TPS input problem

[SPatrickB]

My 3.6 has developed a TPS input problem. When I start the ECU, the TPS ADC counts rise from 0 to about 190 over a period of a minute or so. This happens with or without any sensor attached.
The increment is not linear, i.e. it starts fast and gets slower in what appears to be exponential rate.

Any ideas what could cause this?

[Sprocket]

As you have already found, with the TPS disconnected, the reading rises on its own. This is expected.

Knowing that, you can now see that with the TPS connected, if you experience the same, there is likely a problem with the wiring to the sensor, or the sensor is faulty in its own right.

Other than that, there is the slim posibility the input on your box may be faulty, but I think that would be exceptional.

Check at the TPS connector, the ground is good, there is volts between the ground and 5v. if those are good, check the resistance of the sensor its self changes with hrottle movement.