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It has always been a target of my device to write code to support alternate ECU's. The documentation is out there. The biggest issue with using a standalone with my small device is that most standalones pick a 1000kbit baudrate instead of the factory 500kbit. The magic of only using two CAN busses and making the gateway function work is that the factory GM controller uses 500kbit.
Get me a controller that outputs 500kbit CAN and I'll make a one of my controllers work for you. I've written code for a few standalones but they require a larger more expensive controller that has three busses to negotiate the gateway functionality.
Honestly though, just as a guy who has swapped a few vehicles and dealt with wiring issues, just pay the price for the proper harness. The Pure Automotive kit is great and complete. I understand saving pennies where you can, but this is a hobby where that can go very wrong very quick and lead to serious issues.
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Colin Beck
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