Possible Causes & Corrections

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.

Check for poor mating of one connector to another. Terminals may not be fully seated. Check for improperly formed or damaged terminals. Check wire-to-terminal connections.
Check for poor connection from ignition coil to ground or arcing at spark plug wires or plugs.
Check for poor connections at integration module ground terminals.
Check for electrical system interference caused by defective relay, module-driven solenoid or switch, which may cause sharp electrical surge. This type of problem will normally occur when problem component is operated.
Check for aftermarket parts which may not have been produced to manufacturer specifications. Solenoids without original equipment diodes for circuit protection or voltage regulators using transistors instead of silicone-chip circuitry may cause voltage surges (up to 300 volts) in integration module wiring, causing temporary integration module shutdown. integration module shutdown is a normal response to system over voltage (over 16 volts on most models). integration module re-powers when condition ceases to exist. A rapid shutdown and re-power could cause a flickering MIL with no DTCs set in memory.
Check for improper installation of electrical accessories such as auxiliary lights, cell phones or 2-way radios.
Ensure ground wire from integration module to distributor or ignition module is connected to a good ground.
Check for intermittent short to ground on data circuits of DLC. See WIRING DIAGRAMS .