别克老君威的abs泵出现C0550故障码,大家帮忙看看什么问题
别克老君威的abs泵出现C0550故障码,大家帮忙看看什么问题
推荐回答(1个)
进行故障确认,该车确实存在ABS灯一直点亮的现象,用GDS2读取故障码,存在“U0121与电子制动模块失去通讯”、“U0128与驻车制动模块失去通讯”、 “U010100与变速箱模块失去通讯”以及 “00073控制模块通讯总线A关闭”等故障码,并且状态都是通过的,可以在电脑上进行清除。通讯系统由于其设计和工作的特殊性,在插头松动虚接时,水汽进入插头,插针氧化及过脏都会出现类似的故障码。
按照一般通讯系统的维修方法,笔者先检查了出现故障码模块的各个插头,没有发现有可自由晃动的插头及插针,也无明显氧化现象,就在报故障码模块的通讯插针上涂抹了导电胶,清除故障码进行路试,在平坦路面上行驶了4km没有出现异常:而在颠簸路面行驶不足500m, ABS灯就点亮了,此时用GDS2读取故障码,出现U0121和U0128,其他故障码没有再出现。
笔者判断故障点在ABS和电子手刹上,由于在颠簸路面上出现故障,所以怀疑插针在剧烈振动时出现了接触不良的情况,为保证插针牢固接触,笔者在ABS和电子手刹的通信线插针上塞上铜丝,然后进行路试,但是ABS灯仍然亮且出现上述两个故障码。
两个故障码都是高速通讯系统的故障码,当点火开关置于RUN位置时,在串行数据电路上进行通讯的每个模块发送一个健康状态(SOH)信息以确认模块正常,如果模块由于各种原因在串行线路上停止通讯时,模块轮流设置一个与不通讯模块健康状态信息丢失相关的故障码。按照维修手册,笔者对线路进行了测量,通信线之间的电阻均小于0.5Ω,没有发现磨损、短路等异常情况,测量Class2串行数据电路端子2及低速GMLAN串行数据端子1、高速GMLAN串行数据端子6和14,数据均正常。在点火开关置于OFF位置60s后,测得了串行数据电路与数据链路连接器端子之间电阻小于5Ω,为正常情况。
此时,线路损坏的情况基本可以排除,进一步怀疑模块有问题,翻阅相关电路图发现,ABS模块在通讯线路中与其他几个模块串联,处于关键位置。将同款事故车上的ABS模块与该车对换,进行维修编程、配置与设定后,路试了好长时间故障没有再出现,就把车交付客户,客户使用半个月,没有再出现问题。
由于该车处于质保期内,4S店没有权利随意更换索赔模块,维修站向上海通用做了技术反馈,索赔更换ABS模块。于是进行订货更换新的ABS模块,本年内多次回访没有再出现ABS问题。
从文字中能够看出作者在多路通信系统方面有着较深的造诣。对于大部分维修技术人员来说,对于CAN通信系统的维修,基本是白纸一张,至于CAN系统的工作原理,了解的人就更少了,各种职业院校对学生的学习和4S店对员工的培训均很少涉及这方面的知识,了解得不够,接触得也少,就导致了大家面对CAN系统故障时所有些茫然。
在现代车辆大量采用多路通信系统的情况下,从教育源头上,厂家、4S店的培训上,还有社会修理厂技术人员的培训上,确实需要实实在在的进行一些工作了,否则就无法面对日益繁多出现的问题。只有整个行业的技术水平与现有的车辆技术匹配了,才能从根本上解决这一脱节问题。
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