| 摘要 |
An automatic transmission comprising a controlling unit 5 for driving and controlling an actuator 3 until a rotation position, which is detected by a potentiometer 13 in response to the receipt of an instruction signal from an operation switch portion 17, accords with the instructed shifting position. The transmission includes a self-diagnosis unit 9 for diagnosing a trouble after driving the actuator 3 to the position over the instructed shifting position for a predetermined amount on the basis of the first instruction signal by the operation switch portion 17 at a starting time of driving an automobile and after driving the actuator 3 in reverse to the instructed shifting position, as well as driving the actuator 3 by varying high or low the duty ratio in driving and controlling the actuator 3, in accordance with the judgment whether or not an output signal of the potentiometer 13 corresponds to such driving.
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