P0734

DTC P0734 GEAR 4 INCORRECT RATIO

COMPONENT LOCATION:

GENERAL DESCRIPTION
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.

DTC DESCRIPTION
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 malfunctioning rather than an electrical issue.

DTC DETECTING CONDITION:

SCHEMATIC DIAGRAM
Refer to DTC P0731. P0731

SIGNAL WAVEFORM
Refer to DTC P0731. P0731

MONITOR SCANTOOL DATA
^ It is difficult to "STALL TEST" in 4th gear, therefore Go to "W/Harness inspection" procedure.

OPERATING ELEMENT OF EACH SHIFTING RANGE:

SIGNAL CIRCUIT INSPECTION
1. Connect Scantool.
2. Engine "ON".
3. Monitor the "INPUT & OUTPUT SPEED SENSOR" parameter on the Scantool.
4. Accelerate the engine speed until about 2000 rpm in the 4th gear while driving the vehicle on a level road.
Specification: INPUT SPEED - (OUTPUT SPEED x GEAR RATIO) @ 200 RPM





5. Are "INPUT & OUTPUT SPEED SENSOR" within specifications?
YES
^ Go to "Component inspection" procedure.

NO
^ Check for electrical noise of circuit in INPUT & OUTPUT SPEED SENSOR or Replace INPUT & OUTPUT SPEED SENSOR. Repair as necessary and go to "Verification of vehicle repair" procedure.

COMPONENT INSPECTION:

1. Connect oil pressure gauge to "E/C" and "K/D" port.
2. Engine "ON".
3. Drive a car at gear position "4" in "D RANGE".
4. Compare actual value to specifications.
Specification: Shown below





^ The values are subject to change according to vehicle model or condition

5. Is oil pressure value within specifications?

YES
^ Repair AUTO TRANSAXLE(Clutch or brake) as necessary and go to "Verification of vehicle repair" procedure.

NO
^ Replace AUTO TRANSAXLE (BODY CONTROL VALVE faulty) as necessary and go to "Verification of vehicle repair" procedure.

VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0731. P0731