Gm Global Technolgoy Operations, Inc.

Christopher J Dobies

Andrew M Zettel

John F Van Gilder

Rick H Schroeder

Michael J Taljonick

A diagnostic system for a vehicle includes a first sensor that generates a first status signal, which is indicative of an engine speed of an engine. A second sensor generates a second status signal that is indicative of an actual accessory speed of an accessory. The accessory is coupled to the engine via a belt system. A control module determines an expected accessory speed based on the engine speed and determines a residual accessory speed based on the expected and actual accessory speeds. The control module also detects a fault in the belt system based on the residual accessory speed.

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Beverly Hills, MI, United States of America

Christopher J Dobies