U1113

U1113-LOST A/C PRESSURE MESSAGE





For a complete wiring diagram, refer to the wiring information Electrical Diagrams.

Theory of Operation

The A/C Pressure Transducer signal is a direct input to the TIPM. The TIPM sends the PCM the A/C pressure signal over the CAN C bus.

- When Monitored:
With the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than 3 seconds.

- Set Condition:
The PCM either doesn't receive a bus message or receives an implausible bus message from the TIPM. One trip fault.





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.

NOTE: Diagnose and repair any related sensor or communication DTCs in the TIPM before continuing with this test.

1. Start the engine and allow it to reach operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.

2. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Follow the diagnostics for U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE (TIPM). . U0141

No

- Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC.