Passat Wagon L4-2.0L (ABA) (1995)
Engine Oil Pressure: Testing and Inspection
Oil Pressure And Oil Pressure Switches, Checking
For functional testing and repair of the optical (warning light) and acoustic (warning buzzer) oil pressure warning systems: refer to Diagrams, Diagnostic
Aids.
Special tools. testers and auxiliary items
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VAG 1342 oil pressure tester
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VAG 1527B voltage tester
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WV 1594 connector test kit
Checking
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Remove 0.3 bar oil pressure switch F22 (brown insulation) and install in VAG 1342 tester.
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Connect tester to cylinder head or oil filter bracket in place of 0.3 bar oil pressure switch.
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Connect brown wire -3- from tester to ground.
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Connect VAG 1527B voltage tester between battery positive (B+) and 0.3 bar oil pressure switch -A-, using adapter cables from WV 1594
connector test kit.
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LED must light up
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Start engine and increase RPM slowly.
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At 0.15-0.45 bar (2.1-6.5 psi) the LED must go out
If NO:
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Replace 0.3 bar oil pressure switch.
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Connect voltage tester to 1.8 bar oil pressure switch (white insulation) -B-.
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At 1.6-2.0 bar (23-29 psi) LED must light up
If NO:
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Replace 1.8 bar oil pressure switch.
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Increase engine speed further.
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At 2000 RPM and oil temperature at least 80 °C (176°F), oil pressure should be at least 2.0 bar (29 psi).
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At higher engine speed, oil pressure must not exceed 7.0 bar (101 psi).
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If necessary, replace oil pump cover including pressure relief valve.