On-Board Diagnostic (OBD) with Scan Tool

WARNING: This page is about a different variant/trim than selected.

These self-tests should be used to diagnose the PCM and should be carried out in order.

NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC to the VCM .
If the scan tool does not communicate with the VCM :
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM .
- refer to MODULE COMMUNICATIONS NETWORK article to diagnose no power to the scan tool.
If the scan tool does not communicate with the vehicle:
- verify the ignition is in the RUN position.
- verify scan tool operation with a known good vehicle.
- refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the PCM.
Carry out the network test.
- If the scan tool responds with no communication from one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
- If the network test passes, retrieve and record the continuous memory DTCs.
Clear the continuous DTCs and carry out the PCM self-test.
If DTCs retrieved are related to the concern, Go to the DTC CHART .
If no DTCs related to the concern are retrieved, Go to DIAGNOSIS BY SYMPTOM in this service information.