P0114 OBD-II：进气温度传感器1电路间歇性 OBD-II故障代码P0114是什么意思？
OBD-II代码P0114被定义为进气温度电路间歇性故障。
进气温度传感器测量进气歧管内空气温度的上升和下降，为动力总成控制模块（PCM）提供控制空燃比、点火正时和排放控制系统许多组件所需的关键数据。
See_also: P0328 OBDII故障代码 当进气温度传感器电路给PCM的电压信号不稳定和/或忽高忽低时，代码P0114设定。
See_also: P2174 OBD II故障代码 P0114症状
- 发动机检查指示灯点亮
- 在某些情况下，发动机可能难以启动和/或燃油经济性差
- 发动机性能差/加速迟滞
触发P0114代码的常见问题
- 进气温度传感器故障
- 空气过滤器脏污
- 质量空气流量传感器故障
- 进气温度传感器接线或连接故障或腐蚀
常见误诊
- 进气温度传感器被更换，而真正原因是空气过滤器脏污
- 当真正原因是连接不良或接线皴裂时，更换进气温度传感器。
- 当真正的问题出在质量空气流量传感器上时，进气温度传感器被更换。
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。
P0114 车间和技术人员诊断理论
在诊断 P0114 代码时，重要的是记录冻结帧信息，然后在试车时重复代码设置条件，同时密切注意数据流扫描工具上的发动机负荷、节气门位置、转速和路速。 在驾驶车辆时，将这些值与进气温度传感器 PID 或参数 ID 进行比较。 进气温度传感器电压值应随着发动机温度的变化而升高和降低。 将进气温度或IAT读数与冷却液温度传感器读数进行比较，因为它们应相互同步移动。 但是，发动机冷却液温度传感器的温度范围要高得多。
在钥匙打开而发动机关闭的情况下检查IAT传感器连接器。 需要有稳定的5伏参考电压和非常好的接地。 查找并使用正确的发动机性能接线图来辨别连接器中这些导线的正确颜色和位置。
对IAT传感器进行钥匙接通发动机熄火电压输出测试永远不会有坏处。 通常，我会小心地使用热风枪提高传感器周围区域的温度，并研究进气温度值的变化。 使用扫描工具数据流很重要，因为这将验证IAT线束和连接。
Ronald Thomas
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