Audi AMB Service Manual page 313

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
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Disconnect hose - arrow - at line for secondary air combination valve.
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Connect test hose to line...
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.. and blow into hose with slight pressure (do not use compressed air).
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Combination valve should be closed. It should not be possible to blow through hose.
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Operate vacuum hand pump.
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Combination valve should open. It should now be possible to blow through hose.
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If combination valve does not open:
Replace combination valve --> Secondary air combination valve, removing and installing.
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Secondary air combination valve, removing and installing
Removing
Fig. 413: Removing Engine Cover
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Remove engine cover - arrows -.
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2005 Audi A4 Quattro
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