There are many steps before determining the ecu is faulty. What steps were taken to clear the codes? Any diagnostics performed other than just checking and clearing the codes? If several ecu's are showing the same codes you might actually have a problem that would trigger one or more of these codes. The TSRM should have a section for the proper procedures on diagnosing and correcting the cause of each of the codes. Your going to have to read, test stuff and follow directions carefully but if everything checks out according to the manual, yes, you just might have several bad ecu's.
If ALL the wires are perfect you are very lucky. The engine wiring certainly isn't a strong point of the supra. Happy headaches!
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