Description / Abstract:
This document presents the requirements for a built-in service
port to be used in vehicles intended to comply with Enhanced
Evaporative Emissions Requirements. The primary function of the
Service Port (Valve Assembly-Evaporative Emission Canister Purge
Harness Service) is to provide non-destructive access to the
evaporative emissions system to enable testing of the integrity of
the system. The Service Port is used to introduce air pressure or
fuel vapors into, or evacuates them out of, the system. This access
may be used for the following evaluations:
• Evaporative System Certifications Canister Loading and
Purging
• End-of-line Testing System Integrity
• Service (e.g. OBD MIL on) Leak Location and Repair
Verification
• In-Use Compliance Testing Canister Loading and
Purging
• Inspection/Maintenance Testing System Integrity and
Purge Check
Mission/Theme
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.
Classification
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.