SDMO R 340 U User And Maintenance Manual page 287

FMI=20-30—RESERVED FOR SAE ASSIGNMENT
FMI=31—CONDITION EXISTS
Used to indicate that the condition that is identified by the SPN exists when no more applicable FMI exists or in cases when the
reported SPN name spells out the component and a non-standard failure mode. This type of fault may or may be directly associated
with the value of general broadcast information. This FMI will mean "not available" when the associated SPN is also "not available"
as when the remainder of the packet is filled with binary ones after all data has been transmitted.
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