dodgedad
Member
I have a 2004 JD 310SG that is throwing the F9C4 code and have been told that it means no communication between the the ECU and inside the cab somewhere. Checked the two red wires going to the ECU and got power on one with the ignition switch on and no power to the other one at all. Does anyone have a wiring diagram out there that i could use to trace this down. Does the ECU give lots of problems on these machines ? thanks