Hi All,

The IAT sensor readout on my EMS seems to be stuck at 77 degrees. No mater if it is 75 degrees out or 50 degrees out or if I am cruizing or under boost the EMS is still showing the IAT to be 77 degrees.

I tried unplugging the IAT sensor and the EMS still showed 77 degrees. Sometimes it cycles very quickly between -100 and +77, and other times it holds a steady 77 degrees.

Is my sensor fried, wiring screwed up, or the EMS broken?? Please help

EVOlutionary

 

i would think it would be a bad ground somewhere. I had that problem with the tps and map sensor rapidly moving to some crazy numbers. Turned out that there was a bad ground on the engine harness near the aem. (not my car)

 

I believe 77 deg is the default error readout, so if the sensor has a bad connection or is hooked up incorrectly that is what it will default to.

 

Bingo! Got a new IAT sensor today and hooked it up. 65 degrees, which is ambient. Unplugged it and it went right back to 77, so 77 is the default/failsafe.

Thanks for the help!

EVOlutionary