Freightliner free help line
Have your serial number handy.
I'm interested what you find out , because I've never heard of the ECM monitoring fuses.
Edit: Did you check all the fuses ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.