I'm not sure whether you were mainly talking about your position sensor or your throttle body -- you seemed to change from one to the other, but I may just be misinterpreting you. Also, you didn't describe what makes your sensor (or body) different from those in 240s, so my response here is only a guess at addressing your original post. However, that stated, let me offer the following:

There are two very different throttle position sensors that were routinely found in 240s despite being used with basically the same throttle body.

One is actually a switch (i.e., on and off are the two states, i.e., on idle or above idle) found in LH2.0 (up to '84), 2.2 ('85 to around ~'87 or so) and 2.4 (up to and including '93) in mainly automatic transmission'd cars outside of California.

The other is not a switch, but rather a potentiometer (or rheostat ?), which provides more particular information on the exact degree of "gas pedal" -- i.e., not only when you're on or above idle, but also how far above idle are you pressing the gas pedal. This type is found on the later manual transmission'd cars, and on cars marketed in California; these have, essentially, the system called LH3.1.

[caveat: I may be a little off with my dates and equipment (manual or automatic), but I know that I'm close :-).]

So is this, the potentiometer style of LH3.1, what you were talking about?