Oil Pressure Sender: Testing and Inspection

Oil Pressure Switch and 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 1527 B)

• Connector Test Set (V.A.G 1594C)

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

Conditions

• Engine oil level OK, checking, refer to => [ Engine Oil ] Description and Operation.

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

• Selector lever must be in the "P" or "N" position.

Oil Pressure Switch, Checking

- Remove the noise insulation.

- Remove the plug - item 8 -=> [ Plug ] Service and Repair from the oil filter housing.

- Install the plug to the oil pressure switch test hole on the (V.A.G 1342).

- Install the (V.A.G 1342) with (V.A.G 1342/14) into the oil filter housing in place of the plug.

• Pay attention to the installed position of the adapter: the cone-shaped connection on the adapter is attached to the tester pressure hose.

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

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





If the LED lights up:

- Replace the oil pressure switch (F1) - item 2 -=> [ ] Service and Repair.

If the LED does not light up:

• While starting engine, watch the (V.A.G 1342) and LED as the switch point of the oil pressure switch may already be exceeded during start.

- Start the engine and run at idle speed. The LED must light up at 0.7 to 1.1 bar pressure. Replace the oil pressure switch if it does not. Refer to - item 2 -=> [ ] Service and Repair.

Oil Pressure, Checking:

- Check oil pressure at different speeds:

• 1500 RPM: minimum 1.7 bar

• 2000 RPM: 3.0 to 5.5 bar

• above 2000 RPM: maximum 7.0 bar

- If the specified values are not reached:

- First check the control piston for the oil pressure relief valve in the oil pump for contamination.

- To do so, first remove the plug from the cylinder block, then remove the plug from the oil pump.

• The control piston for the oil pressure relief valve is spring loaded. Therefore the highest care is required when removing the plug.

• The plug in the oil pump is tightened to 35 Nm.

- Pull the control piston out of the oil pump and remove any contamination as necessary.

- Check the screen inside the suction pipe - item 17 -=> [ Suction Pipe ] Oil Pan, Pump and Filter Housing Overview for dirt.

- Check the oil pipe - item 10 -=> [ Oil Pipe ] Oil Pan, Pump and Filter Housing Overview on the bottom of the cylinder block for leaks. Replace the seals - item 9 -=> [ Seal ] Oil Pan, Pump and Filter Housing Overview if necessary.

- Correct the mechanical damage, for example, bearing damage.

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

If a malfunction is found despite insufficient oil pressure:

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

If the specification is exceeded:

- Check the oil passages.

- Replace the oil pump, if necessary. Refer to => [ Oil Pump ] Service and Repair.