Oil Temperature Sensor/Switch: Testing and Inspection

Oil Pressure and Oil Pressure Switch, Checking

Special tools, testers and auxiliary items required

• Oil pressure gauge (VAG 1342)

• Voltage tester (VAG 1527 B)

• Connector test set (VAG 1594 C)

• Function test and service of visual and acoustic oil pressure indicator. Refer to and or VAS 5052 "Guided Fault Finding".

Test Sequence

With Engine Code BKW

- Remove fuel filter. Refer to --> [ Fuel Filter ] .

With Engine Code BWF

- Remove bypass flap with cooler for Exhaust Gas Recirculation (EGR). refer to --> [ Bypass Flap with Cooler Assembly Overview ] Bypass Flap with Cooler Assembly Overview.

Continuation for All

• When removing oil pressure switch, counter hold banjo bolt so that leaks in the vicinity of the oil line are prevented.

- Remove oil pressure switch (F1) and install it into oil pressure gauge (VAG 1342).





- Install oil pressure gauge into banjo fitting in place of oil pressure switch.

- Connect brown wire of oil pressure gauge to ground (-).

- Connect diode test lamp of voltage tester (VAG 1527 B) to B+ and oil pressure switch using adapter cables from connector test set (VAG 1594 C). LED must not light up.

With Engine Code BKW

- Install fuel filter. Refer to --> [ Fuel Filter ] .

With Engine Code BWF

- Install bypass flap with cooler for EGR. Refer to --> [ Bypass Flap with Cooler Assembly Overview ] Bypass Flap with Cooler Assembly Overview.

Continuation for All

- Start engine and slowly increase engine speed.

- LED must light up at 0.55 to 0.85 bar positive pressure, otherwise replace oil pressure switch (F1).

- Increase engine speed further. At 2000 RPM and an oil temperature of 80 °C, oil pressure must be at least 2.0 bar.

Oil positive pressure must not exceed 7.0 bar at higher engine speeds.