System and method for evaporative emissions detection

Abstract

Methods and systems are provided for conducting an evaporative emissions test on a fuel system in a vehicle. In one example, in response to a determination, based on the prevailing vehicle and ambient thermal conditions, that altering vehicle height may increase pressure or vacuum build during a pressure or vacuum build phase of an engine off natural vacuum test, employing the vehicle's active suspension to make said height adjustments. In this way the accuracy of engine off natural vacuum testing can be improved, and the conditions under which such testing can be efficaciously conducted increased.

Dependencies are inferred from the claim text.