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SURFACE VEHICLE
RECOMMENDED PRACTICE
J1939™-13
OCT2016
Issued 1999-07
Revised 2016-10
Superseding J1939-13 OCT2011
Off-Board Diagnostic Connector
RATIONALE
This revision adds reference to SAE J1939-16 baud rate detection when a diagnostic tool is designed to support either 250
kbps or 500 kbps vehicle networks. KbKb
FOREWORD
The SAE J1939 communications network is defined using a collection of individual SAE J1939 documents based upon the
layers of the Open System Interconnect (OSI) model for computer communications architecture. The SAE J1939-13
document defines the diagnostic connectors for off-board connection to the SAE J1939 communications network.
The SAE J1939 communications network is a high speed ISO 11898-1 CAN based communications network that supports
real-time closed loop control functions, simple information exchanges, and diagnostic data exchanges between Electronic
Control Units (ECUs) physically distributed throughout the vehicle.
The SAE J1939 communications network is developed for use in heavy-duty environments and suitable for horizontally
integrated vehicle industries. The SAE J1939 communications network is applicable for light-duty, medium-duty, and heavy-
duty vehicles used on-road or off-road, and for appropriate stationary applications which use vehicle derived components
(e.g., generator sets). Vehicles of interest include, but are not limited to, on-highway and off-highway trucks and their trailers,
construction equipment, and agricultural equipment and implements. The physical layer aspects of SAE J1939 reflect its
design goal for use in heavy-duty environments. Horizontally integrated vehicles involve the integration of different
combinations of loose package components, such as engines and transmissions, that are sourced from many different
component suppliers. The SAE J1939 common communication architecture strives to offer an open interconnect system
that allows the ECUs associated with different component manufacturers to communicate with each other.
