With Scan Tool
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Connect scan tool. Turn ignition on. Select INSTRUMENT PANEL MODULE, select SPECIAL FUNCTIONS, select MISCELLANEOUS TEST and select RECALIBRATE ALL MOTORS. Select ON and wait 30 seconds. All counts will display zero and slowly the scan tool will begin to show counts.