No CAN Communications With TCM

NO CAN COMMUNICATIONS WITH TCM





When Monitored and Set Condition
^ When Monitored: With the ignition on.
^ Set Condition: CAN Bus communication failure between the Controller Antilock Brake (CAB) and the Transmission Control Module (TCM).





For a complete Electronic Stability Program (ESP) Circuit Diagram refer to Diagrams; Electrical.

Diagnostic Test
1. MEASURE THE RESISTANCE OF THE CAN C BUS (+) CIRCUIT
Turn the ignition off.
Disconnect the CAB harness connector.
Disconnect the TCM harness connector.

Note: Check connectors - Clean/repair as necessary.





Measure the resistance of the CAN C Bus (+) circuit from the CAB harness connector to the TCM harness connector.
Is the resistance below 1.0 ohm?
Yes >> Go to 2
No >> Repair the CAN C Bus (+) circuit for an open. Perform ABS VERIFICATION TEST. ABS Verification Test

2. MEASURE THE RESISTANCE OF THE CAN C BUS (-) CIRCUIT
With the ignition off.





Measure the resistance of the CAN C Bus (-) circuit from the CAB harness connector to the TCM harness connector.
Is the resistance below 1.0 ohm?
Yes >> Replace the Controller Antilock Brake. Perform ABS VERIFICATION TEST.
No >> Repair the CAN C Bus (-) circuit for an open. Perform ABS VERIFICATION TEST.