- 1988: SAE set a standard connector plug and set of diagnostic test signals. The EPA ( Environmental Protection Agency) adapted most of their standards from the SAE on-board diagnostic programs and recommendations.
- 1996: OBD-II (an expanded set of standards and practices developed by SAE) was adopted by the EPA and CARB (California Air Resources Board) for implementation.
Standards
OBD-II is a set of specifications and services based on the ISO 15031. OBD-II consists of so many different standards, protocols and bus systems used to communicate that it's difficult to list all of them.
- ISO 15031: protocol for communication between a vehicle (through the OBD port/connector) and an external diagnostic equipment for emissions related diagnostics.
- SAE J1939-13: round diagnostic connector may support OBD-II data on heavy duty vehicles for sales in the USA after 2010.
Here are some of the common part numbers in the HD10 series now by TE Connectivity (formerly:- HD10-9-1939P: receptacle flange
- HD14-9-1939P: receptacle inline
- HD16-9-1939S: plug
- HD17...:
no bayonet ring
- SAE J1962: hardware interface (connector, female = receptacle, 16-pin (2x8), D-shaped)
- type A: 12 V vehicles (full middle groove)
- type B: 24 V vehicles (interrupted middle groove)
- common with passenger cars (11 bit headers)
- used by some heavy duty trucks in North America (29 bit CAN identifiers)
- SAE J1979: defines many OBD-II PID's.
Glossary
- DLC = data link connector = OBD-II port
- DTC = diagnostic trouble codes
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