Secondary Air Injection Combination Valve, Checking

Secondary Air Injection Combination Valve, Checking

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAG1390)





Test Prerequisites

• No leaks in vacuum lines or hose connections.

• Vacuum lines not clogged.

Test Sequence

- Remove engine cover - 1 - upward.





- Disconnect vacuum hose (- arrow -) at combination valve to be tested.





- Connect hand vacuum pump (VAG1390) to vacuum hose of combination valve to be checked.

• Illustration depicts engine from rear.

• Left combination valve is displayed in illustration.

For vehicles with parking/auxiliary heater:

- Remove bolts (- arrows -) for exhaust pipe of parking heater/auxiliary heater on noise insulation.





- Remove noise insulation, - 1 -.





- Disconnect pressure hose - 2 - at Secondary Air Injection (AIR) pump motor and blow air in with light pressure (do not use pressurized air).





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

- Operate hand vacuum pump.

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

If respective combination valve does not open:

- Replace combination valve,