Jetta L4-1.8L Turbo (AWP) (2004)
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VAG1390 hand vacuum pump
Test requirement
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Performance deficiency or tip-in shocks
Test sequence
NOTE: The deceleration shut-off valve is located in front of the turbocharger. It is opened by vacuum during deceleration and at idle.
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Connect hand vacuum pump (VAG1390) to vacuum connection for deceleration shut-off valve.
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Operate vacuum pump.
Deceleration shut-off valve must open in direction of arrow
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Operate ventilation valve at vacuum pump.
Deceleration shut-off valve must close
If deceleration shut-off valve does not open or does not close, replace valve.
NOTE: Secure connections of deceleration valve using screw-type clamps.