U110E

U110E-LOST AMBIENT TEMPERATURE MESSAGE





For the Engine circuit diagram, Refer to SCHEMATICS AND DIAGRAMS.

When Monitored
Ignition on.

Set Condition
The PCM doesn't receive the ambient temperature signal over the CAN C bus from the FCM. The circuit is continuously monitored.

Possible Causes
- CAN C BUS CIRCUIT OPEN OR SHORTED
- FRONT CONTROL MODULE
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Theory of Operation
The ambient temperature sensor signal is a direct input to the FCM. The FCM sends the PCM the ambient temperature signal over the CAN C bus.

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 (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test - Ver 5
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 (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test - Ver 5
No >> Replace and program the Powertrain Control Module per Service Information.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test - Ver 5