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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Low Engine Oil Level Indicator Always On >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector of the engine oil level switch.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Install a 3-amp fused jumper wire between the signal circuit and ground. Verify the scan tool Engine Oil Level Switch parameter is OK.
    • If not OK, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, test or replace the engine oil level switch.
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