Colorado State University
National Center for Vehicle Emissions Control and Safety
presents Training Sessions

1 1/2-Day In-Field Catalytic Converter Functional Testing Seminar

Audience: This technical course is designed for automotive in-service trainers, I/M administrators, I/M referee staff, National train-the-trainer staff, repair technicians, and centralized contractor personnel.




Catalyst Theory


Intrusive Concentration Test
Constuction 2/3 way


Efficiency caculation
Function/operation


Necessary Equipment
4-5 gas readings


Laboratory demonstration
Temperature Gradient or
Deta T Test


Predicting Functional and Non-Functional Converters
Using Grams/Mile Tailpipe Readings
Theory of Test


The value of air/fuel ratio
Necessary Equipment


Calculating engine-out CO based on vehicle inertia weight
Laboratory Demonstration


Passing/failing the converter based on tailpipe HC, CO,
and NOx "mass" readings (NCVECS exclusive method)

Copyright © 1995 to Present Colorado State University

Rev. January 31, 2005

HMC