Air temperature sensor

Hi. I have just bought a little chip that is supposed to improve the power of my 2003, 1.8, 140php, Celica VVTi. This is supposed to be connected to the terminals of the air temp sensor, but this isn't so easy. The best clue I've had so far is that it's combined with the mass air flow meter, But the problem here is that its connecter has 5 terminals and I can't identify the specific ones for the air temp sensor.

Can anyone help? idunno