DTC P0731 Gear 1 Incorrect Ratio: DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition & Fail Safe	Possible cause
DTC Strategy	1st gear incorrect ratio	Faulty Input speed sensor Faulty output speed sensor Faulty UD clutch or LR brake or Oneway clutch
Enable Conditions	Engine speed > 450 RPM Output speed > 350 RPM Shift stage 1st. gear Input speed > 0 RPM A/T oil temp sensor voltage 4.5V Voltage of Battery > 10V TRANSAXLE RANGE SWITCH is normal
Threshold value	\| Input speed/1 st gear ratio - output speed \| ≥ 200 RPM/1st. gear ratio
Diagnostic Time	more than 1 SEC
Fail Safe	Locked into 3 rd gear. (If diagnosis code P0731 is output four times, the transaxle is locked into 3rd gear)