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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 “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 : 10В°C (50В°F) or more

With GST


  1. Start the engine.
  2. 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

  1. Drive the vehicle.
  2. Maintain the following conditions for 10 seconds or more.

Selector lever : “D” position

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

  1. Stop the vehicle.
  2. Check the first trip DTC.

Is “P0740” detected? YES >> Go to TM-185, "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 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.

result normal? 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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