Hopefully a chiltons or haynes manual should have it, if not try this link, they charge for info, but if all else fails... http://www.alldatadiy.com/
yes
In the gas tank. I have 2001 Echo.
search for echo manual torrent
Go to autozone.com..Repair instructions.Look for serpentine belt.May be a routing image there.
2001 Toyota Echo doesn't have a timing belt.
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
Doubt it is different from the older model years, a diagram was posted on this website for an older model echo.
3.5 Liters
The 2002 Toyota Echo OBD 2 port is under driver side dash next to kick panel
timing chain.
32 PSI