It's the black plastic thing on the drivers side of the throttle body and has wires coming out the back of it. You can test it , but you need an ohmeter:
Measure the resistance between the middle terminal and one of the outer two, then middle terminal and the other one.Should be in the 400 to 600 ohms range and should change smoothly as you fully open & close the throttle. Any difference in resistance or weird changes as you open/close throttle time to change the sensor. Have fun getting your probes in- space is tight.
Replacement is fairly simple. Disconect the electrical connector, undo the two screws and install new one tightening to 27 in/lbs (not very tight if you don't have a torque wrench- even though every body should!) Don't forget to plug the wires back in!
(Technical source - Haynes Repair Manual, Contour/Mystique '95-'98)
David BC
White '96 Mystique GS
White '88 Cherokee Ltd
