推荐回答（1个）
读取故障码前应该做哪些准备工作呢
检查故障指示灯
接通点火关启发机控制电脑便始进入初始化状态并整控制系统进行自我检查故障指示灯点亮故障指示灯亮则说明故障指示灯线路故障应予检查修理接通点火关片刻或发机启故障指示灯熄灭则说明控制电脑没查电控系统故障;故障指示灯仍点亮灭则说明电脑控制系统故障读取故障码
做安全工作
目前汽车电控制器系统读取故障般静态(KOEO测试模式)态(福特公司KOER测试模式)两种测试模式静态测试模式状态需要接通点火关需要启发机便读取故障;态测试模式指发机运转程进行故障自诊断种测试模式电控汽车实施态模式测试应确认汽车制状态良变速杆置于驻车挡或空挡必要用三角木块汽车车轮塞住防发测
检查机械件连接
读码前应直观检视与电控制系统关机械部件连接??否脱落、泄漏或者阻塞;空气流量计传器否漏气现象等特别需要注意:述检查程应关闭点火关(OFF)防导线插接程导线连接断电器件所产应电势控制电脑ECU别电元件烧毁导致控制电脑损坏
检查蓄电池电压
汽车蓄电池电压与否检测故障码至关重要于12V系汽车蓄电池说其电压值应低于11V;于24V系汽车蓄电池说其电压值应低于23V
关闭所辅助电器
读码关掉辅助电器设备(空调、灯光、收放机等)必要辅助电器设备仅要消耗部电能且干扰控制电脑工作
适关闭节气门
启发机使其怠速运转并暖机冷却液温度达范围(85~95℃)便电控制系统进行自诊断监测暖机完始检测前应完全松加速踏板使节气门处于全封闭状态
电控汽车进行述准备工作便读取故障码尽管运用控制电脑自诊断功能于读码故障排除极便迅速读码程操作或者未按特定程序进行操作都能带必要麻烦:原排除故障现新故障码;更换关故障部件故障依存或者现故障越越良现象论采用工读码采用专用仪器读码都应确保操作确性您妨注意几点
确清除故障码
汽车故障排除需要清除故障代码进行故障代码清除应严格按照特定车型所规定故障代码清除进行万简单随意用拆除蓄电池负极搭铁线办清除故障代码否则能造两面麻烦:其使某些车型控制电脑失经验记忆我知道些车型控制电脑具自记忆功能拆除蓄电池负极搭铁线便自清除存储随机存储器(RAM)发机运行经验数据使汽车维修相段间内性能或行驶段重现已清除掉故障代码;其二造某些功能丧失音响锁止便较见例则需要按照较烦琐程序音响系统进行解密才能恢复音响系统工作
控制合适水温
读码发机达工作温度进行自诊断测试特别水温85~95℃读码靠否则读码程现串非故障故障码水温、废气再循环、怠速良等故障码等经使误电控制系统故障或自诊断系统现故障
确读码顺序
具静态读码(打点火关启发机)态读码(需启发机)电控制系统言应注意二者读码先顺序及关转换程序否则造读取故障码失败许车型两种读码转换都严格程序要求首先必须先读静态码(即KOEO模式)静态码读完系统未输代码11故障码读取态码(即KOER模式)则现故障失真进造检修误判往往给维修员造种错觉像故障码派用场似同应注意读态码前般需要先清除静态码进行态码自诊断前应拆读静态码诊断插座所连接跨接线清除静态故障码接着启发机并加速2000r/min保持2min便使发机达工作温度关闭点火关等待10s再自诊断接跨接并再启发机所显示故障码便态模式故障码
注意读码记忆修
通电控汽车进行读码、清码故障排除汽车加速性能所降属于现象需要维修员控制电脑ECU进行确行车状况记忆修换言要恢复控制电脑汽车现行状况记忆功能要汽车车况连续重复启、行驶、熄火达定数汽车相关性能逐渐恢复
必意故障码
读取故障码发现故障码所指示故障与汽车实际故障完全关认故障码显示错误必太意造种情况原:维修原故障码未能效清除;二发机再运行维修员意或意碰掉关传器导线连接器
控制电脑所提供故障代码往往仅与所示故障部位应内外线路关般言与其线路该部位机械故障关造电控汽车故障原面实际故障代码仅仅或否界定结论能指故障具体原需要找具体故障部位原需要根据发机故障征兆作进步析检查才能做准确误排除故障
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