Editing On-board diagnostics (section)

===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