CAN Bus Circuit

CAN BUS CIRCUIT





POSSIBLE CAUSES
- CAN COMMUNICATION FAILURE
- CAN C BUS (+) AND/OR CAN C BUS (-) CIRCUIT OPEN
- SHIFT LEVER ASSEMBLY

Diagnostic Test
1. CHECK FOR CAN DTCS IN OTHER MODULES





Turn the ignition on.
With the DRB III*, read the stored and active DTCs for all modules on the CAN C Bus.
Are other modules reporting CAN Bus DTCs?
Yes>>Refer to the reporting category and perform the appropriate symptom. If the PCM is reporting a CAN Bus failure, refer to the PCM tests first.
No>>Go To 2

2. CAN C BUS (+) AND/OR CAN C BUS (-) CIRCUIT OPEN





Turn the ignition off.
Disconnect the PCM harness connector. Disconnect the SLA harness connector.

Note: Check connectors - Clean/repair as necessary.

Measure the resistance of both the CAN C Bus (+) circuit and the CAN C Bus (-) circuit from the PCM harness connector to the SLA harness connector.
Is the resistance of both CAN C Bus circuits below 5.0 ohms?
Yes>>Replace the Shift Lever Assembly.
Perform NAG1 TRANSMISSION VERIFICATION TEST. Verification Tests
No>>Repair the faulty CAN C Bus circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST.