This standard supplements the technical requirements about on-board diagnostic system (OBD) stated in GB 18352.3-2005, and proposes technical requirements for management in such aspects as type approval, production conformity inspection, in-use vehicle inspection and universal trouble diagnosis instrument of OBD system.
This standard is applicable to the light duty vehicles powered by spark ignition engine or compression ignition engine and with the maximum design speed larger than or equal to 50km/h. The heavy duty vehicles powered by spark ignition engine and with the maximum design speed larger than or equal to 25km/h may refer to this standard.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For undated references, the effective edition is applicable to this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, it is encouraged to apply the most recent editions of the following ISO standards.
GB 18285-2005 Limits and Measurement Methods for Exhaust Pollutants from Vehicles Equipped Ignition Engine under Two-speed Idle Conditions and Simple Driving Mode Conditions
GB 18352.3-2005 Limits and Measurement Methods for Emissions from Light-duty Vehicles
GB/T 15089-2001 Classification of Power-driven Vehicles and Trailers
GB/T 19755 Measurement Methods for Emissions from Light-duty Hybrid Electric Vehicles
ISO 2575 Road Vehicles - Symbols for Controls, Indicators and Tell-tales
ISO 9141-2:1996 Road Vehicles - Diagnostic Systems - Part 2: CARB Requirements for Interchange of Digital Information
ISO 14230-4 Road Vehicles - Diagnostic systems - Keyword Protocol 2000 - Part 4: Requirements for Emission Related Systems
ISO DIS 15031-3:2001 Road Vehicles - Communication between Vehicle and External Test Equipment for Emissions-related Diagnostics - Part 3: Diagnostic Connector and Related Electrical Circuits: Specification and Use
ISO DIS 15031-4:2001 Road Vehicles - Communication between Vehicle and External Equipment for Emissions-related Diagnostics - Part 4: External Test Equipment
ISO DIS 15031-5:2001 Road Vehicles - Communication between Vehicle and External Equipment for Emissions-related Diagnostics - Part 5: Emissions-related Diagnostic Services
ISO DIS 15031-6:2001 Road Vehicles - Communication between Vehicle and External Equipment for Emissions-related Diagnostics - Part 6: Diagnostic Trouble Code Definitions
ISO DIS 15765-4:2001 Road Vehicles - Diagnostics on Controller Area Network (CAN) - Part 4: Requirements for Emissions-related Systems
SAE J1850:1998 Class B Data Communications Network Interface
3 Terminologies and Definitions
For the purposes of this standard, the relevant terminologies and definitions established in GB 18352.3-2005 apply.
3.1 Light duty vehicles
Categories M1, M2 and N1 motor vehicles specified in GBFF 15089-2001, with the maximum total mass less than or equal to 3,500kg.
3.2 On-board diagnostic system (OBD)
On-board diagnostic system (OBD) used for emission control, which must possess the function of distinguishing the area with possible troubles and storing this information in the memory of electronic control unit in the form of trouble code
