论文部分内容阅读
故障现象:2011款科鲁兹1.8发动机故障灯常亮。故障诊断:该事故车修好以后试车,发现发动机故障灯常亮,用GDS2检查,发动机故障代码为P0172(燃油调整系统高电压,即混合气浓),查看数据流发现长期燃油调整为-25%(正常为±5%以内)。导致混合气偏浓的原因大概有两种:多喷油;少供气。仔细询问修理工得知,该车事故时只碰坏了空气滤清器壳体,并且发动机吊装过,其他没动过。检查空气滤清器及相关部件,未发现堵塞,由此可排除第二个原因。那么是什么原因导致多喷油呢?根据电喷发动机工作原理,空气流量传感器是ECM喷油的主控参数,于是决定先从空气流量传感器入手。查看相关数据流,该车怠速时测量空气流量值大
Symptom: 2011 Section Cruze 1.8 engine fault light is always on. Troubleshooting: After the accident repaired the car and found that the engine fault light is always on, with GDS2 check, the engine fault code P0172 (fuel adjustment system high voltage, that is, the mixture of thick), view the data flow found long-term fuel adjusted to -25% (Normal is within ± 5%). There are probably two reasons why the mixture is thick: more fuel and less gas. Carefully asked the mechanic that the car accident only broke the air filter housing, and the engine hoisted, the other did not move. Check the air cleaner and related parts, no blockage, which can rule out the second reason. So what is the reason for more fuel injection? According to EFI engine working principle, air flow sensor ECM fuel injection is the main control parameters, so decided to start with the air flow sensor. View related data stream, the car idle speed measurement of air flow value