The maintenance technicians used a diagnostic instrument to read the ECU data and found that the signal sent by the ECU to the 0R-3002 injectors was unstable, sometimes interrupted, leading to abnormal injection of the injectors. The root cause of the signal failure was that the ECU sensor was faulty, and the sensor could not accurately collect the engine operating data, resulting in incorrect signal output. In addition, the wiring between the ECU and the injectors was loose, which also affected the signal transmission.