To stabilize a TPS signal that may be picking up noise from the bike’s electrical system, or aftermarket electrical components such as plug wires, exotic high end racing style coils or gapless spark plugs etc. we can reroute what we call the digital ground wire from the main ground location directly to the ground at the TPS sensor itself, which provides a shorter ground path and less chance of picking up the noise that may be causing the jumping TPS reading problem. Rerouting the wire in this manner often stabilizes the TPS from fluctuating.
On units that have a single gray TPS wire on the Power commander rather than in line TPS male/female connectors we accomplish this by disconnecting the main ground wire with the eyelet on it from the battery negative terminal or wherever it is currently grounded. Once the ground wire is disconnected you will be able to pull back the wire sheathing to reveal two separate wires. One is a larger black wire and one a smaller black w/white tracer. The smaller black with white tracer wire is what is used for a digital ground for the secondary signals. Once you have the two wires exposed you can clip the black & white wire at the eyelet, then follow the sheathing down its length to where it joins the main harness and pull the wire out from the sheathing at that point if possible or make a small slit to allow you to pull the black & white wire loose from the sheathing. Once this is done the wire should now be a separate single wire, that you can now route individually and attach it directly to the ground wire on the bikes TPS connector via a positap or 3M scotch lock wire connector or some similar method of connecting the two wires together to make good contact. Most bikes have a three wire TPS sensor connector that attaches to the TPS sensor itself. One wire supplies the 5 volts necessary to power the sensor, one wire is the variable voltage (0-5 volts) that indicates throttle position (this wire is the one the Power commander gray wire is connected to) and the third wire is the TPS ground and this is the wire the rerouted black and white wire would be connected to. You would have to refer to your particular bikes wiring diagram for the color scheme. Once you have rerouted the black and white wire in the above manner you would reconnect the main ground wire with the eyelet to its original location. If the black & white wire turns out to be too short to reach the TPS connector you would have to lengthen it to be able to reach the connector with an additional length of jumper wire.
Once you have rerouted the digital ground wire and reconnected the main ground wire to its original location you are ready to start the bike, and should have a constant stable TPS reading that only moves when you twist the throttle.