Patent ID: 11935340
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. The system of claim 18, wherein the diagnostic routine includes:
coupling the fuel system to the evaporative emissions system by commanding open a fuel tank isolation valve;
sealing the fuel system and evaporative emissions system from atmosphere by commanding a changeover valve of an onboard pump positioned in a vent line between the fuel vapor storage canister and atmosphere to a second position;
commanding closed a canister purge valve positioned in a purge line downstream of the fuel vapor storage canister;
monitoring pressure in the fuel system and evaporative emissions system; and
indicating the fuel system and evaporative emissions system are free from undesired evaporative emissions responsive to pressure in the fuel system and evaporative emissions system remaining below a predetermined threshold pressure for a predetermined duration.