Note On Intermittents
WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
With key on, backprobe ECM terminal D8 to ground with a 12-volt test light. The light should remain in ON position unless steering is turned to full lock. Manipulate power steering pressure switch connector, circuit No. 495 wiring and ECM D8 connector, while observing test light. If light goes out, repair intermittent open or short to ground.