CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0741, P2757

DTC Code DTC Name
P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)
P2757 Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance (Shift Solenoid Valve DSU)

DESCRIPTION

The ECM uses the lock-up control solenoids (SL and DSU) to perform lock-up control in response to the driving conditions.

Tech Tips

The lock-up engagement solenoid DSU controls the lock-up clutch pressure in response to the input torque.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0741

  1. Shift lever in D, and driving at speed of 8 km/h (5.0 mph) or more

  2. The lock-up signal is on, but the lock-up is off

  3. -

  4. 2-trip detection logic

  • Torque converter assembly

  • Continuously variable transaxle assembly
P2757

  1. Shift lever in D, and driving at speed of 8 km/h (5.0 mph) or more

  2. The lock-up signal is on, but the lock-up is off

  3. -

  4. 2-trip detection logic

  1. Shift lever in D, and driving at speed of 8 km/h (5.0 mph) or more

  2. The lock-up signal is off, but the lock-up is on

  3. -

  4. 2-trip detection logic

MONITOR DESCRIPTION

When performing lock-up control (on/off) of the torque converter, the ECM compares the rotating speeds of the turbine (NT) and engine (NE) to detect mechanical malfunctions in the lock-up control solenoids (SL and DSU). When the rotating speeds are different, the ECM detects the problem, illuminates the MIL and stores the DTC.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741 AND P2757)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn on the tester.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC / Current or Pending.

    5. Read the DTCs using the tester.

      Result
      Result Proceed to
      Only P0741 or P2757 is output A
      P0741 and P2757 other DTCs are output B

      Tech Tips

      If any other DTCs besides P0741 or P2757 are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  3. PERFORM DRIVE TEST

    CAUTION:

    Strictly observe posted speed limits, traffic laws, and road conditions when performing the drive test.

    Note


    • This test must be conducted after checking and confirming that the engine is operating normally.

    • Perform this test while the CVT fluid temperature is between 50 to 100°C (122 to 212°F).

    • Perform the test with the A/C off.

    Tech Tips


    • Lock-up control will not operate when the CVT fluid temperature is 40°C (104°F) or less and the vehicle speed is 60 km/h (37 mph) or less or when the CVT fluid temperature is 5°C (41°F) or less.

    • Lock-up control will not operate when the engine coolant temperature is 30°C (86°F) or less.

    • The lock-up OFF vehicle speed may vary depending on the electrical load and air conditioning and brake operations.


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn on the tester.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / SPD (NT), Lock Up and Engine Speed.

    5. Check the Data List while driving.

      Result
      Result Proceed to
      When the lock-up condition is ON, the turbine revolution speed is lower than the engine revolution speed. A
      When the lock-up condition is OFF, the turbine revolution speed is equal to the engine revolution speed.
      When the lock-up condition is ON, the turbine revolution speed is equal to the engine revolution speed. B
      When the lock-up condition is OFF, the turbine revolution speed is lower than the engine revolution speed

    B

    CHECK INTERMITTENT PROBLEMS Click here

    A

  4. REPLACE TORQUE CONVERTER ASSEMBLY AND CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace torque converter assembly and continuously variable transaxle assembly Click here.


    NEXT

  5. PERFORM INITIALIZATION

    Note


    • Performing reset memory/initialization will clear the learned values of both the yaw rate and acceleration sensor (deceleration sensor 0 point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate and acceleration sensor 0 point calibration, and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Oil pressure sensor

      • Yaw rate and acceleration sensor

    • After reset memory, always perform yaw rate and acceleration sensor (deceleration sensor 0 point) calibration first, and then the CVT oil pressure calibration.

    • Always perform the 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during the 0 point calibration.


    1. Using the intelligent tester, perform the reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check for DTCs again Click here.


    NEXT

    END