You are right in thinking it is a potentiometer. You can reset them very simply, because the values of tickover and flatout are already programmed in the ECU you can re-learn the ECU to read the TPS by ,
1. Turn on ignition.
2. Press throttle pedal fully down and up quite quickly about 10 times should do it.
3. Turn ignition off and wait a few minutes, or finish your tea!
4. Start engine.
The number of times you press the pedal varies with different cars, some more some less, but I find 10 is about enough. At resting position with the ign on the TPS should read 0.4-0.5 volts or thereabouts, if it reads 0 volts it is dead.
Phil
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