Abstract
Electronically controlled fuel injection engines are widely used in modern automobiles, it greatly increased the use of engine performance, at the same time, the engine fault diagnosis technology is becoming increasingly high-technology content. Therefore, the development of EFI engine fault diagnosis expert system is particularly necessary. In this paper, the current domestic EFI engine maintenance problems in the process of combining the characteristics of expert systems for EFI engine fault diagnosis system and the achievement of the overall structure of the key technologies are studied. On fault tree analysis and rule-based expert system for the basic theory, design based on fault tree analysis and rule-based diagnostic expert system integration, will be focused on the form of fault tree into a rule, building a knowledge base. To Windows XP as the operating system, Visual C + + as a programming language, developed the EFI engine fault diagnosis expert system, it has a friendly interface to realize the fault diagnosis, knowledge management module's functions and to study the database management practices.