CVT RE0F09B 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 RE0F09B.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace damaged parts. CVT RE0F09B.

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

1.Turn ignition switch OFF.
2.Disconnect CVT unit harness connector.
3.Check torque converter clutch solenoid valve. Refer to "Component Inspection (Torque Converter Clutch Solenoid Valve)".
Is the inspection result normal?
YES- GO TO 3.
NO- Replace transaxle assembly. Exploded View.

3. CHECK LOCK-UP SELECT SOLENOID VALVE

Check lock-up select solenoid valve. Refer to "Component Inspection (Lock-up Select Solenoid Valve)".
Is the inspection result normal?
YES- GO TO 4.
NO- Replace transaxle assembly. Exploded View.

4. CHECK SECONDARY SPEED SENSOR SYSTEM

Check secondary speed sensor system. Refer to "DTC Logic".

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 RE0F09B Input Speed Sensor A.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace damaged parts.

6. DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES- Replace TCM. Exploded View.
NO- Repair or replace damaged parts.


Component Inspection (Torque Converter Clutch Solenoid Valve)


1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE






Check resistance between CVT unit terminal 12 and ground.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace transaxle assembly. Exploded View.


Component Inspection (Lock-up Select Solenoid Valve)


1. CHECK LOCK-UP SELECT SOLENOID VALVE






Check resistance between CVT unit connector terminal and ground.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace transaxle assembly. Exploded View.