Patent 7366596 was granted and assigned to Mitsubishi Fuso Truck and Bus Corporation on April, 2008 by the United States Patent and Trademark Office.
A trouble diagnosing device connectable to an ECU mounted on a vehicle and equipped with a memory to store current trouble information and past trouble information, and the trouble diagnosing device includes a display screen to display a diagnosed trouble state, and a simultaneous display unit to call trouble information stored in the memory and make both of the current trouble information and past trouble information displayed at a same time on the display screen.