Diagnostic Aids
WARNING: This page is about a different car, the 1994 Oldsmobile Ninety-Eight and 1994 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
An intermittent may be caused by rubbed through wire insulation. Check for:
- Boost control driver circuit shorted to ground.
- Intermittent Test
Disconnect PCM Blue connector and install a DVOM to monitor voltage between PCM harness boost control driver circuit terminal and ground. With ignition on, observe voltage while moving related connectors and wiring harness. If failure is induced, voltage reading will change.
NOTE:
Prior To Performing This Chart, Verify Presence Of At Least 15 In. Hg Vacuum To By-Pass Actuator Solenoid With Engine Idling. Also Verify Lines Are Not Plugged. Repair Any Vacuum Supply Problems.