Diagnostic Aids
WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
With ignition off, check for short to voltage in Red wire between generator and PCM. If DTC B1488 is a history code, the problem may be intermittent. Perform test procedures while wiggling associated harness and connectors. Repair as necessary.