CVT RE0F09B

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-III
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-III".
Is "P0744" detected?
YES - Go to CVT RE0F09B.
NO - Check intermittent incident. Refer to Intermittent Incident.




Diagnosis Procedure
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT RE0F09B.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace damaged parts. Refer to 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 CVT RE0F09B.
Is the inspection result normal?
YES - GO TO 3.
NO - Replace transaxle assembly. Refer to Exploded View.
3.CHECK LOCK-UP SELECT SOLENOID VALVE
Check lock-up select solenoid valve. Refer to CVT RE0F09B.
Is the inspection result normal?
YES - GO TO 4.
NO - Replace transaxle assembly. Refer to Exploded View.
4.CHECK SECONDARY SPEED SENSOR SYSTEM
Check secondary speed sensor system. Refer to CVT RE0F09B.
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. Refer to CVT RE0F09B.
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. Refer to 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. Refer to 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. Refer to Exploded View.