Vacuum System, Checking

Vacuum System, Checking

--> [ Supply Line and Check Valve, Checking ]

--> [ Control Line to Turbocharger, Checking ]

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213)

CAUTION!
• When routing the vacuum lines, make sure they are not kinked, twisted or pinched. They could disable the vehicle.

• Follow the safety precautions when working on the charge air system and turbocharger. Refer to --> [ Safety Precautions ] .

• Observe rules for cleanliness. Refer to --> [ Clean Working Conditions ] .

Always follow these instructions before and during work.

Supply Line and Check Valve, Checking

- Remove engine cover. Refer to --> [ Engine Cover ] .

- Disconnect vacuum hose at the lower connection from the wastegate bypass regulator valve --> [ 2 ] .

- Sealing the open end of the hose with a suitable plug.

• Do not use threaded bolts or pins.

- Disconnect vacuum hose - arrow - at the vacuum pump connecting piece.





- Connect hand vacuum pump (VAS 6213) to the removed hose and generate a vacuum of 0.6 bar.

- Observe the manometer on the hand vacuum pump (VAS 6213) approximately 30 seconds.

• The vacuum may not drop.

If vacuum drops:

- Replace hose piece if there is damage or leaks in the hose line connection.

If vacuum does not decrease:

- First disconnect the hose at the hand vacuum pump (VAS 6213).

- Remove plugs from the end of the hose.

- If the check valve --> [ 6 Non-Return Valve ] functions, a noticeable hissing can be heard as the vacuum reduces.

If there is not a hissing sound:

- Replace check valve --> [ 6 Non-Return Valve ] .

- Connect all the vacuum hoses.

If there is a hissing sound:

- Connect all the vacuum hoses.

- Check control line to the turbocharger. Refer to --> [ Control Line to Turbocharger, Checking ].

Control Line to Turbocharger, Checking

- Disconnect vacuum hose at the center connection from the wastegate bypass regulator valve --> [ 2 ] and the turbocharger vacuum diaphragm --> [ 1 Vacuum Diaphragm ] .

- Seal the opening in the hose with suitable plugs.

• Do not use threaded bolts or pins.

- Connect hand vacuum pump (VAS 6213) to the other end of the hose and generator a vacuum of 0.6 bar.

- Observe the manometer on the hand vacuum pump (VAS 6213) approximately 30 seconds.

• The vacuum may not drop.

If vacuum decreases:

- Replace vacuum hose.

- Connect all the vacuum hoses.

- Install the engine cover. Refer to --> [ Engine Cover ] .

If the vacuum does not decrease:

- Connect all the vacuum hoses.

- Install engine cover. Refer to --> [ Engine Cover ] .