Reading and Clearing Diagnostic Trouble Codes

1. If the concern remains after the inspection, connect the scan tool to the data link connector located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the vehicle selection cannot be entered:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position. If the scan tool still does not allow the vehicle selection to be entered, refer to the scan tool manual.

2. Carry out the DATA LINK DIAGNOSTIC TEST using the scan tool. If the scan tool responds with:
- CKT914, CKT915 or CKT70 = ALL MODULE NO RESPONSE/NOT EQUIPPED, go to Communication System Diagnostics to diagnose network concern.
- If the Powertrain Control Module (PCM) is not listed for a communication concern, turn the A/C function selector switch to OFF and execute self-test diagnostics for the PCM.







3. If any PCM Diagnostic Trouble Code DTC) are retrieved, and are related to the concern, go to the PCM DTC Index.
4. If no DTCs related to the concern are retrieved, go to the Symptom Chart. Symptom Related Diagnostic Procedures