Evaporative emissions system check valve monitor for GTDI engines

摘要

Methods and systems are provided for conducting a dual test monitor for the presence or absence of undesired evaporative emissions in a vehicle fuel system and evaporative emissions control system. In one example, the dual test monitor includes conducting an evaporative emissions test diagnostic procedure during both boosted and non-boosted conditions during a single drive cycle. In this way, results from the test diagnostic procedure conducted under boost conditions may be compared to the results of the test diagnostic procedure under non-boosted conditions, to unambiguously diagnose functionality of a plurality of components in the fuel system and evaporative emissions system, which may thus reduce undesired evaporative emissions.