For 5.1 boards
DB-9(female) Pin # Wire Color
2 Green
3 Red
5 Yellow
RJ45 connector pinout:
With clip facing down and end of connector facing you
1 empty
2 yellow
3 empty
4 green
5 empty
6 empty
7 empty
8red
Make sure to add a Ferrite ring to the RJ-45 (Tuner) end of the cable.
NEW STYLE for 5.2 boards
1. Check the continuity of your EEC-Tuner cable with a multimeter...only 5 of the wires in the 9 pin serial cable are used.
I dissected the broken eec tuner cable and came up with the pin out.
DB9
(the pins are numbered on the connector)
RJ45
DB9(9pin) <=> RJ45(8pin)
pin #2 <=> pin #5
pin #3 <=> pin #1
pin #4 <=> pin #3
pin #5 <=> pin #7
pin #9 <=> pin #2