CVT RE0F10A Torque Converter

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
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".
Is "P0740" detected?
YES- Go to "Diagnosis Procedure".
NO- Check intermittent incident. Intermittent Incident.


Diagnosis Procedure


1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

1.Turn ignition switch OFF.
2.Disconnect CVT unit connector.
3.Check resistance between CVT unit connector terminals.





Is the inspection result normal?
YES- GO TO 2.
NO- GO TO 4.

2. CHECK CIRCUIT BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID VALVE)

(PART 1)
1.Disconnect the TCM connector.
2.Check continuity between TCM harness connector terminals and CVT unit harness connector terminals.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace damaged parts.

3. CHECK CIRCUIT BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID VALVE)

(PART 2)
Check continuity between TCM harness connector terminal and ground.






Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Repair or replace damaged parts.

4. CHECK TERMINAL CORD ASSEMBLY (PART 1)

1.Remove terminal cord assembly. Exploded View.
2.Check continuity between CVT unit harness connector terminals and control valve harness connector terminals.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace damaged parts.

5. CHECK TERMINAL CORD ASSEMBLY (PART 2)

Check terminal cord assembly harness cladding for damage.
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 "P0740" detected?
YES-1 ("P0740" only)-There is a malfunction of the CVT fluid temperature sensor. Replace the control valve. Removal And Installation.
YES-2 ("P0740" and other DTC)-Replace the transaxle assembly. Removal And Installation.
NO- Check intermittent incident. Intermittent Incident.