故障现象一辆2009年产金杯车,行驶里程约为9.7万km,因停车后发动机无法起动着机而被拖至修理厂检修。故障诊断接车后,首先检查发动机外观,没有发现任何异常。接着验证故障现象,尝试起动发动机,起动机运转正常,发动机转速也正常,但就是没有着机的征兆。分析可知,正常运行的发动机在熄火后突然出现无法起动的故障现象,其原因可能有:曲轴位置传感器或凸轮轴位置传感器损 Symptom A 2009 Gold Cup car, mileage of about 97,000 km, after stopping the engine because the engine can not be started and was towed to the repair shop maintenance. After troubleshooting the car, first check the appearance of the engine, did not find any abnormalities. Then verify the symptoms, try to start the engine, the starter is running properly, the engine speed is normal, but there is no sign of a chance. Analysis shows that the normal operation of the engine after the sudden failure can not start the phenomenon of failure, the reasons may be: crankshaft position sensor or camshaft position sensor damage