Test sequence

NOTE: Do not use pressurized air for the following test!

Disconnect vacuum hose -1- at Secondary Air Injection (AIR) Solenoid Valve -N112- (-2-).

Fig 1: Disconnecting Pressure Hose -3- At Secondary Air Injection (AIR) Pump Motor

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Disconnect pressure hose -3- at Secondary Air Injection (AIR) pump motor and blow air in with light pressure (arrow).
Combination valve must close.

NOTE: To disengage, compress the buttons at the hose coupling.

Fig 2: Using Vacuum Pump To Test Combination Valve

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Operate vacuum pump.
Combination valve must open.

If the combination valve does not open or it is constantly open:
Replace combination valve, see item 1.