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The problem with this error is there no way to determine which one is bad for certain. All you can do is check the wire connections between the MCU and CCU and make sure they are plugged in securely. If that all checks good, then replace the MCU first. That is the problem 90% of the time in my experience and sometimes if you remove the MCU and look on the back of the board you'll actually see a burn mark (not always). Either way, replace the MCU first and if the issue continues then replace the CCU and return the MCU. Most places don't allow returns for parts so I would recommend Repairclinic.com which does allow returns on control board which is a great option to have with communication issue like this one where you can't test to be certain which one is bad.
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What you have researched is likely free internet stuff which is rarely accurate and the reason this site is not free. You are talking to someone (me) who has been trained by Whirlpool/Maytag/etc.. factory. What you read isn't accurate. As for the specs and wiring diagrams, those are inside the washer. If you remove the front panel of the washer there is a folded up booklet of paper inside a plastic bag taped to the right or left side wall inside the washer if the technician didn't remove them already.
There is no spec for that I'm afraid. Not written and I've never seen one cause the problem so I really wouldn't be focusing on it either.
Yes, I'm very familiar. I probably have seen it 100 times or more to be honest. That's why I said it's usually the MCU.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?