U1113

U1113-LOST A/C PRESSURE MESSAGE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The A/C Pressure Transducer signal is a direct input to the Totally Integrated Power Module (TIPM). The Powertrain Control Module (PCM) receives the A/C pressure signal from the TIPM over the CAN C bus circuit.

- When Monitored:
Ignition on.

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





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC

NOTE: 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.

1. Ignition on, engine not running.
2. With the scan tool, select View PCM DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. U0141-LOST COMMUNICATION WITH TOTALLY INTEGRATED POWER MODULE ALSO ACTIVE
1. With the scan tool, select View DTCs.

Is the U0141-NO BUS MESSAGE RECEIVED FROM THE FRONT CONTROL MODULE (TIPM) also set?

Yes

- Follow the diagnostics for U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM). U0141.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

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