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I thought the 07 Yaris is chain driven. I suppose the older Echo is belt driven. The car should be able to adjust the tension on it's own since the tensioner should be spring loaded.
My last car, I had to change the timing belt twice (since it wasn't chain driven), before I retired the car (total cost about $1000). It's an expense I'm going to try and avoid in the future.
Yarisworld.com should have an downloadable work-manual for the Echo. I managed to download one for the 07 Yaris. Not that'll it help, since I'm not mechanically savvy.
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