I'm the other guy having the same problem. Both Q45 and RB25 TPSs show ~5V at idle and ~.5 at WOT. I'm pretty sure I have it connected to the right sensor, not the switch. I measured the resistances of both. They both showed ~0.8 kOhms at idle and ~4 kOhms at WOT. When I measure the harness side of the plug (unplugged), I get 5V on one wire, ~4V on the middle wire, and 0V on the last. Is that right, can someone be so kind as to measure theirs for comparison?
Also, can anyone tell me how to check the codes on my ecu? I have an SII RB25, but it has no LED or adjustment screw on the ecu case?