故障现象:比亚迪唐车辆正常行驶中躲避前方障碍物,打方向时突然没有助力,在低速转弯时转向打到一半时突然没有助力,但是没有助力时用力左右转动转向盘就有助力了。
故障分析:电动机接插件松动;系统软件是否有升级项目;电动机故障;供电电路虚接或短路;搭铁不良。
检修过程:
① 首先,举升车辆查看接插件是否松动或脱落,特别是电动机和ECU接插件,经检查接插件正常无故障。
② 然后用VDS1000检查是否有关于电动机的升级更新项目,在扫描后发现电子转向系统有3处故障码:扭矩传感器故障;转角信号故障;电动机过流故障。
③ 分析这三个故障的共同点。从第三个故障看应该是搭铁不良,通过查询电路图发现这三个故障是有交集的,找到电动机搭铁点发现螺丝处有电烤漆引起搭铁不良,打磨处理装车试车,故障依旧。
④ 再次读故障码发现电动机过流故障依然存在,分析为电动机故障,但是再次拆卸检查搭铁点(下图),发现在搭铁点焊接点上有突起点,再看看线卡上的附着面上只有一个点,就是搭铁不良。
⑤ 再次打磨搭铁点,把凸点打磨平,再次装车试车,故障消失。
点评:按照维修手册指导处理搭铁点故障,需同时更换R-EPS搭铁螺母。
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/36744.html
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