Engine Code BLV

Oil Pressure and Switch, Checking

Special tools, testers and auxiliary items required

• Oil Pressure Gauge (V.A.G 1342)

• Adapter for VAG 1342 (V.A.G 1342/14)

• Voltage Tester (V.A.G 1527 B)

• Connector Test Set (V.A.G 1594 C)

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

Test Conditions

• The engine oil level is OK. Checking, refer to => [ Engine Oil ] Description and Operation.

• The engine oil temperature is at least 80 °C (176 °F) (the fan must start up once).

• The selector lever must be in either the "P" or "N" position.

Oil Pressure Switch, Checking

- Remove the noise insulation.

- Remove the plug - item 8 - in the => [ Oil Filter Housing Overview ] Service and Repair from the oil filter housing.

- Seal the oil pressure switch check hole in the oil pressure gauge (V.A.G 1342) with the plug from the oil filter housing.

- Screw the adapter (V.A.G 1342/14) into the oil filter housing in place of the plug and connect the oil pressure tester (V.A.G 1342) to the adapter.

• Note the installed position of the adapter: The conical connecting neck of the adapter is connected to the pressure tester hose.

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

- Connect the voltage tester (V.A.G 1527 B) to battery positive (B+) (connection in engine compartment - arrow -) and to the oil pressure switch using adapter cables from the connector test set (V.A.G 1594 C). 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:

• While starting engine, watch the pressure tester and LED as the switch point of the oil pressure switch may already be exceeded during starting.

- Start the engine and run at idle speed. The LED must light up at 0.7 to 1.1 bar positive pressure, otherwise replace the oil pressure switch.

Oil Pressure, Checking

- Check the oil pressure at different speeds:

• 1500 RPM: at least 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 of 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 of the oil pressure relief valve is spring loaded. Therefore the highest care is required when removing the sealing plug.

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

- Pull the control piston out of the oil pump and remove and contamination, if necessary.

- Check the strainer in the suction pipe for clogging.

- Check the oil pipe on the bottom of the cylinder block for leaks. Replace the seals, if necessary.

- Correct any 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 ] Oil Pump.

If the specification is exceeded:

- Check the oil passage.

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