Test Description

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

1

This step determines if the scan tool is receiving power through the DLC connector.

2

The MIL should illuminate whenever the ignition is on and the engine is not running.

3

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.

4

This step determines if a DTC is current or stored in history.