Checking the oil pressure switch sensor (Mitsubishi Lancer 3)

The oil pressure switch is screwed into the engine block behind the generator. When the engine is running and the oil pressure is high enough (above approximately 0.7 bar), the switch is triggered and disconnects the electrical circuit of the control lamp. The lamp does not light. When the oil pressure drops below 0.7 bar, the switch returns to its original position and connects the electrical circuit of the control lamp. The lamp lights up.

Check in installed state

Turn off the engine. Remove the wire from the oil pressure switch.



Connect an ohmmeter between the oil pressure switch contact and the engine block. The resistance should be 0 0m.

Start the engine and let it idle. The instrument should show ∞.

If one of the two measurements does not measure the required value, replace the oil pressure switch. If both measurements are normal, check the electrical wire going to the test lamp, see item 23.1.

Connect the wire to the oil pressure switch.

Checking the removed oil pressure switch

Connect an ohmmeter between the contact and the body of the oil pressure switch. The resistance should be 0 Ohm. Otherwise, replace the switch.





Insert a thin needle into the oil hole of the switch and press lightly. The device should show ∞. Otherwise, replace the switch.

Using an air pump, set the pressure at the oil hole of the switch to 0.5 bar. The resistance should be 0 Ohm. During this test, care must be taken to ensure that air is released. Failure to do so will damage the switch membrane. Replace a leaky valve.