Chrysler Crossfire. Manual — part 93
NO CAN COMMUNICATIONS WITH PCM (CONTINUED)
When Monitored and Set Condition
•
When Monitored: With the ignition on.
•
Set Condition: CAN Bus communication failure between the Controller Antilock Brake (CAB) and the Power-
train Control Module (PCM).
POSSIBLE CAUSES
CAN C BUS (+) CIRCUIT OPEN
CAN C BUS (-) CIRCUIT OPEN
CONTROLLER ANTILOCK BRAKE
For a complete Brake Assist System (BAS) Circuit Diagram (Refer to 5 - BRAKES/ELECTRICAL - SCHEMATICS
AND DIAGRAMS).
Diagnostic Test
1.
MEASURE THE RESISTANCE OF THE CAN C BUS (+) CIRCUIT
Turn the ignition off.
Disconnect the CAB harness connector.
Disconnect the PCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the CAN C Bus (+) circuit from the CAB
harness connector to the PCM harness connector.
Is the resistance below 1.0 ohm?
Yes
>> Go to 2
No
>> Repair the CAN C Bus (+) circuit for an open.
Perform ABS VERIFICATION TEST.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 205
NO CAN COMMUNICATIONS WITH PCM (CONTINUED)
2.
MEASURE THE RESISTANCE OF THE CAN C BUS (-) CIRCUIT
With the ignition off.
Measure the resistance of the CAN C Bus (-) circuit from the CAB har-
ness connector to the PCM harness connector.
Is the resistance below 1.0 ohm?
Yes
>> Replace the Controller Antilock Brake. (Refer to 8 - ELEC-
TRICAL/ELECTRONIC CONTROL MODULES/CONTROL-
LER ANTILOCK BRAKE - REMOVAL).
Perform ABS VERIFICATION TEST.
No
>> Repair the CAN C Bus (-) circuit for an open.
Perform ABS VERIFICATION TEST.
5 - 206
BRAKES - ABS ELECTRICAL DIAGNOSTICS
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BAS RELEASE SWITCH CIRCUIT
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 207
BAS RELEASE SWITCH CIRCUIT (CONTINUED)
When Monitored and Set Condition
•
When Monitored: Ignition on.
•
Set Condition: The Controller Antilock Brake (CAB) detects a Brake Assist System (BAS) Release Switch mal-
function.
POSSIBLE CAUSES
BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT SHORT TO VOLTAGE
BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT SHORT TO GROUND
BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT SHORT TO 12 VOLT SUPPLY CIRCUIT
BAS RELEASE SWITCH SENSOR (RELEASED) CIRCUIT OPEN
BAS RELEASE SWITCH SENSE (APPLIED) CIRCUIT SHORT TO VOLTAGE
BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT SHORT TO ANOTHER CIRCUIT
BAS RELEASE SWITCH SENSE (APPLIED) CIRCUIT OPEN
BAS RELEASE SWITCH SENSE (APPLIED) CIRCUIT SHORT TO GROUND
BAS RELEASE SWITCH 12 VOLT SUPPLY CIRCUIT OPEN
BAS RELEASE SWITCH 12 VOLT SUPPLY CIRCUIT SHORT TO GROUND
BAS RELEASE SWITCH
CONTROLLER ANTILOCK BRAKE
For a complete Brake Assist System (BAS) Circuit Diagram (Refer to 5 - BRAKES/ELECTRICAL - SCHEMATICS
AND DIAGRAMS).
Diagnostic Test
1.
MEASURE THE VOLTAGE OF THE BAS RELEASE SWITCH SENSOR (APPLIED) CIRCUIT
Turn the ignition off.
Disconnect the BAS Brake Booster C2 harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the BAS Release Switch Sensor (Applied) cir-
cuit at the BAS Brake Booster C2 harness connector.
Is the voltage below 1.0 volt?
Yes
>> Go to 4
No
>> Go to 2
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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