Charge Pressure Bypass Valve, Checking

Charge Pressure Bypass Valve, Checking

Special tools, testers and auxiliary items required







- Hand vacuum pump V.A.G 1390

Requirements
- Poor performance or load change jerks
- Turbocharger noise when closing the throttle valve

Work sequence

NOTE: The charge pressure bypass valve is located in front of the turbocharger. It is opened by vacuum in the overrun phase and at idling speed.







- Connect hand vacuum pump V.A.G 1390 to vacuum connection of charge pressure bypass valve.
- Operate hand vacuum pump.
- Charge pressure bypass valve must open - arrow -
- Ventilate valve on hand vacuum pump.
- Charge pressure bypass valve must close - arrow -

If the valve does not open or close:
- Replace charge pressure bypass valve.

NOTE: The charge pressure bypass valve connections must be secured with spring-type clamps.