Spent several hours on this today and even more confused now.
I removed the 3 ping plug from the coil pack and with the ignition turned on I put my volt meter on the middle pin and then the negative side to the outer green/black wire and get a reading of 11.2V.

I then move the negative probe to the orange/black wire and only get 3.7MV.
When I crank the engine over the voltage reduces to 7-8V on the green/black wire and 47MV on the orange/black wire.

This leads me to think there is a fault with the orange/black wire or if this wire goes back to the ecu then a fault with the ECU.

I've traced this wire to as far as where it goes through the bay to the interior but then it's mission impossible due to the amount of sound deadening inside the car. I tried cutting the stuff away and pulling the hell out of it but it's going to take hours to try and remove it.

I may by one of those wire tracing probes off ebay and see if it's quicker to trace it ?

Any thoughts would be most appreciated