Secondary Air Injection Combination Valves, Checking For Function and Leaks

Secondary Air Injection Combination Valves, Checking for Function and Leaks

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAS 6213)

Procedure






Risk of injury through fan turning on automatically.

• The radiator fan can come on even when the ignition is turned off, for example, caused by the heat still in the engine compartment.

• Vacuum lines and hose connections free of leaks.

• Vacuum lines not plugged.

- Remove the engine covers - 1 and 2 - upward.

- Remove the vacuum hose - 1 or 2 - on the combination valve being checked.






- Connect the (VAS 6213) to the vacuum hose leading to the secondary air injection combination valve being checked.

- Remove the front secondary air hose - arrow - from its bracket and disconnect it; do to so press the release buttons.






- Blow into the Secondary Air Injection (AIR) hose using light pressure (do not use pressurized air).

• The AIR combination valves must be closed. It must not be possible to blow through.

- Operate hand vacuum pump.

• The relevant combination valve must open, it must not be possible to blow through

- If the AIR combination valve does not react as described, replace it. Refer to => [ Secondary Air Injection Left Combination Valve ] Secondary Air Injection Left Combination Valve, => [ Secondary Air Injection Right Combination Valve ] Secondary Air Injection Right Combination Valve.