Test sequence (vehicles with engine codes BDF and BJS)

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen R32, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

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

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

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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

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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.

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

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