Test Description
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- This step determines if the scan tool is receiving power through the DLC connector.
- The MIL should illuminate whenever the ignition is ON and the engine is not running.
- This step determines if the PCM is transmitting class 2 serial data to the DLC and that the class 2 data circuit is not open or shorted.
- This step determines if a DTC is current or stored in history.