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To verify the hardware and software performance of a common rail turbocharged diesel engine ECU, a simulator was built up based on dSPACE hardware boards. The interface between the simulator and the ECU was developed. The real-time simulation model of the common rail turbocharged diesel engine was setup up in enDyna and successfully downloaded to the simulator. The monitor interface was designed in ControlDesk environment. The ECU hardware performance verification and failure mode test were conduct. The software integration verification was also carried out. The results indicate that the ECU could operate very well under various working conditions.