一辆一汽大众开迪车,出现发动机无法起动的故障。检查分析检查发现,接通点火开关后,汽油泵发出“咚咚咚”响声。但不能建立起油压,同时167号燃油泵继电器也发出“嗒嗒嗒”响声。怀疑是燃油泵继电器不能正常吸合导致燃油泵发出响声并且不工作,但换上新的继电器后故障现象仍旧存在,说明问题不在继电器。根据电路图分析,发动机电控单元控制燃油泵继电 A Volkswagen Di Di car, the engine failed to start the fault. Inspection and analysis checks found that after the ignition switch is turned on, the gasoline pump emits a “boom” sound. But can not establish the hydraulic pressure, at the same time 167 fuel pump relay also issued “da da da” sound. It is suspected that the fuel pump relay can not be normally closed causing the fuel pump to sound and does not work, but after the replacement of the new relay fault phenomenon still exists, indicating that the problem is not in the relay. According to the circuit diagram analysis, the engine ECU controls the fuel pump relay