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J1939-73
REV.
December
2008
SURFACE
VEHICLE
RECOMMENDED
PRACTICE
Issued 1996-02
Revised 2008-012
Superseding J1939-73 SEP2006
Application Layer - Diagnostics
RATIONALE
Changes in the December 2008 Version include: Figure H1, far right box should have DM12 not DM11. New appendix
added to fully describe lamp status and lamp flash. Text added to clarify format of messages with DTCs. Corrected DM19
figures to refer to the correct Acknowledgement PGN. Appendix A was updated to provide more specific guidance on the
FMIs to use when declaring OBD DTCs. More DM19 changes to clarify byte order for Cal ID transmission. Identified
DM19 response while CVN is first being computed. A DM7 and DM30 convention was established to report test results for
all tests of a system (i.e. a system or component is identified with a specific SPN).Added appendix J to clarify OBD
readiness bit construction.Changes in the September 2006 version: This SAE Recommended Practice has been updated
to support manufacturers’ new requirements, and new On Board Diagnostic (OBD) regulatory requirements for light duty,
medium duty and heavy duty vehicles. These cover the needs of US EPA, US CARB, EU, and World Wide Harmonization
of OBD. The following updates made: APPENDIX G, listing non-OBD fault management narratives, DM22 (Individual
Clear/Reset of Active and Previously Active DTC), DM23 (Previously Active Emission Related Faults), DM24 (SPN
Support), DM25 (Expanded Freeze Frame), and DM26 (Diagnostic Readiness 3), a revised definition for DM6, and
updates to the DM1 for lamp flashing and a fixed 1 second update rate, DM27 (All Pending DTCs), DM28 (Permanent
DTCs), DM29 (Regulated DTC Counts), DM30 (Scaled Test Results),DM31(DTC to Lamp Association), DM32 through
DM52, and the addition of 2 new FMIs (FMI 20 Data Drifted High, and FMI21 Data Drifted Low).
FOREWORD
The J1939 series of SAE Recommended Practices has been developed by the Truck and Bus Control and
Communications Network Subcommittee of the Truck and Bus Electrical and Electronics Committee. The objectives of
the subcommittee are to develop information reports, recommended practices, and standards concerned with the
requirements, design, and usage of devices which transmit electronic signals and control information among vehicle
components.
These SAE recommended practices are intended as a guide toward standard practice and are subject to change so as to
keep pace with experience and technical advances.
TABLE OF CONTENTS
1.
(R)Scope....................................................................................................................................................... 6
2. References.................................................................................................................................................... 7
2.1 Applicable Publications ................................................................................................................................. 7
2.1.1 SAE Publications........................................................................................................................................... 7
2.1.2 (R)On Board Diagnostics Regulations.......................................................................................................... 7
3. (R)Definitions ................................................................................................................................................ 8
3.1 Active............................................................................................................................................................. 8
3.2 Broadcast...................................................................................................................................................... 8
3.3 Calibration..................................................................................................................................................... 8
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