circuit 534 (YE/LG), harness side, and ground.

Is the voltage greater than 10 volts?
Yes
GO to E3 .

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
E3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
Measure the resistance between anti-lock brake control module C141 Pin 12, Circuit 1205 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
GO to E4 .

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
E4 CHECK THE PUMP MOTOR FOR OPERATION
Disconnect: Pump Motor Connector.
Connect a 30A fused heavy jumper wire between the positive battery post and pump motor connector Pin 1 (component side); and momentarily connect a heavy jumper between negative battery post and pump motor connector Pin 2 (component side).

Does the pump motor operate?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
INSTALL a new HCU; REFER to Hydraulic Control Unit . CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST F: DTC C1145 (RF), C1155 (LF), C1165 (RR), C1175 (LR), ANTI-LOCK BRAKE SENSOR INPUT CIRCUIT FAILURE
Test Step Result / Action to Take
F1 CHECK THE SUSPECT ANTI-LOCK BRAKE SENSOR CIRCUIT FOR SHORT TO POWER
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Key in ON position.
Measure the voltage between anti-lock brake control module C141 Pins, harness side and ground as follows:

DTC Anti-Lock Brake Control Module C141 Pin Circuit
C1145 (RF) 4 514 (YE/RD)
C1155 (LF) 20 521 (TN/OG)
C1165 (RR) 1 494 (TN/LG)
C1175 (LR) 22 496 (OG)



Is any voltage present?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No
GO to F2 .
F2 CHECK THE SUSPECT ANTI-LOCK BRAKE SENSOR CIRCUIT FOR SHORT TO GROUND
Key in OFF position.
Measure the resistance between anti-lock brake control module C141 Pins, harness side and ground as follows:

DTC Anti-Lock Brake Control Module C141 Pin Circuit
C1145 (RF) 4 514 (YE/RD)
C1155 (LF) 20 521 (TN/OG)
C1165 (RR) 1 494 (TN/LG)
C1175 (LR) 22 496 (OG)



Is the resistance greater than 10,000 ohms?
Yes
GO to F4 .

No
GO to F3 .
F3 CHECK THE SUSPECT ANTI-LOCK BRAKE SENSOR FOR A SHORT TO GROUND
Disconnect: Suspect Anti-Lock Brake Sensor.
Measure the resistance between suspect anti-lock brake sensor Pin 1 (component side) and ground.

Is the resistance greater than 10,000 ohms?
Yes
If RF, REPAIR Circuit 514 (YE/RD) and Circuit 516 (YE/BK), as necessary. CLEAR the DTCs. REPEAT the self-test. If LF, REPAIR Circuit 521 (TN/OG) and Circuit 522 (TN/BK), as necessary. CLEAR the DTCs. REPEAT the self-test. If RR, REPAIR Circuit 494 (TN/LG) and Circuit 492 (BN), as necessary. CLEAR the DTCs. REPEAT the self-test. If LR, REPAIR Circuit 496 (OG) and Circuit 499 (GY/BK), as necessary. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new anti-lock brake sensor; REFER to Sensor—Front or Sensor—Rear . CLEAR the DTCs. REPEAT the self-test.
F4 CHECK THE SUSPECT ANTI-LOCK BRAKE SENSOR CIRCUIT FOR FOR AN OPEN
Key in OFF position.
Measure the resistance between anti-lock brake control module C141 Pins, harness side and suspect anti-lock brake sensor, harness side as follows:

DTC Anti-Lock Brake Control Module Anti-Lock Brake Sensor Circuit
C1145 (RF) C141 Pin 4 C145 Pin 1 514 (YE/RD)
C1145 (RF) C141 Pin 5 C145 Pin 2 516 (YE/BK)
C1155 (LF) C141 Pin 20 C144 Pin 1 521 (TN/OG)
C1155 (LF) C141 Pin 21 C144 Pin 2 522 (TN/BK)
C1165 (RR) C141 Pin 1 C319 Pin 2 494 (TN/LG)
C1165 (RR) C141 Pin 3 C319 Pin 1 492 (BN)
C1175 (LR) C141 Pin 22 C320 Pin 2 496 (OG)
C1175 (LR) C141 Pin 23 C320 Pin 1 499 (GY/BK)



Are the resistances less than 5 ohms?
Yes
GO to F5 .

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
F5 CHECK THE ANTI-LOCK BRAKE SENSOR
Measure the resistance between suspect anti-lock brake sensor pin 1 (component side) and suspect anti-lock brake sensor pin 2 (component side).

Is the resistance between 1280 and 1920 (front) or 1830 and 2760 (rear) ohms?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
INSTALL a new anti-lock brake sensor; REFER to Sensor—Front or Sensor—Rear . CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST G: DTC C1222, ANTI-LOCK BRAKE SENSOR MISMATCH
Test Step Result / Action to Take
G1 CHECK THE VEHICLE COMPONENTS
Check for correct wheel and tire size, front-to-rear and side-to-side.
Check for excessive bearing end play.
Check the anti-lock brake sensor indicator for a bent sensor ring or missing teeth.
Are the conditions OK?
Yes
GO to G2 .

No
REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
G2 TEST DRIVE THE VEHICLE
Enter the following diagnostic mode on the diagnostic tool: CLEAR the DTCs.
Key in OFF position.
Key in ON position.
Test drive the vehicle over 24 km/h (15 mph).
Enter the following diagnostic mode on the diagnostic tool: Retrieve DTCs.
Is DTC C1222 retrieved?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
If another DTC is retrieved, GO to the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) index. If no DTCs are retrieved, system is OK.

PINPOINT TEST H: DTC C1233 (LF), C1234 (RF), C1235 (RR), C1236 (LR), ANTI-LOCK BRAKE SENSOR INPUT SIGNAL MISSING
Test Step Result / Action to Take
H1 CHECK THE SUSPECT ANTI-LOCK BRAKE SENSOR
Check the suspect anti-lock brake sensor mounting.
Check the suspect anti-lock brake sensor for excessive dirt build up, obstructions, and damage.
Is the suspect anti-lock brake sensor and mounting OK?
Yes
GO to H2 .

No
REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
H2 CHECK THE SUSPECT ANTI-LOCK BRAKE SENSOR INDICATOR
Check the suspect anti-lock brake sensor indicator for corrosion, nicks, bridged teeth, damaged teeth, correct mounting, and alignment with the anti-lock brake sensor.
Check the air gap and bearing end play.
Is the suspect anti-lock brake sensor indicator OK?
Yes
GO to H3 .

No
INSTALL a new anti-lock brake sensor indicator; REFER to Sensor Indicator—Front or Sensor Indicator—Rear . CLEAR the DTCs. REPEAT the self-test.
H3 CHECK THE ANTI-LOCK BRAKE SENSOR OUTPUT
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: CLEAR the DTCs.
Key in OFF position.
Key in ON position.
Have an assistant monitor the anti-lock brake control module PIDs LF_WSPD, RF_WSPD, LR_WSPD, and RR_WSPD while driving at various speeds.
NOTE: the vehicle must be driven 16 km (10 miles) during this test step.
Test drive the vehicle for 16 km (10 miles).
Are the anti-lock brake control module PIDs approximately the same at all times?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . REPEAT the self-test.

No
INSTALL a new anti-lock brake sensor; REFER to Sensor—Front or Sensor—Rear . CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST I: THE YELLOW ABS WARNING INDICATOR DOES NOT SELF-CHECK
Test Step Result / Action to Take
I1 CHECK THE ABS WARNING INDICATOR CIRCUITRY
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C141.
Key in ON position.
Depress and release the shorting bar connector internal to the anti-lock brake control module C141, harness side, while checking the yellow ABS warning indicator in the instrument cluster.
Does the yellow ABS indicator illuminate with the shorting bar released and OFF with the shorting bar depressed?
Yes
INSTALL a new anti-lock brake control module; REFER to Module . TEST the system for normal operation.

No
REFER to Section 413-01 .

PINPOINT TEST J: SPONGY BRAKE PEDAL WITH NO WARNING INDICATOR
Test Step Result / Action to Take
J1 CHECK THE VEHICLE COMPONENTS
Check the brake pedal and power booster/brake master cylinder for correct attachment.
Are the components OK?
Yes
GO to J2 .

No
REPAIR as necessary. TEST the system for normal operation.
J2 BLEED THE BRAKE SYSTEM
Bleed the brake system; REFER to Section 206-00 .
Check for spongy brake pedal.
Is the brake pedal spongy?
Yes
INSTALL a new HCU; REFER to Hydraulic Control Unit . TEST the system for normal operation.

No
The brake system is OK. TEST the system for normal operation.

PINPOINT TEST K: POOR VEHICLE TRACKING DURING ANTI-LOCK FUNCTION
Test Step Result / Action to Take
K1 BLEED THE BRAKE SYSTEM
Bleed the brake system; REFER to Section 206-00 .
Check for vehicle tracking poorly.
Does the vehicle track poorly?
Yes
GO to K2 .

No
The brake system is OK. TEST the system for normal operation.
K2 CHECK THE LF ABS VALVE OPERATION
Lift the vehicle and rotate all the wheels to make sure they rotate freely (the vehicle must be in neutral).
NOTE: Trigger must be depressed twice. Each depress runs the pump motor for two seconds.
Trigger the anti-lock brake control module active command PMP MOTOR ON for four seconds.
Apply moderate brake pedal effort.
Have an assistant attempt to rotate the LF wheel while the pump motor is running.
Does the LF wheel rotate?
Yes
INSTALL a new HCU; REFER to Hydraulic Control Unit . TEST the system for normal operation.

No
GO to K3 .
K3 CHECK THE LF ABS VALVE RELEASE
Apply moderate brake pedal effort.
Trigger the anti-lock brake control module active command LF INLET and LF OUTLET.
NOTE: Trigger must be depressed twice. Each depress runs the pump motor for two seconds.
Have an assistant rotate the LF wheel immediately after depressing trigger.
Does the LF wheel rotate?
Yes
GO to K4 .

No
GO to K10 .
K4 CHECK THE RF ABS VALVE OPERATION
NOTE: Trigger must be depressed twice. Each depress runs the pump motor for two seconds.
Trigger the anti-lock brake control module active command PMP MOTOR ON for four seconds.
Apply moderate brake pedal effort.
Have an assistant attempt to rotate the RF wheel while the pump motor is running.
Does the RF wheel rotate?
Yes
INSTALL a new HCU; REFER to Hydraulic Control Unit . TEST the system for normal operation.

No
GO to K5 .
K5 CHECK THE RF ABS VALVE RELEASE
Apply moderate brake pedal effort.
Trigger the anti-lock brake control module active command RF INLET and RF OUTLET.
NOTE: The scan tool will energize the valves for only two seconds per trigger press.
Have an assistant rotate the RF wheel immediately after depressing trigger.
Does the RF wheel rotate?
Yes
GO to K6 .

No
GO to K10 .
K6 CHECK THE LR ABS VALVE OPERATION
NOTE: Trigger must be depressed twice. Each depress runs the pump motor for two seconds.
Trigger the anti-lock brake control module active command PMP MOTOR ON for four seconds.
Apply moderate brake pedal effort.
Have an assistant attempt to rotate the LR wheel while the pump motor is running.
Does the LR wheel rotate?
Yes
INSTALL a new HCU; REFER to Hydraulic Control Unit . TEST the system for normal operation.

No
GO to K7 .
K7 CHECK THE LR ABS VALVE RELEASE
Apply moderate brake pedal effort.
Trigger the anti-lock brake control module active command LR INLET and LR OUTLET.
NOTE: The scan tool will energize the valves for only two seconds per trigger press.
Have an assistant rotate the LR wheel immediately after depressing trigger.
Does the LR wheel rotate?
Yes
GO to K8 .

No
GO to K10 .
K8 CHECK THE RR ABS VALVE OPERATION
NOTE: Trigger must be depressed twice. Each depress runs the pump motor for two seconds.
Trigger the anti-lock brake control module active command PMP MOTOR ON for four seconds.
Apply moderate brake pedal effort.
Have an assistant attempt to rotate the RR wheel while the pump motor is running.
Does the RR wheel rotate?
Yes
INSTALL a new HCU; REFER to Hydraulic Control Unit . TEST the system for normal operation.

No
GO to K9 .
K9 CHECK THE RR ABS VALVE RELEASE
Apply moderate brake pedal effort.
Trigger the anti-lock brake control module active command RF INLET and RF OUTLET.
NOTE: The scan tool will energize the valves for only two seconds per trigger press.
Have an assistant rotate the RR wheel immediately after depressing trigger.
Does the RR wheel rotate?
Yes
The ABS system is operating correctly.

No
GO to K10 .
K10 CHECK FOR DTCS
Carry out the anti-lock brake control module self-test.
Are any DTCs retrieved?
Yes
GO to the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index.

No
INSTALL a new HCU; REFER to Hydraulic Control Unit . TEST the system for normal operation.

PINPOINT TEST L: THE TRACTION CONTROL IS INOPERATIVE—DOES NOT OPERATE CORRECTLY
Test Step Result / Action to Take
L1 CHECK THE TRACTION CONTROL SWITCH CIRCUITRY
Key in OFF position.
Disconnect: Instrument Cluster C251.
Key in ON position.
Measure the voltage between instrument cluster C251 Pin 9, Circuit 959 (GY), harness side and ground, while depressing and releasing the traction control switch.

Is the voltage greater than 10 volts with the traction control switch depressed and zero volts with the traction control switch released?
Yes
INSTALL a new instrument cluster, REFER to Section 413-01 . TEST the system for normal operation.

No
GO to L2 .
L2 CHECK CIRCUIT 959 (GY) FOR AN OPEN
Key in OFF position.
Disconnect: Traction Control Switch C239.
Measure the resistance between instrument cluster C251 Pin 9, Circuit 959 (GY), harness side and traction control switch C239 Pin 4, Circuit 959 (GY), harness side.

Is the resistance less than 5 ohms?
Yes
GO to L3 .

No
REPAIR the circuit. TEST the system for normal operation.
L3 CHECK CIRCUIT 489 (PK/BK) FOR AN OPEN
Key in ON position.
Measure the voltage between traction control switch C239 Pin 3, Circuit 489 (PK/BK), harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new traction control switch. TEST the system for normal operation.

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

PINPOINT TEST M: THE TRACTION CONTROL INDICATOR IS INOPERATIVE—TRACTION CONTROL SWITCH
Test Step Result / Action to Take
M1 CHECK CIRCUIT 960 (BK/LB)
Key in OFF position.
Disconnect: Instrument Cluster C251.
Disconnect: Traction Control Switch C239.
Measure the resistance between instrument cluster C251 Pin 8, Circuit 960 (BK/LB), harness side and traction control switch C239 Pin 5, Circuit 960 (BK/LB), harness side; and between instrument cluster C251 Pin 8, Circuit 960 (BK/LB), harness side and ground.

Is the resistance less than 5 ohms between the instrument cluster and traction control switch and greater than 10,000 ohms between instrument cluster and ground?
Yes
GO to M2 .

No

M2 CHECK CIRCUIT 489 (PK/BK) FOR AN OPEN
Key in ON position.
Measure the voltage between traction control switch C239 Pin 3, Circuit 489 (PK/BK), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to M3 .

No
REPAIR the circuit. TEST the system for normal operation.
M3 CHECK THE TRACTION CONTROL SWITCH INDICATOR
Key in OFF position.
Connect: Traction Control Switch C239.
Key in ON position.
Momentarily connect a fused (10A) jumper wire between instrument cluster C251 Pin 8, Circuit 960 (BK/LB), harness side and ground, while observing the traction control switch indicator.

Does the traction control switch indicator illuminate?
Yes
INSTALL a new instrument cluster; REFER to Section 413-01 . TEST the system for normal operation.

No
INSTALL a new traction control switch. TEST the system for normal operation.


--------------------------------------------------------------------------------

 

[hotcobra03]

you can download our factory service manual from this site...copy and paste leaves out pictures...


see stickys in talk above threads...sometimes it doesnt work..there is a second link floating around...

i had stumbled on a link that works on android cell..its a little different than 1 on site...

 

[Zemedici]

same thing was happening to me, thought it was the sensors, so i cleaned them all. Light still came and went, more and more frequently, eventually it just stayed on.

Buddy scanned it 'unable to communicate with module'

Great, needs an ABS module.

Replaced it, good as new!

 

[hotcobra03]

 

[RAP66]

:banana: I totally forgot about the manual.... :banana:

Thanks soo much :rockon:, I'll let you know how it goes!!

-Rich

 

[RAP66]

:coolman: Great Guys!!! :banana:

Turned out to be a bad ABS Module. I got one from the salvage yard and swapped it out. No more error lights. This will work for now until I can grab a new module (they are pricey :dw.

 

[ATFPat]

Hey, having the same issue. On top of what happened to you, I actually had the traction control kick in where the ABS was working to limit the slip to the rear tires. Problem was, I wasn't moving lol.

Curious on where to get a new one through. I saw that on Rockauto.com they sold new ones plus there is a core charge for the old one. Also, did you try to just pull the fuse for the ABS module? Thinking of pulling the fuse so that I can still get miles on it before winter since I was planing on upgrading the brake system with new braided lines, calipers etc. Read there are two fuses, one that the PCM etc and the other which stands by itself. Wasn't sure if it would affect the drivability. I know the light will properly stay on, just didn't want the abs system to start acting up.

Add me to the list for an ABS module as well.