Gray wire on an EMB/94 miata
 

I've tried to set the range on the TPS and it isn't working. I currently do not have the grey wire hooked up to anything - is it necessary on a 94? If so, what harness wire do I hook it to? Is it a tapper?

TPS wire(gray) needs to be hooked to some high and low voltage source to set the range. What are you trying to use it for?

the tps wire is auto setting...normally you just hook it up and when in calibration mode you floor the throttle then release it and it records the highest and lowest voltages to set the TPS percentages....if your using it for data logging then you need to feed a signal into it to get it to calibrate such as 5volts or 1 volt...you cant just tell it that 1 volt is 100%, you have to SHOW it 1 volt on the wire.

I'm still figuring this thing out, so forgive me if I sound uneducated (i am). I was hoping to use throttle position to help me collect datalog information. TPS might help me set up some base maps so that when I take it to the dyno I'm fine tuning a rough map instead of building a map from scratch. Can you not use TPS as a parameter in setting up, say, the injector duration table?