U113C

U113C-LOST WHEEL SPEED MESSAGES

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The ABS communicates with other controllers over the CAN C bus. The DTCM continuously monitors the bus activity and receives the messages it needs.

- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- Set Condition:
The Drive Train Control Module (DTCM) does not receive a vehicle wheel speed signal from the Anti-lock Brake (ABS) Module over the CAN C bus.





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.

1. Ignition on, engine not running.
2. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. . Intermittent Condition Test

2. U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE ALSO SET
1. With a scan tool, read 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.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

No

- Replace the Drive Train Control Module (DTCM). Drivetrain Control Module - Removal.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.