Engine Oil Pressure: Testing and Inspection

Oil Pressure and 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)

• Socket 24 mm and Jointed Extension (T40175)

Requirements:

• Engine oil level OK

• Engine oil temperature at least 80 °C (176 °F) (radiator fan must start up once).

• Function test and servicing the optical and acoustic oil pressure indicator, refer to wiring diagrams, vehicle diagnostic tester "Function and Component Selection".

Test Sequence:

• Tightening specification, see => [ (Item 2) ] Service and Repair.

- Remove the oil pressure switch (F1) and install it into the oil pressure gauge.






- Thread the oil pressure gauge into the oil filter bracket in place of the oil pressure switch.

- Connect the brown wire on the tester to the ground (-).

- Connect the voltage tester (V.A.G 1527B) using adapter cables from the connector test kit (V.A.G 1594C) to B+ and the oil pressure switch. The Light Emitting Diode (LED) must not light up.

- If the LED lights up, replace the oil pressure switch.

If the LED does not light up:

- Start the engine and increase the engine speed: The LED must illuminate at 1.2 to 1.6 bar. Replace the oil pressure switch if it does not.

- Increase the engine speed further. At 2000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure must be between 2.7 and 4.5 bar.

At higher engine speeds the oil pressure must not exceed 7.0 bar

If the specification is not obtained:

- Check the screen in the oil intake pipe => [ (Item 22) Oil Intake Pipe ] Oil Pan and Oil Pump Overview for contamination.

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

If no malfunction can be found:

- Replace the oil pump. Refer to => [ Oil Pump ] Oil Pump.

If the specification is exceeded:

- Check the oil passages.