11 00 039 Checking compression in all cylinders (N43/N53/N54)

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Read out fault memory of DME control unit
Check stored faults
Rectify faults
Delete fault memory

IMPORTANT: High tension - mortal danger!

Interrupt power supply to ignition coils.

Read and comply with notes on compression pressure check.

Necessary preliminary tasks

Remove spark plugs

Unscrew tip (1) from special tool 11 0 222.

IMPORTANT: Then check the Schrader valve that is now visible for secure seating.

Fig 1: Removing Tip From Special Tool 11 0 222

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Prepare special tool 11 0 222 in conjunction with 11 8 732 and 11 8 731.

Fig 2: Identifying Special Tool 11 0 222, 11 8 732 And 11 8 731

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Screw special tool 11 0 222 into special tool 11 8 731 to 10 Nm.

IMPORTANT: Oil thread on special tool 11 8 731.

Fig 3: Inserting Special Tool 11 0 222 Into Special Tool 11 8 731

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Screw special tool 11 0 222 by hand into spark plug thread and connect special tool 11 0 224.

Use adapter (1) if the compression pressure is being checked with the BMW diagnosis system.

Depress accelerator pedal and actuate starter until compression pressure stops rising.

NOMINAL VALUES , compression pressure

Fig 4: Installing Special Tool 11 0 222 Into Spark Plug Thread

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Assemble engine

Delete fault memory.