From 06.07

Secondary Air Injection Combination Valve, Checking

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213)

Procedure

• The cylinder bank 1 (right) Secondary Air Injection (AIR) combination valve is shown in the illustration. The procedure is the same for cylinder bank 2 (left).

• Hose connections properly sealed.

- Remove front engine cover in - direction of arrow - if applicable.





- Disconnect the air guide hose - 1 - and connect a suitable assisting hose to the AIR combination valve.





- Disconnect the vacuum hose - 2 - and connect the hand vacuum pump (VAS 6213).

- Blow into the assisting hose using light pressure (do not use pressurized air).

• AIR combination valve must be closed, it must not be possible to blow through.

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





- Operate hand vacuum pump (VAS 6213).

• The AIR combination valve must open, it must be possible to blow through.

If combination valve does not open:

- Replace AIR combination valve.