Rabbit L5-2.5L (CBUA) (2008)
Engine Oil Pressure: Testing and Inspection
Oil Pressure and Oil Pressure Switch, Checking
Special tools, testers and auxiliary items required
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Oil pressure gauge V.A.G 1342
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Voltage tester V.A.G 1527 B
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Connector test set V.A.G 1594C
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Engine oil level OK.
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Engine oil temperature at least 80° C (radiator fan must start up once)
Note:
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For the functional check and servicing of the optical and acoustic oil pressure warning: wiring diagrams and "Function and Component
Selection".
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Remove oil pressure switch F1 and screw into oil pressure gauge.
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Thread oil pressure gauge into oil filter bracket in place of oil pressure switch.
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Connect brown wire of tester to Ground (GND).
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Connect voltage tester V.A.G 1527 B using adapter cables from connector test kit V.A.G 1594C to B+ and oil pressure switch. LED must not light
up.
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If LED lights up, replace 1.4 bar Oil Pressure Switch F1.
If LED does not light up:
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Start engine and increase engine speed: The LED must illuminate at 1.2 to 1.6 bar positive pressure, otherwise replace the oil pressure switch.
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Increase engine speed further. At 2000 RPM and an oil temperature of 80° C, oil pressure must be between 2.7 and 4.5 bar.
At higher engine speeds oil pressure must not exceed 7.0 bar
If the specification is not obtained:
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Check screen in oil intake pipe for soiling.
Note:
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Also, mechanical damage e.g. bearing damage can also be the cause of too low oil pressure.
If no malfunction can be found:
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Replace oil pump.
If specification is exceeded:
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Check oil channels.
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If necessary, replace oil filter bracket with pressure relief valve.