Check air intake system for tightness

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Prerequisite

The intake filter housing or upper section of intake filter housing is removed.

NOTE: TECHNICAL INFORMATION
Excess pressure and vacuum lines can be recognized by the size of their fasteners and are color-coded blue and red respectively.
The overpressure line is marked blue .
The vacuum line is marked red .
Excess pressure and vacuum lines must not be mixed up. Mixing up the lines will result in engine damage.

NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.

Insert the special tool 2 409 665 into the clean air pipe and inflate.
Seal the clean air pipe airtight using special tool 2 409 665.

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Insert the blue overpressure line (2) of the special tool 0 426 464 into the quick-release coupling (1) of the special tool 2 409 665 up to the stop.

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Connect the blue overpressure line to the connector (1) with the special tool 0 426 464.
Connect the Integrated Measurement Interface Box (1) with the help of a hose (e.g. hose with order number 81 31 2 357 800) with the special tool 0 426 464.
The hose is fastened to the connector of the special tool 0 426 464.
Follow diagnosis instruction.

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Disconnect the blue overpressure line (2) from the special tool 0 426 464.
The quick-release coupling stays attached.
Connect the pressure line (1) of the special tool 2 353 954 with the blue overpressure line (2).

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Put the special tool 2 353 954 into operation according to the operating instructions.

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Follow the instructions of the diagnostic system.
Search for leakage smoke.

Leaks in the air intake system are detected through emerging smoke.