Grand Cherokee 2WD L6-4.0L VIN S (1997)
Oil Pressure Sensor: Description and Operation
CIRCUIT OPERATION
The oil pressure sensor is a variable resistor. A change in engine oil pressure changes the resistance in the sending unit which alters the signal
sensed by the Powertrain Control Module on circuit G6. Circuit G6 connects to cavity B23 of the PCM.
The PCM provides ground for the oil pressure sensor on circuit K4. Circuit K4 connects to cavity A4 of the PCM.
The PCM broadcasts the oil pressure data on the CCD bus. The micro-processor in the instrument cluster receives the signal from the CCD bus,
calculates oil pressure and adjusts the gauge needle position.
The Body Control Module (BCM) also receives the oil pressure data broadcast by the PCM on the CCD bus. If oil pressure drops below a
calibrated pressure, the BCM sounds an audible chime and illuminates the oil pressure warning lamp.
OIL PRESSURE SENSOR-PCM INPUT
Sends a signal from the oil pressure sending unit to the Powertrain Control Module (PCM) relating to engine oil pressure.
