i would say all the way to the floor hitting the kickdown switch.
the reset prodcedure gets you to set the reference for closed throttle and fully open throttle. it would generate a voltage b/w ~0 to 5v. so to set the range you would need the position of both closed and max full throttle.
all the kick down switch does is tell the transmission (if engine rpms are approriate for the gear) to shift down 2 gears.
throttle 3/4 - it downshifts one gear say 5th to 4th.
if hitting the kickdown switch - downshifts two gears from 5th to 3rd gear... it may drop it even to 2nd depending on rpms and speed...
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