Torque Converter

Description

- The torque converter clutch solenoid valve is activated, with the gear in D4 and D3, by the TCM in response to signals sent from the output speed sensor and the ECM (throttle opening). Lock-up piston operation will then be controlled.
- Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
- When the accelerator pedal is depressed (less than 2/8) on lock-up condition, the engine speed should not change abruptly. If there is an abrupt change in engine speed, there is no lock-up.


CONSULT Reference Value in Data Monitor Mode

Remarks: Specification data are reference values.







On Board Diagnosis Logic

- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0740 T/C CLUTCH SOL" with CONSULT or 7th judgement flicker without CONSULT is detected when TCM detects an improper voltage drop while it tries to operate solenoid valve.


Possible Cause

- Torque converter clutch solenoid valve
- Harness or connector (The solenoid circuit is open or shorted.)


DTC Confirmation Procedure


CAUTION:
- Always drive vehicle at a safe speed.
- If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT

1.Turn ignition switch ON. (Do not start engine.)
2.Select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT and wait at least 1 second.
3.Touch "START".
4.Start engine and maintain the following conditions for at least 5 consecutive seconds.





5.If the check result is NG, go to .

WITH GST

Follow the procedure "WITH CONSULT".

WITHOUT CONSULT

1.Start engine.
2.Drive vehicle in D1--> D2--> D3--> D4--> D4 lock-up position.
3.Perform self-diagnosis. Automatic Transmission .
4.If the check result is NG, go to .


Wiring Diagram - AT - TCV







TCM TERMINALS AND REFERENCE VALUES

Automatic Transmission.


Diagnosis Procedure


1. CHECK INPUT SIGNAL





1.Start engine.
2.Select "MAIN SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
3.Read out the value of "TCC S/V DUTY" while driving. Check the value changes according to driving speed.










1.Start engine.





2.Check voltage between TCM connector terminal and ground.





OK or NG
OK- GO TO 5.
NG- GO TO 2.

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect TCM connector.





3.Check resistance between TCM connector terminal and ground.





OK or NG
OK - GO TO 5.
NG- GO TO 3.

3. CHECK HARNESS BETWEEN TCM AND TERMINAL CORD ASSEMBLY HARNESS CONNECTOR

1.Turn ignition switch OFF.
2.Disconnect terminal cord assembly harness connector and TCM connector.





3.Check continuity between terminal cord assembly harness connector terminal and TCM connector terminal.





4.If OK, check harness for short to ground and short to power.
5.If OK, check continuity between ground and transaxle assembly.
6.Reinstall any part removed.
OK or NG
OK- GO TO 4.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK VALVE RESISTANCE

1.Turn ignition switch OFF.
2.Disconnect terminal cord assembly connector in engine room.





3.Check resistance between terminal cord assembly harness connector terminal and ground.





OK or NG
OK- GO TO 5.
NG- Repair or replace damaged parts.

5. CHECK DTC

Perform .
OK or NG
OK-INSPECTION END
NG- GO TO 6.

6. CHECK TCM

1.Check TCM input/output signal. Automatic Transmission .
2.If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK-INSPECTION END
NG- Repair or replace damaged parts.


Component Inspection


TORQUE CONVERTER CLUTCH SOLENOID VALVE

- For removal, Service and Repair .
Resistance Check





- Check resistance between terminal and ground.





Operation Check





- Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.