U1113

U1113-LOST AC PRESSURE MESSAGE

For a complete wiring diagram refer to Diagrams/Electrical

- When Monitored:

Continuously while the system is active.

- Set Condition:

An invalid message has been received over the bus from the Front Control Module (FCM).





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.


Diagnostic Test

1. ACTIVE DTC

NOTE: Diagnose all CAN B and C communication DTCs before continuing.

Ignition on, engine not running.

With a scan tool, view DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Checking for an Intermittent DTC

2. COMMUNICATION DTCS PRESENT IN THE FRONT CONTROL MODULE (FCM)

With a scan tool check for DTCs in the Front Control Module (FCM).

Are there any CAN bus DTCs active in the Front Control Module (FCM) at this time?

Yes

- Refer to Communication for additional vehicle communication diagnostic procedures.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace and program the Engine Control Module (ECM).
- Perform the ECM Verification Test Ver. 1. ECM Verification Test