Oil Pressure Switch (For Fuel Pump): Testing and Inspection

Oil pressure and oil pressure switch, checking





Special tools, testers and auxiliary items required

^ Oil pressure gauge V.A.G 1342
^ Voltage tester V.A.G 1527 B
^ Connector test set V.A.G 1594 C

Test requirements

^ Engine oil level OK, checking.
^ Oil pressure warning lamp must light up for approx. 3 seconds when ignition is switched on
^ On vehicles with Auto-Check-System, the indicator "O.K." must light up (check symbol).
^ Engine oil temperature at least 80 degrees C (radiator fan must start up once)

Note:
^ Function test and servicing the optical and acoustic oil pressure indicator: wiring diagrams, "Function and Component Selection".

Test sequence





- Remove Oil Pressure Switch F1 -A- and install it into oil pressure gauge.
- Thread oil pressure gauge into oil filter bracket in place of oil pressure switch.
- Connect brown wire of tester to Ground (GND).
- Connect voltage tester V.A.G 1527 B using adapter cables from connector test set V.A.G 1594 C to battery B+ and oil pressure switch F1 -B-. LED must not light up.
- If LED lights up, replace 1.4 bar oil pressure switch.

If LED does not light up:

- Start engine and increase engine speed: LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch F1.
- Increase engine speed further. At 2000 rpm and an oil temperature of 80 degrees C, the oil pressure should be between 2.7 to 4.5 bar.

Torque specifications