Abnormality determination apparatus and abnormality determination method for oil temperature sensor

摘要

Until the accuracy in calculation of an estimated oil temperature value which is calculated by means of a heat dissipation amount map reaches a predetermined level (NO in S100), an ECU determines, when a transmission oil temperature well exceeds a predetermined temperature after the engine start (YES in S200 and YES in S202 and YES in S204), whether or not an oil temperature sensor fails (S208, S210, S212). When it is determined that the oil temperature sensor is normal, the ECU uses the detected oil temperature value to learn about the heat dissipation map (S214). When the accuracy in calculation of the estimated oil temperature value reaches the predetermined level through the learning about the heat dissipation amount map (YES in S 100), the ECU determines whether or not the oil temperature sensor fails based on the divergence of the detected oil temperature value relative to the estimated oil temperature value (S300-S308).