Vacuum System, Checking

Vacuum System, Checking


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

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAS 6213)

=> [ Supply Line, Vacuum Reservoir and Check Valve, Checking ]

=> [ Control Line to Turbocharger, Checking ]

Supply Line, Vacuum Reservoir and Check Valve, Checking

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

- Seal off the open ends of the hoses with plugs.

• Do not use threaded bolts or pins.

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

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






- Watch the pressure gauge on the hand vacuum pump for approximately 30 seconds.

• The vacuum must not drop.

If the vacuum drops:

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

If the vacuum does not decrease:

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

- Remove the plugs from the hose ends.

- If the check valve functions, a noticeable hissing can be heard as the vacuum in the vacuum reservoir reduces.

If there is not a hissing sound:

- Replace the check valve.

If there is a hissing sound:

- Connect all the vacuum hoses.

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

Control Line to Turbocharger, Checking

- Disconnect the hose on the center connection on the wastegate bypass regulator valve - arrow in I - and on the turbocharger vacuum diaphragm - arrow in II -.






- Seal off the opening in the hose with a plug.

• Do not use threaded bolts or pins.

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

- Watch the pressure gauge on the hand vacuum pump for approximately 30 seconds.

• The vacuum must not drop.

If the vacuum drops:

- Replace the vacuum hose.

If the vacuum does not decrease:

- Connect all the vacuum hoses.

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