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HJ 437-2008: Technical specification for on-board diagnostic(OBD) system of compression ignition and gas fuelled positive ignition engines of vehicles
HJ 437-2008
National Standard for Environmental Protection
of the People‘s Republic of China
Technical specification for on-board diagnostic (OBD)
system of compression ignition and gas fuelled
positive ignition engines of vehicles
ISSUED ON. JUNE, 24, 2008
IMPLEMENTED ON. JULY 01, 2008
Issued by. the Ministry of Environmental Protection [PRC]
HJ
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Type approval and application ... 10
5 Technical requirements and test ... 12
6 Access to OBD system information ... 25
7 Production consistency ... 26
8 Extension of type approval ... 27
Annex A (Normative) Materials submitted for type approval ... 28
Annex B (Normative) Type approval test of on-board diagnosis (OBD)
system ... 31
Annex D (Normative) Diagnosis signal ... 43
References and Original Chinese Documents ... 46
Foreword
This Standard is formulated to implement the Environment Protection Law of the People's
Republic of China and the Law of the Prevention and Control of Atmospheric Pollution of the
People's Republic of China, to prevent and control the pollution of motor vehicles'
emission to the environment, and to improve the environmental air quality.
This Standard specifies the technical specification and test method for on-board
diagnostic (OBD) system - compression ignition engines and vehicles with such
engines; and positive ignition engines and vehicles with such engines which are
fuelled by natural gas (NG) or liquid petroleum gas (LPG). This Standard supplements
GB 17691, Limits and measurement methods for exhaust pollutants from compression ignition
and gas fuelled positive ignition engines of vehicles (Ⅲ, Ⅳ, Ⅴ) with respect to the
on-board diagnosis (OBD) system.
For the purpose of this Standard, the modifications of technical contents ADOPT
2005/55/EEC, Directive of the European Union (EU) On the laws of the Member States
relating to the measures to be taken against the emission of gaseous and particulate pollutants
from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants
from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in
vehicles, and its revised directives 2005/78/EC and 2006/51/EC with respect to
on-board diagnosis (OBD) system.
For the purpose of this Standard, the Annexes A, B, C and D are normative.
This Standard is issued for the first time.
This Standard was organized for formulation by the Department of Scientific and
Technical Standard of the Ministry of Environmental Protection of the People‘s
Republic of China.
The chief drafting organizations include China Automotive Technology and Research
Center, Chinese Research Academy of Environmental Sciences, and Jinan Vehicle
Testing Center
This Standard was approved on June 24, 2008 by the Ministry of Environmental
Protection of the People‘s Republic of China.
This Standard shall be effective from July 1 2008.
This Standard shall be interpreted by the Ministry of Environmental Protection of the
People‘s Republic of China.
Technical specification for on-board diagnostic (OBD)
system of compression ignition and gas fuelled positive
ignition engines of vehicles
1 Scope
This Standard specifies the technical specification and test method for on-board
diagnostic (OBD) system - compression ignition engines and vehicles with such
engines; and positive ignition engines and vehicles with such engines which are
fuelled by natural gas (NG) or liquid petroleum gas (LPG).
This Standard applies to the type approval and production consistency inspection for
the OBD system of the compression ignition (including gas fuelled positive ignition)
engines; and the relevant vehicles of classes M2, M3, N1, N2 and N3 which are
designed for speed greater than 25 km/h; and vehicles of class M1 which have total
mass greater than 3500 kg.
For N1 and N2 vehicles fitted with compression ignition (including gas fuelled positive
ignition) engines, if the OBD system type approval has been made in accordance with
GB 18352.3-2005, Limits and measurement methods for emissions from light-duty vehicles
(Ⅲ, Ⅳ). the type approval specified in this Standard may be omitted for their engines.
2 Normative references
The articles contained in the following documents have become part of this Standard
through reference in this Standard. For the undated documents so quoted, the effective
edition shall be applicable to this Standard.
GB 17691 Limits and measurement methods for exhaust pollutants from compression
ignition and gas fuelled positive ignition engines of vehicles (China III IV V Stages)
GB 18352.3-2005 Limits and measurement methods for emissions from light-duty
vehicles (China III IV Stages)
HJ 438-2008, Durability of emission control systems of compression ignition and gas
fuelled positive ignition engines of vehicles
ISO 2575 Road vehicles -- symbols for controls, indicators and tell-tales
ISO 15031-3 Road vehicles -- Communication between vehicle and external
equipment for emissions-related diagnostics -- Part 3. Diagnostic connector and
related electrical circuits, specification and use
ISO 15031-4 Road vehicles -- Communication between vehicle and external
equipment for emissions-related diagnostics -- Part 4. External test equipment
ISO 15031-5 Road vehicles -- Communication between vehicle and external
equipment for emissions-related diagnostics -- Part 5. Emissions-related diagnostic
services
ISO DIS 15031-6.2004 Road vehicles -- Communication between vehicle and
external test equipment for emissions-related diagnostics -- Part 6. Diagnostic trouble
code definitions
ISO 15765-4 Road vehicles -- Diagnostics on Controller Area Networks (CAN) -- Part
4. Requirements for emissions-related systems
SAE J1939 Recommended Practice for a Serial Control and Communications Vehicle
Network
SAE J1939-13 Off-Board Diagnostic Connector
SAE J1939-73 Application Layer -- Diagnostics
SAE J2012 Diagnostic Trouble Code Definitions
3 Terms and definitions
For the purposes of this Standard, the terms and definitions given in GB 17691 and
HJ 438-2008, Durability of emission control systems of compression ignition and gas fuelled
positive ignition engines of vehicles and the following terms and definitions apply.
3.1 Defeat strategy
Any of the below mentioned strategies is considered as the defeat strategy.
A kind of auxiliary emission control strategy (AECS) which enables that, under
reasonable and normal operating conditions, a vehicle has an emission control
efficacy lower than that under the basic emission control strategy (BECS); or
b) The reagent flow or the position where the reagent is injected into the exhaust
after-treatment system, which shall technically ensure to be injected to the required
point as practical as possible.
5.5.4.9 Within the time specified in sub-clause 5.5.4.7, if the difference between the
actual average reagent consumption and theoretical one exceeds 50%, the engine
system shall enable the measure specified in sub-clause 5.5.4.11.
5.5.4.10 In case of interruption of the activated metering reagent feed mechanism, the
measure specified in sub-clause 5.5.4.11 shall be adopted. This measure is not
required for the following circumstances.
If such interruption is as needed for the engine operating conditions and as required
by the engine electronic control unit (e.g. the oper...