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Test 47A - Repairing Oil Pressure Sending Unit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Perform TEST VER - 1A after each repair.
  1. Check engine oil level, and top off as necessary. If oil level is okay, remove oil pressure sending unit, and connect an oil pressure gauge in its place. Start engine.
  2. Allow engine to reach normal operating temperature and check oil pressure reading. If oil pressure is less than 4 psi (.28 kg/cm2 ) at idle, check engine condition. See appropriate article in ENGINES. If oil pressure is more than 4 psi (.28 kg/cm2 ) at idle, turn ignition switch to OFF position.
  3. Remove oil pressure test gauge. Reinstall oil pressure sending unit. Check oil pressure sending unit connector condition, and clean or repair connector as necessary. Reconnect oil pressure sending unit connector. If instrument cluster is not equipped with an oil gauge, go to TEST 47B.
  4. If instrument panel is equipped with an oil pressure gauge, turn ignition switch to ON position. Using DRB-II, read oil pressure sending unit voltage. If voltage less than 8 volts, go to TEST 47C. If voltage more than 8 volts, read oil pressure sending unit status using DRB-II.
  5. If DRB-II does not display OIL PRS LOW CLOSED, go to TEST 47D. If DRB-II displays OIL PRS LOW CLOSED, start engine. Using DRB-II, read oil pressure sending unit voltage. If voltage is more than 5 volts, go to TEST 47E. If voltage is less than 5 volts, read oil pressure sending unit status using DRB-II.
  6. If DRB-II does not display OIL PRS LOW OPEN, go to TEST 47F. If DRB-II displays OIL PRS LOW OPEN, turn ignition switch to OFF position. System is operating properly at this time.
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