Nissan Sentra Service Manual: P0740 Torque converter

Nissan Sentra Service Manual / Transmission & driveline / Transaxle & transmission / CVT: RE0F11A / P0740 Torque converter

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0740

TORQUE CONVERTER (Torque Converter Clutch Circuit/ Open)

The TCM torque converter clutch solenoid valve current monitor reading is 200 mA or less continuously for 5 seconds or more under the following diagnosis conditions:

Diagnosis conditions

Solenoid valve output current: 750 mA or more
GND short diagnosis of the solenoid valve circuit is not satisfied.
TCM power supply voltage: More than 11 V

Harness or connector (Torque converter clutch solenoid valve circuit is open or shorted to power supply)
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 10 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 вЂњP0740вЂќ detected? YES >> Go to TM-185, "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 CVT unit harness connector terminal.

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-185, "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".

P0720 Output speed sensor

DTC Logic DTC DETECTION LOGIC DTC CONSULT screen terms (Trouble diagnosis content) DTC detection condition Possible causes P0720 OUTPUT SPEED SENSOR (Output Speed ...

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 ...

Other materials:

Wiring diagram
Power steering control system Wiring Diagram ...

Ecu diagnosis information
Ipdm e/r (intelligent power distribution module engine room) Reference Value Values on the diagnosis tool Terminal layout Physical values Fail-safe Can communication control When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe ...

Windshield-washer fluid
Windshield-washer fluid reservoir Fill the windshield-washer fluid reservoir periodically. To fill the windshield-washer fluid reservoir, lift the cap off the reservoir and pour the windshieldwasher fluid into the reservoir opening. Add a washer solvent to the washer for better cleanin ...