What if the throttle signal is small?

There is a throttle position sensor opposite the throttle cable. Unplug the plug and measure with a multimeter. What kind of throttle are you, direct-acting or electronic? If it works directly. The multimeter is within the range of 20V, and the probes are connected to terminals 5 and 7 or 8 and 7. Start the engine and check the following values. The multimeter display generally changes at 05V.