Diagnostics
No agreement at ISO/TC23/SC19/WG1 on method
- Appears to be support for proprietary through VT
- Some support in US for J1939-73
- J1939-73
- Defines run-time diagnostics
- Defines an Amber and Red light signal
- Predefines diagnosable objects (SPN)
- Predefines failure modes(FMI)
- Fault are broadcast as SPN:FMI:Occurance count List
- Defines storage of Active and previously active faults
- Includes methods for clearing faults
- Includes freeze frame capability