P0780 OBD-II：换挡错误 OBD-II故障代码P0780是什么意思？
OBD-II代码P0780被定义为变速器换档故障。
See_also: P073E OBD II故障代码 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。
当动力总成计算机中设置代码P0780时，意味着动力总成计算机或PCM在变速器换挡时发现输入轴和变速器输出轴之间的转速差大于或小于规定的转速差。 这可能发生在换挡过程中或在同一挡位以稳定速度行驶时。 这通常意味着变速器出现故障。滑动或换档不当。
有此故障代码的车辆应送至修理厂进行诊断。 查找修理厂
P0780 症状
- 发动机检查指示灯点亮
- 车辆无法正常换挡
- 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，例如在高速公路上行驶后停车时熄火和/或出现类似失火的症状。
引发P0780代码的常见问题
- 换档电磁阀故障
- 发动机冷却液温度传感器故障
- 变矩器锁止电磁阀故障
- 变矩器离合器故障
- 变速箱测距仪故障
- 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。
P0780 车间和技术人员诊断理论
当诊断P0780代码时，重要的是记录任何其他代码和P0780冻结帧数据。 然后，应通过试车重复代码设置条件。 密切注意发动机负荷、节气门位置、转速和路速，因为P0780可能很难检测到。
应在车辆预热且燃油系统处于闭环状态后，在光滑、平坦的路面上监测转速输入速度，并将其与输出转速进行比较。 从静止状态起步，轻轻加速至冻结帧中记录的英里/小时范围。 观察串行换档电磁阀PID，并确定它们是否合理，即变速器是否平稳换档。如果有，则表明变速器打滑，并可能验证P0780代码。
See_also: P2681 OBD II故障代码
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.
