Grand Cherokee 4WD V8-4.7L VIN N (2000)
Oil Pressure Sensor: Description and Operation
OIL PRESSURE SENSOR - PCM INPUT
The 3-wire, solid-state engine oil pressure sensor (sending unit) is located in an engine oil pressure gallery.
The oil pressure sensor uses three circuits. They are:
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A 5-volt power supply from the Powertrain Control Module (PCM)
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A sensor ground through the PCM's sensor return
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A signal to the PCM relating to engine oil pressure
The oil pressure sensor has a 3-wire electrical function very much like the Manifold Absolute Pressure (MAP) sensor. Meaning different pressures
relate to different output voltages.
A 5-volt supply is sent to the sensor from the PCM to power up the sensor. The sensor returns a voltage signal back to the PCM relating to engine
oil pressure. This signal is then transferred (bussed) to the instrument panel on either a CCD or PCI bus circuit (depending on vehicle line) to
operate the oil pressure gauge and the check gauges lamp. Ground for the sensor is provided by the PCM through a low-noise sensor return.
