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Checking the charge air bypass valve, 4-cyl.

Checking the charge air bypass valve, 4-cyl.



1. Disconnect the vacuum hose from the charge air bypass valve.


2. Connect the pressure/vacuum pump, part no. 30 14 883, and create a vacuum pressure in the valve.

3. Check that the diaphragm is intact. If the diaphragm is damaged, no vacuum can be created.

4. Repeat points 2 and 3 but pump up a pressure.


5. Disconnect the pump.

6. Connect the vacuum hose.