Grand Cherokee 4WD V8-4.7L Flex Fuel (2009)
Oil Pressure Switch (For Fuel Pump): Description and Operation
Oil Pressure Switch - Operation
OPERATION
The oil pressure switch is normally "Closed." The switch changes from a "Closed" circuit to an "Open" circuit, on increasing pressure of 7 psig. The oil
pressure switch changes from an "Open" circuit to a "Closed" circuit, on decreasing pressure, between 2 psig and 4 psig.