TPS Signal voltage 5v at idle?

[Jclarkb43]

Hello all, 

Ive been doing some extensive trouble shooting regarding my TPS signal voltage. The car is a 1990 r32 GTST with a RB25DET S 2.5  ( last production before the neo, has neo ecu, neo cas, neo maf). But the TPS is the s2. Back probing the signal wire i get ~4.5 volts but also unplugged i get about the same.. ive gone as far as removing the TPS signal wire from the ECU plug and testing at the ECU pin 23 which is getting the same voltage which means its getting it from the ecu... ive tired a stock ECU and a WC34 NIStune ECU and they both do the same thing.. that car drives and runs a little on the rich side. The only think that changes the voltage is if i pull the ECCS relay it goes down to ~1v or if i unplug the grounds it goes up to ~8 volts any help would be greatly appreciated.