Double Check Valve, Checking

Double Check Valve, Checking

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213)

• Connector test kit (VAG 1594C)

Test Conditions

• The Evaporative Emission (EVAP) canister purge regulator valve was tested by the (VAS 5051B) and is OK.

Test Sequence

• Intake manifold assembly overview. Refer to --> [ Intake Manifold Assembly Overview ] .

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

- Remove the connector - 1 - and the ventilation hose - 3 - from the EVAP canister purge regulator valve - 2 -.





- Set the slide ring - 1 - on the (VAS 6213) to the -A- position for "vacuum".





- Connect the (VAS 6213) to the EVAP canister purge regulator valve.





- Connect the EVAP canister purge regulator valve - 1 - contacts to the battery using the adapter cables from the (VAG 1594C). This opens the EVAP canister purge regulator valve.

- Then activate the (VAS 6213) several times.

• Vacuum must build up.

- Disconnect the battery again (interrupt the power supply).

No vacuum

- Replace the double check valve - 2 - and the EVAP canister purge regulator valve - 1 -.

• The double check valve, the EVAP canister purge regulator valve and the connecting hoses are a single unit and can only be replaced together.