Open throttle TPS voltage is way low
Was about to mess with fuel maps on my FI Tuner Pro and the first thing the software wants you to do after connecting is calibrate the TPS. OK - fine. So, the software tells me to fully open the throttle so it can measure the "open" TPS voltage. I can see the voltage increase as I pull back, and it stabilizes at 2.37V (wide open throttle). Waiting for the software to say "ok, now do this", but nothing else happens - like it's still waiting for me to open the throttle. Well - I think I finally figured out why. It seems that the TPS spec voltage range is 1.1V (closed) to 4.3V (open). My measured CLOSED voltage is 1.09 (close enough), but my WIDE OPEN voltage is 2.37. This seems WAY LOW, so my questions are:
- Does this mean that my TPS is bad and needs to be replaced?
- Is the TPS resistance/voltage adjustable - meaning, can I somehow increase the TPS OPEN voltage to 4.3V? (I wouldn't think so.) The only TPS adjustments I've seen are the two adjustment screws used to get the middle and top LCD bars set to the correct RPMs (and I believe mine is ok - the last time I checked).
- How the heck can this thing be running ok (I think) if the TPS voltage output is so messed up?
- And finally, where's the best place to buy a new TPS?