P0325 OBD-II：爆震传感器1电路 OBD-II故障代码P0325是什么意思？
OBD-II代码P0325定义为爆震传感器＃1 - 电路故障（单传感器或1组）
爆震传感器的作用是提醒动力总成控制模块（PCM）发动机出现 "呯呯 "或 "咚咚 "声，这一点非常重要，因为 "呯呯 "或 "咚咚 "声会产生有毒的氮氧化物气体污染空气，导致酸雨和哮喘等呼吸道疾病。
代码P0325表示来自1号爆震传感器电路的读数过低、过高、不稳定或以某种方式超出其工作窗口和故障。
See_also: P0480 OBDII故障代码 P0325症状
- 发动机检查指示灯点亮
- 加速时发动机跳动
- 发动机运转温度可能高于正常温度
- 在极少数情况下，发动机可能不会表现出明显的症状
触发P0325代码的常见问题
- 爆震传感器故障
- 爆震传感器电路或连接故障
- EGR系统故障
- 冷却系统故障
- 低空气/燃油比
常见误诊
- 当代码P0325的原因是冷却系统问题时，更换了爆震传感器
- 当代码P0325的原因是EGR系统故障时，更换了爆震传感器
想了解更多信息？
See_also: P0356 OBD II故障代码 动力总成控制模块（PCM）控制点火系统火花提前量，以获得最大功率和燃油经济性。 当爆震传感器向动力总成控制模块（PCM）发出发动机 "呯呯 "声或爆震信号时，PCM所做的第一件事就是改变正时提前量，以可控增量延缓正时提前量，直到爆震传感器停止发出信号。PCM 发现发动机 "乓 "响。
P0325 车间和技术人员诊断理论
代码 P0325 的触发是因为 PCM 知道来自 1 号爆震传感器电路的信号超出了其正常工作窗口、出现故障和/或发动机出现异常状况。 捕捉并记录冻结帧数据，以便了解当 PCM 触发 P0325 代码时出现了哪些工作条件。 然后对发动机进行目视检查，并将检查结果记录下来。然后起动发动机，试转几圈，看其运转是否正常，确保没有严重的机械故障，以免车辆在行驶过程中造成进一步的损坏。 用数据流扫描仪试车，并密切注意车辆的运转情况。注意1号爆震传感器PID和正时提前量PID。 1号爆震传感器电路工作情况如何？ 当发动机 "呯 "或 "呯 "不响时，它是否发送或不发送信号？ 如果是，找出原因。 有时，我把车开回维修车间，用小锤子敲发动机，观察爆震传感器PID和正时提前量PID。
Ronald Thomas
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