P0743

P0743 TORQUE CONVERTER

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
Be careful of the driving speed.

1. PREPARATION BEFORE OPERATION (PART 1)

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. PREPARATION BEFORE OPERATION (PART 2)

With CONSULT
1.Start the engine.
2.Select "Data Monitor" in "TRANSMISSION".
3.Select "FLUID TEMP".
4.Confirm that the CVT fluid temperature is in the following range.





With GST
1.Start the engine.
2.Set the CVT fluid to 10�C (58�F) or more.
NOTE:
When the ambient temperature is 20�C (68�F), the CVT fluid usually increases to 50 to 80�C (122 to
176�F) with driving in an urban area for approximately 10 minutes.
Is the CVT fluid 10�C (58�F) or more?
YES- GO TO 3.
NO- 1.Warm the transaxle.
2.GO TO 3.

3. 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 .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK CIRCUIT BETWEEN TCM AND CVT UNIT

1.Turn ignition switch OFF.
2.Disconnect TCM connector and CVT unit connector.
3.Check continuity between TCM harness connector terminal and ground.





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

2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check torque converter clutch solenoid valve. .
Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO- Repair or replace malfunctioning parts.


Component Inspection (Torque Converter Clutch Solenoid Valve)


1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.





Is the inspection result normal?
YES- INSPECTION END
NO- There is a malfunction of torque converter clutch solenoid valve. Replace transaxle assembly.
Removal And Installation.