11 00 039 Checking Compression of All Cylinders

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

Caution: High tension - mortal danger!

Interrupt power supply to ignition coils. Refer to Powertrain Management


Disconnect DME relay (K6300).





Remove all spark plugs, refer to Powertrain Management.
Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.

Note: Check that seal is in perfect condition.





Depress accelerator and actuate starter until compression stops rising.
Compression pressure, refer to Engine, Specifications.

Now clear the fault memory.