Jeep Grand Cherokee WK. Manual — part 187
U0100-LOST COMMUNICATION WITH ECM/PCM (CONTINUED)
3.
VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the ECM/PCM is active on the bus.
Is the ECM/PCM 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 ECM/PCM?
Yes
>> Replace/update the ECM/PCM 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
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U0101-LOST COMMUNICATION WITH TCM
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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U0101-LOST COMMUNICATION WITH TCM (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the ignition on
•
Battery voltage between 10 and 16 volts
•
IOD fuse installed
•
FCM is configured correctly
•
Set Condition:
Bus messages not received from the TCM for approximately 500ms.
Possible Causes
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
TCM
TCM POWER AND GROUND
MODULE THAT SET THIS DTC
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
With the scan tool, read active DTCs.
Is this DTC active?
Yes
>> Go To 2
No
>> Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
Perform BODY VERIFICATION TEST – VER 1.
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read all active DTCs from all modules.
NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or igni-
tion related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
>> Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms.
Perform BODY VERIFICATION TEST – VER 1.
No
>> Go To 3
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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U0101-LOST COMMUNICATION WITH TCM (CONTINUED)
3.
VERIFY THAT THE TCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the TCM is active on the bus.
Is the TCM 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 TCM?
Yes
>> Replace/update the TCM 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.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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