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To debug automatic mechanical transmission (AMT) more quickly and accurately, an AMT-fault-diagnosis device is designed based on the ISO 15765 protocol, which adopts the flow control mechanism and has off-line diagnostics function. Requirements for the device are analyzed and diagnostic trouble code (DTC) is defined. Electrically controlled hardware with graphics display function and fault diagnostic software flowchart are designed based on the electronic control hydraulic AMT system. Bench and vehicle driving tests showethat the AMT-fault-diagnosis device can read and delete the fault message successfully with a stable performance.