Sae j1939-73 Issued Feb96

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<p>400 Commonwealth Drive, Warrendale, PA 15096-0001</p> <p>SURFACE VEHICLE RECOMMENDED PRACTICE</p> <p>J1939-73</p> <p>ISSUED FEB96</p> <p>Issued</p> <p>1996-02</p> <p>Submitted for recognition as an American National Standard</p> <p>APPLICATION LAYER - DIAGNOSTICS</p> <p>ForewordThis 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 Foreword ........................................................................................................................................ 1 1. 2. 2.1 2.1.1 2.1.2 3. 3.1 3.2 3.3 3.4 3.5 3.6 4. 5. 5.1 5.2 5.2.1 5.2.2 5.2.2.1 Scope ............................................................................................................................................. 3 References ..................................................................................................................................... 3 Applicable Documents ..................................................................................................................... 3 SAE Publications ............................................................................................................................. 3 California Air Resources Board (CARB) Publication ........................................................................... 3 Definitions....................................................................................................................................... 3 Continuously Monitor Systems ......................................................................................................... 3 Diagnostic Trouble Code .......................................................................................................................... 3 Freeze Frame.................................................................................................................................. 3 Malfunction Indicator Lamp (MIL) ..................................................................................................... 3 Non-Continuously Monitored Systems .............................................................................................. 3 Readiness Code (see DM5) ............................................................................................................. 4 Abbreviations .................................................................................................................................. 4 Technical Requirements ................................................................................................................... 4 General .......................................................................................................................................... 5 Overview of Diagnostic Requirements ..................................................................................................... 5 Diagnostic Capabilities Emissions............................................................................................................ 5 Minimum Requirements ................................................................................................................... 5 Emission Related Components ........................................................................................................ 5</p> <p>SAE Technical Standards Board Rules provide that: This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user. SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCUMENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http://www.sae.org Copyright 1996 Society of Automotive Engineers, Inc. All rights reserved.</p> <p>Printed in U.S.A.</p> <p>SAE J1939-73 Issued FEB96 5.2.2.2 5.2.3 5.3 5.3.1 5.3.2 5.3.2.1 5.3.2.2 5.3.2.3 5.3.2.4 5.3.2.5 5.3.2.6 5.3.3 5.3.4 5.4 5.5 5.6 5.7 5.7.1 5.7.1.1 5.7.1.2 5.7.1.3 5.7.1.4 5.7.1.5 5.7.1.6 5.7.1.7 5.7.2 5.7.3 5.7.4 5.7.4.1 5.7.4.2 5.7.5 5.7.5.1 5.7.5.2 5.7.5.3 5.7.5.4 5.7.5.5 5.7.5.6 5.7.6 5.7.7 5.7.7.1 5.7.8 5.7.8.1 5.7.8.2 5.7.8.3 5.7.8.4 5.7.9 5.7.10 5.7.10.1 5.7.11 5.7.12 Non-Emission Related Components................................................................................................. 5 General Conditions for Diagnostic Procedures .................................................................................. 5 Security ......................................................................................................................................... 6 Data Link Security Strategy ............................................................................................................. 6 Data Link Access Examples ............................................................................................................ 6 Unsecured Read Data..................................................................................................................... 6 Unsecured Service Alternation ........................................................................................................ 6 Unsecured Permanent Alternation ................................................................................................... 6 Secured Read Data ........................................................................................................................ 6 Secured Service Alteration .............................................................................................................. 6 Secured Permanent Alteration ......................................................................................................... 7 Characteristics of Security ............................................................................................................... 7 Security Functional Requirements ................................................................................................... 7 Diagnostic Connector ...................................................................................................................... 7 Parameter Monitoring Requirements ................................................................................................ 7 Diagnostic Trouble Code Definition .................................................................................................. 7 Diagnostic Parameter Group (PG) Definitions ................................................................................... 8 Active Diagnostic Trouble Codes (DM1) ........................................................................................... 9 Malfunction Indicator Lamp ............................................................................................................ 12 Red Stop Lamp ............................................................................................................................. 12 Amber Warning Lamp .................................................................................................................... 12 Protect Lamp .................................................................................................................................13 Suspect Parameter Number (SPN) .................................................................................................13 Failure Mode Identifier (FMI) ...........................................................................................................13 Occurrence Count ......................................................................................................................... 13 Previously Active Diagnostic Trouble Codes (DM2) ..........................................................................14 Diagnostic Data Clear/Reset of Previously Active DTCs (DM3) .........................................................15 Freeze Frame Parameters (DM4) ....................................................................................................16 Freeze Frame Length ..................................................................................................................... 17 Freeze Frame Parameters .............................................................................................................. 17 Diagnostic Readiness (DM5) ..........................................................................................................17 Active Trouble Codes ..................................................................................................................... 17 Previously Active Trouble Codes .....................................................................................................17 OBD Compliance ........................................................................................................................... 18 Continuously Monitored Systems Support/Status .................................................................................. 18 Non-Continuously Monitored Systems Support ................................................................................19 Non-Continuously Monitored Systems Status ..................................................................................19 Continuously Monitored Systems Test Results (DM6)............................................................................ 20 Command Non-Continuously Monitored Test (DM7) .........................................................................21 Test Identifier .................................................................................................................................21 Test Results for Non-Continuously Monitored Systems (DM8) ...........................................................22 Test Type/Component Identifier .......................................................................................................22 Test Value .....................................................................................................................................22 Test Limit Maximum ....................................................................................................................... 22 Test Limit Minimum ........................................................................................................................ 23 Oxygen Sensor Test Results (DM9) ................................................................................................23 Non-Continuously Monitored Systems Test Identifiers Support (DM10) .............................................22 Test Identifiers Supported ............................................................................................................... 23 Diagnostic Data Clear/Reset for Active DTCs (DM11) ......................................................................24 Emissions-Related Active Diagnostic Trouble Codes (DM12) ............................................................24</p> <p>APPENDIX AFAILURE MODE IDENTIFIER CODES..........................................................................................26</p> <p>-2-</p> <p>SAE J1939-73 Issued FEB96 1. ScopeThe 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. 2. 2.1 References Applicable PublicationsGeneral information regarding this series of recommended practices is found in SAE J1939. The latest issue of the SAE J1939 publications shall apply. SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. Unless otherwise specified, the latest publication shall apply. SAE J1587Joint SAE/TMC Electronic Data Interchange Between Microcomputer Systems In HeavyDuty Vehicle Applications SAE J1939Serial Control and Communications Vehicle Network SAE J1939/21Data Link Layer SAE J1939/71Vehicle Application Layer SAE J1979E/E Diagnostic Test Modes 2.1.2 CALIFORNIA AIR RESOURCES BOARD (CARB) PUBLICATIONAvailable from Air Resources Board, HaagenSmit Laboratory, 9528 Telstar Avenue, El Monte, CA 91731-2990. Telephone (818) 575-6800. Mail Out #95-03, January 19, 1995. OBD II, California code of regulations, Title 13, 1968.1: Malfunction and Diagnostics Systems Requirements, 1994 and subsequent model year passenger cars, light-duty trucks, and medium duty vehicles with feedback fuel control systems 3. 3.1 Definitions Continuously Monitored SystemsContinuously Monitored Systems are those which are monitored approximately two times per second. Note that some continuous monitors may require many conditions to be true before monitoring can be performed. Diagnostic Trouble CodeA 4 byte value that identifies the kind of trouble, the associated failure mode and its occurrence count. Freeze FrameA sampling of a group of parameters based on the occurrence of a diagnostic trouble code. Malfunction Indicator Lamp (MIL)The MIL is used to report trouble codes that are emissions related. Trouble codes that are not emissions related will not illuminate the MIL. Non-Continuously Monitored SystemsSystem monitors that run once a trip. Trip, in this context, is as defined by OBD II. It should be noted that there will be monitors that wont run every trip (i.e., cold-start aid monitors may only run when the ambient temperature is below 10 C (50 F)).</p> <p>2.1.1</p> <p>3.2</p> <p>3.3 3.4</p> <p>3.5</p> <p>-3-</p> <p>SAE J1939-73 Issued FEB96 3.6 Readiness Code (see DM5)This is a code which is set once all of the emissions-related diagnostics have been performed. The readiness code shall be set before the completion of the cold portion of the Federal Test Procedure for Emissions Certification. Service tools can interrogate a controller to determine the state of the readiness code. If it is set, then the controller has...</p>

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