To change the idler pulley on a Toyota Echo, first, ensure the engine is off and cool. Remove the serpentine belt by loosening the tensioner pulley using a wrench or ratchet. Once the belt is removed, unbolt the old idler pulley from its mounting bracket and replace it with the new one. Reinstall the serpentine belt, ensuring it is correctly routed, and then check the tension before starting the engine.
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
Which bulb are you trying to change?
hi i have smal question,how to change thermostat in Toyota echo 2000 thanks
See related link. Its not an Echo, but close enough.
For my 2002 Echo it is 3.7 Liters with a filter change.
http://groups.msn.com/Sorensonbrian/oilchange.msnw
see link
you cant
Toyota Echos have a timing chain rather than a timing belt so there is no need to change it.
See related link
How to open hood on Toyota echo
http://groups.msn.com/Sorensonbrian/atfchange.msnw