VIN:SCFFDAAE2AG××××××。
行驶里程:30278km。
故障现象:
客户反映间歇性出现发动机动力不足,仪表提示发动机排放系统故障。
连接阿斯顿马丁专用诊断仪ADMS,读取故障信息,如图1所示。
主发动机控制单元EMS故障码:P2106 Throttle actuator control system–forced limited power(节气门促动器控制系统-功率强制限制)。
副发动机控制单元EMS-S故障码:
P1579 Unable to reach desired angle. Throttle angle greater than demand(节气门未能达到期望角度,角度大于请求)。
P1712 Transmission torque change request signal malfunction(变速器扭矩转换请求信号故障)。
P2073 Manifold absolute pressure/Mass air flow- throttle position correlation at idle(怠速进气歧管绝对压力/空气流量-节气门位置修正)。
P2106 Throttle actuator control system–forced limited power(节气门促动器控制系统-功率强制限制)。
P2111 Throttle actuator system-stuck open(节气门促动器系统-不能关闭)。
该款车型搭载 6.0L V12发动机,6速手自一体变速器。6.0LV12首次发布于 1999 年,其原型可追溯至用于 Ford Indigo 概念车的 Duratec V6 发动机以及之后的 Duratec V12 发动机。Ford 和 Cosworth 对其设计进行了改良。
分析储存的故障码可以确定客户反映动力不足的症状与节气门控制系统(ETC)相关。查阅相关资料,在此先简述阿斯顿马丁ETC系统(如图2所示)工作原理:电动节气门可以精确控制进气。每个电动节气门单元均内置有双节气门位置传感器 (TPS)。正常发动机运转过程中,PCM 使用 TPS 信号来指示发动机的动力需求。如果不在理想位置,PCM 会驱动节气门电机,打开或关闭节气门达所需的量。怠速状态下,节气门蝶阀几乎关闭,怠速由细微的节气门运动来控制。弹簧式节气门蝶阀在怠速位置下减弱。如果节气门蝶阀弹簧减弱,气流会让节气门蝶阀在怠速位置减弱。
每个节气门总成内有两个 TPS 反馈电位计(如图3所示)。通过对传感器值互相比较,两个传感器使得系统可以执行合理性检查。一个传感器的读数从0.5V增加到4.5V,另一个
则从4.5V减小到0.5V。电机驱动器采用脉冲宽度调谐技术,表示其始终在控制下缓慢移动。
首先分析主控控制单元的故障码P2106 Throttle actuator control system –forced limited power(节气门促动器控制系统-功率强制限制),该故障码的详解如图4所示。
P2106此故障码设置条件是由于PCM 中一个或多个传感器输入故障,依据代码解析建议需先排除其他所有的故障码最后再处理该故障码。
那么主控发动机控制单元EMS这个码很可能是副发动机控制单元EMS-S中错误代码所造成。应该重点排查副发动机控制单元中这两个故障码P2111 Throttle actuator system- stuck open(节气门促动器系统-不能关闭),以及P1579 Unable to reach desired angle. Throttle angle greater than demand(节气门未能达到期望角度,角度大于请求)。
拆下两列节气门体并未发现严重污垢导致其发卡,进气歧管也没有大量油污(如图5所示)。
参照线路图排除节气门ETC与发动机控制单元EMS-S之间线路(如图6所示),更换两列节气门总成并匹配后故障排除。
故障总结:
对控制单元中有多个故障码的故障需化繁为简,查阅相关资料分析某些故障码可能是因其他代码所造成的。不断总结,这样排除故障才能事半功倍。
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/1878.html
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