MAN-Cats – Software Description At “control unit identification” you find the engine number which must be checked. If engine and control unit do not match it is very important to inform MAN. Further informa- tions see below: Next in the submenu you find “Fault memory content” which again shows the EDC’s actual fault memory (e.g. see picture below). “Control rod test” contains on “EHAB” test which will not be explained here. 85