Engine Oil Pressure Switch

Engine Oil Pressure Switch

Oil pressure switches are typically used as an actuator which directly activates the oil warning light in driver dashboard when the oil pressure in the engine will fall below the preset critical level or brings a signal to the ECU (engine control unit), so to be warned about low pressure of engine oil and prevent damage to the engine.

Depending on the engine construction, the oil pressure switch usually can be found in one of the most common locations: in the cylinder block of the engine or in the oil filter housing as well as at some engine types can be found in the engine head.

Diagnostics and Testing Procedures for Engine Oil Pressure Switch
Switch with Normally Open Contacts
Check that there is an open circuit between the contacts when the engine is not running.
Check that there is a short circuit (continuity) between the contacts when the engine is running.
Check the continuity and condition of the pins, terminals and wires.