What is the purpose of the TPS? - Kawasaki Versys Forum
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post #1 of 4 (permalink) Old 01-29-2009, 06:00 PM Thread Starter
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What is the purpose of the TPS?

I'm interested if anyone has info on what the TPS does to the engine mapping?

The reason is that to my thinking, the fueling is controlled by the Manifold Air Pressure Sensor, and the Air Intake Temperature Sensor.

I would understand a Throttle Position used for sensing idle and WOT, and possibly rate of throttle application, but not to set the fueling itself. Maybe used to richen mixture when being rapidly applied, or large scale change to reduce knocking? Maybe the ECU has a "lean burn" mode for cruise and switches to that if the TPS is stable for a while (some cars do this).

I would also bet the MAP sensor is relative, not absolute, therefore would not adjust for altitude unsless combined in closed loop with an oxygen sensor.

Obviously from the adjustments effects, it has an effect, but I'm confused as to what.

Any thoughts?

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post #2 of 4 (permalink) Old 01-29-2009, 06:26 PM
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Don't forget you have ignition timing to account for. That's what the TPS deals with.
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post #3 of 4 (permalink) Old 01-29-2009, 07:53 PM
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it seems like it's kind of a PITA to check the tps voltage when running. too back you can't check resistance with an ohm meter at closed/open positions....or can you???
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post #4 of 4 (permalink) Old 01-30-2009, 05:24 AM
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You can check TPS resistance, but there are only voltage specs given to check setting... Perhaps it could be calculated or checked on a properly set TPS.
The TPS does add fuel and advance ignition timing when opening throttle at low to mid speeds/rpms. I had found my TPS to be set a bit below spec. Adjusting it improved driveability a lot.

Last edited by invader; 01-30-2009 at 06:00 AM.
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