【摘要】：一辆行驶里程约KM，采用了德尔福（DELPHI）MT20U2发动机管理系统和“重庆集成” 发动机防盗系统的长安奔奔SC7133轿车。
车主反映：该车在停车后再次起动时，发动机起动不着。
接车后首先试车，故障如上所述。把点火开关拧到ON档，发动机故障指示灯不亮，防盗指示灯闪亮，出现这种情况的原因是发动机的防盗系统被锁止。
用长安电喷检测仪KT600进入“集成防盗”，发现有故障码B042 (R-line对搭铁短路) 存储。意思是ECM未匹配，重新匹配ECM。用长安汽车电喷检测仪重新匹配ECM后，断开点火开关，再把点火开关拧到ON档，发动机故障指示灯亮，防盗指示灯熄灭。表示匹配成功，可以起动发动机。
再次打车，发动机还是起动不着，发动机故障灯点亮。用长安汽车电喷检测仪进入“长安汽车”→ “长安奔奔” →德尔福MT20U2→读故障码为P0230 (燃油泵控制线路故障)。为了验证该故障码的真实性，直接把燃油泵继电器的30脚和87脚短接，然后起动发动机，起动成功，这就确定P0230故障码是真实的。经检查燃油泵继电器及其控制线路均正常，最后判断是ECM故障，需更换ECM。
更换ECM并且进行防盗匹配后，可以起动发动机，但故障灯仍点亮。用长安电喷检测仪KT600检测时有P1336 (齿讯未学习) 的故障码存储，用长安汽车电喷检测仪清除故障码后，再次起动发动机，故障灯仍亮。
经咨询厂家技术人员得知，在对新装版奔奔机械油门车辆进行维修时，如果进行ECM的更换，需要进行齿讯学习，否则起动后故障灯点亮，诊断仪显示P1336齿讯未学习的故障码。
故障排除按照厂家提供的步骤进行齿讯学习，具体操作如下。
1) 连接KT600诊断仪，起动发动机，用诊断仪进入“长安汽车” →“长安奔奔” →德尔福MT20U2→读系统参数，查看发动机冷却液温度数值。等待温度达到60 ℃以上，保持车辆其他电器负载处于关闭状态。bj20最新消息
宝腾汽车2) 进入诊断仪的“齿讯学习” 项目，按“确认” 键，诊断仪显示“将油门踏到底”。
3) 将油门踏板踩到底并保持，此时发动机转速会在1 300～4 500 r / min自动往复2～5次，之后在4 500 r / min附近振荡，学习结束(以上为进行齿讯学习时发动机转速的典型特征，可由此判断齿讯学习是否进行及结束，如果无此现象，则说明发动机控制单元没有进入学习状态，应从头开始)。
4) 发动机熄火。
5) 断电10 s后起动发动机，清除故障码，故障即可排除。
按照上述方法清除故障码后，起动发动机，发动机故障灯熄灭。经过试车，发动机故障灯没有点亮，至此该车故障彻底排除。
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
维特尔离开法拉利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置功能显示都应点亮，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-
reform results, economy, and political system, and culture system, and social system, and discipline check system, and party of construction system reform solid advance, tax, and financial, and price, and administrative approval, and State-owned enterprises, and ecological civilization, important field and key link reform made major progress, market in resources configuration in the of decisive role si
gnificantly enhanced, Unprecedented burst of momentum and vitality of economic and social development. XI General Secretary's speech in this regard include the reform only when there is no complete, the < decisions of the CPC Central Committee on some major problems in deepening reform > notes on the 18 session of ideas into the party's spirit of the reforms more difficult to move forward, the increasing use of the Socialist system with Chinese characteristics such as the ability to run the country. 4. with regard to promoting sustained and healthy economic development. Face complex changeable of international situation
河南省汽车违章查询and difficult heavy of domestic reform development stable task, XI General Secretary made China economic development into new normal of science judge, proposed innovation, and coordination, and green, and open, and shared five big development concept, implementation macro policy to stability, and industry policy to associate, and micro policy to live, and reform policy to real, and social policy to backing five big pillar sex policy, vigorously advance supply side structural reform, new concept, achieved has 2013 to 2015 during, Domestic production total annual growth 7.3%, obviously fast Yu earlier world economic 2.3% of annual growth, on world economic growth of contribution over 25%, tertiary industry accounted for domestic production total share over 50%, eventually consumption on economic growth of contribution rate reached 66%, economic structure a
djustment made important progress, development of quality and benefits significantly upgrade, China economic show out huge of swing room and broad of
development prospects. This aspects XI General Secretary of speech main including economic growth must is real and no water of growth improve open type economic level "see missing of hand" and "see have see of hand" are to with good speed up from elements drive, and investment scale drive development mainly to to innovation drive development mainly of change active promoted China energy production and consumption revolution,. 5. with regard to building the rule of law in China. 18 big yilai, Central tightly around full advance law ruling, put party of led, and people masters, and law ruling organic unified up, insisted law ruling, and law ruling, and law administrative common advance, insisted rule of law national, and rule of law Government, and rule of law social one construction, full advance science legislation, and strictly law enforcement, and just judicial, and universal law-abiding, China features socialist legal system further sound perfect, leaders at all levels cadres using rule of law thinking and rule of law way
deepening reform, and
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(风挡位置)传感器电路故障;33-模式(风挡位置)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置和脚部位置，面部位置一直不能出风。
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：①传感器的共用电源或接地电路故障;②传感器或其
电路故障;③A/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 违章处理 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
中型客车多少座电压正常还报故障码呢?由于很难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promoted development, and The ability to resolve conflicts and constantly improve, our ... 6. on the building of Socialist culture in China. A country, a nation strong, always supported by culture flourished, the inheritance and development of civilization, without culture to develop and prosper, there will be no realization of the dream of China. 18 big yilai, XI General Secretary around "foster and promote Socialist core values" "promote China excellent traditional culture" "firmly master ideology work led right and discourse right", aspects do h
as series important speech, main including put publicity thought work do have better for achieved China dream condensed powerful moral support improve national culture soft strength foster and promote Socialist core values youth to consciously practice line Socialist core values Childhood actively cultivate and practice the core values of socialism and the party's important speech on the press conference. 7. promote the reform and development of social undertakings and social
management. 18 big yilai, Central insisted put guarantees and improved livelihood as ruling acting political of starting point and foothold, Xia big pneumatic solution masses most care most directly most reality of interests problem, 3 years cumulative reduction poverty more than 50 million people, equivalent to a medium national population of total, annual added town employment more than 10 million people, starts construction supportability housing engineering near 4 million sets, built world Shang scale maximum, and cover universal of basic medical guarantees network and pension guarantees network, urban and rural residents income continued growth, The lives of the people of all ethnic groups have more on both material and spiritual thriving. This aspects XI General Secretary of speech main including promoted poverty area poverty, and speed up development let 1.3 billion people enjoys better more fair of education speed up advance housing guarantees and supply system construction always put people life
security put in first bit efforts put China construction became network power insisted general national security views, go China features national security road effective maintenance national security and social settled,. 8. with regard to comprehensive strictly administering the party. Party of 18 big yilai, Central station in party and national survival of height, firmly grasp strengthening party of ruling capacity construction, and advanced purity construction this article mainline, to style construction for breakthrough, to developed introduced eight items provides started start, put discipline and rules is in front, organization carried out has party of mass line education practice activities and "three strict three real" topic education, insisted "zero tolerance, and full cover, and no area", insisted "Tiger" "flies" with playing, style political wind society continued improved, More perfect system of laws within the party, discipline of authoritative seriousness increasing, for the history of winning has a lot of new features provide a strong
political
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
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
crv2013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)端子连接不良的问题。处理故障点后空调能够正常工作，作者本以为到了故障点，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
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