Test sequence (vehicles with engine codes BDF and BJS)

• Remove engine cover.
• Disconnect intake air hose between Mass Air Flow (MAF) sensor and throttle valve control module.

Fig 1: Locating Vacuum Hose At Combi-Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Disconnect vacuum hose from Secondary Air Injection (AIR) Solenoid Valve -N112- at combination valve (arrow).

Fig 2: Hand Vacuum Pump VAG 1390 Connected To Vacuum Hose From Combi-Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect hand vacuum pump (V.A.G 1390) to vacuum connection of combination valve (arrow).

Fig 3: Locating Pressure Hose To Combi-Valve At Connection

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Disconnect pressure hose to combination valve at coupling (arrow) and blow into it with light pressure.

Combination valve must close.

• Operate vacuum pump.

Combination valve must open.

If the combination valve does not open or it is constantly open:

• Replace the combination valve:

• Vehicles with engine code BDF. Refer to Parts of Secondary Air Injection (AIR) system (vehicles with engine code BDF), removing and installing  , item 5
• Vehicles with engine code BJS. Refer to Parts of Secondary Air Injection (AIR) system (vehicles with engine code BJS), removing and installing  , item 5

• Erase DTC memory of Engine Control Module (ECM). Refer to Diagnostic mode 4: Reset/erase diagnostic data
• Generate readiness code. Refer to Readiness code, generating