TT Quattro Coupe L4-1.8L Turbo (AWP) (2001)
Air Injection Control Valve: Testing and Inspection
Combination Valve, Checking
Recommended special tools and equipment
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VAG1390 Hand Vacuum Pump
Test requirements
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No leaks in vacuum lines or hose connections.
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Vacuum hoses not clogged or kinked
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Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked
Test sequence
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Disconnect vacuum hose at combination valve.
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Connect hand vacuum pump (VAG1390) to vacuum hose of combination valve.
NOTE: Do not use pressurized air for the following test.
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Disconnect pressure hose between Secondary Air Injection (AIR) Pump Motor and connecting pipe and blow into it with light pressure.
Combination valve must close.
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Operate hand vacuum pump.
Combination valve must open.
If the combination valve does not open or it is constantly open:
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Replace combination valve.