標準號：SAE J1939-73-2006
英文標準名稱：Application Layer - Diagnostics
發布日期：2006/9/1 12:00:00
實施日期：1999/12/31 12:00:00
國際標準分類號：43.040.10
引用標準：SAE J1587;SAE J1939-03;SAE J1939;SAE J1939-13;SAE J1939-21;SAE J1939-71;SAE J1979;Title 13, California Code Regulations, Section 1968.2, Malfunction and Diagnostic System Requirements for 2004 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks,
適用范圍：The SAE J1939 series of recommended practices are intended for light- and heavy-duty vehicle uses on- or off-road as well as appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include, but are not limited to: on- and off-highway trucks and their trailers, construction equipment, and agriculture equipment and implements. The purpose of these documents is to provide an open interconnect system for on-board electronic systems. It is the intention of these documents to allow electronic devices to communicate with each other by providing a standard architecture. J1939-73 identifies the diagnostic connector to be used for the vehicle service tool interface and defines messages to accomplish diagnostic services. California, EPA, or EU regulated OBD requirements are satisfied with a subset of the specified connector and the defined messages. Diagnostic messages (DMs) provide the utility needed when the vehicle is being repaired. Diagnostic messages are also used during vehicle operation by the networked electronic control modules to allow them to report diagnostic information and self-compensate as appropriate, based on information received. Diagnostic messages include services such as periodically broadcasting active diagnostic trouble codes, identifiying operator diagnostic lamp status, reading or clearing diagnostic trouble codes, reading or writing control module memory, provide a security function, stopping/starting message broadcasts, reporting diagnostic readiness, monitoring engine parametric data, etc.