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DTC P0523: Oil Pressure Sensor Volts High: Testing

  1. Turn ignition on, with engine off. Using scan tool, read oil pressure sensor voltage. If voltage is 4.8 volts or less, go to step  6 . If voltage is more than 4.8 volts, go to next step.
  2. Turn ignition off. Disconnect oil pressure sensor connector. Oil pressure sensor is located on right side of engine near distributor (2.5L) or camshaft position sensor (4.0L) and has a Black 3-pin connector. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, turn ignition on, with engine off. Measure voltage between ground and Gray/Yellow wire at oil pressure sensor connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair short to voltage in Gray/Yellow wire between oil pressure sensor and PCM.
  3. Connect a jumper wire between Gray/Yellow wire and Brown/Yellow wire at oil pressure sensor connector. Turn ignition on, with engine off. Using scan tool, read oil pressure sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace oil pressure sensor.
  4. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment on left front fender, near radiator support. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance Gray/Yellow wire between oil pressure sensor connector and terminal No. 23 at PCM C2 connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Yellow wire between oil pressure sensor and PCM.
  5. At this time, PCM is assumed to be defective. Replace PCM.
  6. Ensure ignition is still on, with engine off. Using scan tool, monitor oil pressure sensor voltage while wiggling oil pressure sensor wiring harness and connector. Oil pressure sensor is located on right side of engine near distributor (2.5L) or camshaft position sensor (4.0L) and has a Black 3-pin connector. If oil pressure sensor voltage changes while wiggling wiring harness, repair wiring harness or connector where wiggling caused voltage to change. If oil pressure sensor voltage does not change, go to next step.
  7. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, go to next step.
  8. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Visually inspect related connectors for corroded, damaged, pushed-out or miswired terminals. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0523: OIL PRESSURE SENSOR HIGH returns, repeat test. If DTC P0523: OIL PRESSURE SENSOR HIGH does not return, no problem is indicated at this time. Test is complete.
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