故障现象一辆2016款奥迪Q3车,配置CSS发动机,累计行驶里程为2 706 km。客户反映该车发动机无法起动。故障诊断接车后试车,确认故障现象属实,同时仪表上的多个故障灯异常点亮(图1)。连接故障检测仪,读得的故障代码如图2所示。分析读取的故障代码,首先对该车的传动系统数据总线进行检查。利用故障检测仪读取了传动系统数据总线的测量值(图3),结果显示总线上安装的所有控制单元通信 Symptoms A 2016 Audi Q3 with CSS engine has a total mileage of 2 706 km. Customer reflects the car engine can not start. Troubleshooting After the test car, test to confirm the fault phenomenon is true, while the instrument on the fault light abnormal lit (Figure 1). Connect the fault detector, read the fault code shown in Figure 2. Analysis of the fault code read, first of all, the vehicle’s drivetrain data bus to check. Using the fault detector to read the drive system data bus measured values ​​(Figure 3), the results show that all the control unit installed on the bus communication