Air Injection Vacuum Control Solenoid Valve: Testing and Inspection

Secondary Air Injection Solenoid Valve (N112), Checking

Special tools, testers and auxiliary items required

• Connector Test Set (V.A.G 1594 C)

• Hose, for example, a Coolant Hose

Test Sequence:

• Do not use compressed air during the following check!

- Remove the engine cover with air filter. Refer to => [ Engine Cover with Air Filter ] Engine Cover with Air Filter.

- Disconnect the pressure hose - 2 - from the secondary air injection solenoid valve - 3 -. To do so, compress the securing ring.






- Disconnect the harness connector - 4 -.

- Slide the assisting hose - 1 -, for example a coolant hose, onto the secondary air injection solenoid valve.

- Blow forcefully into the assisting hose - arrow -.

The valve must be closed.

If air can be blown through the valve with the assisting hose properly sealed:

- Replace the secondary air injection solenoid valve.

If the valve is closed:

- Connect the terminals on the connector connection - 5 - with adapter cables from the connector test set (V.A.G 1594 C) to battery positive (+) and negative (-).

- Blow forcefully into the assisting hose - arrow -.

The valve must be opened.

If no air can be blown through the valve with the assisting hose properly sealed:

- Replace the secondary air injection solenoid valve.