Fixing the controller in an electric scooter takes some troubleshooting and inspecting. First, make sure that all connections are fully seated and functioning properly, the battery is fully charged, and the scooter is powered on when testing different components. Inspect the entire body, especially any exposed electrical components, for damage, fraying or wear. If the scooter does not respond when you pull on the throttle and the LCD does not display any error messages.
Electric scooters have square wave controllers or sine wave controllers, which results in different acceleration patterns. In very basic terms, square wave controllers apply power in pushes or an on/off motion, like flipping a lightswitch. Sine wave controllers apply power in a more continuous, smooth motion, resulting in a smoother acceleration pattern, like a light dimmer dial. Most electric scooters have square wave controllers but sine waves are being used by more scooter manufacturers.
To remove speed limiter features on an electric scooter, refer to the guide for your LCD display and the scooter’s performance settings (p-settings). Many electric scooters have Eco/Turbo and Single/Dual modes. Some also have riding modes that limit the scooter’s top speed. When you are in Eco mode, the scooter’s settings are configured to limit speed in exchange for longer battery life.