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 TIPM. The circuit is continuously monitored.
| Possible Causes |
| CAN C BUS CIRCUIT OPEN OR SHORTED |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE).
Theory of Operation
The ambient temperature sensor signal is a direct input to the TIPM. The TIPM sends the PCM the ambient temperature signal over the CAN C bus.
Diagnostic Test
1. ACTIVE DTCNOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.
Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2. U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM) ALSO ACTIVE
With the scan tool read DTCs.
Is the DTC U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM) also set?
Yes
- Perform the diagnostic procedure for DTC U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM).
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)