Oil Pressure Sensor: Testing and Inspection

*** UPDATED BY TSB 91-6-24, DATED FEBRUARY 1991

ECM Wiring Diagram (1 of 4):

The oil pressure switch is mounted on the engine. This switch operates as a parallel power supply with the fuel pump relay to supply battery voltage to the fuel pump. Voltage is supplied to the fuel pump after approximately 28 kPa (4 PSI) oil pressure is reached.