Jeep Grand Cherokee WK. Manual — part 190
U0141–LOST COMMUNICATION WITH FRONT CONTROL MODULE (CONTINUED)
3.
VERIFY THAT THE FCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the FCM is active on the bus.
Is the FCM active on the bus?
Yes
>> Go To 4
No
>> Refer to the Table of Contents located in this section for a no response test procedure.
Perform BODY VERIFICATION TEST – VER 1.
4.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network Diagnostics.
Is there more than one module with active DTCs “Logged Against” the FCM?
Yes
>> Replace/update the Front Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1.
No
>> Replace/update the module that set this DTC in accordance with the service information
Perform BODY VERIFICATION TEST – VER 1.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 387
U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/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, one valid CAN message received at least once, and no U0002-CAN C Bus
Off Performance DTC present.
•
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.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
U1003-ESP CAN C BUS PERFORMANCE
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 389
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