U1120

U1120-LOST WHEEL DISTANCE MESSAGE





For a complete wiring diagram refer to Diagrams/Electrical.


Theory of Operation


The PCM receives the vehicle speed signal over the CAN C bus from the Anti-lock Brake Module.

- When Monitored:

Ignition on.

- Set Condition:

The PCM doesn't receive a wheel distance message from the Anti-lock brake Module over the CAN C bus.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.


Diagnostic Test


1. ACTIVE DTC

Ignition on, engine not running.

With the scan tool View Powertrain DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition


2. U0121-LOST COMMUNICATION WITH ABS MODULE/P0141-LOST COMMUNICATION WITH FCM (TIPM) ALSO SET

With the scan tool, read the appropriate module for DTCs.

Is the U0121-LOST COMMUNICATION WITH ABS MODULE/P0141-LOST COMMUNICATION WITH FCM (TIPM) also set?

Yes

- Perform the appropriate diagnostic test.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test