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
• Torque Wrench (5-50 Nm) V.A.G 1331
• Vehicle Diagnosis Tester

Test Conditions: 

• Engine oil level is OK, checking, refer to OIL LEVEL, CHECKING .
• Engine oil temperature is at least 80 °C (176 °F) (coolant fan must start up once).

Test Sequence: 

• Tightening specifications, refer to OIL FILTER, OIL COOLER AND OIL PRESSURE SWITCH OVERVIEW .

-- Disconnect the connector from the oil pressure switch -F1-.

-- Remove the oil pressure switch -2- using the socket 24 mm and jointed extension T40175 and 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 to ground.

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

• 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 slowly increase engine speed:

• LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace the oil pressure switch.

-- Increase the engine speed (RPM) further:

• At 2000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure should be between 2.7 bar and 4.5 bar.

At higher engine speeds the oil pressure must not exceed 7.0 bar

If the specification is not obtained:

-- Make sure the screen inside the oil intake pipe is not dirty, see "Oil Intake Pipe" in item:  22.

If no malfunction can be found:

-- Replace the oil pump. Refer to OIL PUMP .

If the specification is exceeded:

-- Check the oil passages.