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 Body Control Module (BCM). The BCM 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 BCM. 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. U1040-LOST COMMUNICATION WITH BODY CONTROL MODULE (BCM) ALSO ACTIVE
1. With the scan tool, select View DTCs.

Is the U1040-LOST COMMUNICATION WITH BODY CONTROL MODULE (BCM) also set?

Yes

- Perform the U0140-00-Lost Communication with Body Control Module (BCM) diagnostic procedure. U0140.

No

- Replace and program the Powertrain Control Module (PCM). PCM/ECM Reprogramming.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.