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 input speed is 1000 rpm and the 4th gear ratio is 0.685, then the output speed is 685 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 such as control valve sticking or solenoid valve malfuctioning rather than an electrical issue.
Item
Detecting Condition
Possible cause
DTC Strategy
? 4th gear incorrect ratio
? Faulty Input speed sensor
? Faulty output speed sensor
? Faulty E/C or K/D
F/C - Front Clutch
R/C - Rear Clutch
E/C - End Clutch
OWC - One Way Clutch
K/B - Kicdown brake
L/R - Low & Reverse brake
Enable Conditions
? Engine speed >400rpm
? Output speed(PG-B) >900rpm
? Shift stage 4st. gear
? Input speed(PG-A) >300rpm
? A/T fluid temp sensor voltage >10?(50?)
? TRANSAXLE RANGE SWITCH is normal
? Solenoid is normal
Threshold Value
??input speed/4th gear ratio - output speed ?=200rpm /4th. gear ratio
Diagnostic Time
? More than 2sec
Fail Safe
? Locked into 3 rd gear.(If diagnosis code P0734 is output four times, the transaxle is locked into 3rd gear)