P0758 OBD-II：换档电磁阀 "B "电气 OBD-II故障代码P0758是什么意思？
OBD-II代码P0758定义为换档电磁阀B电气故障。
自动变速器的目的是通过自动选择不同的齿轮比或 "速度 "为车轮提供动力，使发动机的最佳功率和扭矩特性与驾驶员所需的加速度和速度相匹配。 换挡电磁阀B可使变速器从2挡换入3挡。 它通过重新引导变速器油的流向来实现这一目的，从而改变齿轮比或 "速度"。换向阀在阀体中的位置。
See_also: P0712 OBD II故障代码 当代码P0758被设置在动力总成计算机中时，它意味着动力总成计算机或PCM在从2档换到3档时没有看到规定的转速变化。 它也没有从车速传感器中看到正确的路速增加。
See_also: P0263 OBD II故障代码 有此故障代码的车辆应送至修理厂进行诊断。 查找修理厂
P0758 症状
- 发动机检查指示灯点亮
- 车辆不能正常从2档换到3档
- 燃油经济性降低
- 在特殊情况下，驾驶员未发现任何不利条件
- 在某些情况下，可能会出现性能问题和类似失火的症状。
引发P0758代码的常见问题
- 换档电磁阀故障
- 换档电磁阀接线或连接器故障
- 阀体故障
- 变速器油变脏，导致液压通道受限
常见误诊
排放的污染气体
- HCs（碳氢化合物）：未燃烧的原燃料液滴，有异味，影响呼吸，导致烟雾。
- CO（一氧化碳）：部分燃烧的燃料，是一种无味的致命有毒气体。
- NOX（氮氧化物）：在阳光照射下导致烟雾的两种成分之一。
P0758 车间和技术人员诊断理论
在诊断 P0758 代码时，重要的是记录冻结帧信息，然后以每小时 15-35 英里左右的速度试车，复制代码设置条件。 从静止开始，然后轻轻加速。 观察扫描数据，查看 PCM 是否命令电磁阀换档。 如果 PCM 发出 2-3 档换档命令，但车辆不能正确地从 2 档换到 3 档，则说明 P0758 错误。下一步是对换档电磁阀进行精确测试，例如电压下降和通断测试。 我通常会对线束进行反向探测，这样就不必拆卸变速器。 而且，始终要检查油液的状况。 油液是脏的、棕色的、烧焦的还是透明的红莓色？
Ronald Thomas
Jeremy Cruz is a highly experienced automotive enthusiast and a prolific writer in the field of auto repair and maintenance. With a passion for cars that dates back to his childhood days, Jeremy has devoted his career to sharing his knowledge and expertise with consumers who seek reliable and accurate information about keeping their vehicles running smoothly.As a trusted authority in the automotive industry, Jeremy has worked closely with leading manufacturers, mechanics, and industry experts to gather the most up-to-date and comprehensive knowledge in auto repair and maintenance. His expertise extends to a wide range of topics, including engine diagnostics, routine maintenance, troubleshooting, and performance enhancement.Throughout his writing career, Jeremy has consistently provided consumers with practical tips, step-by-step guides, and trusted advice on all aspects of auto repair and maintenance. His informative and engaging content allows readers to understand complex mechanical concepts easily and empowers them to take control of their vehicle's well-being.Beyond his writing skills, Jeremy's genuine love for automobiles and innate curiosity have driven him to constantly stay abreast of emerging trends, technological advancements, and industry developments. His dedication to informing and educating consumers has been recognized by loyal readers and professionalsalike.When Jeremy isn't immersed in automobiles, he can be found exploring scenic driving routes, attending car shows and industry events, or tinkering with his own collection of classic cars in his garage. His commitment to his craft is fueled by his desire to help consumers make informed decisions about their vehicles and ensure they have a smooth and enjoyable driving experience.As the proud author of the blog for the leading provider of auto repair and maintenance information to consumers, Jeremy Cruz continues to be a reliable source of knowledge and guidance for car enthusiasts and everyday drivers alike, making the road a safer and more accessible place for all.
