Fault diagnosis system and fault diagnosis method of the fuel level sensor in the fuel level sensor

摘要

A trouble diagnosis device for the fuel level sensor for detecting a fuel remaining amount in the fuel tank and a at least a first tank second tank, based on the output value of the fuel level sensor, a fuel level sensor output a region determining means for determining a region of the fuel remaining amount is divided according to the characteristics, the fuel consumption from the area is changed, by comparing the failure determination threshold set separately for each region, region and a region fault diagnosis means for performing a failure diagnosis of the fuel level sensor for each region fault diagnosis means, the output value of the fuel level sensor when the fuel consumption target is switched to the second tank from the first tank changes in the less become the dead zone, the failure determination threshold value, the value of fuel consumption equivalent necessary to exit the dead zone area.