Compression Check: Testing and Inspection

11 00 039 - Checking compression of all cylinders (S65)





Special tools required:
- 11 0 224
- 11 0 235






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.
- Remove all spark plugs.
- 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.





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

Compression pressure .





Now clear the fault memory.