With Manufacturer's Scan Tool

Overrun Shut-off Valve, Checking

Special tools and equipment







- VAG 1390 Hand vacuum pump

Test conditions
- Reduced performance or load change shudders

Test sequence

NOTE: The overrun shut-off valve is located in front of the turbocharger. It is opened by vacuum pressure during the overrun phase and at idling speed.







- Connect hand vacuum pump VAG 1390 to vacuum connection on overrun valve.
- Operate hand vacuum pump.

Overrun valve must open in direction of -arrow-.
- Operate vent valve on hand vacuum pump.

Overrun valve must close.
- If overrun valve does not open or close, replace valve.

NOTE: The overrun shut-off valve connections are secured with screw-type clips.