Oil Pressure And Switch, Checking

Special tools and workshop equipment required 

• Oil Pressure Gauge -V.A.G 1342-
• Voltage Tester -V.A.G 1527 B-
• Connector Test Set -V.A.G 1594 C-
• Socket 24 mm and Jointed Extension -T40175-

Requirements 

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

Test Sequence 

• Tightening specification, see -item 2- in the OIL FILTER, OIL COOLER AND OIL PRESSURE SWITCH OVERVIEW .

-- Remove the oil pressure switch -F1- and install it into the oil pressure gauge.

Fig 1: Identifying Diode Test Lamp V.A.G 1527 B, Auxiliary Cables -V.A.G 1594 A-, Battery Positive (+) And Oil Pressure Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

-- Thread the oil pressure gauge into the oil filter bracket in place of the oil pressure switch.

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

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

-- 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 the 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. Refer to OIL PUMP .

If the specification is exceeded: 

-- Check the oil passages.