I feel like it's supposed to be 0-1v but really the way to test it is to measure the resistance (Ohm Ω) at different temperatures.
These guys that sell the kits that fake them online for track use claim they vary the voltage or whatever but I think I remember just slapping a 9 ohm resistor on my STi once and having that work too. (Although it was pro-tuned and they knew about it not sure how a stock ECU on a newer BRZ would react to that)
https://www.magnumtuning.com/en/deta...tor/subaru/brz
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