Automatic Mode <A>
Automatic Mode is the default operating mode of the transmission. In this mode, the transmission intelligently selects gears based on real-time data, including throttle opening, engine speed, vehicle speed, current gear, and driving conditions.
The system also supports manual intervention. Drivers may override automatic shifting as needed, but the transmission will first validate the rationality of the manual request. If the request is deemed inappropriate (e.g., shifting at an excessively low speed), the transmission will reject the command.
Manual Mode <M>
Manual Mode is recommended for complex driving conditions to provide the driver with full operational control. In this mode, gear shifting decisions are made entirely by the driver.
When a gear change is required, the driver sends a shift request via the gear selector. The transmission will execute the requested gear change immediately. If no shift request is made, the transmission will maintain the current gear and will not upshift automatically.
Note:
After receiving a shift request, the system will verify its rationality. If the request is invalid, the transmission will not execute the shift.
Economy Mode <E>
In Economy Mode, the transmission optimizes shift points to keep the engine operating within its most fuel-efficient speed range. This strategy minimizes fuel consumption and improves the overall operational economy of the vehicle.
Power Mode <P>
In Power Mode, the transmission prioritizes performance by adjusting shift logic to maximize engine power output. This mode enhances the vehicle’s acceleration performance and climbing capability.
Attention:
For driving on long, steep grades (such as snow-covered slopes) or low-traction road surfaces, it is strongly recommended that the driver activate Power Mode <p>.
Creep Mode <Dm> / <Rm>
Creep Mode is designed for short-distance maneuvering or moving the vehicle at an extremely slow speed. It is divided into Forward Creep Mode <Dm> and Reverse Creep Mode <Rm>. Once activated, the vehicle will move slowly (creep) when the accelerator pedal is lightly pressed.
Caution:
Creep Mode can only be activated when the vehicle is stationary. After activation, the transmission will automatically engage 1st gear (for forward) or Reverse gear (for reverse).
Hill Start Assist
The Hill Start Assist function prevents the vehicle from rolling backward when starting on an incline.
When the vehicle is equipped with an ABS or ESC system that supports this function, the driver can activate Hill Start Assist via a dedicated button on the dashboard. This prevents the vehicle from rolling back after the driver releases the brake pedal.
Fault Diagnosis
The AMT system is equipped with a comprehensive self-diagnosis function. In the event of a transmission-related fault, the Transmission Control Unit (TCU) will send fault codes and detailed diagnostic information via the CAN bus. For vehicles equipped with a display screen, the instrument cluster will show the fault code and its corresponding description. For vehicles without a display screen, the instrument cluster will only illuminate the malfunction indicator light (MIL). Technicians can refer to the AMT Fault Code Manual for Medium and Light-Duty Trucks to retrieve detailed fault information and perform targeted repairs.
Instrument Display
The AMT system provides real-time status feedback to the instrument cluster. After the vehicle is powered on, the TCU continuously transmits data—including the current operating mode, current gear, and target gear—to the CAN bus. The instrument cluster parses this CAN bus data to display critical information such as the current driving gear and operating mode to the driver.
Engine Overspeed Protection
The AMT system features an Engine Overspeed Protection mechanism, active in both Automatic and Manual Modes. If the engine speed exceeds the safe threshold, the transmission will automatically disengage the clutch to prevent severe engine damage.
