Oil Temperature Sensor/Switch: Testing and Inspection

Oil Pressure and Oil Pressure Switch, Checking

--> [ Oil Pressure Switch, Checking ]

--> [ Oil Pressure, Checking ]

Special tools, testers and auxiliary items required

• Oil pressure gauge (V.A.G 1342)

• Adapter (V.A.G 1342/14)

• Voltage tester (V.A.G 1527B)

• Connector test set (V.A.G 1594C)

• Wiring diagram

• Function test and servicing the optical and acoustic oil pressure indicator:

Oil Pressure Switch, Checking

Test Conditions

• Engine oil level OK, checking --> [ Oil Dipstick Markings ] Description and Operation.

• Engine oil temperature at least 80° C (radiator fan must have run once)

• For vehicles with automatic transmission, selector lever must be in position "P" or "N".

Procedure

- Remove oil pressure switch (F1) --> [ (Item 6) , 20 Nm ] Service and Repair and screw in oil pressure gauge.





- Screw oil pressure gauge (V.A.G 1342) with adapter (V.A.G 1342/14) into oil filter bracket in place of oil pressure switch --> [ (Item 6) , 20 Nm ] Service and Repair.

• Observe installation position of adapter (V.A.G 1342/14): The conical connection of the adapter is threaded in with the pressure hose of the oil pressure gauge (V.A.G 1342).

- Connect brown wire of oil pressure gauge (V.A.G 1342) to ground (-).

- Connect voltage tester (V.A.G 1527B) using adapter cables from connector test set (V.A.G 1594C) to battery B+ and oil pressure switch (F1). LED must not light up.

If the LED lights up:

- Replace the oil pressure switch (F1) --> [ (Item 6) , 20 Nm ] Service and Repair.

If the LED does not light up:

- Start the engine and run at idle speed.

LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch (F1) --> [ (Item 6) , 20 Nm ] Service and Repair.

Oil Pressure, Checking

Test Conditions

• Engine oil level OK, checking --> [ Oil Dipstick Markings ] Description and Operation.

• Engine oil temperature at least 80° C (radiator fan must have run once)

• For vehicles with automatic transmission, selector lever must be in position "P" or "N".

Procedure

- Check oil pressure at different speeds:

• 1500 RPM: at least 1.7 bar

• 2000 RPM: 3.0 to 5.5 bar pressure

• Above 2000 RPM: maximum 7.0 bar

If the specified values are not reached:

- Examine the filter intake for contamination.

- Examine the pressure pipe between oil pump and cylinder block for tightness.

• Check for mechanical damage, e.g. bearing failures that can cause low oil pressure.

If a malfunction is found despite insufficient oil pressure:

- Replace the oil pump --> [ Oil Pump, Assembly Overview ] Service and Repair.

The oil pressure must not exceed 7.0 bar.

If 7.0 bar is exceeded:

- Check oil channels.

Possibly the oil pressure relief valve in the oil pump is plugged.

- Replace oil pump.