Corsica L4-121 2.0L (1988)
Oil Pressure Gauge: Symptom Related Diagnostic Procedures
Test F: Oil Pressure Shows Low
Fuel Pump/Oil Pressure Switch Location
Check the oil pressure with a manual gauge. If the pressure is correct, continue with the electrical diagnosis.
Remove the connector from the oil pressure sender/switch. Turn the ignition switch to the RUN position.
1. If the display now shows high pressure, the wiring is good. Install a new oil pressure sender/switch.
2. If the display remains low, check for a short in the TAN(31) wire between the sender and the instrument cluster. If that wire is not shorted to ground,
replace the instrument cluster.
Test G: Oil Pressure Shows High
Fuel Pump/Oil Pressure Switch Location
Remove the connector from the oil pressure sender/switch and jumper the TAN(31) wire to ground.
1. If the display now reads low, the wiring is good. Install a new oil pressure sender/switch.
2. If the display remains high, check for an open in the TAN(31) wire back to the instrument cluster.
Test H: Oil Display Is Inaccurate
