摘 要：
汽车上的电子控制部件越来越多，涉及到发动机、底盘和车辆行驶控制技术等方面。当其中的某一元件发生了故障，仅从其外表或依靠传统的检测工具很难去检查，现代新型的发动机管理系统中都设有自诊断功能，称为“车载故障诊断”，该系统的任务是不断监测车辆异常之处，从中找出故障。
关键词：故障码 地址码 数据块 自诊断
Abstract：
There are more and more power-operated parts on buses，relating to engine，chassis and steering technology．etc．When a part breaks down，it is difficult to check with usual methods．Some modern engines' management system“generally bring the self -diagnosis function，called”Onboard Breakdown Diagnosis，with task of constantly monitoring the abnormalities and finding out the breakdowns．
Keywords: Failure codes Address codes Data blocks Since diagnosis
