Volkswagen Passat 1995 Official Factory Repair Manual page 633

Oil filter housing, disassembling and assembling
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Oil pressure and oil pressure switch,
checking
Note:
To check and service the optical and acoustic oil
pressure warning see the wiring diagram.
- Remove 0.3 bar oil pressure switch -F22- (brown
insulation) and screw into the tester.
- Screw tester into the oil filter bracket in place of
the oil pressure switch.
- Connect brown wire -3- of tester to ground ( -
- Connect diode test lamp VAG 1527B using aux.
cables from VW 1594 adaptor kit to battery
positive (+) and 0.3 bar oil pressure switch -F22
-A-. LED must light up.
- Start engine and increase engine speed slowly.
At 0.15...0.45 bar, LED must go out
- If no, replace 0.3 bar oil pressure switch -F22
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5/12/2004