P0100 OBD-II：质量或容积空气流量 "A "电路 OBD-II故障代码P0100是什么意思？
OBD-II代码P0100被定义为质量空气流量电路故障。
质量空气流量传感器（MAF）测量进入发动机的空气量。 这是发动机控制模块（ECM）计算适当的燃油量和点火正时所需的重要信息。 当ECM检测到ECM和MAF传感器之间的电路出现问题时，就会设置P0100故障代码。 当这一关键部件的数据输出出现问题时，就会设置代码P0100。传感器变得不稳定或消失。
See_also: P2682 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
P0100 症状
- 发动机检查指示灯点亮
- 发动机运转不良
- 车辆在加速时可能熄火和/或迟滞
- 燃油效率低
- 在某些情况下，可能未发现异常症状
触发P0100代码的常见问题
- MAF传感器插头拔出或线路损坏
- MAF传感器电路中的电气端子松动或腐蚀
- MAF传感器故障
常见误诊
- 当代码P0100的原因是连接器和/或线束缺陷时，更换MAF传感器
- 当代码P0100的原因是真空泄漏时，更换MAF传感器
- 当代码P0100的原因是发动机点火不正常时，更换MAF传感器
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P0100诊断理论
在诊断 P0100 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。 将这些值与每秒空气质量流量克数 PID 进行比较。 如果每秒空气质量流量克数变化很大或与转速和节气门位置的移动方向相反、那么您可能已经验证了P0100代码的设置条件。
See_also: P0366 OBD II故障代码 对任何质量空气流量传感器都有一个非常有效的 "真相测试"。 启动发动机，让其怠速运转，然后检查扫描工具数据上的气压读数。 如果读数为26.5汞柱，而您接近海平面，您就知道您的空气流量计有问题，因为它告诉您，您在大约4500英尺的高度。 以上 这些换算表将有所帮助。）当质量空气流量传感器看到气压读数时，它会调整其空气密度表，然后 "少报 "进入发动机的实际空气量。 它这样做是因为气压传感器实际上是质量空气流量传感器的一部分。
有时，空气流量传感器和传感线被污垢、灰尘或油残留物覆盖，这可能会在P0100代码之外设置P0171。 清洁传感器可能会暂时解决问题，但MAF传感器应予以更换。 这是因为清洁传感线并不是一个足够彻底的解决方案。污染会嵌入传感线的凹槽和缝隙中。 始终确保空气滤清器及其外壳无污垢、灰尘和油污。 如果根据需要清洁和更换滤清器及其外壳，则可防止新的MAF发生故障。
Ronald Thomas
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