Reduced Oil Pressure Switch -F378-, CHECKING

Special tools and workshop equipment required 

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

Procedure

Fig 1: Locating Oil Pressure Switch and Oil Pressure Regulation Valve

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Disconnect the connector -2- from the Reduced Oil Pressure Switch -F378- (brown).

-- Remove the Reduced Oil Pressure Switch -F378-.

-- Connect the Oil Pressure Gauge V.A.G 1342 in the opening for the Oil Pressure Switch.

-- Install the Reduced Oil Pressure Switch -F378- into the oil pressure gauge.

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

Fig 2: Connecting Diode Test Lamp V.A.G 1527 B Using Auxiliary Cables V.A.G 1594 A To Battery Positive (+) And Oil Pressure Switch

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the Voltage Tester V.A.G 1527B using adapter cables from the Auxiliary Measuring Set V.A.G 1594C to battery positive (+) and the Reduced Oil Pressure Switch -F378- (brown).

• LED must not light up.

-- If the LED illuminates, replace the Reduced Oil Pressure Switch -F378-.

If the LED does not light up:

-- Start the engine: the LED must come on at 0.55 to 0.85 bar (7.9 to 12.3 psi). If it does not, replace the oil pressure switch.