Engine Oil Pressure Switch

The PCM applies B+ through a pull up resistor to the engine oil-pressure switch circuit. The PCM monitors the applied voltage on the engine oil-pressure switch circuit. If the ignition switch is turned on with the engine not running or if the engine oil pressure is less than 35 kPa (5 psi), the engine oil-pressure switch grounds the PCM voltage input. The PCM sends the engine oil pressure information by Class 2 serial data to the Instrument Panel Cluster (IPC). The PC controls the engine oil-pressure indicator.