Editing On-board diagnostics (section)

==Standards documents==

===SAE standards documents on OBD-II===
*J1962 – Defines the physical connector used for the OBD-II interface.
*J1850 – Defines a serial data protocol. There are 2 variants: 10.4&nbsp;kbit/s (single wire, VPW) and 41.6&nbsp;kbit/s (2 wire, PWM). Mainly used by US manufacturers, also known as PCI (Chrysler, 10.4K), Class 2 (GM, 10.4K), and SCP (Ford, 41.6K)
*J1978 – Defines minimal operating standards for OBD-II scan tools
*J1979 – Defines standards for diagnostic test modes
*J2012 – Defines standards trouble codes and definitions.
*J2178-1 – Defines standards for network message header formats and physical address assignments
*J2178-2 – Gives data parameter definitions
*J2178-3 – Defines standards for network message frame IDs for single byte headers
*J2178-4 – Defines standards for network messages with three byte headers
*J2284-3 – Defines 500K [[Controller area network|CAN]] [[Physical layer|physical]] and [[data link layer]]
*J2411 – Describes the [[General Motors Local Area Network|GMLAN]] (Single-Wire CAN) protocol, used in newer GM vehicles. Often accessible on the OBD connector as PIN 1 on newer GM vehicles

===SAE standards documents on HD (Heavy Duty) OBD===
*[[J1939]] – Defines a data protocol for heavy duty commercial vehicles

===ISO standards===
*ISO 9141: Road vehicles – Diagnostic systems. [[International Organization for Standardization]], 1989.
**Part 1: Requirements for interchange of digital information
**Part 2: CARB requirements for interchange of digital information
**Part 3: Verification of the communication between vehicle and OBD II scan tool
*ISO 11898: Road vehicles – Controller area network (CAN). International Organization for Standardization, 2003.
**Part 1: Data link layer and physical signalling
**Part 2: High-speed medium access unit
**Part 3: Low-speed, fault-tolerant, medium-dependent interface
**Part 4: Time-triggered communication
*ISO 14230: Road vehicles – Diagnostic systems – Keyword Protocol 2000, International Organization for Standardization, 1999.
**Part 1: Physical layer
**Part 2: Data link layer
**Part 3: Application layer
**Part 4: Requirements for emission-related systems
*ISO 15031: Communication between vehicle and external equipment for emissions-related diagnostics, International Organization for Standardization, 2010.
**Part 1: General information and use case definition
**Part 2: Guidance on terms, definitions, abbreviations and acronyms
**Part 3: Diagnostic connector and related electrical circuits, specification and use
**Part 4: External test equipment
**Part 5: Emissions-related diagnostic services
**Part 6: Diagnostic trouble code definitions
**Part 7: Data link security
*ISO 15765: Road vehicles – Diagnostics on Controller Area Networks (CAN). International Organization for Standardization, 2004.
**Part 1: General information
**Part 2: Network layer services [[ISO 15765-2]]
**Part 3: Implementation of unified diagnostic services ([[Unified Diagnostic Services|UDS]] on CAN)
**Part 4: Requirements for emissions-related systems