How to work with Touch in Unity?

Question

Unity

I'm trying to make the car go using the Touch phase. But it doesn't work. Although when using the computer buttons, all functions work. What's my mistake?

private void Update()
    {
        if (Input.touchCount > 0)
        {
            float  _pos;
            float _startPos = 0f;

            Touch _touch = Input.GetTouch(0);

            if (_touch.phase == TouchPhase.Began)
            {
                
                _startPos = _touch.position.x;
                Debug.Log(string.Format("_startPos = {0}", _startPos));
            }
            else if (_touch.phase == TouchPhase.Moved)
            {
                inputX = 1;
                inputY = 1;

                Move();
                Turn();
                AnimatWheels();
                Debug.Log(string.Format("InputX = {0}, InputY = {1}", inputX, inputY));

            }
            else if (_touch.phase == TouchPhase.Ended)
            {
                Debug.Log("Ended");
            }
        }