TT Roadster L4-1.8L Turbo (AWP) (2003)
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.