FUEL CELL SYSTEM

A fuel cell system that includes an ejector on a path for introducing hydrogen into a fuel cell stack includes a control device, in which the control device acquires impedance when a current value of the fuel cell stack, a coolant temperature at an outlet of the fuel cell stack, and an atmospheric pressure, are each within a predetermined range, and when the impedance is greater than a predetermined threshold value, determination is made that the ejector is blocked.