UK Car Repair Questions? Ask a Mechanic for Answers ASAP
who tested the ECM? And do you have the ability to program another ECM to the vehicle and see if there is a change?
The only problem is that when they test it, it has been unplugged. Something is closing a circuit and holding it like that, unless it gets unpowered for a while.
so does the check engine light come on in the cluster, when the car will NOT start? That would indicate that the ECM is not "on line"
That seems to indicate that it is something inside the ECM then, good power and ground and ignition signal but no ECM activation.