Circuit Description

The engine oil pressure (EOP) sensor is mounted in the top rear of the engine. The EOP sensor measures changes in engine oil pressure. The EOP sensor has a 5-volt reference, a ground and a signal circuit. The EOP sensor changes resistance based on engine oil pressure and is used to determine when the oil pressure is below a certain threshold. When the oil pressure reaches a predetermined value, the powertrain control module (PCM) will determine this as high oil pressure. The PCM will then send a serial data message to the instrument panel (I/P) cluster to activate the Check Oil warning indicator. When the PCM senses a signal voltage higher than the normal operating range of the sensor, this DTC P0523 will set.