Interesting. That looks very similar to the Daewoo / Delco PCM that I obtained years ago with a 2000 2.0 DOHC GM / Daewoo engine. The big brother to this four cylinder is a 2.2L engine. A version of the 2.2 is available in the Trooper. Looking at pictures of the 2.2 and 3.5 Trooper ECM's convince me they are very similar.
When I started playing with this ecm there were few tools built that allowed one to attempt to unlock and download the pcm code through the diagnostic port. Today there are a few. One might allow you to use the GM algorithm to cread a key from a manually requested seed. I don't know if this is the best approach but it is one way to start.
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