I first posted this in the ECU forum, but I don't think enough people would see it there, and it doesn't really relate to any ONE ECU....just ECUs in general

I am going to be swapping out my stock ECU for an M2 Stage III ECU. I know how to get TO the ECU, but after that...????

I know you can just disconnect the harness, but someone said to make sure not to pull the ground wires. Which ones are those? Anyone have a picture that would show what to disconnect?

 

There is only one ground there that i know of and that bolts to the frame of the car. I just unplugged all of te 4 yellow plugs and plugged them into the new one with no trouble at all beside the PFC wire cutting.

~Luke

 

First order of business, disconnect the negative battery cable!

Then just unplug the harnesses, and plug them into the new ECU.