If the Black/White wire does not have any battery voltage, you have a power supply fault.
Since ECU replacement did not solve the problem, it could be a power source failure to the ECU that triggers the fault.
Have you checked all the fuses and power supply to the ECU?
Try using a fused jumper wire to the ignition coil power source ( Black/White wire and test if you could start the engine.
Wednesday, August 10th, 2011 AT 7:42 PM