Oil Pressure Gauge
- If oil pressure gauge indicates low pressure when oil pressure is normal, proceed to step 2). If oil pressure gauge indicates high pressure at all times, proceed to step 3). If oil pressure gauge is inaccurate, proceed to step 4).
- Turn ignition switch to the "RUN" position. Disconnect oil pressure sending unit connector. Oil pressure gauge should show high pressure. If so, replace oil pressure sending unit. If not, check Tan wire for short to ground. If wire is okay, replace oil pressure gauge.
- With ignition switch in the "RUN" position and oil pressure sending unit connector disconnected, install a fused jumper wire between Tan wire and ground. Oil pressure gauge should show low oil pressure. If so, replace oil pressure sending unit. If not, check Tan wire and instrument cluster printed circuit for an open. If both are okay, replace oil pressure gauge.
- Disconnect oil pressure sending unit. Install Tester (J-33431) between Tan wire and ground. Set resistance values to "0" ohms and then to "90" ohms.
- The oil pressure gauge should read low pressure and then high pressure. If so, replace oil pressure sending unit. If not, check Tan wire, gauge connections and printed circuit. If okay, replace oil pressure gauge.