Gm Global Technolgoy Operations, Inc.

James M Dixon

John Coppola

Cheryl Jeanette Stark

Michael Christopher Luckham

Scott R Gordon

Jose Deleon

A sensor diagnostic system comprises first, second, and third dosing agent sensors and a control module. The first, second, and third dosing agent sensors indicate whether a dosing agent is present at first, second, and third volumetric levels of a dosing agent tank, respectively. The second volumetric level is greater than the first volumetric level and the third volumetric level is greater than the second volumetric level. The control module selectively diagnoses a sensor fault in at least one of the first, second, and third dosing agent sensors based on the indications of the first, second, and third dosing agent sensors.

Systems and method for monitoring urea level

A control system for an engine system includes a temperature sensor and a diagnostic module. The temperature sensor measures an outlet temperature at an outlet of a cooling system. The diagnostic module estimates the cooling fluid temperature, determines the cooling performance based on the outlet temperature and the cooling fluid temperature, and selectively diagnoses a fault in the cooling system based on the cooling performance and a predetermined threshold.

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Commerce Township, MI, United States of America

James M Dixon