U110E-LOST AMBIENT TEMPERATURE MESSAGE
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
Ignition on.
- Set Condition:
The PCM doesn't receive the ambient temperature signal over the CAN C bus from the BCM. The circuit is continuously monitored.
| Possible Causes |
| CAN C BUS CIRCUIT 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 ambient temperature sensor signal is a direct input to the BCM. The BCM sends the PCM the ambient temperature signal over the CAN C bus.
Diagnostic Test
1. ACTIVE DTCIgnition on, engine not running.
With the scan tool, select View 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. U0140-LOST COMMUNICATION WITH BODY CONTROL MODULE ALSO ACTIVE
With the scan tool view DTCs.
Is the U0140-NO BUS MESSAGE RECEIVED FROM THE BCM also set?
Yes
- Follow the diagnostics for U0140-LOST COMMUNICATION WITH BODY 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)