Low Oil Pressure Indicator Does Not Operate Correctly
WARNING: This page is about a different car, the 1997 Oldsmobile Aurora and 1997 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition on. Use Tech 1 IPC function and read DTCs. If Tech 1 displays oil pressure sensor circuit (DTC 91), go to next step. If Tech 1 does not display oil pressure sensor circuit code, got to step 4).
- Turn ignition off. Disconnect oil pressure sensor/switch connector. Connect jumper wire between harness connector terminal "A" (Tan wire) and ground. Turn ignition on. If LOW OIL PRESSURE indicator lights, check Black and Black/White wires (Riviera) or Black/White wire (Aurora) for an open circuit or high resistance. Also check in-line connector for good terminal contact. Check oil pressure sensor/switch connector for good terminal contact at terminals "A" and "B". If all circuits are okay, replace oil pressure sensor/switch.
- If LOW OIL PRESSURE indicator does not light, check Tan/White wire for an open circuit or high resistance. Also check in-line connector for good contact at terminal E5 (Riviera) or F2 (Aurora). Also check instrument cluster connector C2 for good contact at terminal A2 (Riviera) or C3 (Aurora). If all circuits are okay, replace instrument cluster.
- Turn ignition off. Disconnect oil pressure sensor connector. Connect 2 Red leads from Gauge Tester (J-33431) to terminals "A" (Tan/White wire) and "B" (Black wire). Turn ignition on. Using Tech 1 IPC data list select OIL PRESSURE. Set tester resistance dials to zero ohms (zero psi), then to 85 ohms (120 psi) (Aurora) or open circuit (Riviera).
- If Tech 1 displays zero psi at zero ohms and 120 psi at 85 ohms (Aurora), or less than 2 psi at zero ohms and 2-6 psi at open circuit (Riviera), check oil pressure sensor/switch for good contact at terminals "A" and "B". If terminal contact is okay, replace oil pressure sensor/switch.
- If Tech 1 does not display zero psi at zero ohms and 120 psi at 85 ohms (Aurora), or less than 2 psi at zero ohms and 2-6 psi at open circuit (Riviera), check Tan/White wire for a short to ground, open circuit, or high resistance. Also check Black (Riviera) or Black/White (Aurora) wiring for an open circuit or high resistance. Check all connectors for good terminal contact. If all wiring and circuits are okay, replace instrument cluster.