Volkswagen Passat 1995 Official Factory Repair Manual page 473

Secondary Air Injection (AIR) system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
Combi-valve and check valve,
checking
Special tools, testers and auxiliary
items
US 8026 hand vacuum pump
Test sequence
- Disconnect vacuum hose -1- from
secondary air injection solenoid valve
-2-.
- Connect US 8026 hand vacuum
pump to vacuum hose -1-.
- Disconnect pressure hose (arrow)
from combi-valve.
WARNING!
Do not use compressed air during
the following check!
- Connect auxiliary hose to combi-
valve and blow into it.
Valve must be closed.
- Operate hand vacuum pump.
Combi-valve must open. Valve
operation should be smooth
(without sticking)
- Replace combi-valve, if necessary.
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