Oil Pressure and Switch, Checking

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)

• Engine oil level OK

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

• For the functional check and servicing of the optical and acoustic oil pressure warning. Refer to wiring diagrams and to vehicle diagnosis, testing and information system VAS 5051 "Function and Component Selection".

- Remove the oil pressure switch (F1) and install it into the (V.A.G 1342).





- Thread the (V.A.G 1342) into the oil filter bracket in place of the oil pressure switch.

- Connect the brown wire on the (V.A.G 1342) to ground (-).

- Connect the (V.A.G 1527B) using adapter cables from the (V.A.G 1594C) to the battery positive B+ and the oil pressure switch. Light Emitting Diode (LED) must not light up.

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

If the LED does not light up:

- Start the engine and increase the RPM: the LED must come on at 1.2 to 1.6 bar pressure; if not, then replace the oil pressure switch.

- Increase 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 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 ] Service and Repair 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 one of the following:

Engine codes BGP and BGQ, refer to => [ Oil Pump ] Service and Repair.

Engine codes CBTA and CBUA, refer to => [ Oil Pump ] Service and Repair.

If the specification is exceeded:

- Check the oil passages.

- If necessary, replace the oil filter bracket with pressure relief valve.