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DTC P0523: Oil Pressure Sensor Volts High: Testing

  1. Turn ignition on. Using scan tool in SENSORS mode, read oil pressure sensor voltage. If voltage is more than 4.8 volts, go to next step. If voltage is 4.8 volts or less, go to step  6.
  2. Turn ignition off. Disconnect oil pressure sensor and PCM connectors. PCM is located in engine compartment on passenger-side inner fender panel. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Black/Light Blue wire between oil pressure sensor harness connector terminal No. 1 and PCM harness connector C1 terminal No. 4. See Figure and Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire between oil pressure sensor and PCM.
  3. Ensure ignition is off and oil pressure sensor and PCM are disconnected. Measure resistance of Gray/Yellow wire between oil pressure sensor harness connector terminal No. 2 and PCM harness connector C2 terminal No. 23. See Figure and 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.
  4. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and oil pressure sensor harness connector terminal No. 2 (Gray/Yellow wire). 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.
  5. Ensure ignition is off and oil pressure sensor is disconnected. Connect a jumper wire between oil pressure sensor harness connector terminals No. 1 (Black/Light Blue wire) and No. 2 (Gray/Yellow wire). Turn ignition on. Using scan tool in SENSORS mode, read oil pressure sensor voltage. If voltage is one volt or more, replace PCM. If voltage is less than one volt, replace oil pressure sensor.
  6. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Check for any related Technical Service Bulletins (TSBs) that may apply. Start engine. Using scan tool, monitor oil pressure sensor voltage while wiggling oil pressure sensor wiring harness and connector. If oil pressure sensor voltage changes while wiggling wiring harness, repair wiring harness or connector where wiggling caused voltage to change. If voltage does not change, no problem is indicated at this time. Test is complete.
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