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DTC P0523: Oil Pressure Sensor Volts High: Testing

  1. Turn ignition on, engine not running. With the DRBIII® in Sensors, read the Oil Pressure Sensor voltage. Is the Oil Pressure Sensor voltage above 4.8 volts? If yes, go to next step. If no, go to INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the Oil Pressure Switch harness connector. Turn ignition on, engine not running. Connect a jumper wire to the (G60) Oil Pressure Signal circuit in the Switch harness connector. With the DRBIII® monitor the Oil Pressure Switch state. Touch the other end of the jumper wire to the ground circuit at the Oil Pressure Switch harness connector several times. Did the Oil Pressure Switch state change from High to Low? If yes, replace the Oil Pressure Switch. If no, go to the next step.
  3. Turn the ignition off. Disconnect PCM harness connectors. Turn ignition on, engine not running. Measure the voltage on the (G60) Oil Pressure Signal circuit at the Switch harness connector. Is the voltage above 5.3 volts? If yes, repair the short to voltage on the (G60) Oil Pressure Signal circuit. If no, go to next step.
  4. Turn the ignition off. Measure the resistance of the (G60) Oil Pressure Signal circuit from the Oil Pressure Switch harness connector to the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to the next step. If no, repair the open in the (G60) Oil Pressure Signal circuit.
  5. Measure the resistance between (G60) Oil Pressure Signal circuit and ground at the Switch connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (G60) Oil Pressure Signal circuit. If no, go to the next step.
    6. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage, or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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