On Board Diagnostics Implementation Guide
J1939/03
<p>SAE J1939-03 provides requirements and guidelines for the implementation of on-board diagnostics (OBD) on heavy duty vehicles (HDV) using the SAE J1939 family of standards. The guidelines identify where the necessary information to meet OBD regulations may be found among the SAE J1939 document set. Key requirements are identified here to ensure the interoperability of OBD scan tools across individual OBD-compliant vehicles.</p><p>Market-defined regulations permit the use of SAE J1939 to meet OBD requirements. Implementers are cautioned to obtain and review the specific regulations for the markets where their products are sold. This document is focused on guidelines and requirements to satisfy the State of California Air Resources Board (CARB), the authors of 13 CCR 1971.1, United States Environmental Protection Agency, Euro IV and V requirements from European Commission directives, and UN/ECE WP 29 GRPE WWH OBD Global Technical Regulation (GTR).</p>
Rationale: This version of SAE J1939-03 updates HD OBD reference to the adopted regulations from the July 2021 hearing, and adds HD IM references as adopted in the December 2021 hearing. Figure 2 updates define the connection procedures needed to accommodate SAE J1979-2. Section 8 informs the implementation of HD IM Remote OBD (ROBD) devices for the new HD IM regulations.