| 摘要 |
A plurality of capacitance values at different obtained fuel temperatures are obtained. Ethanol concentrations of fuel to be measured are obtained from these capacitance values after correcting for an amount of change in the capacitance values due to a temperature characteristic. The correction according to the temperature characteristic is realized according to a map stored in a control apparatus. It is determined that there is an abnormality in an alcohol concentration sensor if the difference among the obtained ethanol concentrations is equal to or greater than a predetermined value.
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