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Circuit/System Testing

IMPORTANT: Do not turn the key to the crank position or engage the starter at any time during diagnosis.
  1. Ignition OFF, disconnect the engine oil pressure (EOP) switch connector.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
    • If not Low, test the circuit for a short to voltage or an open/high resistance. If circuit test normal, replace the ECM.
  4. If all circuits test normal, replace the engine oil pressure switch.
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