Test sequence

• Remove air filter housing. See REMOVING
• Detach vacuum hose (arrow) from combination valve which is to be tested.
• Connect hand vacuum pump V.A.G 1390 to vacuum hose for relevant combination valve.

Fig 1: Detaching Vacuum Hose From Combination Valve

Courtesy of AUDI OF AMERICA, INC.

• Disconnect pressure hose -2- at secondary air pump motor and blow into hose lightly (do not use compressed air). See Fig 2.
  • Both combination valves should be closed; it should not be possible to blow through hose.
• Operate hand vacuum pump.
  • The relevant combination valve should open; it should now be possible to blow through hose.
Fig 2: Disconnecting Pressure Hose At Secondary Air Pump Motor
Courtesy of AUDI OF AMERICA, INC.

If relevant combination valve does not open:

• Replace combination valve. See COMBINATION VALVE (LEFT) FOR SECONDARY AIR SYSTEM, REMOVING AND INSTALLING  or COMBINATION VALVE (RIGHT) FOR SECONDARY AIR SYSTEM, REMOVING AND INSTALLING .
• Install air filter housing. See INSTALLING