hi mate sounds like the coil pack had gone down and has spiked your module, with the ignition on you should have battery voltage in the middle pin of the coil pack multi plug and a switched earth at the other two pins one side will fire 1&4 and the other side will fire 2&3, you can check the earth is being sent by the module by using a side light bulb, if it flashes one side and not the other then as long as the wiring to the module is ok it the module itself. hope this helps.