Computers and Control Systems: Service and Repair

Secondary Air Injection Combination Valves, Checking

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213) or hand vacuum pump (VAG 1390)

Conditions

• The Secondary Air Injection (AIR) solenoid valve or AIR solenoid valve 2 was checked using the vehicle diagnosis, testing and information system (VAS 5051B) in "Guided Fault Finding".

Test Sequence

If the AIR solenoid valve and AIR solenoid valve 2 are OK:

- Check the vacuum system, including the vacuum reservoir in intake manifold, for leaks.

- Check whether the vacuum lines are correctly connected.

- Check that vacuum hoses are not porous.

If no malfunction was found:

- Disconnect the secondary air hose at the position indicated by the - arrow -.





- Lightly blow into the hose to the combination valve. DO NOT used compressed air.

• Both combination valves must be closed, it must not be possible to blow through hose.

- Remove the vacuum hose from the combination valve.

- Connect the (VAS 6213) to the left combination valve.





- Operate the (VAS 6213) several times.

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

If the combination valve does not open:

- Replace the left combination valve. Refer to => [ Secondary Air Injection System Components Assembly Overview ] Secondary Air Injection System Components Assembly Overview.

- Repeat the test on the right combination valve.