Oil Pressure And Switch, Checking

Special tools and workshop equipment required 

• Oil pressure gauge VAG 1342
• Voltage tester VAG 1527B
• Connector test set VAG 1594C

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

-- Remove the noise insulation. Refer to Description and Operation .

-- Remove the oil pressure switch and install it to the VAG 1342.

Fig 1: Identifying Oil Pressure Tester V.A.G 1342

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Install the VAG 1342 into oil filter bracket in place of the oil pressure switch.

-- Connect the brown wire of the VAG 1342 to ground.

-- Connect the VAG 1527B using adapter cables from the VAG 1594C to the battery positive and to the oil pressure switch. The Light Emitting Diode (LED) must not light up.

-- If the LED lights up, replace the 1.4 bar, oil pressure switch.

If the LED does not light up:

-- Start the engine and increase the engine speed: The LED must illuminate at 1.2 to 1.6 bar. Replace the oil pressure switch if it does not.

-- Increase the engine speed further. At 2000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure must be between 2.7 and 4.5 bar.

At higher engine speeds oil pressure must not exceed 7.0 bar

If the specification is not obtained:

-- Check the screen in the oil intake pipe for contamination.

If no malfunction can be found:

-- Replace the oil pump with balance shaft drive. Refer to OIL PUMP WITH BALANCE SHAFT DRIVE .

If the specification is exceeded:

-- Check the oil passages.

-- If necessary, replace the oil filter bracket with pressure relief valve.