4AT RE4F03C

P0743 TORQUE CONVERTER

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
Be careful of the driving speed.

1. PREPARATION BEFORE WORK

If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.
- GO TO 2.

2. CHECK DTC DETECTION

1.Drive the vehicle.
2.Maintain the following conditions for 5 seconds or more.





3.Stop the vehicle.
4.Check the first trip DTC.
Is "P0743" detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK CIRCUIT BETWEEN TCM AND A/T UNIT

1.Turn ignition switch OFF.
2.Disconnect the TCM connector and A/T unit connector.
3.Check the continuity between TCM harness connector and ground.





Is the check result normal?
YES - GO TO 2.
NO- Repair or replace the malfunctioning parts.

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check the torque converter clutch solenoid valve. Refer to "Component Inspection (Torque Converter Clutch Solenoid Valve)" .
Is the check result normal?
YES - Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Repair or replace the malfunctioning parts.


Component Inspection (Torque Converter Clutch Solenoid Valve)


1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check the resistance between the A/T unit connector terminal and ground.





Is the check result normal?
YES- INSPECTION END
NO- There is a malfunction of the torque converter clutch solenoid valve. Replace the transaxle assembly. Refer to "Removal and Installation" Removal and Replacement.