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 busses the A/C pressure signal over the CAN bus the Powertrain Control Module (PCM).

- 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 BCM. 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

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. PCM Intermittent Condition Test.

2. U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM) ALSO ACTIVE
1. With the scan tool, select View DTCs.

Is the U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM) also set?

Yes

- Perform the U0141-Lost Communication with IPM (FCM/TIPM) diagnostic procedure. Totally Integrated Power Module (TIPM).

No

- Manufacturer Code Charts and perform the Stored Lost Communication DTCs diagnostic procedure.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.