U1113

U1113-LOST AC PRESSURE MESSAGE

For a complete wiring diagram Consult 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.Initial Inspection and Diagnostic Overview

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.

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 Communications Test for this DTC and/or Manufacturer Code Charts 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. Verification Tests