Oil Pressure and Oil Pressure Switch, Checking

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 1527B)

• Connector test set (V.A.G 1594C)

Requirements:

• Engine oil level OK.

• Engine oil temperature at least 80 °C (radiator fan must start up once).

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

Test Sequence

• Tightening specifications => [ (Item 2) ]

- Remove oil pressure switch (F1) and screw 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 1527B) using adapter cables from connector test kit (V.A.G 1594C) to B+ and oil pressure switch. LED must not light up.

- If LED lights up, replace 1.4 bar Oil Pressure Switch (F1).

If the 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.

- Increase engine speed further. At 2000 rpm and an oil temperature of 80 °C, the oil pressure should be between 2.7... 4.5 bar.

At higher engine speeds oil pressure must not exceed 7.0 bar

If the specification is not obtained:

- Check screen in oil intake pipe for soiling => [ (Item 17) Suction line ] .

• Also, mechanical damage e.g. bearing damage can also be the cause of too low oil pressure.

If no malfunction can be found:

- Replace oil pump => [ Oil Pump, Removing and Installing ] .

If the specification is exceeded:

- Check oil channels.