Bmauldin89
Member
Working on a 648g3 skidder, getting codes f475 fuel derate and f477 security violation. Ecu has been replaced but having same issue. No other fault codes are coming up.. anyone with experience on this issue? Tia
Kenneth’sWelcome to HEF 89! Serial number? Is this something that recently started? Also check your fuel gauge and back up alarm circuits for shorts to ground. These circuits have been known to cause those codes. Check in your monitor for any other codes active or stored and report back.
i think my issue is in the monitor itself, iv traced the harness back to the fuel sender and alarm and it checks out. I’m also not getting any other fault codesWelcome to HEF 89! Serial number? Is this something that recently started? Also check your fuel gauge and back up alarm circuits for shorts to ground. These circuits have been known to cause those codes. Check in your monitor for any other codes active or stored and report back.
I’ve done that. Codes stay activeFirst press and hold the menu button until service mode pops up. The you will have the option to clear the codes. Clear them. Then unplug the backup alarm/fuel sender harness from the transmission harness. Then run machine to see if the codes come back (note that you will get an open circuit code for the sending unit).