Oil Pressure Sensor
WARNING: This page is about a different car, the 2003 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
See illustrations for oil pressure sensor location. See Fig 1 or Fig 2 . The oil pressure sensor is a solid-state sending unit. The sensor uses 3 circuits: 5-volt power supply, sensor ground and sensor signal. The sensor signal circuit varies with engine oil pressure. This signal is transferred "bussed" to the instrument panel on either a CCD or PCI bus circuit (depending on vehicle line). The transferred signal is used to operate oil pressure gauge and CHECK GAUGES light. Ground for the sensor is provided by the PCM through a low-noise sensor return.