GTI L4-2.0L Turbo (CBFA) (2008)
Oil Pressure Switch (For Fuel Pump): Testing and Inspection
Oil Pressure and 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 1527B
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Connector Test Set V.A.G 1594C
Requirements
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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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Function test and servicing the optical and acoustic oil pressure indicator: wiring diagrams, "Function and Component Selection".
Test Sequence
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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.
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Connect voltage tester V.A.G 1527B 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: LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch.
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Increase engine speed further. At 2000 rpm and an oil temperature of 80° C, the oil pressure should be between 2.7 to 4.5 bar.
At higher engine speeds oil pressure must not exceed 7.0 bar
If specification is not obtained:
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Check screen in oil intake pipe for contamination.
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.