U1113

U1113-LOST A/C PRESSURE MESSAGE





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Ignition on.

- Set Condition:
The PCM doesn't receive the A/C Pressure signal over the CAN C bus from the FCM. The circuit is continuously monitored. One Trip fault.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Theory of Operation

The A/C Pressure Transducer signal is a direct input to the FCM. The FCM sends the PCM the A/C pressure signal over the CAN C bus.

Diagnostic Test

1. ACTIVE DTC
Ignition on, engine not running.
With the scan tool, view PCM DTCs.
Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition.

2. U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE ALSO ACTIVE
With the scan tool view 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 the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test