Self-Diagnostic System: Summary
WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Chevrolet Cavalier, 2001 Pontiac Sunfire, and 2001 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
If no hard DTCs are present, and driveability symptoms or intermittent DTCs exist, diagnose system by verifying electronic control system circuit operation. This may be accomplished by using scan tool to compare actual circuit data values to typical manufacturer specified data values. Refer to scan tool manufacturer's instruction manual.