wiring question

On the rear harness there is a brown wire with black stripe that is for engine temperature to run the fans (I have the wiring diagram from Blas, just not with me right now) is this sensing temperature from an engine block temp probe or a coolant temperature sensor located in the intake manifold, thanks
That Brn/Bk wire is intended to give an FI ECU control over the fans. Grounding this wire produces the same action as engaging the fan override switch on the dash. The water temp sensor is up front on the drivers side of the radiator.
Good luck,