SAE J2744:2020 pdf free

SAE J2744:2020 pdf free.Requirements for Built-in Service Port for On-Board Diagnostics
The Service Port is a component of the Evaporative Emissions Subsystem. It shall be an integral part of the Enhanced Evaporative Emission Subsystem and therefore all requirements of that system must be met.
The primary application of this service port will be passenger cars, and light, medium and heavy duty trucks that are required to have OBD II systems and meet Enhanced Evaporative Emissions Standards. This includes gasoline vehicles, and bi-fuel (gasoline/CNG) vehicles intended for sale in the United States and Canada or other marketplaces that adopt Enhanced Evaporative Emission Regulations similar to those in the United States and Canada.
The Service Port is a two-way, normally closed valve, which is integral to the evaporative emission system. The Service Port has a special universal ftting which mates to a regulated pressure source. The pressure source is capable of providing a limited amount of air pressure (or some other medium, depending on specific usage of the Service Port, e.g. certification,service, etc.) into the system. The Service Port has design features to reduce the risk of inadvertently applying system pressure levels, which could violate the integrity of the evaporative system.The Maximum desired pressure for testing the integrity of the evaporative system is 3.5 kPa (14.0 inches of water).
The primary function of this service port will be passenger cars and light, medium and heavy duty trucks that are required to have OBD II systems and meet Enhanced Evaporative Emissions Standards. This includes gasoline vehicles and bi-fuel (gasoline/CNG) vehicles intended for sale in the United States and Canada or other marketplaces that adopt Enhanced Evaporative Emission Regulations similar to those in the United States and Canada.
The Service Port assembly shall be replaced if it becomes inoperable for any reason. No repair is possible. In the case of a design, that incorporates a serviceable valve core assembly, the assembly must meet the physical attributes and all other applicable requirements as stated in this document.SAE J2744 pdf free download.