Caprice RWD V8-305 5.0L (1992)
Oil Pressure Warning Lamp/Indicator: Testing and Inspection
If the Oil Pressure Indicator stays lit with the engine running:
^ Check for adequate oil level. Check oil pressure with a mechanical gage.
^ Disconnect the connector to the Engine Oil Pressure Switch. If the indicator goes "OFF", install a new switch. If the indicator stays "ON",
check the TAN wire back to the Instrument Cluster terminal "31" for a short to ground. If the condition is not found, remove the Instrument
Cluster and inspect the printed circuit for a short. Also check that the printed circuit is mating properly with its connector and not shorted there.
If the Oil Pressure Indicator does not light before the engine starts, and the bulb is good, measure the resistance from the Engine Oil Pressure Switch
connector to ground.
^ If the resistance is not close to zero ohms, replace the Engine Oil Pressure Switch.
^ If the resistance is close to zero ohms, check the TAN wire back to the Instrument Cluster terminal "31" for an open. Also check that the
printed circuit has no cracks or flaws and is mating properly with its connector.
