Jeep Grand Cherokee WK. Manual — part 1127
U0168-LOST COMMUNICATION WITH SKREEM
9 - 1104
ENGINE ELECTRICAL DIAGNOSTICS
WK
U0168-LOST COMMUNICATION WITH SKREEM (CONTINUED)
For a complete wiring diagramRefer to Section 8W.
•
When Monitored:
Ignition run time is greater than 1 second. Battery voltage between 9 and 16 volts. Engine run time greater
than 3 seconds.
•
Set Condition:
The PCM doesn’t receive a SKREEM message over the CAN C circuit for 7 consecutive seconds. The circuit
is continuously monitored.
Possible Causes
CAN C BUS OPEN OR SHORTED CONDITION
SKREEM
FCM
PCM
Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic
procedures and for further possible causes.
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read PCM DTCs.
Is the DTC active at this time?
Yes
>> Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diag-
nostic procedures and for further possible causes.
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 1105
U110C-NO FUEL LEVEL BUS MESSAGE RECEIVED
9 - 1106
ENGINE ELECTRICAL DIAGNOSTICS
WK
U110C-NO FUEL LEVEL BUS MESSAGE RECEIVED (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
When the PCM does not receive a fuel level signal from the FCM over the CAN C circuit. The circuit is con-
stantly monitored.
Possible Causes
CAN C BUS CIRCUIT OPEN OR SHORTED
FRONT CONTROL MODULE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING) .
Theory of Operation
The fuel level signal is a direct input to the Cluster. The fuel level signal is sent to the FCM over the CAN B bus
circuit. The NGC receives the fuel level signal from the FCM over the CAN C bus circuit.
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.
U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE ALSO ACTIVE
With the scan tool read DTCs.
Is the U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE also set?
Yes
>> Follow the diagnostics for U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE
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)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 1107
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