Oil Pressure And Switch, Checking

WARNING: This page is about a different car, the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2009 Volkswagen GLI, 2008 Volkswagen Jetta, and 2008 Volkswagen GLI. However, it is still accessible from the selected car via links, so may be relevant.

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).

NOTE:

For the functional check and servicing of the optical and acoustic oil pressure warning. Refer to "Function and Component Selection" in the vehicle diagnostic tester.

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.

Fig 1: Identifying Oil Pressure Gauge V.A.G 1342 With Adapter V.A.G 1342/14 Connected To Hole For Oil Pressure Switch

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- 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.

NOTE:

Check for mechanical damage, for example, bearing failures that can cause low oil pressure.

If no malfunction can be found:

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

If the specification is exceeded:

-- Check the oil passages.