Test 70A - Oil Pressure Switch Sense Circuit Short To Ground
NOTE:
Perform TEST 58A
before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION
. For wiring schematics, see WIRING DIAGRAMS
in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE
after each repair.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.
- Turn ignition on. If oil warning lamp does not illuminate, go to TEST 70B . If oil warning lamp illuminates, turn ignition off. Check engine oil level. Adjust oil level if necessary. If oil level is within specification, go to next step.
- Remove oil pressure switch. Switch is located on lower left side of engine. Connect hand-held oil pressure gauge in place of switch and start engine. If gauge reading is less than 4 psi (.28 kg/cm2 ) at idle, check mechanical condition of engine for low oil pressure. Repair as necessary. If gauge reading is 4 psi (.28 kg/cm2 ) or more at idle, go to next step.
- Allow engine to reach normal operating temperature. If gauge reading is less than 4 psi (.28 kg/cm2 ) with warm engine and at idle, check mechanical condition of engine for low oil pressure. Repair as necessary. If gauge reading is 4 psi (.28 kg/cm2 ) or more with warm engine and at idle, go to next step.
- Check if oil pressure warning lamp is off. If oil pressure warning lamp is off, replace oil pressure switch. If oil pressure warning lamp is on, go to next step.
- Turn ignition off. Disconnect instrument cluster Gray connector. Using scan tool in ohmmeter mode, measure resistance at terminal No. 5 (Gray wire) on instrument cluster Gray connector. If resistance is less than 5 ohms, repair short to ground in Gray wire. If resistance is 5 ohms or greater, repair or replace instrument cluster as necessary. See appropriate INSTRUMENT PANEL article in the ACCESSORIES & ELECTRICAL section.