P0733
DTC P0733 GEAR 3 INCORRECT RATIOCOMPONENT 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 3rd gear ratio, while the transaxle is engaged in the 3rd gear. For example, if the output speed is 1,000 rpm and the 3rd gear ratio is 1.000, then the input speed is 1,000 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 3rd gear ratio, while the transaxle is engaged in 3rd 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
DTC DETECTING CONDITION:
SCHEMATIC DIAGRAM
Refer to DTC P0731. P0731
SIGNAL WAVEFORM
Refer to DTC P0731. P0731
MONITOR SCAN TOOL DATA
1. Connect SCAN TOOL to data link connector (DLC).
2. Engine ON.
3. Monitor the ENGINE SPEED, INPUT SPEED SENSOR, OUTPUT SPEED SENSOR, GEAR POSITION parameter on the SCAN TOOL.
4. Disconnect the solenoid valve connector and perform the STALL TEST.
Specification: 2100 - 2900 engine rpm
Specification:
OPERATING ELEMENT OF EACH SHIFTING RANGE
OPERATING ELEMENT OF EACH SHIFTING RANGE:
Stall test procedure in D3 and reason
Procedure
1. Warm up the engine
2. Set 3rd gear hold by disconnecting the solenoid valve connector. Fully depress the brake pedal, then place the transaxle gear lever into D range. Press and hold the accelerator pedal to the floor for no more than eight seconds while observing the engine, input speed, and output speed RPM values.
- The slippage of 3rd gear operating parts can be detected by stall test in D3.
Reason for stall test
1. If there is no mechanical defaults in A/T all slippage occurs in torque converter.
2. Therefore, engine revolution is output, but input and output speed revolution must be zero due to wheel's lock.
3. If OD clutch system (3rd gear operating part) has faults, input speed revolution will be out of specification.
4. If output speed revolution is output. It means that the foot brake force is not applied fully. Retesting using greater braking force is required.
5. Is STALL TEST within specification?
YES > Go to Signal Circuit Inspection procedure.
NO > Go to Component Inspection procedure.
CAUTION:
- Do not let anybody stand in front of or behind the vehicle while this test is being carried out.
- Check the A/T fluid level and temperature and the engine coolant temperature.
- Fluid level: At the hot mark on the oil level gauge.
- Fluid temperature: 80 - 100°C (176°F - 212°F).
- Engine coolant temperature: 80 - 100°C (176°F - 212°F).
- Chock both rear wheels (left and right).
- Pull the parking brake lever on with the brake pedal fully depressed.
- The throttle should not be left fully open for more than eight seconds.
- If carrying out the stall test two or more times, move the select lever to the N position and run the engine at 1,000 rpm to let the A/T fluid cool down before carrying out subsequent tests.
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 3rd gear.
Specification: INPUT SPEED - (OUTPUT SPEED x GEAR RATIO): 200 RPM
Specification:
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
COMPONENT INSPECTION:
1. Connect Oil pressure gauge to UD and OD port.
2. Engine ON.
3. Drive the car with gear position 3.
4. Compare it with reference data.
Specification
Specification:
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