I followed the operational check as described at:
http://pages.prodigy.net/jforgione/MB_AAC.html
and the operational check shows normal. The step 8 shows reading from 8 - 60 volts to the motor according to the settings on the speed.
Trying to follow the procedures to read out the error codes, I can't get them to come up. It always displays the Operational check readings again.

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regards,
Sab.
'07 ML320 CDI (398 ft lbs / 1400 RPM)
'02CL 500
'91 928 GT Supercharged