DTC P0731 Gear 1 Incorrect Ratio: DTC Detecting Condition

DTC CHART

Item	Detecting Condition	Possible cause
DTC Strategy	1st gear incorrect ratio	Faulty Input speed sensor Faulty output speed sensor Faulty UD clutch or LR, RED brake or One way clutch 1,2
Enable Conditions	Engine speed > 450rpm Output speed > 150rpm Shift stage 1st. gear Input speed > Orpm A/T oil temp output ≥ -23°C (-9.4°F) 11V ≤ Battery Voltage ≤ 16V TRANSAXLE RANGE SWITCH is normal and after 2sec is passed from IG ON
Threshold value	\| input speed/1st gear ratio - output speed \| ≥200rpm
Diagnostic Time	more than 1sec
Fail Safe	Locked into 3 rd gear. (If diagnosis code P0731 is output four times, the transaxle is locked into 3rd gear)