You can also find the SAE J1939 protocol collection, including the J1939-73 PDF, on educational repositories and documentation sites that offer it for free alongside other parts of the J1939 standard.
This is the standard for passenger cars and light trucks. It uses a request/response architecture (a tool must ask for a DTC). It uses a diagnostic CAN bus (ISO 15765) that is separate from the main vehicle communication bus, and its connector and protocols are standardized under SAE J1962. Sae J1939-73 Pdf
Software developers do not have to reinvent proprietary code for every new heavy-duty vehicle chassis added to a fleet. You can also find the SAE J1939 protocol
Allows technicians to read historical logs for diagnostic context. Request-Response Captures real-time sensor data at the moment of failure. Multi-Packet Combined with J1939-21 It uses a diagnostic CAN bus (ISO 15765)
To fully comprehend the diagnostic capabilities of modern heavy-duty vehicles, the specification details several critical messaging components: 1. Diagnostic Messages (DMs)