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真人娱乐秀GL8商务车发动机经常自动熄火

        一辆行驶里程约6.5万km的2011年真人娱乐秀GL8商务车。

用户反映:

        该车在正常行驶过程中,经常发生发动机自动熄火现象,怠速运转也经常如此。但发动机每次熄火之后,再次起动都比较顺利。但该车以前一直使用正常,只是最近突然出现上述故障。

故障诊断:

        为了验证该车出现的故障,首先真人娱乐秀技师接上行车电脑检测仪,起动车辆,在怠速状态下读取数据流并检测是否有故障码。各种数据与维修手册提供的基本一致且无故障码出现,大约15min后,发动机自动熄火,再次起动仍然能顺利起动。

        由于是1辆新车,在配气相位、气缸压力方面出现故障的可能性很小,于是决定从发动机油路、电路入手。连接燃油压力表,起动车辆,燃油压力显示290kPa(规定值为285~325kPa),发动机熄火后油压也未发生波动,说明燃油系统正常。

        因为每次熄火之后发动机都能着车,所以分别检查点火线圈、高压线、火花塞,均正常。为了更快的排除故障,用替换法将高压线、真人娱乐秀GL8点火线圈、真人娱乐秀GL8火花塞等更换,但故障点还是没找到,说明故障与点火系元件无关。

        故障排查由于真人娱乐秀轿车7X(曲轴位置传感器)信号丢失车辆将无法起动,但3X信号中断车辆可以重新起动。拔下3X信号插头,重新起动发动机,在发动机怠速运转近1小时的过程中,车辆没有熄火,故障再没出现,可见发动机熄火故障出现在3X信号上。

故障分析:

        该车点火系统是DIS(直接点火系统)形式,安装有24X和7X两个曲轴位置传感器,点火模块用7X信号作为曲轴位置指示,控制点火线圈,否则发动机无法运行。3X信号是7X参考信号至ICM(点火模块),而由ICM产生的脉冲信号送到PCM(发动机动力控制模块),PCM利用此信号计算曲轴的位置和发动机转速,如果运行中丢失3X信号,发动机会立即熄火,但再次起动车辆,如果PCM未收到该信号会用24X信号代替,使发动机继续运行。24X信号的作用是通过标定转速提供更高分辨率,增加怠速稳定性和低速运行性能。

故障排除:

        用万用表检测ICM和PCM之间的3X信号线,未发现短路或断路现象,于是判断ICM有故障。更换ICM后试车,故障排除。



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