Refer to DTC P0731
The value of the input shaft speed should be equal to the value of the output shaft speed, when multiplied by the 4th gear ratio, while the transaxle is engaged in the 4th gear. For example, if the output speed is 1,000 rpm and the 4th gear ratio is 0.712, then the input speed is 712 rpm.
This code is set if the value of input shaft speed is not equal to the value of the output shaft, when multiplied by the 4th gear ratio, while the transaxle is engaged in 4th gear. This malfunction is mainly caused by mechanical troubles.
Item | Detecting Condition & Fail Safe | Possible cause |
DTC Strategy | ● 4th gear incorrect ratio | ● Faulty Input speed sensor ● Faulty output speed sensor ● Faulty UD clutch or 2nd brake |
Enable Conditions | ● Engine speed ＞450rpm ● Output speed ＞900rpm ● Shift stage 4th. gear ● Input speed ＞0rpm ● A/T oil temp sensor voltage ＜4.5V ● Voltage of Battery ＞10V ● TRANSAXLE RANGE SWITCH is normal | |
Threshold value | ●ㅣinput speed/4th gear ratio - output speed ㅣ≥200rpm /4th. gear ratio | |
Diagnostic Time | ● more than 1sec | |
Fail Safe | ● Locked into 3 rd gear.(If diagnosis code P0734 is output four times, the transaxle is locked into 3rd gear) |
※ It is difficult to "STALL TEST" in 4th gear, so that Go to "W/Harness Inspection" procedure
Refer to DTC P0731
Connect Scantool
Engine "ON" .
Monitor signal waveform of the "INPUT & OUTPUT SPEED SENSOR" after shifting to D4 range
Does "INPUT & OUTPUT SPEED SENSOR" follow the referance data?
▶ Go to "Component Inspection" procedure
▶ Check for electrical niose of circuit in INPUT & OUTPUT SPEED SENSOR or Replace INPUT & OUTPUT SPEED SENSOR. Repair as necessary and Go to "Verification Vehicle Repair" procedure
Connect Oil pressure guage to "OD" and "2nd" port.
Engine "ON".
Drive a car with gear position "4 "
Compare it with referance data as below
Specification : Refer to DTC P0731
Is oil pressure value within specification?
▶ Repair AUTO TRANSAXLE(Clutch or Brake) as necessary and Go to "Verification Vehicle Repair" procedure.
▶ Replace AUTO TRANSAXLE (BODY CONTROL VALVE faulty) as necessary and Go to "Verification Vehicle Repair " procedure.
Refer to DTC P0731
