For instance in HEX format MID 128 = HEX (80). Let's look at this first example fault code:ĭo you know what it is off the top of your head? WHAT IS MID? The most common protocol for the trucking industry is J1939, which communicates at the faster 250k baud rate. This communication is usually more common on trucks that are older than 2013 year model year. Not all manufacturers use this protocol to transmit the engine related fault codes. The channel for communication happens on this low speed protocol. This is because the heavy duty industry adapted to use the J1587/J1708 for the way they opted to send diagnostic fault code messages on older trucks. The message format for J1587/J1708 fault codes. You can purchase these documents from SAE website. In heavy-duty applications, this is the primary communication protocol depending on the manufacturer.Įngineering Level - You need both J1587 + J1708 document to understand the requirements for the hardware and the basic protocol. The SAE formed a document that is the underlying layer of the low-speed communication bus. Why is this important to know? It's good to understand the foundation of fault codes and where they originate from.
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