11 00 039 Checking compression of all cylinders (W20)

Special tools required:

12 3 621
2 357 744
0 431 592

WARNING: High-voltage system - danger to life
Compliance with the following points is mandatory before beginning work:

De-energize the HIGH-VOLTAGE SYSTEM .
Observe SAFETY INFORMATION for handling electric cars.

IMPORTANT: High pressures - mortal danger!

Necessary preliminary tasks:

Remove SPARK PLUGS .

Unlock plug connections (1) of fuel injectors and pull off.

Unclip cable (2) from fuel injection pipe.

Fig 1: Identifying Fuel Injectors Plug Connections And Cable

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Courtesy of BMW OF NORTH AMERICA, INC.

Push special tool 12 3 621 onto ignition coil in direction of arrow.

Fig 2: Pushing Special Tool (12 3 621) Onto Ignition Coil

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Courtesy of BMW OF NORTH AMERICA, INC.

Pull out ignition coil (1) by means of special tool 12 3 621 and remove.

Slowly pull the ignition coil (1) up and out without jerking it.

NOTE: The compression test can only be initiated when both ignition coils are connected.

Fig 3: Pulling Out Ignition Coil With Special Tool (12 3 621)

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Courtesy of BMW OF NORTH AMERICA, INC.

Screw in special tool 2 357 744 by hand.

Fig 4: Screwing In Special Tool (2 357 744)

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Screw in pressure sensor 0 431 592 by hand in special tool 2 357 744 .

Connect diagnostic cable (1) with special tool 0 431 592.

Fig 5: Connecting Diagnostic Cable With Special Tool (0 431 592)

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Courtesy of BMW OF NORTH AMERICA, INC.

Connect measuring cable with Integrated Measurement Interface Box IMIB (1).

Fig 6: Connecting Measuring Cable With Integrated Measurement Interface Box IMIB

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Courtesy of BMW OF NORTH AMERICA, INC.

Follow diagnosis instruction.