Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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Disconnect vacuum hose -1- from one- way valve -2- and connect VAG1390 hand pump to disconnected hose.
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Conduct output Diagnostic Test Mode (DTM) again. When Intake Manifold Tuning (IMT) valve -N156-is actuated, operate hand pump.
The actuator must switch (change-over) between open and close (arrow).
If the change-over does not function as described:
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Check change-over mechanics for freedom of movement. To do this operate rods by hand.
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Check vacuum hoses for correct routing.
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Check vacuum system including vacuum reservoir in left wheel housing for leaks.
Electrical check of intake manifold tuning valve -N156-
