CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0741 and 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 shift solenoid valves SL and DSU to perform lock-up control in response to the driving conditions.

Note:

If any parts inside the torque converter assembly are damaged, DTC P0741/64 and P2757/64 could be output. In this case, make sure to replace both the torque converter assembly and the continuously variable transaxle assembly as broken pieces may have entered through the oil passages and some of them may be present in the continuously variable transaxle assembly.

Tip:

Shift solenoid valve DSU controls the lock-up clutch pressure in response to the input torque.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0741

Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  1. The engine is warmed up, and the vehicle is driven at a speed of 10 km/h (6.2 mph) or more with the shift lever in D.

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

  3. -

  4. 2 trip detection logic

  • Continuously variable transaxle assembly

  • Torque converter assembly

Comes on

DTC stored

P2757

Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance (Shift Solenoid Valve DSU)

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  1. The engine is warmed up, and the vehicle is driven at a speed of 10 km/h (6.2 mph) or more with the shift lever in D.

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

  3. -

  4. 2 trip detection logic

  1. The engine is warmed up, and the vehicle is driven at a speed of 8 km/h (5.0 mph) or more with the shift lever in D.

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

  3. -

  4. 2 trip detection logic

  • Continuously variable transaxle assembly

  • Torque converter assembly

Comes on

DTC stored

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 shift solenoid valves SL and DSU. When the rotating speeds are different than expected, the ECM detects the problem, illuminates the MIL and stores the DTC.

CAUTION / NOTICE / HINT

Note:

  • Perform initialization when parts related to the continuously variable transaxle are replaced.

    Click hereClick here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE

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

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result

      Proceed to

      Only P0741 and/or P2757 is output

      P0741 and/or P2757 and other DTCs are output
      Tip:

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

    P0741 and/or P2757 and other DTCs are output

    GO TO DTC CHART

    Click hereClick hereClick here

    Only P0741 and/or P2757 is output

  2. CLEAR DTC

    1. Clear the DTC.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  3. PERFORM DRIVE TEST

    C246168C01

    *1

    Oil seal

    *a

    Example of the damage

    *b

    Damage
    CAUTION:

    Strictly observe posted speed limits, traffic laws and road conditions when performing the road 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 and 100°C (122 and 212°F).

    • Perform the test with the A/C off and no electrical load.

    • Make sure to replace both the torque converter assembly and the continuously variable transaxle assembly if any parts inside the torque converter assembly are damaged. Broken pieces may have entered through the oil passages and some of them may be present in the continuously variable transaxle assembly.

    Tip:

    • 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, air conditioning and brake operations.

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Engine Speed

      SPD (NT)

      Lock Up

    5. Check the Data List while driving.

      Result

      Result

      Proceed to

      When the lock-up is on, the turbine speed is lower than the engine speed.

      A

      When the lock-up is off, the turbine speed is equal to the engine speed.

      When the lock-up is on, the turbine speed is equal to the engine speed.

      B

      When the lock-up is off, the turbine speed is lower than the engine speed.
    B

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLYClick here

    A

  4. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

    1. Replace the continuously variable transaxle assembly.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  5. REPLACE TORQUE CONVERTER ASSEMBLY

    1. Replace the torque converter assembly.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM INITIALIZATION

    Click hereClick here