With Manufacturer's Scan Tool

Charge pressure bypass valve, checking

Special tools and equipment






- VAG 1390 Hand vacuum pump

Test conditions
- Reduced performance or load change shudders
- Turbocharging noises during closing of throttle valve

Test sequence

Note: The charge pressure bypass 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 charge pressure bypass valve.
- Operate hand vacuum pump.
Charge pressure bypass valve must open in direction of -arrow-.

- Operate vent valve on hand vacuum pump.
Valve must close -arrow-.

- If valve does not open or close, replace valve.

Note: The charge pressure bypass valve connections are secured with screw type clamps.