Oil Pressure And Switch, Checking

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2008 Volkswagen Jetta, 2007 Volkswagen Jetta, and 2006 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

To check the oil pressure on a Jetta from MY 11, refer to "Guided Fault Finding" in the vehicle diagnostic tester.

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 A or V.A.G 1594 C

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

NOTE:

For information on checking the function and servicing the visual and acoustic oil pressure display, refer to "Guided Fault Finding" ; "Function and Component Selection" in the vehicle diagnostic tester.

-- 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 And Auxiliary Cables V.A.G 1594A Connected To Battery Positive (+) And Oil Pressure Switch

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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

-- Connect the brown wire from the tester to Ground (GND).

-- Connect the voltage tester V.A.G 1527 B using an adapter cable from the connector test set V.A.G 1594 C to 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 engine speed further.

At higher engine speeds the oil pressure must not exceed 7.0 bar
At 2, 000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure must be 2.7 to 4.5 bar.

If the specification is not obtained:

-- Check he screen in the oil intake pipe for contamination, refer to "Oil Intake Pipe" in item: 22.

NOTE:

Also, mechanical damage, for example, bearing damage can also be the cause of too low oil pressure.

If no malfunction can be found:

-- Replace the oil pump, refer to one of the following:

Engine codes BGP and BGQ, refer to OIL PUMP .
Engine codes CBTA and CBUA, refer to OIL PUMP .

If the specification is exceeded:

-- Check the oil passages.

-- Replace the oil filter bracket, if necessary.