Has anyone heard of an M4 wire in the harnes to the ecm. I have looked at shcematics. and can see an M4 ecm is N3K6

 

What are you trying to figure out?

If you are wondering what to do with your relay connection issue... you would have the best cost/ benefit ratio to repair the connector under the relay. If you do it properly it will be as good as new and not require replacing the main and front harness and redoing all the connections

 

trying to find out the voltage to the relay to see if its sending. that make sense. and its the fuel realy. thought i had this yesterday we fixed the connection but the low flow fuel is not working and we are testing the resistor as well. LOKI told me to do this but i couldnt find it..i finally did hidden under some foam.