故障现象一辆标致307轿车,发动机达到正常温度后松开加速踏板易熄火。故障诊断接车后首先验证故障现象。在将该车开进维修车间的过程中,发动机出现了2次熄火,但是原地松加速踏板试验,却没有出现发动机熄火的现象。接着连接故障检测仪检查,发动机系统没有故障代码储存。读取发动机数据流,也没发现异常数据。初步分析导致故障的可能原因,有:怠速步进电动机异常;进气系统或进气歧管绝对压力(MAP) Symptom A Peugeot 307 sedan, the engine reaches normal temperature after the release of the accelerator pedal to turn off. Troubleshooting After the first car to verify the fault phenomenon. In the car into the maintenance process, the engine appeared two flameout, but the original pine acceleration pedal test, but did not appear the engine flameout phenomenon. Then connect the fault detector check, the engine system is no fault code stored. Read the engine data stream, did not find abnormal data. Preliminary analysis of the possible causes of failure are: idling stepper motor abnormalities; intake system or intake manifold absolute pressure (MAP)