: Describes the type of failure (e.g., Voltage Above Normal, Data Erratic).
This standard provides the framework for "Diagnostic Messages" (DMs) used during both active vehicle operation and stationary repair. sae j193973 pdf exclusive
That standard covers DM1 (active DTCs), DM2 (previously active DTCs), DM3 (clear DTCs), DM4 (freeze frame), etc. It's widely used in commercial vehicle diagnostics. : Describes the type of failure (e
The standard specifies how Electronic Control Units (ECUs) report their status during both vehicle operation and repair . Key functions include: Voltage Above Normal