Work sequence

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Volkswagen Jetta, 2002 Volkswagen GTI, 2001 Volkswagen Jetta, 2001 Volkswagen GTI, and 2000 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Remove sound insulation: Refer to NOISE INSULATION (GASOLINE ENGINES), ASSEMBLY OVERVIEW or NOISE INSULATION (DIESEL ENGINES), ASSEMBLY OVERVIEW
Pull vacuum hose off combination valve on Secondary Air Injection (AIR) Solenoid Valve N112

Location: Refer to FUEL INJECTION, SERVICING

Fig 1: Manual Vacuum Pump VAG 1390 On Vacuum Hose Connected To Combination Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect Manual vacuum pump VAG 1390 on vacuum hose to combination valve.

NOTE:

Do not use compressed air in the following test!

Fig 2: Intake Hose At Combination Valve On Top Of Air Filter

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove intake hose to combination valve on top of air filter - arrow - and blow in with low pressure.

Combination valve must be closed.

Start hand pump.

Combination valve should open.

If the combination valve does not open:

Replace combination valve, refer to Combination valve, removing and installing .