Throttle Position Sensors - The job of a TPS is to convert the throttle blade angle and throttle opening speed to an electrical signal that is sent to the PCM. The PCM then uses the electrical signal to determine engine load and adjust ignition timing.
Throttle position sensors on Jeep Wrangler YJ's are simple little sensors to test and replace if needed. Here I finally got around to changing the TPS. Here I give you step by step instructions of how to change the TPS and a quick test to make sure all is working correctly.
are TPS Sensors located?
Bolted to the side of the throttle body. Look where the throttle cable is connected to the throttle body. At the opposite end of that shaft is the TPS.
Will it trigger the check engine light if the sensor is faulty?
It may. I’ve seen cases where it didn’t. Jeep would just idle erratically or idle high. Or, possible dead spot as the throttle is opened. Run the DTC to see if it’s hiding the code and not illuminating the “Check Engine Light”. Or refer below or this video to test the sensor to determine if it’s faulty.
Why does it fail?
Heat and vibration from being under the hood can eventually take its toll on the busy little sensor. Or, maybe it's because of fast heavy right foot actions :-).
How do you test Throttle position sensors to see if they are bad?
To start out with you will need a simple tool called a multi-meter and a small paper clip.