Diagnostic Aids
WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
An intermittent DTC can also be the result of a defective reluctor wheel. Remove crankshaft sensor, and inspect reluctor wheel through crankshaft sensor mount hole. Inspect porosity and condition of reluctor wheel.
Verify that the ICM ground circuit has less than 0.5 ohms resistance.