Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet 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.