CAN总线广泛应用于汽车上,主要用来实现车载网络各电控单元之间的信息交换,形成车载网络系统。由于CAN总线的技术特点,在当前的汽车总线网络市场上CAN总线占据主导地位。因此,介绍CAN总线的基本工作原理和典型的CAN总线应用实例。然后介绍常用的CAN总线故障诊断设备和常见的汽车CAN总线故障检测思路,并通过案例说明汽车CAN总线故障诊断方法。 CAN bus is widely used in cars, mainly used to achieve the exchange of information between the ECU of the vehicle network, the formation of automotive network system. Due to the technical characteristics of the CAN bus, the CAN bus occupies the dominant position in the current automotive bus network market. Therefore, the basic working principle of CAN bus and typical CAN bus application examples are introduced. Then introduce common CAN bus fault diagnosis equipment and common car CAN bus fault detection ideas, and illustrate the case of automotive CAN bus fault diagnosis method.