DTC P0731 Gear 1 Incorrect Ratio: General Description
The value of the input shaft speed should be equal to the value of the output shaft speed, when multiplied by the 1st gear ratio, while the transaxle is engaged in the 1st gear. For example, if the output speed is 1000 RPM and the 1st gear ratio is 4.497, then the input speed is 4,497 RPM.