Test B: Engine Oil Pressure Gauge Inaccurate Or Inoperative

If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
Start engine and observe engine oil pressure gauge on IPC. If engine oil pressure gauge indicates between 10 and 70 psi, system is functioning properly at this time. Check wiring and connectors in circuit for possible intermittent fault. See WIRING DIAGRAMS . If engine oil pressure gauge does not indicate between 10 and 70 psi, go to next step.
Turn ignition switch to OFF position. Disconnect engine oil pressure sensor electrical connector. Turn ignition switch to ON position. If engine oil pressure gauge indicates more than 80 psi, go to next step. If engine oil pressure gauge does not indicate more than 80 psi, go to step 6 .
Turn ignition switch to OFF position. Connect fused jumper wire (3-amp) between engine oil pressure sensor signal circuit (Tan/White wire) and ground. If engine oil pressure gauge indicates 0 psi, go to step 7 . If engine oil pressure gauge does not indicate 0 psi, go to next step.
Check Tan/White wire between engine oil pressure sensor and IPC connector terminal A2. See Figure . See WIRING DIAGRAMS . Check wiring for open, high resistance or short to voltage. Repair circuit as necessary, then go to step 12 . If no problem is found, go to step 9
Check Tan/White wire between engine oil pressure sensor and IPC connector terminal A2. See Figure . See WIRING DIAGRAMS . Check wiring for short to ground. Repair circuit as necessary, then go to step 12 . If no problem is found, go to step 9
Inspect engine oil pressure sensor case to ground connection for poor contact or corrosion. Repair connection as necessary, then go to step 12 . If no problem is found, go to next step.
Check engine oil pressure sensor electrical connection for poor connection or a corroded terminal. Repair connection as necessary, then go to step 12 . If no problem is found, go to step 10 .
Check IPC connector for poor connection or corroded terminals. Repair connection as necessary, then go to step 12 . If no problem is found, go to step 11 .
Replace engine oil pressure sensor. When repair is complete, go to step 12 .
Replace IPC. See INSTRUMENT PANEL CLUSTER under REMOVAL & INSTALLATION. When repair is complete, go to next step.
Operate system and verify proper operation of engine oil pressure gauge. If engine oil pressure gauge operates properly, repair is complete. If engine oil pressure gauge is inaccurate or inoperative, go to step 2 .