audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Air Injection Control Valve|Testing and Inspection|Page 3811 > < Charge Pressure Bypass Valve - Groaning/Howling|Page 3807
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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.

Air Injection Control Valve|Testing and Inspection|Page 3811 > < Charge Pressure Bypass Valve - Groaning/Howling|Page 3807