CVT RE0F10A Torque Converter

P0744 TORQUE CONVERTER

Description

This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or shorted), but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If "DTC CONFIRMATION PROCEDURE" has been previously performed, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.

1. CHECK DTC DETECTION

With CONSULT
1.Turn ignition switch ON.
2.Select "DATA MONITOR".
3.Start engine and maintain the following condition for at least 30 seconds.





With GST
Follow the procedure "With CONSULT".
Is "P0744" detected?
YES- Go to "Diagnosis Procedure".
NO- Check intermittent incident. Intermittent Incident.


Diagnosis Procedure


1. CHECK LINE PRESSURE

Perform line pressure test. CVT RE0F10A.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace damaged parts.

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check torque converter clutch solenoid valve. CVT RE0F10A Torque Converter.
Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 6.

3. CHECK LOCK-UP SELECT SOLENOID VALVE

Check lock-up select solenoid valve. CVT RE0F10A Select Solenoid.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace damaged parts.

4. CHECK SECONDARY SPEED SENSOR SYSTEM

Check secondary speed sensor system. CVT RE0F10A Output Speed Sensor.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace damaged parts.


5. CHECK PRIMARY SPEED SENSOR SYSTEM

Check primary speed sensor system. CVT RE0F10A Input Speed Sensor A.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace damaged parts.

6. CHECK DTC (TCM)

With CONSULT
1.Perform "DTC CONFIRMATION PROCEDURE". Refer to "DTC Logic".
2.Perform "SELF-DIAG RESULTS" mode for "TRANSMISSION".
Is only "P0744" detected?
YES-1 ("P0744" only)-There is a malfunction of the torque converter clutch solenoid valve. Replace the control valve. Removal And Installation.
YES-2 ("P0744" and other DTC)-Replace the transaxle assembly. Removal And Installation.
NO- Check intermittent incident. Intermittent Incident.