P0700 OBD-II：变速器控制系统（MIL请求） OBD-II故障代码P0700是什么意思？
OBD-II代码P0700被定义为变速器控制系统故障。
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。
See_also: P0011 OBD II故障代码 当动力总成计算机中设置代码P0700时，表示动力总成计算机或PCM发现输入转速传感器和变速器输出转速传感器之间的转速差大于规定转速。 这种情况可能发生在换挡时或在同一挡位以稳定速度行驶时。 这通常意味着变速器打滑。
有此故障代码的车辆应送至修理厂进行诊断。 查找修理厂
P0700症状
- 发动机检查指示灯点亮
- 车辆无法正常换档
- 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，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。
触发P0700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
- 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。
面向修理厂和技术人员的P0700诊断理论
在诊断P0700代码时，重要的是记录冻结帧信息，然后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P0700可能很难检测到。
应在车辆预热且燃油系统处于闭环后，在光滑、平坦的表面上监测转速输入速度，并将其与输出转速进行比较。 监测变矩器锁止电磁阀对加大油门的响应。 当节气门位置传感器的工作周期高于40%时，锁止电磁阀的工作周期应降至0%，并应恢复至100%。当车速在45英里/小时以上时，当节气门恢复到15%至20%时，占空比应降至0%。 当完全松开节气门或当车辆减速到30英里/小时以下时，锁止电磁阀占空比应降至0%。 无论车速如何，只要踩下制动踏板，锁止电磁阀占空比应降至0%。
See_also: P0059 OBD II故障代码 当查看扭矩转换器转速与输入轴转速时，观察扫描工具数据是否有转换器滑动速度PID或参数标识。 这对诊断间歇性P0700很有帮助。 如果锁止系统正常工作，滑动速度值绝不应超过50 RPM。 尝试在45 mph以上的缓坡上轻踩油门。如果滑动速度增加，并且锁止电磁阀的工作周期为100%，即完全应用变矩器离合器，则说明变矩器离合器打滑。
如果打滑速度保持稳定，但变速器输出轴速度开始下降（与英里/小时一起），则说明变速器内部打滑，通常由离合器组或斯普拉格单向离合器磨损引起。 如果打滑速度仍然很高，而锁止占空比为100%，则说明电磁阀可能存在故障，因为占空比为报告PCM命令锁止系统工作，但没有变化。 即使是磨损的变矩器离合器，也总是有某种滑动速度读数。 每当油门踩下时，它可能会变得很高，但变矩器速度和输入轴速度之间应该有某种转速降低，以验证锁止电磁阀和PCM正在努力完成其工作。工作机会
Ronald Thomas
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