GTI V6-2.8L (BDF) (2002)
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Pull vacuum hose -1-off non-return valve -2-.
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Connect hand vacuum pump VAG 1390 to non-return valve -2-.
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Perform Output Diagnosis Test Mode (DTM) again.When the Intake Manifold Change-Over Valve -N156- valve is activated, operate the hand
pump uniformly.The actuating element must switch back and forth between both positions.
If the change-over does not function as described:
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Check change-over mechanics for freedom of movement. Move the rods by hand.
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Check vacuum pipes for correct connection.
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Check the vacuum system including the vacuum reservoir.
NOTE: The vacuum reservoir is bolted below the intake manifold.