Engine Emanage Ultimate water temp connection causing car to overheat.

Emanage Ultimate water temp connection causing car to overheat.

I hooked up my EMU to monitor my water temp so that I can use the cold start map. When I check my datalog, I see that it's reporting back the temp, but it shows it lower than what the car's gauge is. When I'm at idle or even driving, the car starts to overheat (start smelling burning coolant) because the radiator fans won't turn on. As soon as I disconnect the wire to my e-Manage, the fans turn back on. Has anyone else had this issue? I'm using the most current firmware and software. Also, does the water temp connection need to be wired in for me to use the Target AF map, because mine won't work (I even left the temp units at Celsius instead of Fahrenheit since there was a bug with that).

i'm not 100% sure on the newer models.... but i would be surprised if toyota narrowed down the number of coolant sensors down to 1.... because that makes the entire coolant system weaker (ie, if 1 sensor goes bad then you lose your fan, your gauge, and your ecu sensor).... if there is only 1 sensor then I would look into the following:

go to a local radio shack and see if maybe a small 12v diode might help in this situation (and if not, what would act as a diode at a low current).... basically what could be happening is by connecting the sensor to the emanage you could be changing the resistance given off by the sensor..... using something like a diode would allow it to pick up the signal without having any sort of current fed back into the system.....

or you could go to a JY and find a sensor for a couple dollars and modify it in.....

if it's multiple sensors (ie if there is more than one coolant sensor) then you could be tapping the wrong sensor..... (ie, if you tap into only the sensor for the fans.... then they may not kick in actually causing the system to overheat and making your other sensors read hot.... because they are!)

I figured this one out: http://trdforums.com/forum/showthread.php?t=17911