Stick your head under the dash and look up, sort of near where the driver's left knee would normally be.
The 2002 Toyota Echo OBD 2 port is under driver side dash next to kick panel
See related questions.
yes
In the gas tank. I have 2001 Echo.
2001 Toyota Echo doesn't have a timing belt.
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
3.5 Liters
see link
timing chain.
32 PSI
It's an easy job, details can be found here: http://groups.msn.com/Sorensonbrian/yourwebpage.msnw