Engine Lubrication: Testing and Inspection

Oil Pressure And Oil Pressure Switches, Checking

For functional testing and repair of the optical (warning light) and acoustic (warning buzzer) oil pressure warning systems: refer to Diagrams, Diagnostic Aids.

Special tools. testers and auxiliary items
^ VAG 1342 oil pressure tester
^ VAG 1527B voltage tester
^ WV 1594 connector test kit

Checking





- Remove 0.3 bar oil pressure switch F22 (brown insulation) and install in VAG 1342 tester.

- Connect tester to cylinder head or oil filter bracket in place of 0.3 bar oil pressure switch.

- Connect brown wire -3- from tester to ground.

- Connect VAG 1527B voltage tester between battery positive (B+) and 0.3 bar oil pressure switch -A-, using adapter cables from WV 1594 connector test kit.

^ LED must light up

- Start engine and increase RPM slowly.

^ At 0.15-0.45 bar (2.1-6.5 psi) the LED must go out

If NO:

- Replace 0.3 bar oil pressure switch.

- Connect voltage tester to 1.8 bar oil pressure switch (white insulation) -B-.

^ At 1.6-2.0 bar (23-29 psi) LED must light up

If NO:

- Replace 1.8 bar oil pressure switch.

- Increase engine speed further.

^ At 2000 RPM and oil temperature at least 80 °C (176°F), oil pressure should be at least 2.0 bar (29 psi).

^ At higher engine speed, oil pressure must not exceed 7.0 bar (101 psi).

- If necessary, replace oil pump cover including pressure relief valve.