I am trying to find out which wire needs to be removed from the ECM to get rid of code C46 and the FI light with aftermarket exhaust on a 2008 C109R. I know this has been posted many times over but, everything I'm seeing is for the ECM wiring and pin placement for the M109's. Some say pin #4 some pin #7, black wire with brown trace. On the 2008 C109 there is only one wire with a brown trace but it is on the black ECM plug ( removing it does not cure C46 by the way). There are no wires present in the #4 or 7 position on the gray plug, just the factory white plugs where there are no wires.