U110E

SYMPTOM
U110E - LOST AMBIENT TEMPERATURE MESSAGE

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. Scan Tool Testing and Procedures

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