U1113C

U1113C-LOST WHEEL SPEED MESSAGES

For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

The ABS communicates with other controllers over the CAN C bus. The AWD Module continuously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate AWD Control Module MIL status to the Engine Controller, therefor if the Engine Controller is unable to communicate with the AWD Control Module, the Engine Controller will light the MIL.

- When Monitored:
Ignition on.

- Set Condition:
The AWD does not receive a vehicle speed signal from the Anti-lock brake Module over the CAN C bus.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

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.

Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go to 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC
- Perform AWD Control Module VERIFICATION TEST.AWD Control Module Verification Test

2. U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE ALSO SET
With a scan tool, select View DTCs.
Is the DTC U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE also set?

Yes

- Perform the diagnostic procedure for U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE. U0121
- Perform AWD Control Module VERIFICATION TEST.AWD Control Module Verification Test

No

- Replace the AWD Control Module.
- Perform AWD Control Module VERIFICATION TEST.AWD Control Module Verification Test.