Nissan Sentra manuals

Nissan Sentra Service Manual: P0744 Torque converter

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0744 TORQUE CONVERTER (Torque converter clutch circuit intermittent) The torque converter slip speed is at or above a set value (40 rpm + (Vehicle speed / 2) continuously for 30 seconds or more under the following diagnosis conditions:

Diagnosis conditions

  • Selector lever: “D” position
  • Accelerator pedal position: 1.0/8 or more
  • Vehicle speed: 10 km/h (6 MPH) or more
  • Engine speed: 450 rpm or more
  • CVT fluid temperature: 20В°C (68В°F) – 180В°C (356В°F)
  • Lockup command is being given (except for slip lockup).
  • LU PRS: More than 0.2 MPa
  • TCM power supply voltage: More than 11 V
  • Torque converter clutch solenoid valve
  • Control valve assembly
  • Torque converter

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.PREPARATION BEFORE OPERATION 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 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 range below.

FLUID TEMP : 20В°C (68В°F) or more

With GST


  1. Start the engine.
  2. Set the CVT fluid to 20В°C (68В°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 20В°C (68В°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 40 seconds or more.

Selector lever : “D” position

Accelerator pedal position : 1.0/8 or more

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

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

Is “P0744” detected? YES >> Go to TM-189, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK LINE PRESSURE

Perform line pressure test. Refer to TM-149, "Work Procedure".

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace the malfunction items.

2.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 TM-189, "Component Inspection".

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

NO >> Repair or replace the malfunction items.

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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