Check air intake system for tightness

Prerequisite

Intake filter housing or upper section of Intake filter housing Is removed.

WARNING: High-voltage system.
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard through electric shock!

All work on the high-voltage system may only be carried out by specially trained and technically experienced personnel.
For additional information see:
SAFETY INSTRUCTIONS ON HANDLING HYBRID CARS .
For additional information see:
NOTES ON REPAIR OF HIGH-VOLTAGE BATTERY UNIT .

Preliminary work

Refer to REMOVING THE ACOUSTIC COVER .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION OR FRONT THRUST FIELD .
Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR AND THRUST FIELD RESPECTIVELY .
Refer to REMOVING REAR THRUST FIELD .
Refer to REMOVING REAR UNDERBODY PROTECTION .

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 0426 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.

Follow-up work

Refer to INSTALLING ACOUSTIC COVER .
Refer to INSTALLING REAR UNDERBODY PROTECTION .
Refer to INSTALLING THE REAR THRUST FIELD .
Refer to INSTALLING THE UNDERBODY PROTECTION OF THE STEERING GEAR OR THE FRONT THRUST FIELD .
Refer to INSTALLING THE FRONT UNDERBODY PROTECTION OR FRONT THRUST FIELD .