A. When diesel engine goes wrong, please eliminate faults by following the principle of from the easy to the difficult one by one. B. Before the problem is not clear, please do not easily replace any accessory. C. Before the problem is not clear, please do not easily eliminate flash codes. Please pay attention to record flash codes! D. Fault elimination steps: (1). Read flash codes according to flash code lamp to confirm fault points. If fault points cannot be confirmed, please continue to the next step. There are two ways to read flash codes: Read flash codes through fault diagnostic instrument; Or read flash codes through flash codes of diesel engine flash code lamp Flash code lamp read: Flash code lamp reports a flash code for each pulse signal given by diagnostic switch; when diagnostic switch is ON all the time, the flash code lamp is normally ON! ECU error memory can store 10 errors at most; the flash code lamp is ON and OFF 0.5s1s Each flash code consists of three levels and the interval between two levels is 1s. For example: 321 Method of eliminating flash code manually: Before T15 is ON, please press down (switch on) fault diagnostic switch and then switch on key switch (T15 is ON). (2). Release the diagnostic switch after 4-8 seconds. If a flash code cannot be eliminated, than it is the current fault. If hardware fault shall be eliminated firstly and then ECU fault memory shall be eliminated. If flash code cannot be eliminated, please inform of specialized persons for treatment as soon as possible.