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故障现象一辆2009年产荣威750车,搭载1.8T发动机,累计行驶里程约为23.8万km。车主反映,该车发动机无法起动。故障诊断接车后试车,尝试起动发动机,起动机运转正常,但发动机无着机迹象。用故障检测仪检测,无故障代码存储。检查火花塞,不跳火;使用二极管试灯测量喷油器控制信号,试灯不工作;测量点火线圈和喷油器的供电,均正常。诊断至此,推断发动机控制单元未向点火线圈和喷油器提供点火和喷油信号,可能的故障原因有:曲轴位
Failure phenomenon A 2009 production Roewe 750 car, equipped with 1.8T engine, accumulated mileage of about 238,000 km. Owners reflect the car engine can not start. Troubleshooting After taking the car to test the car, try to start the engine, the starter is operating normally, but the engine has no chance of landing. Detected with fault detector, fault-free code storage. Check the spark plug, do not jump fire; use diode test light injector control signal, the test light does not work; measure the ignition coil and injector power supply are normal. At this point of diagnosis, it is inferred that the engine control unit did not provide ignition and injection signals to the ignition coil and injector. Possible causes of the malfunction are: