DTC P0731 Gear 1 Incorrect Ratio: DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition	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 > -23.5°C (-10.3°F) Voltage of Battery > 10V TRANSAXLE RANGE SWITCH is normal and after 2sec is passed from IG ON
Threshold value	\| Input speed/1st gear ratio - output speed \| ≥200 RPM
Diagnostic Time	More than 1sec
Fail Safe	Locked into 3rd gear. (If diagnosis code P0731 is output four times, the transaxle is locked into 3rd gear)