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. PCM Pre-Diagnostic Troubleshooting Procedure.

Diagnostic Test

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. PCM 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). Totally Integrated Power Module (TIPM)
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

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