A personal computer (PC) is connected to the MUTIII unit and used as a system's control terminal, and communicates with a vehicle ECU through the VCI.The MUT-III system can display data as easy-to-understand diagrams and graphs on a large screen of the PC.Unlike the MUT-II, the MUT-III can retain data on all vehicles, from old to new models, classified according to destination in the PC's hard disk.