Oil Pressure Sensor: Description and Operation

Engine Oil Pressure Switch:

DESCRIPTION
The PCM monitors the Engine Oil Pressure Switch signal to determine if engine oil pressure is OK. If the PCM determines that a low oil pressure condition exists, the PCM will communicate the information over the Class II circuit to the Body Function Controller (BFC).


OPERATION
The PCM commands the Low Oil Level Lamp ON if the engine oil level sensor indicates that a low oil level condition exists. The PCM determines whether or not to test for low oil level based on the difference between engine coolant temperature at the last shutdown and engine coolant temperature at startup. This is to ensure that the oil has drained back into the oil pan before testing.