E90 Ignition Coil Wiring Diagram. Plug dìsconnected for automatic transmission 24. One pin from coil pack plug cyl1 goes to dme plug pin 3.
The dme reads the voltage dropped on this resistor in synch with the ignition timing to detect which coil is bad if any. Below is a diagram illustrating the operation of the ignition coil fitted to this particular vehicle. Electric fuel pump 31.
Working at the valve cover disconnect the ignition coil electrical connectors.
This simplified wiring diagram of the ignition. This is why the ground wire is very important to be properly connected with. In the case of a conventional cylinder ignition coil the. One pin from every coil pack plug goes to the rw wire on the white 2 pin connector.