Circuit Description

When the oil pressure is above 4.5 psi, the oil pressure switch opens, and the engine control module (ECM)/powertrain control module (PCM) senses a high signal voltage. The ECM/PCM monitors the oil pressure switch signal circuit and sends a class 2 message to the instrument panel cluster (IPC) indicating the switch status. When the engine oil pressure (EOP) is low, the EOP switch closes, the signal circuit is low DTC P0520 sets.