Secondary Air Injection (AIR) Inlet Valve, checking
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect pressure hose from AIR Inlet Valve.
- Disconnect vacuum hose from AIR Solenoid Valve - N112-.
- Connect VAG 1390 hand vacuum pump to disconnected vacuum hose -1- and AIR Inlet Valve.
CAUTION:
Do not use compressed air during this check.
- Connect auxiliary hose to connection -2-, in place of pressure hose, and blow into it.
- AIR Inlet Valve must be closed
- Operate hand vacuum pump.
- AIR Inlet Valve must open