yes as i wrote above - the diode idea wont work, as demonstrated by the 2nd graph. There is no clash of personality - msg2 is just wrong on this occasion.
The throttle when the peddle is fully up, i.e the car is idling, should be exactly the same as it was before any modifications where made.
The throttle when fully down, i.e full throttle, should be half what it is standard.
Every point between the two should be half what it is normally. That way every 1mm of throttle has half the effect.
Msg2 - using diodes doesn't achieve that does it.
Your explanation of the two sensors is incorrect. I posted above what the actual reason for them is.
If you havn't already got this far, check out:
http://www.bba-reman.com/content.aspx?content=nissan_dtc_po221_tps
You should have notice the opposite values, (yes for error prevention) but not in the way you specified.
So yes, take a step back, post an idea and let us discuss and criticise it.
The solution i suggested first: a divider op amp and a multiplier op amp saturated at the new maximum throttle voltage is still the easiest way to get the desired result - but maybe not the best?
