audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Vacuum Diaphragm For Wastegate Bypass Regulator Valve, Checking > < Overview of Turbocharging System|Page 6334
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Air Bypass Valve: Testing and Inspection
Deceleration Shut-Off Valve, Checking

Deceleration Shut-off Valve, Checking

Recommended special tools and equipment e.g.:

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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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Attach VAG1390 vacuum pump to recirculation valve.

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Operate vacuum pump.
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Recirculation valve must open (arrow)

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After approx. 30 seconds, operate vent valve on vacuum pump.
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Recirculation valve must close (arrow)

If recirculation valve does not open or close or valve plate does not seal correctly when valve is closed:

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Replace recirculation valve. Secure connections of recirculation valve using screw clamps.

Vacuum Diaphragm For Wastegate Bypass Regulator Valve, Checking > < Overview of Turbocharging System|Page 6334