It defines protocols for DM14 through DM18 messages, which allow tools to read and write to specific memory locations within an ECU for calibration or specialized testing.
. It allows Electronic Control Units (ECUs)—like those managing the engine, transmission, or brakes—to report active faults and health status both during vehicle operation and while in the repair shop. Key Capabilities of J1939-73 sae j193973 pdf exclusive
Specifically clears active and previously active DTCs. It defines protocols for DM14 through DM18 messages,