Fault diagnosis principle of J1939 cable

Fault diagnosis principle of J1939 cable

The fault diagnosis principle of J1939 cable provides important guarantee for the reliable operation of commercial vehicles. The J1939 protocol includes comprehensive online fault diagnosis functions defined by the diagnostic application layer.

In terms of security, the data link layer defines a security framework that enables development tools that comply with industry standards to perform necessary diagnostic tasks such as obtaining diagnostic information, obtaining node configuration information, and calibrating control modes, while encrypting non open data to protect data security.

In terms of connection, the connection between J1939 network nodes and development tools has been standardized, and the design of diagnostic connectors must also comply with the J1939 protocol to ensure reliable connection between diagnostic equipment and vehicle networks.

In terms of diagnostic status data support, a series of data formats are provided, including reading error data, clearing error data, monitoring communication parameters, and obtaining node configuration information. Through these data, maintenance personnel can quickly locate the location and cause of the fault.

The diagnostic testing support function enables development tools to place various control nodes into specific testing modes to correctly design subnet systems. The diagnostic tool communicates with other nodes through connectors to obtain diagnostic data, and all control nodes have functions such as reading and clearing diagnostic fault codes, and obtaining real-time information. For example, when the engine malfunctions, the engine controller will record the fault code, and maintenance personnel can accurately determine the type of fault and improve maintenance efficiency by reading the code through diagnostic tools.