11 61 730 BMW leakage test for air intake system (N20)

Special tools required: 

• 2 201 924
• 0 426 464 .
• 2 285 501 .
• 2 353 954 .

Necessary preliminary tasks: 

• Prepare BMW diagnosis system.
• Start diagnosis program.
  1. Power train
  2. Engine electronics
  3. Air supply
  4. Charging pressure control

  or Perception

  or Lack of power

Diagnosis instruction Check air intake system for leaks  .

Pressure measurement: 

Prepare BMW diagnosis system on diagnosis unit.

1. Fit connector (81 29 2 158 850) on diagnosis auxiliary device (81 29 0 426 464).

   Connect pressure hose 2 201 924 on diagnosis auxiliary device (81 29 0 426 464).

2. Overpressure connection (Blue).
3. Connect 12 V cable (3), positive battery terminal and negative terminal.
4. Connect 12 V cable (4), positive battery terminal and negative terminal.
   Fig 1: Preparing BMW Diagnosis System On Diagnosis Unit

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Insert the blue overpressure lines on the diagnosis auxiliary device 0 426 464 on the connector (1).

Connect IMIB (3) with connector (2) of the auxiliary diagnosis device using pressure hose 2 201 924.

Graphic shows N63.

Fig 2: Identifying Overpressure Lines, Diagnosis Auxiliary Device, Connector, and IMIB

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Disconnect clean air pipe at intake silencer housing.

Screw seal plug 2 285 501 (B11) airtight onto clean air pipe.

Connect the auxiliary diagnosis device with the seal plug by means of the blue pressure line.

Fig 3: Identifying Seal Plug (2 285 501)

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Diagnosis instruction Check turbocharging path with charge air cooler for leaks  .

Unlock snap fastener (1) on exhaust turbocharger.

Disconnect pressure hose at exhaust turbocharger.

Fig 4: Identifying Snap Fastener On Exhaust Turbocharger

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Close off pressure hose air-tight to the charge air cooler with the seal plug 2 285 501 (A11).

Fig 5: Identifying Seal Plug (2 285 501)

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Unlock retaining clip (1) on the throttle valve pressure hose (3).

Unclip tank ventilation line (2) from bracket.

Unlock and disconnect plug connection (4) on charging pressure sensor.

Undo connecting coupling (5) of the tank ventilation line.

Fig 6: Identifying Throttle Valve Pressure Hose, Retaining Clip, Ventilation Line Coupling, And Plug Connection

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Required seal plug.

Part Number 13 90 7 515 387

Fig 7: Identifying Seal Plug (7 515 387)

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Unlock tank ventilation line at the pressure pipe and close off with seal plug 7 515 387.

Fig 8: Closing-Off Tank Ventilation Line Using Seal Plug (7 515 387)

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Prepare pressure gauge from the tool set 2 285 501 with pressure hose.

Close off pressure pipe with seal plug 2 285 501 (C11).

Set pressure gauge to 1 bar  with adjusting screw.

Close off sliding piece (1) on pressure gauge in direction of arrow.

Fig 9: Preparing Pressure Gauge

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Diagnosis instruction Leak detection with BMW smoke tester  .

Disconnect the overpressure line (2) on the diagnosis auxiliary device.

Connect pressure line (1) from the BMW smoke tester 2 353 954 with the overpressure line (2).

Fig 10: Identifying Pressure Line And Overpressure Line

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Put the BMW smoke tester 2 353 954 into operation according to the operating instructions.

Fig 11: Identifying BMW Smoke Tester (2 353 954)

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Follow diagnosis instruction.