First. Get power for the AVCr somewhere else. There are enough sources of 12v in the car that you don't need to be sharing one with the most important component in the car.
If you are lucky, one of the connections for the AVCr broke the circuit to the ECU. If not, try taking the UTEC out of the loop. It probably won't start with your mods, but you can listen for the fuel pump. Really lucky and it just wants a hard battery reset.