New 4376640 ECU Controller for Hitachi Excavators The 4376640 ECU controller, also commonly referred to as a vehicle controller, controller CPU, computer board, or control unit, manages and communicates with the machine’s electronic systems to support proper equipment operation. This quality replacement controller is designed for compatible Hitachi excavators. Hitachi Excavators: EX230-5, EX230LC-5 Don’t forget to check out our dismantled parts machines