Iat sensor stuck at same temperature.
 

My iat is stuck at -40 degrees, it is a two wire iat, with a grey plug. cel for the iat has been on for the past 2 yrs and emissions are coming up soon, cant pass unless it's fixed. Brand new engine wiring harness, 5 point ground kit. Swapped out ECU's and problem continues, currently a stock a/t ka24de s14. Also has egr delete, not sure if its linked up to anything else in a circuit some way(unused plugs).Tried different iat's from new, to some from the junkyard and all of them are the same way. What am I missing?