Supply Line, Vacuum Reservoir and Check Valve, Checking

Supply Line, Vacuum Reservoir and Check Valve, 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)

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

- Remove the vacuum hose - II - from the wastegate bypass regulator valve.






- Plug the hose with a suitable plug.

• Do not use threaded bolts or pins.

- Remove the vacuum hose - arrow - on 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 (sec.).

• 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:

- Remove the hose on the hand vacuum pump (VAS 6213).

- Remove the plug from the end of the hose.

- 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:

- Reconnect the vacuum hoses.

- Check the control line to turbocharger. Refer to => [ Control Line to Turbocharger, Checking ] Scan Tool Testing and Procedures.