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Because of the drive by wire nature of my car, I was wondering if the reported thottle possition is the commanded TP or reported TP. In other words, if I see 20% TP, is his what is commanded by the peddle or is this a reading from a sensor in the throttle body?
well.. its commanded by the peddle in some shape or form..
however.. which is in turn based off the tps sensor.. and that sensor is also verified by that strange test.. that does two air mass calcs that puts FI cars into reduced paower mode..
so..
commanded by peddle
articulated based on tps sensor
tps is verified by random annoying error code thing
thats my best guess anyway..
I haven't looked at this on HP Tuner yet, but there are several different readbacks for throttle position on Ease (scanner). There is a requested throttle, commanded throttle, and actual throttle position, and a couple of others.
With our fly by wire, it would be possible for the commanded throttle and the actual throttle to be different if the throttle body was limiting the power (the throttlebody actually controls the throttle, not the PCM).
Hope that helps. John
I also noticed that while scanning the car while shut off, if you hit the pedal the TPS will report a change.
All good info, thanks. I guess what I should do is ask if the scanner could be changed to give us the commanded and the actual TP. Still not sure which one we are looking at in the scaner. Anyone know for sure?