Jetta GLS L4-1.8L Turbo (AWP) (2002)
Air Bypass Valve: Testing and Inspection
Deceleration Shut-Off Valve, Checking
Special tools and equipment
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VAG 139O hand vacuum pump
Test requirement
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Performance deficiency or tip-in shocks
Test sequence
NOTES: 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 VAG 1390 hand vacuum pump to vacuum connection for deceleration shutoff valve.
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Operate vacuum pump
Deceleration valve must open (arrow)
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Operate ventilation valve at vacuum pump.
Deceleration shut-off valve must close (arrow)
If deceleration shut-off valve does not open or does not close, replace valve.
NOTES: Secure connections of deceleration valve using screw-type clamps.