Heavy duty vehicles (greater than 14,000 lb ) made after 2010, for sale in the US are allowed to support OBD-II diagnostics through SAE standard J1939-13 (a round diagnostic connector) according to CARB in title. They are both required to be accessed through a standardized data link connector defined by SAE J1962. In 1996, light duty vehicles (less than 8,500 lb ) were the first to be mandated followed by medium duty vehicles (between 8,500–14,000 lb ) in 2005. Though not mandated, many motorcycles also support OBD-II PIDs. Manufacturers also define additional PIDs specific to their vehicles. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections. SAE standard J1979 defines many OBD-II PIDs. OBD-II PIDs ( On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool.
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