CVT RE0F10A

P0740 TORQUE CONVERTER





Description
- The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehicle speed and accelerator pedal position sensors. Lock-up piston operation will then be controlled.
- Lock-up operation, however, is prohibited when CVT fluid temperature is too low.
- When the accelerator pedal is depressed (less than 2.0/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE

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. Wait at least 10 consecutive seconds.
3. Perform "SELF-DIAG RESULTS" mode for "TRANSMISSION".
With GST
Follow the procedure "With CONSULT-III".
Is "P0740" detected?
YES - Go to CVT RE0F10A.
NO - Check intermittent incident. Refer to Intermittent Incident.




Diagnosis Procedure
1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect TCM harness connector.
3. Check resistance between TCM harness connector F16 terminal
38 and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 2.
2.CHECK HARNESS BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID
VALVE) (PART 1)





1. Disconnect CVT unit harness connector.
2. Check continuity between TCM harness connector F16 (A) terminal 38 and CVT unit harness connector F46 (B) terminal 12.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace damaged parts.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID
VALVE) (PART 2)





Check continuity between TCM harness connector F16 terminal 38 and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace damaged parts.
4.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check torque converter clutch solenoid valve. Refer to CVT RE0F10A.
Is the inspection result normal?
YES - GO TO 6.
NO - GO TO 5.
5.CHECK DTC
With CONSULT-III
1. Turn ignition switch ON.
2. Perform "SELF-DIAG RESULTS" mode for "TRANSMISSION".
Is only "P0740" detected?
YES - Replace control valve. Refer to Exploded View.
NO - Replace transaxle assembly. Refer to Removal And Installation.
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 control valve. Refer to Exploded View.