Charge Air Regulation Vacuum Diaphragm, Checking

Charge Air Regulation Vacuum Diaphragm, Checking

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAS 6213)

Test Conditions:

• The hose between the turbocharger, the wastegate bypass regulator valve (N75) and the vacuum diaphragm must not be kinked.

• The wastegate bypass regulator valve is OK.

Test Sequence:

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

- Connect the hand vacuum pump (VAS 6213) to the vacuum diaphragm - arrow -.






- Set the slide ring - 1 - on the hand vacuum pump (VAS 6213) to position - B - for "pressure".







The pressure must not exceed 750 mbar. If the pressure is exceeded, the vacuum diaphragm can be damaged.

- Operate the hand vacuum pump (VAS 6213) several times and observe the rods:

• The linkage - A - must move approximately 300 mbar and be at approximately 700 mbar at the end position.






• Actuator lift is approximately 10 mm.

If the pressure cannot be built up with the hand vacuum pump (VAS 6213) or pressure falls again immediately:

- Check the hand vacuum pump (VAS 6213) and the connecting hoses for leaks.

If no malfunction can be found:

- Replace the vacuum diaphragm. Refer to => [ Charge Air Regulation Vacuum Diaphragm ] Service and Repair.