11 61 730 BMW leakage test for air intake system (N20/N26)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

81 31 2 357 800 (bisher: 81 38 2 201 924)
0 426 464
2 285 501
2 353 954

Attention!

Excess pressure and vacuum lines are identified by the size of the seals and colour-coded Red and Blue and must not be mixed up with each other.

Build up pressure with Blue colour.

Generate vacuum pressure with Red colour.

Mixing up the functions will result in damage to the engine.

Necessary preliminary tasks:

Prepare BMW diagnosis system.
Start diagnosis program.

Power train
Engine electronics
Air supply
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.

Fit connector (81 29 2 158 850) on diagnosis auxiliary device (81 29 0 426 464).
Connect pressure hose 81 31 2 357 800 (bisher: 81 38 2 201 924) on diagnosis auxiliary device (81 29 0 426 464).
Overpressure connection (Blue).
Connect 12 V cable (3), positive battery terminal and negative terminal.
Connect 12 V cable (4), positive battery terminal and negative terminal.

Fig 1: Connecting Battery Terminals

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 81 31 2 357 800 (bisher: 81 38 2 201 924).

Graphic N63.

Fig 2: Inserting Blue Overpressure Lines On Diagnosis Auxiliary Device (0 426 464) On Connector

Disconnect clean air pipe at intake silencer housing.

Screw seal plug 2 285 501 (B11) air-tight 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)

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

Unlock snap fastener (1) on exhaust turbocharger.

Disconnect pressure hose at exhaust turbocharger.

NOTE: Shown with engine/cooling package removed for better overview.

Fig 4: Identifying Exhaust Turbocharger Snap Fasteners

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

Fig 5: Closing Pressure Hose Air-Tight To Charge Air Cooler With Seal Plug

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

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: Removing Retaining Clip On Throttle Valve Pressure Hose

Required seal plug.

Part Number 13 90 7 515 387

Fig 7: Identifying Seal Plug (7 515 387)

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

Fig 8: Identifying Seal Plug (7 515 387)

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: Closing Pressure Pipe With Seal Plug (2 285 501)

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: Connecting Pressure Line

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

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

Follow diagnosis instruction.