关键词: 发动机故障灯；发动机电控单元；车身模块；CAN 总线

Abstract: Electronic control system and controller area network (CAN) bus have been widely used in heavy-duty trucks, the control principle is more complex, fault judgment and maintenance is difficult, and it is urgent to improve the skills of maintenance personnel. Aiming at the circuit fault of a heavy truck with remote throttle, this paper adopts the method of schematic diagram analysis, expounds its control principle and mutual influence relationship, obtains the characteristic law of fault generation through comparative research, guides maintenance personnel to clarify the electronic control principle, CAN bus network, master the ideas and methods of fault judgment, and provide reference for troubleshooting.

Key words: Engine diagnosis lighting; Engine electronic control unit; Body modules; CAN bus