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
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
On a 2001 Toyota Echo, the knock sensor is located on the engine block, typically near the cylinder head. It is usually positioned on the side of the engine, often on the driver's side, and can be accessed from underneath the vehicle or through the engine compartment. To replace or inspect it, you may need to remove some components for better access.
It is inside the Mass Airflow Sensor (MAF sensor), IN OTHERS WORDS IS PART OF THIS.
The radiator sensor in a Toyota Echo is typically located near the radiator itself, often positioned on the radiator or in the upper or lower radiator hose. This sensor monitors the temperature of the coolant to help regulate the engine's temperature. If you need to access it, make sure the engine is cool and follow the vehicle's service manual for specific instructions.
Right next to the air filter.
See related link which includes instructions for testing any O2 sensor.
The 2002 Toyota Echo OBD 2 port is under driver side dash next to kick panel
the price i paid at the local Toyota dealer was around 177.00 for maf on my 2000 Toyota echo stmptoms were car weak power delayed fuel pickup this fixed it.plenty of power now
It is conveniently located inside the fuel tank :)
See related questions.