ABS

U0101-LOST COMMUNICATION WITH TCM

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- Set Condition:
If the Anti-Lock Brakes Module fails to receive bus messages from the TCM for approximately 500 ms.





Diagnostic Test

1. VERIFY DTC IS ACTIVE
NOTE: Verify the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

NOTE: If present, diagnose and repair DTC U0002-CAN C BUS OFF PERFORMANCE, DTC or DTC U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TIPM before diagnosing this DTC.

Turn the ignition on.
With the scan tool, read and record ABS DTCs.
With the scan tool, read and record Environmental Data (EV Data).
With the scan tool, erase ABS DTCs.
Cycle the ignition switch.
With the scan tool, read ABS DTCs.
Does this DTC reset?

Yes

- Go to 2

No

- Perform the Stored Lost Communication test procedure. Stored Lost Communication DTCs.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
With the scan tool, read all active DTCs from all CAN C Bus modules.

NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs related to the conditions listed above?

Yes

- Diagnose and repair the DTC(s).

No

- Go to 3

3. VERIFY THAT THE TCM IS ACTIVE ON THE BUS
With the scan tool, select ECU View.
Verify that the TCM is active on the bus.
Is the TCM active on the bus?

Yes

- Go to 4

No

- Refer to Manufacturer Trouble Codes for a no response test procedure.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTCs "Logged Against" the TCM?

Yes

- Replace/update the TCM.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Replace the Anti-Lock Brakes Module.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.