Volkswagen Passat 1995 Official Factory Repair Manual page 1380

Secondary Air Injection (AIR) system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
Secondary Air Injection (AIR)
system
WARNING!
Observe the following for all installations,
especially in engine compartment due to lack
of room:
Route lines of all types (e.g. for fuel,
hydraulic, EVAP canister system, coolant
and refrigerant, brake fluid, vacuum) and
electrical wiring so that the original path is
followed.
Watch for sufficient clearance to all moving
or hot components.
Function
Air is blown behind the exhaust valves by the
Secondary Air Injection (AIR) system during a
cold start. Thereby, the emission gas is enriched
with oxygen, initiating a secondary combustion
and thereby shortening the warm-up phase of the
catalytic converter. Activation is triggered by the
Motronic Engine Control Module (ECM) -J220-
and sent via the Secondary Air Injection (AIR)
Pump Relay -J299- to the Secondary Air
Injection (AIR) Solenoid Valve -N112- and the
combination valve.
Page 1 of 21
26-12
6/12/2004