What source is this? I wired mine using all the existing EFI relays. Also, do ANY led's flash when you put the key in the ON position?
The injector(+) are ALWAYS hot from the factory, in a ZX they are at least.
Since the coil is getting hot, I have a feeling that the ignition part is wired up wrong. Could you describe your wiring?
If the factory relays and harness are still in the car, I would recommend using it. If not, the relay board might be a good investment.
I have attached the wiring diagram for the factory ECCS from the FSM, hope that helps,
Mario