本装置采用PLC控制回路，具有故障码显示功能，使维修更加方便。
This machine adopts PLC control loop and can display failure codes, facilitating the maintenance.
结合故障实例进行分析，针对无故障码显示的线路断路和接触不良故障，提出了检测方法和维修方法。
Analyzing through the trouble example, and put forward the method of inspection and maintenance according to the trouble of broken circuit and improper contact of circuit of no-trouble code display.
同样地，有时，有些故障可能在系统中已经产生但并没有“检查发动机”灯或故障码信号显示。
Similarly, at times, some problems may occur in the system even when there has been no check engine light or trouble code signal.
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