Gm Global Technolgoy Operations, Inc.

Vidyapriya Srinivasan

Igor Anilovich

Robert J Genslak

Edward Stuteville

Justin Adams

Jeffry A Helmick

Wesley W Wald

A diagnostic system for an exhaust system including a catalyst and a post-catalyst oxygen sensor is provided. The system generally includes a fuel control module that commands fuel to transition from a rich condition to a lean condition and that commands fuel to transition from the lean condition to the rich condition. A first diagnostic module monitors the post-catalyst oxygen sensor during the transition from the rich condition to the lean condition. A second diagnostic module monitors the catalyst during the transition from the lean condition to the rich condition.

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South Lyon, MI, United States of America

Vidyapriya Srinivasan