Jetta GLX V6-2.8L (AFP) (2002)
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Disconnect vacuum hose -1- from Intake Manifold Tuning (IMT) valve - N156- -2-.
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Connect VAG1390 hand vacuum pump to Intake Manifold Tuning (IMT) valve -N156- -2-.
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Perform output Diagnostic Test Mode (DTM) again. When Intake Manifold Tuning (IMT) valve -N156- is activated, operate hand pump
uniformly.
The positioning element must switch back and forth between the two positions.
If the change-over does not function as described:
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Check change-over mechanical components for ease of movement (move rods by hand).
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Check that vacuum hoses are connected correctly.
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Check vacuum system, including vacuum reservoir.
NOTE: The vacuum reservoir is bolted to the sump on the left-side, next to the oil filter.