Engine Oil Pressure: Testing and Inspection

Oil Pressure and Switch, Checking

=> [ Oil Pressure Switch, Checking ]

=> [ Oil Pressure, Checking ]

Special tools, testers and auxiliary items required

• Oil Pressure Gauge (V.A.G 1342)

• Voltage Tester (V.A.G 1527 B)

• Connector Test Set (V.A.G 1594 C)

• Wiring Diagram

Oil Pressure Switch, Checking

Test Conditions

• Engine oil level OK, checking. Refer to => [ Engine Oil Level, Checking ] Testing and Inspection.

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

Test Sequence

• For the functional check and servicing of the optical and acoustic oil pressure warning. Refer to and "Function and Component Selection" in the vehicle diagnostic tester.

- Disconnect the connector from the oil pressure switch.

- Remove the oil pressure switch - 2 - and then install it in the oil pressure gauge (V.A.G 1342).






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

- Connect the brown wire - 1 - from the oil pressure gauge (V.A.G 1342) to Ground (GND).

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

• The Light Emitting Diode (LED) must not light up.

If the LED lights up:

- Replace the oil pressure switch:

• Tightening specification, see - item 7 - in the => [ Oil Filter Bracket and Oil Cooler Overview ] Oil Filter Bracket and Oil Cooler Overview.

If the LED does not light up:

- Start the engine and slowly increase the engine speed:

• The LED must illuminate at between 0.55 to 0.85 bar pressure. If it does not, replace the oil pressure switch.

• Tightening specification, see - item 7 - in the => [ Oil Filter Bracket and Oil Cooler Overview ] Oil Filter Bracket and Oil Cooler Overview.

Oil Pressure, Checking

Conditions

• Checking the oil pressure switch. Refer to => [ Oil Pressure Switch, Checking ].

Test Sequence

- Increase the engine speed further.

• At 2000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure must be at least 2.0 bar.

• The oil pressure must not exceed 7.0 bar at higher engine speeds.

If the specification is not obtained:

- Replace the oil filter bracket, as necessary. Refer to => [ Oil Filter Bracket and Oil Cooler Overview ] Oil Filter Bracket and Oil Cooler Overview.

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