COMPONENT LOCATION

Refer to DTC P0731

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.

DTC DETECTING CONDITION

Item

Detecting Condition & Fail Safe

Possible cause

DTC Strategy

● 3rd gear incorrect ratio

● Faulty Input speed sensor

● Faulty output speed sensor

● Faulty UD clutch or OD brake

Enable Conditions

● Engine speed ＞450rpm

● Output speed ＞900rpm

● Shift stage 3rd. 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/3rd gear ratio - output speed ㅣ≥200rpm /3rd. gear ratio

Diagnostic Time

● more than 1sec

Fail Safe

● Locked into 3 rd gear.(If diagnosis code P0733 is output four times, the transaxle is locked into 3rd gear)

MONITOR SCANTOOL DATA
1.

Connect scantool to data link connector(DLC)

2.

Engine "ON".

3.

Monitor the "ENGINE SPEED, INPUT SPEED SENSOR, OUTPUT SPEED SENSOR, GEAR POSITION" parameter on the scantool

4.

Disconnect the solenoide valve connector and perform the "STALL TEST"

5.

Compare it with referance data as below

Specification : 2000~2700 engine rpm

OPERATING ELEMENT OF EACH SHIFTING RANGE

Refer to DTC P0731

Stall test procedure in D3 and reason

Procedure

A.

Warm up the engine

B.

After making 3rd gear hold by disconnecting the solenoid connector, and Then depress the foot brake pedal fully After that, step on the accelerator pedal to the maximum

＊ The slippage of 3rd gear operating parts can be detected by stall test in D3.

Reason for stall test

A.

If there is no mechanical defaults in A/T, every slippage occur in torque converter.

B.

Therfore, engine revolution is output, but input and output speed revolution must be "zero" due to wheel's lock.

C.

If OD clutch system(3rd gear operating part) has faults, input speed revolution will be output.

D.

If output speed revolution is output. It means that the foot brake force is not applied fully. Remeasuring is required.

Does "STALL TEST " within specification?

▶ Go to "W/Harness Inspection" procedure

▶ 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 : 176 °F~ 212 °F (80~100 °C).

-

Engine coolant temperature : 176 °F~ 212 °F (80~100 °C).

● Chock both rear wheel(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 second.

● If carrying out the stall test two or more time, 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.

SIGNAL CIRCUIT INSPECTION
1.

Connect Scantool

2.

Engine "ON" .

3.

Monitor signal waveform of the "INPUT & OUTPUT SPEED SENSOR" after shifting to D3 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

COMPONENT INSPECTION
1.

Connect Oil pressure guage to "UD" and "OD" port.

2.

Engine "ON".

3.

Disconnect the solenoide valve connector

4.

Drive a car with gear position 3 in fail mode

5.

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.

VERIFICATION OF VEHICLE REPAIR

Refer to DTC P0731

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