Ford Global Technolgoies, LLC

Samuel McClure

Michiel Jacques Van Nieuwstadt

In Kwang Yoo

Bret Alan Zimmerman

Methods and systems are provided for waking up a powertrain control module of an engine-driven vehicle during engine soak to perform an offset test of an exhaust NOx sensor. In one example, a method includes determining a duration to delay waking up the powertrain control module based on exhaust temperature at vehicle-off, waking up the powertrain control module after the duration has expired, and then initiating heating of the NOx sensor. After the NOx sensor lights off, heating continues for an additional duration before offset testing of the NOx sensor is performed.

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Canton, MI, United States of America

Samuel McClure