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汽车发动机电控燃油喷射系统中，一般都设有故障自诊断系统。当电控燃油喷射系统出现故障时，发动机故障指示灯会被点亮，故障类别则以故障代码的形式显示出来，以便检查与维修。介绍了电控燃油喷射自诊断系统的工作过程、进入故障自诊断系统的方法及故障代码的显示方法等。
Automotive engine fuel injection system, are generally equipped with fault diagnosis system. When the electronic fuel injection system failure, the engine fault indicator light will be lit, the fault type is displayed in the form of fault codes for inspection and maintenance. This paper introduces the working process of electronic fuel injection self-diagnosis system, the method of entering fault self-diagnosis system and the display method of fault code.