Nissan Sentra Service Manual: P0743 Torque converter

Nissan Sentra Service Manual / Transmission & driveline / Transaxle & transmission / CVT: RE0F11A / P0743 Torque converter

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0743

TORQUE CONVERTER (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 вЂњDTC CONFIRMATION PROCEDUREвЂќ 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

Start the engine.
Select вЂњData MonitorвЂќ in вЂњTRANSMISSIONвЂќ.
Select вЂњFLUID TEMPвЂќ.
Confirm that the CVT fluid temperature is in the following range.

FLUID TEMP : 10В°C (50В°F) or more

With GST

Start the engine.
Set the CVT fluid to 10В°C (50В°F) or more.

NOTE:

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

Is the CVT fluid 10В°C (50В°F) or more? YES >> GO TO 3.

NO >> 1. Warm the transaxle.

2. GO TO 3.

3.CHECK DTC DETECTION

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

Selector lever : вЂњDвЂќ position

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

Stop the vehicle.
Check the first trip DTC.

Is вЂњP0743вЂќ detected? YES >> Go to TM-187, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK CIRCUIT BETWEEN TCM AND CVT UNIT

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

Is the check result normal?

Is the check 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-187, "Component Inspection".

Is the check result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Repair or replace malfunctioning parts.

Component Inspection

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-283, "Removal and Installation".

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