B 12 throttle position sensor voltage

According to different working conditions, the opening is also different. The signal voltage output by the electronic throttle is between 0.5 and 4.5V, and the voltage less than 0.5V and greater than 4.5V is used to identify the short circuit and open circuit of the line. How do you know that the fuel consumption has increased just after washing the throttle? It must be the throttle.