If there is no ground to the MFI relay, that prevents power to multiple components. Have you checked the connector at the PCM to see if there are any issues with the pin, connector, or wiring? Have you disconnected the PCM and checked for a ground path right at the PCM? See pics 1 and 2.
Also, the lack of communication with the DLC it likely related. The remaining pics below are the diagnostics for an unresponsive DLC. Take a look through them and let me know if you have questions. Also, note that the diagnostics are for both an automatic transmission and manual transmission. There are variations indicated.
Let me know.
Joe
See pics below.
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Thursday, January 19th, 2023 AT 8:28 PM