http://en.wikipedia.org/wiki/On-board_diagnostics#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 kbit/s (single wire, VPW) and 41.6 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 CAN Physical and Data Link Layer
- J2411 - Describes the 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[edit]
- 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 14320 no data
- 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 (UDS on CAN)
- Part 4: Requirements for emissions-related systems
- 0 – Automatic
- 1 – SAE J1850 PWM (41.6 kbaud)
- 2 – SAE J1850 VPW (10.4 kbaud)
- 3 – ISO 9141-2 (5 baud init, 10.4 kbaud)
- 4 – ISO 14230-4 KWP (5 baud init, 10.4 kbaud)
- 5 – ISO 14230-4 KWP (fast init, 10.4 kbaud)
- 6 – ISO 15765-4 CAN (11 bit ID, 500 kbaud)
- 7 – ISO 15765-4 CAN (29 bit ID, 500 kbaud)
- 8 – ISO 15765-4 CAN (11 bit ID, 250 kbaud)
- 9 – ISO 15765-4 CAN (29 bit ID, 250 kbaud)
- A – SAE J1939 CAN (29 bit ID, 250 kbaud)