New Beetle L4-2.0L (AVH) (2005)
NOTE: The variable intake manifold change-over actuator is integrated in the manifold and is therefore not visible from the outside.
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Fit hand vacuum pump V.A.G1390 to vacuum tester V.A.G1368 connection "B".
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Fit vacuum hose to actuator to vacuum tester V.A.G1368 connection "A".
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Set vacuum tester to "A/B" position.
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Operate V.A.G1390 several times. Create a vacuum of maximum 500 millibar.
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Vacuum must not drop
If the vacuum drops:
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Replace intake manifold upper part.
Check vacuum actuator in intake manifold lower part for leaks
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Pull vacuum hose to variable intake manifold actuator - arrow - off variable intake manifold valve 2-1
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Fit hand vacuum pump V.A.G1390 to vacuum tester V.A.G1368 connection "B".
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Fit vacuum hose to actuator to vacuum tester V.A.G1368 connection "A".
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Set vacuum tester to "A/B" position.
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Operate V.A.G1390 several times. Create a vacuum of maximum 500 millibar.
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Vacuum must not drop
If the vacuum drops:
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Replace intake manifold lower part or.
If the vacuum does not drop at either of the vacuum actuators:
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Check change-over mechanics in intake manifold for freedom of movement.
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Remove intake manifold upper part.
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Repeat leak tests on both vacuum actuators. Check that change-over flaps move.
If a malfunction is detected:
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Replace intake manifold upper part or intake manifold lower part.