Oil Pressure Sensor: Description and Operation

The engine oil pressure sensor is a resistor which changes value based on pressure and is mounted to the rear left top of the engine. Low oil pressure produces a high resistance (100,000 ohms at -38°C/-39°F) while high pressure causes low resistance (70 ohms at 130°C/266°F).

The PCM supplies a 5.0 volt signal to the oil pressure sensor through a resistor in the PCM and measures the voltage on the signal circuit. By measuring the voltage, the PCM calculates the engine oil pressure.

When the PCM detects a malfunction in the EOP sensor circuit, one of the following DTCs will set:
- DTC P0522 Engine Oil Pressure Sensor Circuit Low Voltage.
- DTC P0523 Engine Oil Pressure Sensor Circuit High Voltage.