| Author | Message | ||
     Willmrx |
What are the causes for having to reset the TPS? Does the data in the ECM get corrupted, or is the sensor inconsistent? (Message edited by willmrx on August 06, 2016) (Message edited by willmrx on August 06, 2016) | ||
| Stevel |
The purpose of a TPS reset is that the relationship between ingested air mass and the feedback resistance of the variable resistor (TPS) can change for a multitude of reasons, not necessarily because of data corruption. Automobiles also use mass air sensors. These are not used on motorcycles because of physical space limitations. On many ECMs, TPS reset is automatic at power up time, but not on the Buells. | ||
| Terrys1980 |
There is only usually two situations you would need to reset it and that is ECM or TPS replacement; other than that it should not change. | ||
| Reepicheep |
The TPS is just a potentiometer, which is the same thing the old volume knob was on an old style stereo. It is generally a metal wiper that goes across some kind of metal carbon film deposted on a flat surface. The more of the film the current has to go through between the wiper position and the other fixed connection to the film, the more ohms of resistance there is. So as you wipe away from the other terminal, resistance goes up. These things are remarkably durable over time for what is basically a mechanical system, but the film gets dirty, and the wiper gets dirty, and resistance can change with temperature and probably moisture, so from time to time you need to tell the ECM which "ohm reading" is the right one for the throttle being completely closed. | ||
| Dannybuell |
Reepicheep ~ excellent explanation. | ||
| Terrys1980 |
If your concern is resistance varying over time then the resistance varies that much during a ride due to voltage changes. The TPS sensor doesn't see a constant voltage input. | ||
| Stevel |
Terry, Just for your information, the ECU power is internally voltage regulated and that regulated voltage is what is fed to the TPS, not raw battery voltage. | ||
| Willmrx |
Thanks for all of the info! |
