U110E

U110E-LOST AMBIENT TEMPERATURE MESSAGE

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.

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.

Q: Is the DTC active at this time?

YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE ALSO ACTIVE

With the scan tool read DTCs.

Q: 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. Powertrain Verification Test
NO: Replace and program the Powertrain Control Module. Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test