11 00 039 Checking compression of all cylinders (S65)

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

IMPORTANT: High tension - mortal danger!
Disconnect all supply leads from ignition coils (interrupt power supply to ignition coils).

IMPORTANT: Check Schrader valve on special tool 11 0 235 for correct seating (engine damage).
The throttle valves cannot be opened by opening the throttle.
The compression check is carried out exclusively by means of the idle actuators.
A compression check is only possible with the diagnosis tester.
The catalytic converter will incur damage if the fuel injectors are not switched off.

Necessary preliminary tasks:

Remove microfilter housing See 6431062 REMOVING AND INSTALLING/REPLACING LEFT LOWER MICROFILTER HOUSING SECTION or 6431063 REMOVING AND INSTALLING/REPLACING RIGHT LOWER MICROFILTER HOUSING SECTION .
Remove all spark plugs See 1213512 REMOVING AND INSTALLING/REPLACING ALL IGNITION COILS (S65) or 1212011 REPLACING ALL SPARK PLUGS (S65) .
Connect diagnosis tester.
1. Service function.
2. Drive.
3. Engine electronics
4. Switch off fuel injection.
  IMPORTANT: Fuel injectors are switched off.
5. Actuate starter motor for 8 seconds.

Screw special tool 11 0 235 into spark plug hole.

Check that sealing ring is in perfect condition on special tool 11 0 235.

Connection (1) for diagnosis tester or special tool 11 0 224.

NOTE: Picture shows S85.

Fig 1: Inserting Special Tool 11 0 235 Into Spark Plug Hole

Courtesy of BMW OF NORTH AMERICA, INC.

Connect special tool 11 0 224 or 25 bar pressure adapter to diagnosis tester.

COMPRESSION PRESSURE .

Fig 2: Connecting Special Tool (11 0 224) Or 25 Bar Pressure Adapter To Diagnosis Tester

Courtesy of BMW OF NORTH AMERICA, INC.

Now clear the fault memory.