Volkswagen Passat 1995 Official Factory Repair Manual page 1399

Secondary Air Injection (AIR) system
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Combination valve, checking
Recommended special tools and
equipment
V.A.G1390 hand vacuum pump
Test requirements
No leaks in vacuum lines or hose
connections.
Vacuum hoses not clogged or kinked
Pressure hose for Secondary Air Injection
(AIR) Pump Motor not clogged or kinked
Test sequence
Note:
Do not use pressurized air for the following
test!
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6/12/2004