Computers and Control Systems: Service and Repair

Secondary Air Injection Solenoid Valve, Checking

Special tools, testers and auxiliary items required

• Connector Test Set (V.A.G 1594 C)

• Assisting Hose, for example, a Coolant Hose

Test Sequence

• Do not use compressed air during following check!

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

- Disconnect connecting pipe - 2 - from the secondary air injection solenoid valve (N112) - 3 -. To do so, compress the securing ring.






- Disconnect the connector - 4 -.

- Slide the assisting hose - 1 -, for example, a coolant hose, onto the Secondary Air Injection (AIR) 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 AIR solenoid valve.

If the valve is closed:

- Connect the terminals on the valve 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 valve with assisting hose properly sealed:

- Replace the AIR solenoid valve. Refer to => [ Secondary Air Injection Solenoid Valve (N112) ] Secondary Air Injection Solenoid Valve (N112).