Turbocharger Vacuum Diaphragm, Checking

Turbocharger Vacuum Diaphragm, Checking

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAS 6213)

Test Conditions:

• The hose from the wastegate bypass regulator valve (N75) must be free of kinks.

• The wastegate bypass regulator valve is OK.

Procedure:

- Remove the engine cover/upper air filter housing. Refer to => [ Engine Cover/Upper Air Filter Housing ] Engine Cover/Upper Air Filter Housing.

- 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 end position.

Actuator lift is approximately 10 mm.






• If pressure cannot be raised with the hand vacuum pump (VAS 6213) or the pressure drops immediately, check the hand vacuum pump (VAS 6213) and connecting hoses for leaks. If no malfunction can be found: Replace the vacuum diaphragm. Refer to => [ Turbocharger Vacuum Diaphragm ] Service and Repair.