Oil pressure and oil pressure switch, checking

Fig 1: Identifying Special Tools - Oil Pressure And Oil Pressure Switch, Checking

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Test conditions: 

• Engine oil level OK, checking Markings on oil dipstick  under Lubrication system components, assembly overview  .
• Engine oil temperature at least 80 ° C (radiator fan must start up once)

Test sequence: 

Fig 2: Identifying V.A.G 1342 Oil Pressure Tester

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Remove oil pressure switch F1 and install into oil pressure gauge.
• Install oil pressure gauge V.A.G 1342 into oil filter bracket in place of oil pressure switch.
• Connect brown wire of tester to Ground (GND).
• Connect voltage tester V.A.G 1527 B using adapter cables from connector test kit V.A.G 1594 C to B+ and oil pressure switch. LED must not light up.

• If LED lights up, replace 1.4 bar Oil Pressure Tester V.A.G 1342.

If LED does not light up:

• Start engine and let run at idle: LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch.
• Check oil pressure at different speeds:

2000 RPM: 2.7 to 4.5 bar

Above 2000 RPM: maximum 7.0 bar

If specifications are not obtained:

• Correct mechanical damage, e.g. bearing damage.
• Replace oil filter bracket with pressure relief valve or oil pump.

At higher engine speeds oil pressure must not exceed 7.0 bar

If specification is exceeded:

• Check oil channels.
• If necessary, replace oil filter bracket with pressure relief valve.