P0734

DTC P0734 GEAR 4 INCORRECT RATIO

COMPONENT LOCATION:

GENERAL DESCRIPTION
The input shaft speed in gear 4 range should be the similar to the value that is what the gear 4 ratio and the output shaft speed are multiplied. For example, if the output shaft speed is 1,000 rpm and the gear 4 ratio is 1.034, the input shaft speed may be about 1,034rpm.

DTC DESCRIPTION
This code is displayed if the input shaft speed does not conform with the value which is what the output shaft speed and the gear 4 ratio are multiplied. This is most likely caused by a mechanical defect of adherence of control valves or a breakdown of solenoid controlled valves etc. than an electrical defect.

DTC DETECTING CONDITION

DTC DETECTING CONDITION:

SIGNAL WAVEFORM

SIGNAL WAVEFORM:

MONITOR SCAN TOOL DATA
It is difficult to STALL TEST in 4th gear, therefore Go to W/Harness Inspection procedure.

OPERATING ELEMENT OF EACH SHIFTING RANGE

OPERATING ELEMENT OF EACH SHIFTING RANGE:

UD/C Underdrive clutch
OD/C Overdrive clutch
2ND/B:2ND brake
LR/B: Low & Reverse brake
REV/C: Reverse clutch
RED/B: Reduction brake
DIR/C: Direct clutch
OWC: One way clutch for sub gear shifting
OWC1: One way clutch for main gear shifting

SIGNAL CIRCUIT INSPECTION
1. Connect scan tool.
2. Engine ON.
3. Monitor the INPUT & OUTPUT SPEED SENSOR parameter on the SCAN TOOL.
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

Specification:

5. Does 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

COMPONENT INSPECTION:

1. Connect oil pressure gauge to UD and OD ports.
2. Engine ON.
3. Drive a car with gear position 4.
4. Compare it with reference data.
Specification

Specification (Part 1):

Specification (Part 2):

Specification (Part 3):

Specification (Part 4):

Specification (Part 5):

5. Is oil pressure value within specification?
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