J2744_202003: Requirements for Built-in Service Port for On-Board Diagnostics

Features

Issuing Committee: Fuel Systems Standards Committee

Scope

Content

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

Rationale

Content: No change expected or needed in this technology.

Meta Tags

Topics: Evaporative emissions control systems (EVAP)
On-board diagnostics (OBD)
Heavy trucks
Pressure
Environmental regulations and standards

Details

DOI: https://doi.org/10.4271/J2744_202003

Pages: 9

Citation: SAE International Recommended Practice, Requirements for Built-in Service Port for On-Board Diagnostics, SAE Standard J2744_202003, Stabilized March 2020, Issued August 2008, https://doi.org/10.4271/J2744_202003.

Additional Details