Diagnostic Test
- VERIFY DTC IS ACTIVE NOTE:
Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
- Turn the ignition on.
- With the scan tool, read and record ASBS DTCs.
- With the scan tool, read and record Environmental Data (EV Data).
- With the scan tool, erase ASBS DTCs.
- Cycle the ignition switch.
- With the scan tool, read ASBS DTCs.
Does this DTC reset?
Yes
- Go To 2
No
- Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.
- 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
- Go to 4 and perform the appropriate diagnostic procedure.
No
- Go To 3
- With the scan tool, read all active DTCs from all CAN C Bus modules.
- VERIFY THAT THE PCM IS ACTIVE ON THE BUS
- With the scan tool, select ECU View.
- Verify that the PCM is active on the bus.
Is the ECM active on the bus?
Yes
- Go To 4
No
- Refer to DIAGNOSIS AND TESTING and perform the No Response from PCM diagnostic procedure.
- 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 PCM?
Yes
- Replace/update the Powertrain Control Module (PCM) in accordance with the service information.
- Perform the PCM VERIFICATION TEST. Refer to the appropriate Testing & Diagnostics article in Engine Performance .
No
- Replace and program the Final Drive Control Module (FDCM) in accordance with Service Information.
- Perform the ASBS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- With the scan tool, select Network View and select Advanced.