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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Chevrolet Monte Carlo and 2007 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.
    • If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the engine control module (ECM).
  3. Ignition ON, test for 4.8 - 5.2 volts between the 5-volt reference circuit and ground.
    • 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 and the low reference circuit. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 4.8 volts.
    • If greater than 4.8 volts, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the EOP sensor.
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