Component Tests and General Diagnostics

Turbocharger Vacuum Diaphragm, Checking

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAS 6213)

Test Conditions:

• Hose from exhaust turbocharger over wastegate bypass regulator valve (N75) must have continuity to vacuum diaphragm.

• Wastegate bypass regulator valve OK.

Procedure:

- Disconnect electrical connector on mass airflow (MAF) sensor (G70) - 3 -.






- Open clips - 1 and 2 - and remove air guide hose from MAF sensor.

- Remove front air intake connector on lock carrier - 4 -.

- Remove engine cover.

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






- Set the slide ring - 1 - on (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 (VAS 6213) several times and observe 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 (VAS 6213) or pressure drops immediately, check the (VAS 6213) and connecting hoses for leaks. If no malfunction can be found: Replace vacuum diaphragm, refer to => [ Turbocharger Vacuum Diaphragm ] Service and Repair.