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 or DTC U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TCM 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
1. Go to 2).
No
1. Perform the Stored Lost Communication test procedure. Refer to DIAGNOSIS AND TESTING .
2. Perform BODY VERIFICATION TEST - VER 1 .
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
1. Diagnose and repair the DTC(s). Refer to DIAGNOSTIC CODE INDEX table .
No
1. 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
1. Go to 4).
No
1. Refer to appropriate NO RESPONSE test procedure in DIAGNOSIS AND TESTING .
2. Perform BODY VERIFICATION TEST - VER 1 .
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
1. Replace/update the TCM in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Anti-Lock Brakes Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .