The injectors should have power all the time when in the "ON" position. The computer then grounds the circuit to open the injectors. Make sure the fuel pressure is adequate. If there is pressure but it is too low, the car may not run. Check the fuel pressure. If adequate, check for power to the injectors. If they have power, check for switching. Do a continuity check between the other pin on the harness and ground as you crank the engine. If no switchy, you probably need a new ECU.