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there are no 2000 yaris that would be an echo
Check the fluid.
Yes. The fluid should look clean and pink.
Transmission fluid will last roughly 70,000-80,000 miles so anywhere in there.
Depends if you have automatic or manual transmission. Automatic trans fluid is type T-IV, which is a special type made by Toyota, I think I heard somewhere that a 3rd party was selling this type but I haven't seen it personally. You can buy T-IV ATF from the dealership or some online places including eBay at a slight discount.
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
no idea it is probably using the brake fluid
Because your transmission cable is broken and it must be broken near the transmission end You have to See your mechanic in transmission to replace it
The 2002 Toyota Echo OBD 2 port is under driver side dash next to kick panel
The first one is faster
For automatics, there is no manufacturer defined change interval. If you drive in dirty conditions a lot, you might want to change it every 80k miles. Under normal conditions you may not want to ever change it. There are echo's on the road with 400,000 miles that have never had a transmission fluid change.
In any automatic transmission the fluid should be changed at the interval specified by the manufacturer. You should have the transmission oil filter replaced also at this time. Many shops will just suck out the old fluid and replace it with new without replacing the oil filter.