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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 step  6.
  2. Turn the ignition off. Disconnect the Oil Pressure Sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the Oil Pressure Sensor Signal circuit from the PCM harness connector to the Oil Pressure Sensor harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Oil Pressure Sensor Signal circuit for an open.
  3. Turn the ignition off. Reconnect PCM connectors. Install a jumper wire between the Sensor Signal circuit, and Sensor Ground circuit at the Sensor harness connector. Turn ignition on, engine not running. With the DRBIII® in Sensors, read the Oil Pressure Sensor voltage. Is the voltage below 1.0 volt? If yes, replace the Oil Pressure Sensor. If no, go to next step.
  4. Turn the ignition off. Ensure Oil Pressure Sensor is disconnected. Disconnect the PCM harness connectors. Measure the resistance of the Oil Pressure Sensor ground circuit from Oil Pressure Sensor harness connector to the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Oil Pressure Sensor ground circuit for an open.
  5. Turn ignition on, engine not running. Using a 12-volt test light connected to ground, check the Oil Pressure Sensor Signal circuit at the Oil Pressure Sensor harness connector. Is the test light illuminated and bright? If yes, repair the Oil Pressure Sensor Signal circuit that is shorted to voltage. If no, replace PCM. Program the new PCM. See PROGRAMMING .
    6. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  6. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. With the DRBIII® as a Dual Channel Lab Scope and the Miller Special Tool (6801), backprobe the Oil Pressure Signal circuit at the Sensor connector and the PCM connector. Start the engine and look for any differences in the two patterns. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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