Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
Check the 40 amp ECU fusible link. This provides power directly from the battery to the main relay which feeds the other ECU fuses.
This is at the top next to the 120 amp ALT link and above and to the right of the ECU fuses you are seeing.
If the 40 amp is good swap the ECU relay with another as it is not turning on.
Let me know if you find these and how I can help
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Glad to help and please let me know if you have further questions