The CAT4000 implements the detection of the Carter electronic control system. The functions include medium voltage common rail pump test, 320d pump test, and HEUI pump test. The system provides pressure control, flow signal detection, Carter electronic control system control signals, and drives the oil pump and injector to work. The driving signals and parameters can be set according to their actual conditions, and can be saved in groups, which is convenient for maintenance personnel to judge and repair the working status of the Carter electronic control system.