P0740

P0740 TORQUE CONVERTER

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
Always drive vehicle at a safe speed.

1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. CHECK DTC DETECTION

With CONSULT
1.Start the engine.
2.Warm up the engine. [Set the CVT fluid to 10�C (50�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.
3.Drive the vehicle.
4.Maintain the following conditions for 10 seconds or more.





5.Stop the vehicle.
6.Check DTC.
With GST
Follow the procedure "With CONSULT".
Is "P0740" detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Electrical Diagrams.

1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

1.Turn ignition switch OFF.
2.Disconnect CVT unit connector.
3.Check torque converter clutch solenoid valve. Refer to "Component Inspection (Torque Converter Clutch Solenoid Valve)" .
Is the inspection result normal?
YES- GO TO 2.
Revision: March 20122013 Infiniti JX
NO- Replace transaxle assembly due to malfunction in torque converter clutch solenoid valve. Refer to
"Removal and Installation" Removal and Installation.

2. CHECK CIRCUIT BETWEEN TCM AND CVT UNIT

1.Disconnect TCM connector.
2.Check continuity between TCM harness connector terminal and CVT unit harness connector terminal.





3.Check continuity between TCM harness connector terminal and ground.





Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
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 connector terminal and ground.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace transaxle assembly due to malfunction in torque converter clutch solenoid valve. Refer to
"Removal and Installation" Removal and Installation.
Revision: March 20122013 Infiniti JX