Quote:
Originally Posted by etc
Thanks for the responses guys (and jackson racing). I think the part I was missing and it took me a little while to get is that you are saying that the ecutek tune does not overwrite the entire ecu program memory, only part of it. So the OBDII sections of the ecu will be whatever they were at the last version that toyota wrote to it.
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Mostly yes. Only the parts that alter how the engine runs (e.g. fueling, timing) are modified. Everything else is left alone to preserve as much OEM functionality as possible.