Engine Oil Pressure Indicator Flasher System Input Test
- Remove left underdash fuse/relay block. See REMOVAL & INSTALLATION . Remove driver's multiplex control unit from fuse/relay block. See Figure. Inspect connector terminal connection for bent, damaged or corroded terminals. Repair as necessary. If connections are okay, go to next step.
- Turn ignition on. Check voltage between ground and fuse/relay block connector terminal A13. See Figure. Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check for blown fuse No. 13 (15-amp) in underdash fuse/relay block or open in circuit. Repair as necessary.
- Start engine. Check voltage between ground and driver's multiplex control harness connector terminal B2 (White/Blue wire). See Figure. Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check for faulty charging system or open in circuit. See WIRING DIAGRAMS . Repair as necessary. After repairs, check system operation.
- Turn ignition off. Check continuity between ground and driver's multiplex control unit harness connector terminal C5 (Yellow/Red wire). If continuity exists, go to next step. If continuity does not exist, check for open in circuit or faulty oil pressure switch. Repair as necessary.
- Turn ignition on. Check oil light indicator. If light illuminates, go to next step. If light does not illuminate, disconnect electrical connector from oil pressure switch. Connect electrical connector to ground, light should illuminate with ignition on. If oil light does not illuminate, check for faulty indicator light bulb or open in circuit (Yellow/Red wire).
- Start engine. Check for voltage between ground and driver's multiplex control unit harness connector terminal C5 (Yellow/Red wire). Battery voltage should be present. If battery voltage is not present, check oil level, check for faulty oil pressure switch or open in Yellow/Red wire circuit. Repair as necessary.