To determine an abnormal hydraulic control means and perform abnormality determination in an automatic transmission having a plurality of hydraulic control means with differences in pressure outputted during abnormality.
An ECU determines whether or not an input torque Ttransmit inputted to a clutch and a brake immediately before a slip occurs is a predetermined value T2 or more (S50), and when the input torque Ttransmit is the predetermined value T2 or more, the ECU determines that a line pressure controlling mechanism is abnormal (S60). When the input torque Ttransmit is less than the predetermined value T2, the ECU determines that an operation switching mechanism is abnormal (S70). As a result, the mechanism that is abnormal can be determined.
KAIGAWA MASAHITO
KOBAYASHI KIYOSHI
Makoto Onda