Describes the type of failure occurring (e.g., voltage too high, short circuit, or data erratic). FMIs are 5-bit numbers ranging from 0 to 31.
: Provides real-time broadcast of current issues via Diagnostic Message 1 (DM1). Sae J1939-73 Pdf
| DM | Name/Function | PGN | |---|---|---| | DM1 | Active Diagnostic Trouble Codes | 65226 | | DM2 | Previously Active DTCs (Historical) | 65227 | | DM3 | Clear/Reset Previously Active Faults | 65228 | | DM4 | Freeze Frame Parameters | — | | DM5 | Diagnostic Readiness | — | | DM6 | Continuously Monitored System Test Results | — | | DM7 | Command Non-Continuous Test | — | | DM8 | Non-Continuous Test Results | — | | DM9 | Oxygen Sensor Test Results | — | | DM10 | Non-Continuous Monitoring System Test ID Support | — | | DM11 | Clear/Reset Active Faults | — | | DM12 | Emissions-Related Active DTCs | — | | DM13 | Stop/Start Broadcast | — | | DM14 | Memory Access Request | — | | DM15 | Memory Access Response | — | | DM16 | Binary Data Transfer | — | | DM17 | Boot Load Data | — | | DM18 | Data Security | — | | DM19 | Calibration Information | — | Describes the type of failure occurring (e
J1939/73_202208 : Application Layer - Diagnostics - SAE International | DM | Name/Function | PGN | |---|---|---|
For example, a DTC might indicate: SPN 190 (Engine Speed) with FMI 3 (Voltage Above Normal) has occurred 2 times.