How to detect the throttle position sensor?

It can be measured with an oscilloscope.

Connect the BNC- banana head cable to the first channel of the oscilloscope. The red banana head is connected to the signal output end of the sensor with a needle, and the black banana head is connected to the ground with a crocodile clip. Oscilloscope channel attenuation ratio is set to 1X, vertical gear is set to 500mV, and time base can be set to1s. In order to prevent burr interference, low-pass filtering can be turned on, and some oscilloscopes also support one-button setting.

Turn on the ignition switch, the engine is not running, slowly let the throttle from the closed position to the fully open position, and then return to the throttle closed position again. Repeat this process several times slowly.

Some vehicles have two throttle position sensors. One for engine control and the other for transmission control. The signal from the engine throttle position sensor corresponds to the operation of the transmission throttle position sensor. The signals of the two throttle position sensors are opposite and check each other. We call this design pattern "redundant" design.