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Hello. Welcome to Just Answer. Please allow me to assist you. Please advise of the make, model and year of the vehicle you have this problem with; thanks
No power to the ECU (assuming that all of the fuses associated with the ECU are good) would suggest that the EFI Mail Relay may be faulty. Did you check all of the fuses?
The EFI relay is mounted under the fuse panel in the engine compartment. You need to take the fuse panel apart to see it. This is a huge job if you are skilled in this type of disassembly.
The relay colors change depending on who supplies the parts. The best way is to check power. Power will be lost to it when you pull the 20 amp EFI fuse.
Sorry for the delay. It was snowing heavily here and the internet dropped out. The relay is supposed to be directly under the 20 amp EFI MAIN fuse (according to the Toyota service manual. )
Is this car in the USA?
According to the schematic I have the EFI relay is a solid state unit attached under a panel with 4 fuses on it. Not the main fuse panel Under the hood. One of these fuses is the EFI fuse. The power form the EFI fuse goes directly to the relay. If you can find the EFI fuse you will find the relay connected to it.