Secondary Air Injection Combination Valve, CHECKING

WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Observe all safety precautions. Refer to SAFETY PRECAUTIONS .

View clean working conditions. Refer to CLEAN WORKING CONDITIONS .

Special tools and workshop equipment required

Hand vacuum pump.

Test conditions

Vacuum lines and hose connections free of leaks.
Vacuum lines not plugged.

Test procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start procedure

-- Remove the vacuum hose from the combination valve.

-- Connect hand vacuum pump to combination valve vacuum connection.

-- Remove the air duct hose from the Throttle Valve Control Module -GX3- and position it aside.

-- Disconnect the Secondary Air Injection hose.

-- Inject a light air pressure into the Secondary Air Injection hose to close the combination valve (do not use compressed air).

The combination valve should close and seal. Air should not be able to pass through the combination valve.

-- Operate the hand vacuum pump.

The combination valve should open. Air should be able to pass through the combination valve.

If the combination valve does not open:

-- Replace the faulty combination valve. Refer to appropriate repair information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .