LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Electrical >> Gauges >> Displays And Gages >> Diagnostic Information and Procedures >> Engine Oil Pressure Gage Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EOP sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 1 and ground.
    • If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM.
    • If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.4 volt.
    • If greater than 0.4 volt, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Install a 3-amp fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 3. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.6 volts.
    • If less than 4.6 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  6. Ignition ON, perform the engine oil gage sweep test with the scan tool.
    • If the engine oil pressure gage does not sweep from its low to high position, replace the IPC.
  7. If all circuits test normal, test or replace the EOP sensor.
scientia non olet · About LEMON Manuals