A vehicle comprising: an engine; a throttle body including a passage section formed with an air-intake passage through which air to be supplied to the engine flows, and a throttle valve provided in the air-intake passage; and a throttle valve controller which controls opening or closing of the throttle valve, wherein the throttle valve controller includes: a memory section which contains therein a medium output control command which has been pre-stored before completion of the manufacturing of the vehicle and which is stored in the memory section in such a manner that the medium output control command continues to be stored in the memory section in a state in which electric power supply to the throttle valve controller is ceased, the medium output control command indicating a medium output opening degree of the throttle valve, corresponding to a preset medium output included in a range between a minimum output and a maximum output of an engine output, the medium output opening degree corresponding to a predetermined upper limit value which an engine output is controlled to become when the engine output meets a predetermined output limiting condition while the vehicle is traveling, and a learning section which performs a learning operation for learning a fully closed position and a fully open position of the throttle valve at which a motion of the throttle valve is physically inhibited, wherein, when the engine output meets the output limiting condition, the throttle valve controller controls opening and closing of the throttle valve in accordance with the medium output control command read from the memory section such that the engine output is controlled to become the medium output, and wherein, when the engine output does not meet the output limiting condition, the throttle valve controller controls opening and closing of the throttle valve in accordance with a control command based on a learning value obtained by the learning section. an engine; a throttle body including a passage section formed with an air-intake passage through which air to be supplied to the engine flows, and a throttle valve provided in the air-intake passage; and a throttle valve controller which controls opening or closing of the throttle valve, wherein the throttle valve controller includes: a memory section which contains therein a medium output control command which has been pre-stored before completion of the manufacturing of the vehicle and which is stored in the memory section in such a manner that the medium output control command continues to be stored in the memory section in a state in which electric power supply to the throttle valve controller is ceased, the medium output control command indicating a medium output opening degree of the throttle valve, corresponding to a preset medium output included in a range between a minimum output and a maximum output of an engine output, the medium output opening degree corresponding to a predetermined upper limit value which an engine output is controlled to become when the engine output meets a predetermined output limiting condition while the vehicle is traveling, and a learning section which performs a learning operation for learning a fully closed position and a fully open position of the throttle valve at which a motion of the throttle valve is physically inhibited, wherein, when the engine output meets the output limiting condition, the throttle valve controller controls opening and closing of the throttle valve in accordance with the medium output control command read from the memory section such that the engine output is controlled to become the medium output, and wherein, when the engine output does not meet the output limiting condition, the throttle valve controller controls opening and closing of the throttle valve in accordance with a control command based on a learning value obtained by the learning section. a memory section which contains therein a medium output control command which has been pre-stored before completion of the manufacturing of the vehicle and which is stored in the memory section in such a manner that the medium output control command continues to be stored in the memory section in a state in which electric power supply to the throttle valve controller is ceased, the medium output control command indicating a medium output opening degree of the throttle valve, corresponding to a preset medium output included in a range between a minimum output and a maximum output of an engine output, the medium output opening degree corresponding to a predetermined upper limit value which an engine output is controlled to become when the engine output meets a predetermined output limiting condition while the vehicle is traveling, and a learning section which performs a learning operation for learning a fully closed position and a fully open position of the throttle valve at which a motion of the throttle valve is physically inhibited, wherein, when the engine output meets the output limiting condition, the throttle valve controller controls opening and closing of the throttle valve in accordance with the medium output control command read from the memory section such that the engine output is controlled to become the medium output, and wherein, when the engine output does not meet the output limiting condition, the throttle valve controller controls opening and closing of the throttle valve in accordance with a control command based on a learning value obtained by the learning section.