sae j 1939-73
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__________________________________________________________________________________________________________________________________________
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J1939-73
REV.
SEP2006
SURFACE
VEHICLE
RECOMMENDED
PRACTICE
Issued 1996-02
Revised 2006-09
Superseding J1939-73 MAR2004
Application Layer - Diagnostics
RATIONALE
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
3.4 (R)Confirmed................................................................................................................................................. 8
3.5 (R)Continuously Monitored Systems ............................................................................................................ 8
3.6 Diagnostic Trouble Code .............................................................................................................................. 8
3.7 (R)Discriminatory .......................................................................................................................................... 8
3.8 Freeze Frame................................................................................................................................................ 8
3.9 Key ................................................................................................................................................................ 8
3.10 Malfunction Indicator Lamp........................................................................................................................... 9
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