Nissan Versa (N17): P0743 Torque converter

DTC Logic

DTC DETECTION LOGIC

DTC	Trouble diagnosis name	DTC detection condition	Possible causes
P0743	Torque Converter Clutch Circuit Electrical	The TCM torque converter clutch solenoid valve current monitor reading is 200 mA or less continuously for 480 msec or more under the following diagnosis conditions: - Diagnosis conditions - Solenoid valve output current: 750 mA or more - GND short circuit diagnosis occurs in the solenoid valve drive circuit. - TCM power supply voltage: More than 11 V	- Harness or connector (Torque converter clutch solenoid valve circuit is shorted to ground) - Torque converter clutch solenoid valve

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.

FLUID TEMP : 10C (50F) or more

With GST

1. Start the engine.
2. Set the CVT fluid to 10C (58F) or more.

NOTE: When the ambient temperature is 20C (68F), the CVT fluid usually increases to 50 to 80C (122 to 176F) with driving in an urban area for approximately 10 minutes.

Is the CVT fluid 10C (58F) 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.

Selector lever : "D" position

Vehicle speed : 40 km/h (25 MPH) or more

Is "P0743" detected?

YES >> Go to TM "Diagnosis Procedure".

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. Refer to TM "Component Inspection (Torque Converter Clutch Solenoid Valve)".

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI "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.

Refer to TM "Removal and Installation".