故障现象一辆2006年产的上海别克君威2.0L轿车,搭载L34发动机和5挡手动变速器,在一次事故维修后出现发动机无法起动的故障。故障诊断起动发动机,起动机不转。用万用表测量蓄电池电压,为12.6 V,正常;接通前照灯开关和喇叭开关,灯光正常,喇叭响亮,由此排除蓄电池故障。连接故障检测仪,进入发动机控制模块(ECM),无故障代码显示;进入防盗系统,也无故障代码显示。再次起动发动机,并观察 Fault phenomenon A 2006 Shanghai Buick Regal 2.0L sedan equipped with L34 engine and 5-speed manual transmission, the engine fails to start after an accident repair failure. Troubleshooting start the engine, the starter does not turn. With a multimeter to measure the battery voltage, 12.6 V, normal; turn on the front light switch and horn switch, the light is normal, horn loud, thus ruining the battery failure. Connect the fault detector, into the engine control module (ECM), fault-free code display; into the anti-theft system, there is no fault code display. Start the engine again and observe