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故障现象:一辆奔驰E260,底盘号WDD207436,装配直列4缸274发动机,行驶里程23680km。客户反映发动机故障灯亮,并且启动时间长。故障诊断:接车后尝试启动车辆,启动3~4s才能着车,启动后发动机故障灯亮,在启动时发动机前部区域发出“咔咔”异响,着车后行驶正常。连接诊断仪进行快速测试,读取到发动机控制模块ME中的故障码如图1所示。根据故障码进行引导性检测,检测过程中要求启动发动机,并怠速
Symptoms: a Mercedes-Benz E260, chassis number WDD207436, equipped with inline 4-cylinder 274 engine, mileage 23,680km. The customer reports that the engine fault light is on and the startup time is long. Troubleshooting: After the car to try to start the vehicle, start 3 ~ 4s to the car, start the engine fault light, the engine at the start of the front area issued “Kaka ” abnormal sound, driving normal after the car. Connected to the diagnostic tester for rapid testing, read the engine control module ME in the fault code shown in Figure 1. Guided testing according to the fault code, the detection process requires starting the engine, and idling