SAE J1979/ISO 15031-5 set includes the communication between the vehicle's OBD systems and test equipment implemented across vehicles within the scope of the legislated emissions-related OBD.
J1979 needs to be updated to add ISO 14229 services. CARB will allow this update for the next Light Duty rulemaking. This will be done by creating a J1979-2 document. Legacy protocols will be removed to ease document maintenance.