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故障现象一辆2016年产的奔驰B200车(底盘号W246),搭载M274发动机,累计行驶里程约为2万km。车主反映,发动机温度过高,要求拖至维修站检修。故障诊断接车后对车辆进行基本检查,维修人员首先检查冷却液罐中液位,液位正常;冷却系统未见泄漏部位。和车主沟通得知,车辆刚起动没问题,大约5 min后就会出现发动机温度过高的现象。起动发动机,观察仪表,发动机冷却液温度正常,无故障灯点亮。用故障检测仪对车辆进行快速测试,无故障代码存储。检查发动机运转状况,发动机运转平稳;踩下加速踏板,感觉发动机噪音明显增大,发
Trouble phenomenon A 2016 Mercedes-Benz B200 (chassis number W246), equipped with M274 engine, the cumulative mileage of about 20000 km. Owners reflect the engine temperature is too high, requiring maintenance to the depot maintenance. Troubleshooting Car after the basic vehicle inspection, maintenance personnel first check the liquid level in the coolant tank, the liquid level is normal; no leakage of the cooling system. Communication with the owner that the vehicle just started no problem, about 5 min after the engine temperature will be too high phenomenon. Start the engine, observe the meter, the engine coolant temperature is normal, no fault light is lit. Quickly test the vehicle with a fault detector, without fault code storage. Check the engine operating conditions, the engine running smoothly; depress the accelerator pedal, feeling the engine noise significantly increased, hair