P0744

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.

1. PREPARATION BEFORE WORK

If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.
- GO TO 2.

2. CHECK DTC DETECTION

With CONSULT
1.Start the engine.
2.Select "Data Monitor" in "TRANSMISSION".
3.Select "RANGE", "ATF TEMP SEN", "ACC PEDAL OPEN" and "VEHICLE SPEED".
4.Drive the vehicle.
5.Maintain the following condition for 30 seconds or more.





6.Stop the vehicle.
7.Select "Self Diagnostic Results" in "TRANSMISSION".
With GST
Follow the procedure "With CONSULT".
Is "P0744" detected?
YES- Go to .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK LINE PRESSURE

Perform line pressure test. Refer toLine Pressure Test.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace damaged parts. Line Pressure Test.

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check torque converter clutch solenoid valve. P0740.
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. P1740.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace damaged parts.

4. CHECK PRIMARY SPEED SENSOR SYSTEM

Check primary speed sensor system. P0715.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace damaged parts.

5. CHECK SECONDARY SPEED SENSOR SYSTEM

Check secondary speed sensor system. P0720.
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". .
2.Select "Self Diagnostic Results" in "TRANSMISSION".
Is "P0744" detected?
YES-1 (Only "P0744" is detected)-There is a malfunction of the torque converter clutch solenoid valve.
Replace the control valve. Removal And Installation.
YES-2 ("P0744" and other than "P0744" are detected)-Replace the transaxle assembly. Removal And Installation (2WD) or Removal And Installation (AWD).
NO- Check intermittent incident. Intermittent Incident.