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1、Copyright 1996 Society of Automotive Engineers, Inc. All rights reserved. J1979 REV. SEP97 E/E DIAGNOSTIC TEST MODES TABLE OF CONTENTS 1. Scope . 3 2. References . 4 2.1 Applicable Publications . 4 2.1.1 SAE Publications. 4 2.1.2 ISO Publications. 4 2.1.3 California ARB Publications. 4 2.1.4 Federal
2、 EPA Publications. 4 SAE J1979 SAE J1979 Revised SEP97 -2- 3. Definitions .4 3.1 Absolute Throttle Position Sensor .4 3.2 Bank.4 3.3 Base Fuel Schedule.4 3.4 Calculated Load Value.5 3.5 Continuous Monitoring.5 3.6 Fuel Trim.5 4. Technical Requirements .5 4.1 Diagnostic Test Mode General Conditions .
3、5 4.1.1 Multiple Responses to a Single Data Request .5 4.1.2 Response Time.5 4.1.3 Minimum Time Between Requests From Scan Tool.5 4.1.4 Data Not Available .5 4.1.5 Maximum Values .6 4.2 Diagnostic Message Format .6 4.2.1 Addressing Method.6 4.2.2 Maximum Message Length.6 4.2.3 Diagnostic Message For
4、mat .6 4.2.4 Header Bytes.7 4.2.5 Data Bytes .7 4.2.6 Non-Data Bytes Included in Diagnostic Messages With SAE J1850.7 4.2.7 Non-Data Bytes Included in Diagnostic Messages With ISO 9141-2 .7 4.2.8 Bit Position Convention.8 4.3 Allowance for Expansion and Enhanced Diagnostic Test Modes.8 4.4 Format of
5、 Data to be Displayed .8 5. Test Modes .9 5.1 Mode $01Request Current Powertrain Diagnostic Data .9 5.1.1 Functional Description .9 5.1.2 Message Data Bytes.9 5.2 Mode $02Request Powertrain Freeze Frame Data.9 5.2.1 Functional Description .9 5.2.2 Message Data Bytes.10 5.3 PIDs for Modes $01 and $02
6、.10 5.4 Mode $03Request Emission-Related Powertrain Diagnostic Trouble Codes .17 5.4.1 Functional Description .17 5.4.2 Message Data Bytes.18 5.4.3 Powertrain Diagnostic Trouble Code Example .19 5.5 Mode $04Clear/Reset Emission-Related Diagnostic Information .20 5.5.1 Functional Description .20 5.5.
7、2 Message Data Bytes.20 5.6 Mode $05Request Oxygen Sensor Monitoring Test Results .20 5.6.1 Functional Description .20 5.6.2 Message Data Bytes.21 5.7 Mode $06Request On-Board Monitoring Test Results.24 5.7.1 Functional Description .24 5.7.2 Message Data Bytes.25 5.7.3 Message Example .28 5.8 Mode $
8、07Request On-Board Monitoring Test Results.30 5.8.1 Functional Description .30 5.8.2 Message Data Bytes.30 5.9 Mode $08Request Control of On-Board System, Test, or Component.31 5.9.1 Functional Description .31 SAE J1979 Revised SEP97 -3- 5.9.2 Message Data Bytes.31 5.9.3 Test ID and Data Byte Descri
9、ptions.32 5.10 Mode $09Request Vehicle Information .32 5.10.1 Functional Description .32 5.10.2 Message Data Bytes.33 5.10.3 Vehicle Information Types and Data Byte Descriptions.33 5.10.4 Message Example .35 6. Notes .36 6.1 Marginal Indicia.36 1.ScopeThis SAE Recommended Practice defines diagnostic
10、 test modes, and request and response messages, necessary to be supported by vehicle manufacturers and test tools to meet the requirements of the California OBD II and Federal OBD regulations, which pertain to vehicle emission-related data only. These messages are intended to be used by any service
11、tool capable of performing the mandated diagnostics. In addition, capabilities are defined that are intended to meet other Federal and State regulations pertaining to related issues such as Inspection and Maintenance (I/M) and service information availability. This document provides the mechanism to
12、 satisfy requirements included in regulations, and not all capabilities included in this document are required by regulations. This document also is not considered a final authority for interpretation of the regulations, so the reader should determine the applicability of the capabilities defined in
13、 this document for their specific need. Diagnostic Test Modes included in this document are: a.Mode $01Request Current Powertrain Diagnostic Data Analog inputs and outputs Digital inputs and outputs System status information Calculated values b.Mode $02Request Powertrain Freeze Frame Data Analog inp
14、uts and outputs Digital inputs and outputs System status information Calculated values c.Mode $03Request Emission-Related Powertrain Diagnostic Trouble Codes d.Mode $04Clear/Reset Emission-Related Diagnostic Information e.Mode $05Request Oxygen Sensor Monitoring Test Results f.Mode $06Request On-Boa
15、rd Monitoring Test Results for Non-Continuously Monitored Systems g.Mode $07Request On-Board Monitoring Test Results for Continuously Monitored Systems h.Mode $08Request Control of On-Board System, Test, or Component i.Mode $09Request Vehicle lnformation For each test mode, this specification includ
16、es: a.Functional descriptions of test mode b.Request and response message formats For some of the more complex test modes, an example of messages and an explanation of the interpretation of those messages is included. SAE J1979 Revised SEP97 -4- 2.References 2.1Applicable PublicationsThe following p
17、ublications form a part of this specification to the extent specified herein. Unless otherwise specified, the latest issue of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1850Class B Data Communication Network Interfac
18、e SAE J1930E/E Systems Diagnostic Terms, Definitions, Abbreviations, and Acronyms SAE J1962Diagnostic Connector SAE J1978OBD II Scan Tool SAE J2012Recommended Format and Messages for Diagnostic Trouble Codes SAE J2186Diagnostic Data Link Security SAE J2190Enhanced E/E Diagnostic Test Modes 2.1.2ISO
19、DOCUMENTSAvailable from ANSI, 11 West 42nd Street, New York, NY 10036-8002. ISO 9141-2:1994(E)Road vehiclesDiagnostic systemsCARB requirements for interchange of digital information ISO/FDIS 14229:1998(E)Road vehiclesDiagnostic systemsSpecification of diagnostic services ISO/FDIS 14230-3:1997(E)Road
20、 vehiclesDiagnostic systemsKeyword Protocol 2000Part 3: Implementation ISO/DIS 14230-4Road vehiclesDiagnostic systemsKWP 2000 requirements for Emission-related systems 2.1.3CALIFORNIA ARB DOCUMENTSAvailable from California Air Resources Board, 9528 Telstar Avenue, El Monte, CA 91731. California Code
21、 of Regulations, Title 13, Section 1968.1Malfunction and Diagnostic System Requirements1994 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks, and Medium- Duty Vehicles and Engines (OBD II) 2.1.4FEDERAL EPA DOCUMENTSAvailable from the Superintendent of Documents, U.S. Government Printing O
22、ffice, Washington, DC 20402. Environmental Protection Agency 40 CFR Part 86Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines; Regulations Requiring On-Board Diagnostic Systems on 1994 and Later Model Year Light-Duty Vehicles and Light-Duty Trucks 3.DefinitionsMost terms
23、for components and systems contained in this document are included in SAE J1930. This section includes additional definitions of terms not included in SAE J1930. 3.1Absolute Throttle Position SensorThis value is intended to represent the throttle opening. For systems where the output is proportional
24、 to the input voltage, this value is the percent of maximum input signal. For systems where the output is inversely proportional to the input voltage, this value is 100% minus the percent of maximum input signal. Throttle position at idle will usually indicate greater than 0%, and throttle position at wide open throttle will usually indicate less than 100%. 3.2BankThe group of cylinders which feed an oxygen se