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 TIPM sends the PCM the A/C pressure signal over the CAN C bus.

- When Monitored:
Ignition on.

- Set Condition:
The Powertrain Control Module (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
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

- Refer to 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.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.