Jeep Grand Cherokee WK. Manual — part 194
U1501-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM PCM (CONTINUED)
For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Engine Control Module (ECM).
Possible Causes
FCM CAN BUS DTCS
ENGINE DTCS
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK IF FCM CAN BUS DTC’S ARE PRESENT
With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTC’s present?
Yes
>> Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diag-
nose the appropriate symptom.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
CHECK IF ENGINE DTC’S ARE PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine DTC’s present?
Yes
>> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for
corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no
problems are found, replace the Anti-Lock Brake Module per the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
5 - 402
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TCM
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 403
U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TCM (CONTINUED)
For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Transmission Control Module
(TCM).
Possible Causes
FCM CAN BUS DTCS
TRANSMISSION DTCS
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK IF FCM CAN BUS DTC’S ARE PRESENT
With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTC’s present?
Yes
>> Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diag-
nose the appropriate symptom.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
CHECK IF TRANSMISSION DTC’S ARE PRESENT
With the scan tool, read Transmission DTCs.
Are there any Transmission DTC’s present?
Yes
>> Refer to the 21 - TRANSMISSION ELECTRICAL DIAGNOSTICS and diagnose the appropriate symp-
tom.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for
corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no
problems are found, replace the Anti-Lock Brake Module per the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
5 - 404
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
U1503-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 405
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