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• When Monitored: • Set Condition: 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 - Theory of Operation The ambient temperature sensor signal is a direct input to the FCM. The FCM sends the PCM the ambient tem- 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-NO BUS MESSAGE RECEIVED FROM THE FCM 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) 9 - 992 ENGINE ELECTRICAL DIAGNOSTICS LX |