processo, e, dispositivo para diagnosticar o estado de funcionamento de um sistema de alimentação de combustível de um motor de combustão interna de veículo automotivo.

摘要

The invention relates to a method for diagnosing the operational state of a fuel supply system of an automobile internal combustion engine, said fuel being stored in a tank of the vehicle and having a variable alcohol content, wherein said method includes a step of diagnosing (S6) the operational state of the fuel supply system, a step of detecting the addition of alcohol into the tank (S2), a step of determining the alcohol content (S2bis) in the fuel, and a checking step (S4) in which the diagnosis step (S6) is triggered if the step of determining the alcohol content (S2bis) in the fuel is completed.