Test 70A - Oil Pressure Switch Sense Circuit Short To Ground
NOTE:
For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER
section in this article. Perform TEST VER-1
VERIFICATION TEST 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, check resistance on instrument cluster Gray connector terminal No. 5 (Gray wire). 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 INSTRUMENT PANEL article.