11 00 039 Checking compression of all cylinders (S65)

Special tools required:

IMPORTANT: High voltage - danger to life!
Disconnect all feed lines to the ignition coils (interrupt voltage supply to the ignition coils).

IMPORTANT: Check the Schrader valve on special tool 11 0 235 is correctly fitted (engine damage).
The throttle valves can not be opened by accelerating.
The compression check is carried out exclusively by using the idle actuators.
A compression check is only possible with the diagnosis tester.
If the fuel injectors are not switched off, the catalytic converter is damaged .

Necessary preliminary tasks:

Remove microfilter housing . See 64 31 062 REMOVING AND INSTALLING/REPLACING LEFT LOWER MICROFILTER HOUSING SECTION or 64 31 063 REMOVING AND INSTALLING/REPLACING RIGHT LOWER MICROFILTER HOUSING SECTION .
Remove all spark plugs . See 12 13 512 REMOVING AND INSTALLING/REPLACING ALL IGNITION COILS (S65) or 12 12 011 REMOVE AND INSTALL OR REPLACE ALL SPARK PLUGS (S65) .
Connect diagnosis tester.
1. Service function.
2. Drive.
3. Engine electronics
4. Switch off the fuel injection.
  IMPORTANT: Fuel injectors are switched off.
5. Operate the starter motor for 8 seconds.

Screw in special tool 11 0 235 into spark plug bore.

Make sure the sealing ring on special tool 11 0 235 is in good condition.

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

NOTE: Picture shows S85.

Fig 1: Installing Special Tool (11 0 235) Into Spark Plug Bore

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) Pressure Adapter To Diagnosis Tester

Courtesy of BMW OF NORTH AMERICA, INC.

Delete fault memory.