GM Service Manual Online
For 1990-2009 cars only

Scan Tool Method

Refer to the scan tool's user manual for more information on the operation and usage of the scan tool.

Ignition Cycle Default

If no diagnostic trouble codes (DTCs) occur for 100 drive cycles, any existing DTCs are automatically cleared from the instrument cluster. A drive cycle occurs when the ignition is turned to the ON position and the vehicle is driven faster than 16 km/h (10 mph).