图文原创 作者| 大神修卡车
车型配置
解放JH6.锡柴国四.EDC17-E4〈EDC17CV44〉博世6.5尿素泵
故障现象
亮后处理故障灯,不烧尿素,司机反应动力影响不明显。
故障码
看下图 故障码照片
故障分析-维修过程
看故障码都是历史故障,报的有氮氧传感器的,测量了下氮氧传感器的正负极供电正常24V又测量了下CAN电压电阻都正常〈CAN H2.6 CAN L2.4 电阻60左右〉 还有一个故障码是 SCR喷射时压力过低,就检查尿素滤芯发现比较脏,更换尿素滤芯。
还有故障就是尿素温度故障和尿素液位故障,这个故障从检测仪数据流中可以看到,于是就点击进去看了下数据流,就发现尿素温度负15℃ 还在那里乱跳;
由于不知道尿素温度影响不影响烧尿素,于是就求助了小轨在线问答师傅,师傅回答说影响烧尿素,厂家一般标定在零下五度只左右,知道影响烧尿素就好办了,就到线路图,测量电压是否正常,测量发现,两个5.7V两个0V ,线路正常,就换了尿素温度液位传感器,在看了下尿素温度,这次正常了和本地的温度差不多,还有一个就是加热故障,我是这么想的温度一直都是负,就算在加热温度还是负的,所有报出来了这个加热故障。
结果
试车一切正常,尿素温度和尿素滤芯 导致不烧尿素 点亮故障灯 ,
案例总结
在维修过程中,了解车辆的控制策略也非常重要。
福利~大福利~特大福利~~
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