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It's electronic.
It doesn't use a Map sensor , it use a MAF sensor , and it is located right on top of the Air filter box
Inside the fuel (petrol) tank.
Under the dash, on the passangers side.
On top of the engine, but you have to remove the cover to see them.
If the AC stopped blowing air on your 2003 Toyota Echo, the blower fuse could be to blame. If the fuse is fine, it might be the blower resistor that needs to be replaced.
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The one closest to the exhaust manifold is the upstream O2 sensor.
You can get a refurbished one for about $70. See: http://lmgtfy.com/?q=toyota+echo+mass+airflow+sensor
Its included in the following instructions for changing out the post cat O2 sensor. http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor
The 2003 Toyota Echo takes 22" drivers side and 14" passenger side replacement windshield wiper blades.
It is inside the Mass Airflow Sensor (MAF sensor), IN OTHERS WORDS IS PART OF THIS.