With Generic Scan Tool

Deceleration shut-off valve, checking

Recommended special tools and equipment e.g.:







- VAG1390 hand vacuum pump

Test requirement
- 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.







- Connect hand vacuum pump (VAG1390) to vacuum connection for deceleration shut-off valve.
- Operate vacuum pump
Deceleration shut-off valve must open (arrow)
- 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:
- Vehicles with engine code AEB, item 12
- Vehicles with engine code ATW, item 21
- Vehicles with engine code AUG, AWM, item 25


NOTE: Secure connections of deceleration valve using screw-type clamps.