Absolutely. The ECM (and harness) must work with your engine, transmission, main relay, main electrical harness, sensors, fuse boxes, etc. There's so much more to properly doing these swaps than most people realize. That's why many of them fail, even for pretty good mechanics. All of this needs to be carefully thought out, before beginning the swap, because the vehicle ultimately has to pass emissions inspection. Close is not good enough, when your are working with sophisticated, computer-based electrical systems.
You may need to replace the ECM, ECM wiring harness, main electrical harness, fuse boxes, main relay, and main relay harness. Scope it out carefully.
It's much easier to drop in an identical rebuilt engine/transaxle that came in the car.
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