Jeep Liberty KJ. Manual — part 636
U1120-LOST WHEEL DISTANCE MESSAGE
For a complete wiring diagram Refer to Section 8W.
9 - 602
ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Ignition on.
•
Set Condition:
The PCM doesn’t receive a wheel distance message from the Anti-lock brake Module or BCM (NON-ABS) over
the CAN C bus.
Possible Causes
CAN C BUS CIRCUIT OPEN OR SHORTED
ANTI-LOCK BRAKE MODULE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Theory of Operation
The PCM receives the vehicle speed signal over the CAN C bus from the Anti-lock Brake Module or BCM (NON-
ABS).
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With the scan tool read Powertrain DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
U0121-LOST COMMUNICATION WITH ABS MODULE/P0140–LOST COMMUNICATION WITH BCM ALSO
SET
NOTE: If the vehicle is not equipped with ABS the VSS signal will come from the BCM.
With the scan tool, read the appropriate module for DTCs.
Is the U0121-LOST COMMUNICATION WITH ABS MODULE/P0140–Lost Communicate With BCM also
set?
Yes
>> Perform the appropriate diagnostic test. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 603
U1411-IMPLAUSIBLE FUEL VOLUME SIGNAL RECEIVED
For a complete wiring diagram Refer to Section 8W.
9 - 604
ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Ignition on.
•
Set Condition:
The fuel volume message the PCM is receiving is implausible. The circuit is continuously monitored.
Possible Causes
CAN C OPEN OR SHORTED
BODY CONTROL MODULE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Theory of Operation
The BCM has to send the PCM a fuel volume signal over CAN C. The signal the BCM sends over CAN C is
implausible.
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
CAN C BUS DTCS ALSO ACTIVE
With a scan tool check for DTCs in the BCM.
Are any CAN C related DTCs active at this time?
Yes
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the
appropriate diagnostic procedures.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 605
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