奔驰E200开空调后发动机舱有异响

奔驰E200开空调后发动机舱有异响 【摘要】:一辆行驶里程约km, 配臵了271 860发动机和722.6变速器的奔驰E200轿车。车主反映:该车在打开空调后，发动机舱发出嗒嗒响声。 接到车辆以后，启动发动机，接着打开空调，前部发出嗒嗒响声.坐车里感到整个车身震动，发动机抖动严重，抖动现象类似发动机缺缸，发动机的转速超过1200r/min时，这种故障现象又没有了) 根据客户描述现象初步判断原因有儿点: (1)发动机的怠速过低，增大负荷时，产生共振。 (2)发动机或变速器的机脚故障，负荷增大以后，产生共振。 (3)空调系统出现故障。 (4)传动皮带中的某个部件损坏。 (5)在怠速时发动机的动力不足 (6)在增大负荷时，发动机控制模块没有响应，转速没有增加。 连接诊断仪，读取发动机坦面的实际值，发动机怠速时的实}赤仇为680r/min, 正常。空调打一开时发动机的转速在750r/min，实际值也正常。为了排除转速的原因，在控制模块适配里面，对进气门进行了学习，P挡转速，D挡转速也进行了学习。再次打开空调，故障现象依然存在。在空调打开的状态下，读取发动机的平稳值也没有发现缺火的现象。读取进气压力(打开空调的时候压力为39kPa，关闭空调的时候压力为30kPa)也在正常范围之内。由此可以将故障点1和5排除。发动机的怠速正常，在增大发动机的负荷时，发动机控制模块相应也正常.故障点6也被排除了。 接下来用诊断仪进入空调系统，读取相应的实际值(蒸发箱面温度传感器为4?;，车内温度为17?，室外温度为26?，压缩机耗电墩为700mA，空调温度调节开关信号、空调打开和关闭Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 按钮信号、电磁离合器已打开)，均正常力表读取空调压力，实际值也正常。空调出风口温度为5-6?; ,出风口温度也正常。读取变频压缩机流以阀的实际值也在正常范围之内.故障点3被排除。 升起车辆后检查发动机与变速器的胶墩，没有漏油现象，胶套也没有破裂，胶墩的高度也没有发生太人变化，用发动机托架支起发动机，钧空调打开的时候嗒嗒的声音和抖动依然存在。检查胶墩和发动机其他支拌架的螺丝没有发现松动，故障点2被排除。车辆熄灭后，拆卸了发动机传动皮带，检查发动机皮带，没有发现异常，用手转动压缩机轮、水泵轮、过桥轮、张紧轮、助力泵轮，均没有发现异常，检查以上部件的螺栓.紧固扭矩均正常。这个时候问看起来复杂了。重新整理了一遍维修思路.发现忽视了一件事情，没有观察发动机驱动皮带的运动状态安设发动机的驱动皮带，打着车观察发动机驱动皮带，在打开空调的时候，发动机皮带张紧器跳动幅度加大，这个部件的跳动是正常的。同时也发现扭转减振器也有轻微跳动。这个部件的跳动是不正常的，随着发动机的转速逐渐增大跳动也看不到了，故障现象也没有了。在空调关闭的时候扭转减振器的跳动也没有了。问题到此应该明朗了，把问题锁定在扭转减振器上。再一次拆卸发动机驱动皮带，转动扭转减振器的胶盘没有脱落，拆掉扭转诚振器检查时发现有3个轮辐断裂，扭转减振器如图所示。 故障排除:更换扭转减振器。经反复测试，故障现象没有出现，故障排除。 故障总结:因为扭转减振器的损坏，在动力传输的过程中.动力损失过大，造成动力不足，导致开空调的时候产生共振。所以在维修共振和异响的故障时思路一定要开阔.要善于抓住细节。 Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 接车后连接丰田专用诊断仪DST-II，启动发动机，打开空调开关，发动机系统数据流显示空调开关信号及电磁离合器继电器信号一直处于OFF状态。打开前机舱盖，发现压缩机不工作，但是空调控制面板A/C指示灯并没有闪烁。该车空调诊断系统没有设计与诊断连接器(DLC)通讯，只能通过控制面板自诊断功能所提供的故障代码进行判断。 如图1所示，同时按下空调控制面板的AUTO开关和进气控制开关，将点火开关拧至ON，控制面板内的所有的运行显示器和温度设臵功能显示都应点亮，在1秒内亮灭4次后，进行记录故障输出，故障码为:11-车内温度传感器电路故障;13-蒸发器温度传感器电路故障;21-日光传感器(乘客侧)电路故障;24-日光传感器(驾驶员侧)电路故障;32-进气口(风挡位臵)传感器电路故障;33-模式(风挡位臵)传感器电路故障;43-模式控制伺服电机电路故障。清除故障码，所有故障代码都不能清除。出风口只能吹前风挡玻璃位臵和脚部位臵，面部位臵一直不能出风。 客户反映，该车已在多家维修站进行过维修，但前后历时两个多月时间始终未能确定故障原因。其他维修人员都怀疑是A/C控制面板总成故障，但是很难找到同一型号的A/C控制面板总成供他们互换，所以不敢拿出肯定的结论。 根据出现多个故障码且不能清除，初步判断主要原因可能有3种:?传感器的共用电源或接地电路故障;?传感器或其电路故障;?A/C控制面板总成(与放大器做成一体)内部集成电路故障。 转自: www.cheshuntong.com 违章代办 wzdbwk 首先，对A/C控制面板总成的主要工作电源及搭铁端子进行检测，各端子检测结果都在正常范围。 室内温度在30?时，室内温度传感器端子电压为1.8V，蒸发器温度传感器端子电压1.2V，都在正常范围内。为什么电压Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 正常还报故障码呢?由于很难找到与本车型号一致的A/C控制面板总成，把本车型号为-的A/C控制面板总成，安装在同一车型A/C控制面板总成型号为-的车辆上，故障码全部可以清除，各伺服电机工作正常，只是压缩机不能工作。通过两种不同型号的A/C控制面板总成电路图可以看出，两者唯一的区别就是压缩机控制条件不同。虽然压缩机不能工作，但其它功能可以恢复正常，故障代码可以清除，至少不能确定故障车辆的A/C控制面板总成就已经损坏。 将故障车辆仪表台拆下，对空调系统线束进行检查。根据电路图2，检测到传感器及伺服电机共用接地端子SG(C17)端子时，发现在关闭点火开关的情况下，SG端子与车身接地导通，电阻只为0.8Ω;打开点火开关，SG(C17)端子与车身接地导通，电阻却为40Ω。那为什么电阻会有如此大变化呢?从A/C控制面板总成电路板上可以测得SG(C17)端子与GND(A23-6)车身接地端子直接连接在一起，是电脑内部搭铁点。直接给SG端子跨接搭铁线，打开点火开关电阻变为6Ω，说明是A/C面板控制器与其连接插头虚接不实。对该端子进行处理，打开空调开关，伺服电机工作正常，压缩机也能正常运转。 故障端子处理后，重新安装仪表台，再次打开空调开关，压缩机又不运转了，故障为何又重现了呢?不安装仪表台时，压缩机工作正常，安装仪表台后，压缩机就不工作。拆装仪表台哪里有和空调系统有联系的呢?经分析，只有日光传感器在拆下仪表台后是没有与A/C控制面板总成连接的，再次拔下日光传感器连接线，“啪”的一声，压缩机电磁离合器吸合了。用万用表检测日光传感器端子侧5号端子有12.5V电压(如图3)，4号端子接地，1号端子1.11V电压，都在正常范围内;测得2号端Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 子有10.55V电压，正常在0.8,3.1V之间，拔下日光传感器连接器插头，用万用表检测日光传感器2号端子与5号端子发现已经短路。由于2号端子电压过高，A/C控制面板总成不能处理该信号，而使其处于保护状态。更换日光传感器，经多次试车，故障没有出现。 维修小结 该故障因SG(C17)端子连接不良，造成电阻过大的现象，应是其他维修人员检测线路时，往该端子内插入类似于大头针的工具造成的。建议在维修过程中，当遇到多个故障代码同时出现，首先要考虑其电源、接地及线路的共用部分。 在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它。但恰好故障的根本原因，就是日光传感器短路的问题。假设日光传感器出现断路状况，它并不会影响压缩机的正常运转，只报出相应的故障代码，所以我们在维修中一定要按部就班一步一步检查，不要忽略任何可疑细节。 该车因存在多处故障点，历经了多家修理厂都未能查出故障原因，结果还人为造成了多处故障，如SG(C17)端子连接不良，电阻过大的现象。这说明很多维修技术人员在进行维修作业时，存在粗心大意、不懂乱修的问题。而本文作者在对这起复杂的故障案例排除过程中，始终保持了清醒的头脑，从开始对空调ECU元件性能的判断，到最终实际故障点的确认，整体的思路非常清晰。尤其值得表扬的是作者对整个故障排除流程的把控，在遇到问题时，进行缜密分析，没有出现随意更换零件的问题。 作者对故障码的处理方法非常到位，在了解了车辆的维修历史、读取了相应的故障码后，根据多故障码同时出现的现象，Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 确定了故障的范围，为后面的维修打下了良好的基础。接着进行的有针对性的检测，发现空调ECU的基础电压、传感器信号在正常范围。显然，作者在进行这项检查时，并没有深入到位，像SG(C17)端子连接不良，电阻过大的问题，并没有及时的检查出来，而是采用了更换零件验证的方式，间接验证了空调控制面板没有问题。接下来的检查，才发现了SG(C17)端子连接不良的问题。处理故障点后空调能够正常工作，作者本以为找到了故障点，但接下来的仪表板安装却将故障带回了原点。我相信，作者开始脑子里充满的肯定是认为控制面板有偶发性故障，但后来的理性分析，使作者考虑到了拆装仪表台前后的区别就是“阳光传感器”! 阳光传感器这个不起眼的“小家伙”的作用，就是给空调ECU提供外界阳光强度的信号，使空调ECU更精确地控制制冷系统的工作强度，从而提高空调的舒适度。阳光传感器安装在仪表板上侧，在空调系统AUTO模式下，当日照量增加时，输出电压上升，空调ECU控制制冷系统增加制冷量，提高室内的舒适度;反之，当日照量减少时，输出电压下降，则降低空调的制冷强度，防止温度过低的情况出现。诚然也像作者总结的，在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它，但恰好故障的根本原因就是日光传感器短路的问题。 接车后连接丰田专用诊断仪DST-II，启动发动机，打开空调开关，发动机系统数据流显示空调开关信号及电磁离合器继电器信号一直处于OFF状态。打开前机舱盖，发现压缩机不工作，但是空调控制面板A/C指示灯并没有闪烁。该车空调诊断系统没有设计与诊断连接器(DLC)通讯，只能通过控制面板自诊断功能所提供的故障代码进行判断。 Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 如图1所示，同时按下空调控制面板的AUTO开关和进气控制开关，将点火开关拧至ON，控制面板内的所有的运行显示器和温度设臵功能显示都应点亮，在1秒内亮灭4次后，进行记录故障输出，故障码为:11-车内温度传感器电路故障;13-蒸发器温度传感器电路故障;21-日光传感器(乘客侧)电路故障;24-日光传感器(驾驶员侧)电路故障;32-进气口(风挡位臵)传感器电路故障;33-模式(风挡位臵)传感器电路故障;43-模式控制伺服电机电路故障。清除故障码，所有故障代码都不能清除。出风口只能吹前风挡玻璃位臵和脚部位臵，面部位臵一直不能出风。 客户反映，该车已在多家维修站进行过维修，但前后历时两个多月时间始终未能确定故障原因。其他维修人员都怀疑是A/C控制面板总成故障，但是很难找到同一型号的A/C控制面板总成供他们互换，所以不敢拿出肯定的结论。 根据出现多个故障码且不能清除，初步判断主要原因可能有3种:?传感器的共用电源或接地电路故障;?传感器或其电路故障;?A/C控制面板总成(与放大器做成一体)内部集成电路故障。 首先，对A/C控制面板总成的主要工作电源及搭铁端子进行检测，各端子检测结果都在正常范围。 室内温度在30?时，室内温度传感器端子电压为1.8V，蒸发器温度传感器端子电压1.2V，都在正常范围内。为什么电压正常还报故障码呢?由于很难找到与本车型号一致的A/C控制面板总成，把本车型号为-的A/C控制面板总成，安装在同一车型A/C控制面板总成型号为-的车辆上，故障码全部可以清除，各伺服电机工作正常，只是压缩机不能工作。通过两种不同型号的A/C控制面板总成电路图可以看出，两者唯一的区别就是压缩机控制条件不同。虽然压缩机不能工作，但其它功能Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 可以恢复正常，故障代码可以清除，至少不能确定故障车辆的A/C控制面板总成就已经损坏。 将故障车辆仪表台拆下，对空调系统线束进行检查。根据电路图2，检测到传感器及伺服电机共用接地端子SG(C17)端子时，发现在关闭点火开关的情况下，SG端子与车身接地导通，电阻只为0.8Ω;打开点火开关，SG(C17)端子与车身接地导通，电阻却为40Ω。那为什么电阻会有如此大变化呢?从A/C控制面板总成电路板上可以测得SG(C17)端子与GND(A23-6)车身接地端子直接连接在一起，是电脑内部搭铁点。直接给SG端子跨接搭铁线，打开点火开关电阻变为6Ω，说明是A/C面板控制器与其连接插头虚接不实。对该端子进行处理，打开空调开关，伺服电机工作正常，压缩机也能正常运转。 故障端子处理后，重新安装仪表台，再次打开空调开关，压缩机又不运转了，故障为何又重现了呢?不安装仪表台时，压缩机工作正常，安装仪表台后，压缩机就不工作。拆装仪表台哪里有和空调系统有联系的呢?经分析，只有日光传感器在拆下仪表台后是没有与A/C控制面板总成连接的，再次拔下日光传感器连接线，“啪”的一声，压缩机电磁离合器吸合了。用万用表检测日光传感器端子侧5号端子有12.5V电压(如图3)，4号端子接地，1号端子1.11V电压，都在正常范围内;测得2号端子有10.55V电压，正常在0.8,3.1V之间，拔下日光传感器连接器插头，用万用表检测日光传感器2号端子与5号端子发现已经短路。由于2号端子电压过高，A/C控制面板总成不能处理该信号，而使其处于保护状态。更换日光传感器，经多次试车，故障没有出现。 维修小结 Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 该故障因SG(C17)端子连接不良，造成电阻过大的现象，应是其他维修人员检测线路时，往该端子内插入类似于大头针的工具造成的。建议在维修过程中，当遇到多个故障代码同时出现，首先要考虑其电源、接地及线路的共用部分。 在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它。但恰好故障的根本原因，就是日光传感器短路的问题。假设日光传感器出现断路状况，它并不会影响压缩机的正常运转，只报出相应的故障代码，所以我们在维修中一定要按部就班一步一步检查，不要忽略任何可疑细节。 该车因存在多处故障点，历经了多家修理厂都未能查出故障原因，结果还人为造成了多处故障，如SG(C17)端子连接不良，电阻过大的现象。这说明很多维修技术人员在进行维修作业时，存在粗心大意、不懂乱修的问题。而本文作者在对这起复杂的故障案例排除过程中，始终保持了清醒的头脑，从开始对空调ECU元件性能的判断，到最终实际故障点的确认，整体的思路非常清晰。尤其值得表扬的是作者对整个故障排除流程的把控，在遇到问题时，进行缜密分析，没有出现随意更换零件的问题。 作者对故障码的处理方法非常到位，在了解了车辆的维修历史、读取了相应的故障码后，根据多故障码同时出现的现象，确定了故障的范围，为后面的维修打下了良好的基础。接着进行的有针对性的检测，发现空调ECU的基础电压、传感器信号在正常范围。显然，作者在进行这项检查时，并没有深入到位，像SG(C17)端子连接不良，电阻过大的问题，并没有及时的检查出来，而是采用了更换零件验证的方式，间接验证了空调控制面板没有问题。接下来的检查，才发现了SG(C17)端子连接Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 不良的问题。处理故障点后空调能够正常工作，作者本以为找到了故障点，但接下来的仪表板安装却将故障带回了原点。我相信，作者开始脑子里充满的肯定是认为控制面板有偶发性故障，但后来的理性分析，使作者考虑到了拆装仪表台前后的区别就是“阳光传感器”! 阳光传感器这个不起眼的“小家伙”的作用，就是给空调ECU提供外界阳光强度的信号，使空调ECU更精确地控制制冷系统的工作强度，从而提高空调的舒适度。阳光传感器安装在仪表板上侧，在空调系统AUTO模式下，当日照量增加时，输出电压上升，空调ECU控制制冷系统增加制冷量，提高室内的舒适度;反之，当日照量减少时，输出电压下降，则降低空调的制冷强度，防止温度过低的情况出现。诚然也像作者总结的，在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它，但恰好故障的根本原因就是日光传感器短路的问题。 接车后连接丰田专用诊断仪DST-II，启动发动机，打开空调开关，发动机系统数据流显示空调开关信号及电磁离合器继电器信号一直处于OFF状态。打开前机舱盖，发现压缩机不工作，但是空调控制面板A/C指示灯并没有闪烁。该车空调诊断系统没有设计与诊断连接器(DLC)通讯，只能通过控制面板自诊断功能所提供的故障代码进行判断。 如图1所示，同时按下空调控制面板的AUTO开关和进气控制开关，将点火开关拧至ON，控制面板内的所有的运行显示器和温度设臵功能显示都应点亮，在1秒内亮灭4次后，进行记录故障输出，故障码为:11-车内温度传感器电路故障;13-蒸发器温度传感器电路故障;21-日光传感器(乘客侧)电路故障;24-日光传感器(驾驶员侧)电路故障;32-进气口(风挡位臵)传感器电Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 路故障;33-模式(风挡位臵)传感器电路故障;43-模式控制伺服电机电路故障。清除故障码，所有故障代码都不能清除。出风口只能吹前风挡玻璃位臵和脚部位臵，面部位臵一直不能出风。 客户反映，该车已在多家维修站进行过维修，但前后历时两个多月时间始终未能确定故障原因。其他维修人员都怀疑是A/C控制面板总成故障，但是很难找到同一型号的A/C控制面板总成供他们互换，所以不敢拿出肯定的结论。 根据出现多个故障码且不能清除，初步判断主要原因可能有3种:?传感器的共用电源或接地电路故障;?传感器或其电路故障;?A/C控制面板总成(与放大器做成一体)内部集成电路故障。 首先，对A/C控制面板总成的主要工作电源及搭铁端子进行检测，各端子检测结果都在正常范围。 室内温度在30?时，室内温度传感器端子电压为1.8V，蒸发器温度传感器端子电压1.2V，都在正常范围内。为什么电压正常还报故障码呢?由于很难找到与本车型号一致的A/C控制面板总成，把本车型号为-的A/C控制面板总成，安装在同一车型A/C控制面板总成型号为-的车辆上，故障码全部可以清除，各伺服电机工作正常，只是压缩机不能工作。通过两种不同型号的A/C控制面板总成电路图可以看出，两者唯一的区别就是压缩机控制条件不同。虽然压缩机不能工作，但其它功能可以恢复正常，故障代码可以清除，至少不能确定故障车辆的A/C控制面板总成就已经损坏。 将故障车辆仪表台拆下，对空调系统线束进行检查。根据电路图2，检测到传感器及伺服电机共用接地端子SG(C17)端子时，发现在关闭点火开关的情况下，SG端子与车身接地导通，电阻只为0.8Ω;打开点火开关，SG(C17)端子与车身接地Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 导通，电阻却为40Ω。那为什么电阻会有如此大变化呢?从A/C控制面板总成电路板上可以测得SG(C17)端子与GND(A23-6)车身接地端子直接连接在一起，是电脑内部搭铁点。直接给SG端子跨接搭铁线，打开点火开关电阻变为6Ω，说明是A/C面板控制器与其连接插头虚接不实。对该端子进行处理，打开空调开关，伺服电机工作正常，压缩机也能正常运转。 故障端子处理后，重新安装仪表台，再次打开空调开关，压缩机又不运转了，故障为何又重现了呢?不安装仪表台时，压缩机工作正常，安装仪表台后，压缩机就不工作。拆装仪表台哪里有和空调系统有联系的呢?经分析，只有日光传感器在拆下仪表台后是没有与A/C控制面板总成连接的，再次拔下日光传感器连接线，“啪”的一声，压缩机电磁离合器吸合了。用万用表检测日光传感器端子侧5号端子有12.5V电压(如图3)，4号端子接地，1号端子1.11V电压，都在正常范围内;测得2号端子有10.55V电压，正常在0.8,3.1V之间，拔下日光传感器连接器插头，用万用表检测日光传感器2号端子与5号端子发现已经短路。由于2号端子电压过高，A/C控制面板总成不能处理该信号，而使其处于保护状态。更换日光传感器，经多次试车，故障没有出现。 维修小结 该故障因SG(C17)端子连接不良，造成电阻过大的现象，应是其他维修人员检测线路时，往该端子内插入类似于大头针的工具造成的。建议在维修过程中，当遇到多个故障代码同时出现，首先要考虑其电源、接地及线路的共用部分。 在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它。但恰好故Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 障的根本原因，就是日光传感器短路的问题。假设日光传感器出现断路状况，它并不会影响压缩机的正常运转，只报出相应的故障代码，所以我们在维修中一定要按部就班一步一步检查，不要忽略任何可疑细节。 该车因存在多处故障点，历经了多家修理厂都未能查出故障原因，结果还人为造成了多处故障，如SG(C17)端子连接不良，电阻过大的现象。这说明很多维修技术人员在进行维修作业时，存在粗心大意、不懂乱修的问题。而本文作者在对这起复杂的故障案例排除过程中，始终保持了清醒的头脑，从开始对空调ECU元件性能的判断，到最终实际故障点的确认，整体的思路非常清晰。尤其值得表扬的是作者对整个故障排除流程的把控，在遇到问题时，进行缜密分析，没有出现随意更换零件的问题。 作者对故障码的处理方法非常到位，在了解了车辆的维修历史、读取了相应的故障码后，根据多故障码同时出现的现象，确定了故障的范围，为后面的维修打下了良好的基础。接着进行的有针对性的检测，发现空调ECU的基础电压、传感器信号在正常范围。显然，作者在进行这项检查时，并没有深入到位，像SG(C17)端子连接不良，电阻过大的问题，并没有及时的检查出来，而是采用了更换零件验证的方式，间接验证了空调控制面板没有问题。接下来的检查，才发现了SG(C17)端子连接不良的问题。处理故障点后空调能够正常工作，作者本以为找到了故障点，但接下来的仪表板安装却将故障带回了原点。我相信，作者开始脑子里充满的肯定是认为控制面板有偶发性故障，但后来的理性分析，使作者考虑到了拆装仪表台前后的区别就是“阳光传感器”! 阳光传感器这个不起眼的“小家伙”的作用，就是给空调Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact ECU提供外界阳光强度的信号，使空调ECU更精确地控制制冷系统的工作强度，从而提高空调的舒适度。阳光传感器安装在仪表板上侧，在空调系统AUTO模式下，当日照量增加时，输出电压上升，空调ECU控制制冷系统增加制冷量，提高室内的舒适度;反之，当日照量减少时，输出电压下降，则降低空调的制冷强度，防止温度过低的情况出现。诚然也像作者总结的，在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它，但恰好故障的根本原因就是日光传感器短路的问题。 接车后连接丰田专用诊断仪DST-II，启动发动机，打开空调开关，发动机系统数据流显示空调开关信号及电磁离合器继电器信号一直处于OFF状态。打开前机舱盖，发现压缩机不工作，但是空调控制面板A/C指示灯并没有闪烁。该车空调诊断系统没有设计与诊断连接器(DLC)通讯，只能通过控制面板自诊断功能所提供的故障代码进行判断。 如图1所示，同时按下空调控制面板的AUTO开关和进气控制开关，将点火开关拧至ON，控制面板内的所有的运行显示器和温度设臵功能显示都应点亮，在1秒内亮灭4次后，进行记录故障输出，故障码为:11-车内温度传感器电路故障;13-蒸发器温度传感器电路故障;21-日光传感器(乘客侧)电路故障;24-日光传感器(驾驶员侧)电路故障;32-进气口(风挡位臵)传感器电路故障;33-模式(风挡位臵)传感器电路故障;43-模式控制伺服电机电路故障。清除故障码，所有故障代码都不能清除。出风口只能吹前风挡玻璃位臵和脚部位臵，面部位臵一直不能出风。 客户反映，该车已在多家维修站进行过维修，但前后历时两个多月时间始终未能确定故障原因。其他维修人员都怀疑是A/C控制面板总成故障，但是很难找到同一型号的A/C控制面Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 板总成供他们互换，所以不敢拿出肯定的结论。 根据出现多个故障码且不能清除，初步判断主要原因可能有3种:?传感器的共用电源或接地电路故障;?传感器或其电路故障;?A/C控制面板总成(与放大器做成一体)内部集成电路故障。 首先，对A/C控制面板总成的主要工作电源及搭铁端子进行检测，各端子检测结果都在正常范围。 室内温度在30?时，室内温度传感器端子电压为1.8V，蒸发器温度传感器端子电压1.2V，都在正常范围内。为什么电压正常还报故障码呢?由于很难找到与本车型号一致的A/C控制面板总成，把本车型号为-的A/C控制面板总成，安装在同一车型A/C控制面板总成型号为-的车辆上，故障码全部可以清除，各伺服电机工作正常，只是压缩机不能工作。通过两种不同型号的A/C控制面板总成电路图可以看出，两者唯一的区别就是压缩机控制条件不同。虽然压缩机不能工作，但其它功能可以恢复正常，故障代码可以清除，至少不能确定故障车辆的A/C控制面板总成就已经损坏。 将故障车辆仪表台拆下，对空调系统线束进行检查。根据电路图2，检测到传感器及伺服电机共用接地端子SG(C17)端子时，发现在关闭点火开关的情况下，SG端子与车身接地导通，电阻只为0.8Ω;打开点火开关，SG(C17)端子与车身接地导通，电阻却为40Ω。那为什么电阻会有如此大变化呢?从A/C控制面板总成电路板上可以测得SG(C17)端子与GND(A23-6)车身接地端子直接连接在一起，是电脑内部搭铁点。直接给SG端子跨接搭铁线，打开点火开关电阻变为6Ω，说明是A/C面板控制器与其连接插头虚接不实。对该端子进行处理，打开空调开关，伺服电机工作正常，压缩Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 机也能正常运转。 故障端子处理后，重新安装仪表台，再次打开空调开关，压缩机又不运转了，故障为何又重现了呢?不安装仪表台时，压缩机工作正常，安装仪表台后，压缩机就不工作。拆装仪表台哪里有和空调系统有联系的呢?经分析，只有日光传感器在拆下仪表台后是没有与A/C控制面板总成连接的，再次拔下日光传感器连接线，“啪”的一声，压缩机电磁离合器吸合了。用万用表检测日光传感器端子侧5号端子有12.5V电压(如图3)，4号端子接地，1号端子1.11V电压，都在正常范围内;测得2号端子有10.55V电压，正常在0.8,3.1V之间，拔下日光传感器连接器插头，用万用表检测日光传感器2号端子与5号端子发现已经短路。由于2号端子电压过高，A/C控制面板总成不能处理该信号，而使其处于保护状态。更换日光传感器，经多次试车，故障没有出现。 维修小结 该故障因SG(C17)端子连接不良，造成电阻过大的现象，应是其他维修人员检测线路时，往该端子内插入类似于大头针的工具造成的。建议在维修过程中，当遇到多个故障代码同时出现，首先要考虑其电源、接地及线路的共用部分。 在车间内维修时，光照强度较弱，日光传感器报故障代码是一种正常现象，在维修过程中，一般都会忽略它。但恰好故障的根本原因，就是日光传感器短路的问题。假设日光传感器出现断路状况，它并不会影响压缩机的正常运转，只报出相应的故障代码，所以我们在维修中一定要按部就班一步一步检查，不要忽略任何可疑细节。 该车因存在多处故障点，历经了多家修理厂都未能查出故障原因，结果还人为造成了多处故障，如SG(C17)端子连接不Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 良，电阻过大的现象。这说明很多维修技术人员在进行维修作业时，存在粗心大意、不懂乱修的问题。而本文作者在对这起复杂的故障案例排除过程中，始终保持了清醒的头脑，从开始对空调ECU元件性能的判断，到最终实际故障点的确认，整体的思路非常清晰。尤其值得表扬的是作者对整个故障排除流程的把控，在遇到问题时，进行缜密分析，没有出现随意更换零件的问题。 作者对故障码的处理方法非常到位，在了解了车辆的维修历史、读取了相应的故障码后，根据多故障码同时出现的现象，确定了故障的范围，为后面的维修打下了良好的基础。接着进行的有针对性的检测，发现空调ECU的基础电压、传感器信号在正常范围。显然，作者在进行这项检查时，并没有深入到位，像SG(C17)端子连接不良，电阻过大的问题，并没有及时的检查出来，而是采用了更换零件验证的方式，间接验证了空调控制面板没有问题。接下来的检查，才发现了SG(C17)端子连接不良的问题。处理故障点后空调能够正常工作，作者本以为找到了故障点，但接下来的仪表板安装却将故障带回了原点。我相信，作者开始脑子里充满的肯定是认为控制面板有偶发性故障，但后来的理性分析，使作者考虑到了拆装仪表台前后的区别就是“阳光传感器”! 阳光传感器这个不起眼的“小家伙”的作用，就是给空调ECU提供外界阳光强度的信号，使空调ECU更精确地控制制冷系统的工作强度，从而提高空调的舒适度。阳光传感器安装在仪表板上侧，在空调系统AUTO模式下，当日照量增加时，输出电压上升，空调ECU控制制冷系统增加制冷量，提高室内的舒适度;反之，当日照量减少时，输出电压下降，则降低空调的制冷强度，防止温度过低的情况出现。诚然也像作者总结的，Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact 在车间内维修时，光照强度较弱，日光传感器报故障代码是一 种正常现象，在维修过程中，一般都会忽略它，但恰好故障的 根本原因就是日光传感器短路的问题。 Vertically split casing pump body should not be removable and washable. 3.8.1.4 pumps shall conform to the technical level of vertical and horizontal documents. If there is no provision, in General, the following requirements: the overall installation of pumps, axial horizontal deviation of not more than 0.1/1000 horizontal deviation is less than 0.2/1000; level the measurement flange should be on a level surface or on the horizontal surface of the pump body. Disintegration of the installation of the pump, the level of vertical and horizontal deviation shall be no greater than 0.05/1000; level of horizontal split casing, the exposed part of the shaft or base on a level work surface. 3.8.1.5 alignment, the following requirements of the pump: pump and driven half coupling of radial displacement of the machine-side clearance, axis tilt shall comply with the technical file requirements. When provided, must meet the following requirements: ... Coupling diameter d (mm) radial displacement mm two-axis tilt 0.5/10007~9 of steam turbine-driven pumps and transport high temperature liquid pumps, State at room temperature when aligning should be reserved in accordance with design compensation when its temperature changes. 3.8.1.6 bearing Assembly check that the pump bearing (thick tile), Watts and Watts should fit tightly on the back, the interference values such as device files should be provided as 0.02~0.04mm, bearing and axle journal and the top layer and the shell should be good, without hierarchy, as it emerges, the alloy surface and surface layer and surface should be smooth, free of cracks, pores, skin, slag and scratches, and other defects. Bearing and journal of exposure should be good, contacts within the contact should be uniform, no square centimeter 2~4 a point, contact point shall conform to the technical documents of, such as technical documentation not required, you should comply with the following requirements: when diluted oil lubrication, the tile on contact angle of 130 ?, contact