Integrated Diagnostic System Scan Tool Usage

If The Integrated Diagnostic System Scan Tool Does Not Communicate With The Vehicle Communication Module 

1. Check the Vehicle Communication Module power; examine the connection to the vehicle.
   • The Vehicle Communication Module LED illumination prove-out confirms power and ground from the Data Link Connector are provided to the Vehicle Communication Module.
   • Recommended Practice: 

     For additional information, refer to: COMMUNICATIONS NETWORK to diagnose no power to the Vehicle Communication Module .

2. Check the scan tool connection to the Vehicle Communication Module.
3. Follow scan tool instructions to retry.

If The Integrated Diagnostic System Scan Tool Does Not Communicate With The Vehicle 

The Integrated Diagnostic System scan tool first attempts to communicate with the PCM. After establishing communication with the PCM, the scan tool then attempts to communicate with all other modules on the vehicle.

1. Verify the scan tool operation with a known good vehicle.
2. Verify the ignition is ON.
3. If an Integrated Diagnostic System session cannot be established with the vehicle (Integrated Diagnostic System may state "No communication can be established with the PCM"):
   • Choose "NO" when the scan tool prompts to retry communication.
   • Enter either a PCM part number, tear tag, or calibration number to identify the vehicle and start a session.
     • The PCM part number and 4-character tear tag are printed on the PCM label.
   • Establish a session based on the PCM information (above).
4. Using the tool box menu, run the network test.
   • Determine if all modules on the network are unresponsive or if only the PCM does not communicate.
   • Recommended practice: 

     For additional information, refer to: COMMUNICATIONS NETWORK to view Symptom Chart and diagnose the network outage or no response from the PCM.