P0126 OBD-II: Insufficient Coolant Temperature for Stable Operation OBD-II故障代码P0126是什么意思？
OBD-II代码P0126被定义为 "冷却液温度不足，无法稳定工作"。
这意味着什么？
See_also: P052D OBD II故障代码 为了使动力总成控制模块（PCM）有效地控制燃油和点火系统，同时最大限度地减少车辆的排放，发动机冷却系统必须达到一个临界工作温度。 这个温度通常在160-170华氏度之间，并且必须在 "冷启动 "后15分钟内达到。 如果天气非常寒冷、如果冷却液温度保持在 160-170 度范围以下，或在该水平上下徘徊，则 PCM 无法依靠排气温度来启动车辆。当出现这种情况时，PCM必须依靠一种粗糙的 "limp home "类型的燃油和点火控制程序。 这将使废气污染水平上升到不可接受的高水平，并触发发动机检查指示灯。
有此故障代码的车辆应送至修理厂进行诊断。 查找修理厂
P0126 症状
- 发动机检查指示灯点亮
- 车辆在高速公路上高速行驶时可能无法换入最高档位
- 燃油经济性降低
- 在特殊情况下，驾驶员没有发现任何不利条件
触发P0126代码的常见问题
- 发动机节温器故障
- 发动机冷却液温度传感器故障
- 进气温度传感器故障
- 冷却系统故障
- 发动机冷却液过低
- 发动机冷却液不清洁，导致冷却液温度传感器读数不正确
- 发动机冷却风扇故障，始终运转
常见误诊
- 发动机冷却风扇
- 发动机内部问题
- 氧传感器问题
- 发动机冷却液温度传感器问题
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。
面向修理厂和技术人员的P0126诊断理论
以下是诊断P0126代码的方法：
See_also: P003A OBD II故障代码- 记录冻结帧数据对确定哪种运行模式设置了代码至关重要。 密切关注 MPH、TPS、LOAD、RPM，当然还有发动机冷却液温度和进气温度。 这些值将有助于确定车辆是在高速公路上行驶还是在城镇中以较慢的速度行驶。
- 连接扫描仪，为发动机传感器选择最接近原厂的数据流。 启动车辆（确保加热器关闭），观察冷却液温度值的变化。
- 如果冷却液温度读数在15分钟内不超过160-170º F，则节温器很可能是罪魁祸首。
- 请务必验证发动机冷却液温度读数是否与实际情况相符，因此请使用激光测温仪测量发动机温度，以免将冷却液温度传感器、其连接或电路电阻过高造成的故障错误归咎于发动机冷却系统。
在进行P0126诊断时，务必确认电动或机械冷却风扇没有卡在 "接通 "位置，因为这将导致发动机在非常低的工作温度下运行。一个好的经验法则是，热车后进气温度读数通常比冷却液温度读数低约100º F。 冷启动车辆时，开始读数应几乎相同。
Ronald Thomas
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