（1）电源电路故障 　　其故障的原因是调节器脏污、Damp，Cause the charging voltage to be too high；Power polarity is reversed；Turn on the starter while charging；The engine is running，The battery connector is loose, causing the generator to directly supply power to the ECU；Oil stains during work、water、Dust causes leakage of power line connections, grounding, etc.。 　　（2）输入/输出电路故障 　　常见的故障是放大电路元件烧坏，Sometimes it is also accompanied by the burning of the steel line on the circuit board, etc.。This type of fault is very easy to occur when construction machinery is working for a long time with heavy load.、Poor engine cooling、Surface paint and welding repair work、Conditions such as overcurrent and overvoltage in the circuit。 The mechanism has two aspects： One is that the temperature is too high, which causes damage to the material and insulation of the parts.； The second is the ablation of components caused by overcurrent and overvoltage。So the working temperature of ECU cannot exceed 85℃，Pay attention to heat dissipation and cooling when working at higher temperatures,The engine can only be started after the temperature is normal，And do not cut off any connection lines of the ECU during operation。 　　（3）存储器故障 　　常用的存储器有4种，For erasable programmable memory (EPROM or EEPROM) failure，Can be processed by copying。A few ECUs are encrypted，The chip cannot be copied。 [...]