the computer on the car

No. Go to any auto parts web site and look up your vehicle's engine computer to see what yours should look like. (It'll look like a small metal case.)

That looks like a wiring harness connector.

No, the ECM is located under the air filter box. The correct name for it is Powertrain Control Module (PCM). ECM was the name given to OBD I computers made before 1996. Those letters stand for Electronic Control Module. Hope that helps! Jim