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The ABS ECU indoor performance testing bench was developed to test the ECU fault diagnosis and control functions. The test bench consisted of the reoccurrence equipment of wheel speed signals, the measuring and controlling system, the data collection system, the basic brake system and the constant-pressure hydraulic power. The test result shows that the bench can satisfy the requirement of testing the ECU control. It was easy to set the faults of sensors, and easy to test the ECU diagnosis function for the test bench.