TPS - comparing old & new unit's output voltage signals

Throttle position sensors are one of the common causes of surging, stalling and poor engine running. They are susceptible to water ingress which causes corrosion which in turn effects the resistance of the sensor at certain angular positions. This in turn effects the output voltage signal sent to the ECU.
As a result the ECU 'thinks' that the actual position of the throttle valve is more or less than it really is (usually more), it then basis its fueling calculations on the 'wrong' throttle position ultimately leading to excessive (or insufficient sometimes) fueling.
Knowing the correct way how to testing a TPS is very important, checking throttle closed output voltage, throttle wide open voltage and the progressive change in voltage as the throttle is opened and closed slowly.
Any minor 'glitch' in the voltage output, be it a spike (higher) or dip (lower) voltage can indicate a problem with the internal track.
If any of these specifications are suspect then the unit must be replaced. This video is a continuation of video #1203 - How to test a Throttle Position Sensor. In this one I'm checking the output signal of the new part to ensure it's within Manufacturer's specifications & how it compares to the old 'faulty' unit. I also explain how the ECU's operation is affected by receiving the wrong signal from the faulty unit.
If you have any questions or comments please leave them in the comments section below...
Andy Mechanic!

[@benrodeheaver701]

This is really something. Good idea to show the faults in the old one. Thanks.

[@danankblast]

Helo, ive question is butterfly/throttle coin is fully sealed close or any gap for it? thanks sir,