How to find the signal line of automobile throttle position sensor? It is urgent.

There is a throttle position sensor opposite the throttle cable. Unplug the plug and measure with a multimeter. What kind of throttle do you have, direct-acting or electronic? If it is a direct-acting type. Turn the multimeter to the 20V range, connect the probe to the terminals of 5 and 7 or 8 and 7, start the engine, and see the value displayed by the multimeter: generally it varies between 0 and 0~5V.