CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM(for 1ZR-FAE), Diagnostic DTC:P0741, P075B, P2757

DTC Code DTC Name
P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)
P075B Shift Solenoid "G" Performance or Stuck Off
P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)

DESCRIPTION

The ECM uses the shift solenoid valves SC and SL to switch control of the shift solenoid valve SLU between forward and reverse clutch control and lock-up control in response to driving conditions.

Tech Tips

If DTC P0741 is stored after the engine has stalled, the lock-up shift solenoid valve (shift solenoid valve SL) may be malfunctioning.

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


    DTC Detection Condition 1

  1. The ECM sends a lock-up OFF command and turns the shift solenoid valves SC and SL OFF.

  2. The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

  3. 1 second or more

  4. 2-trip detection logic


    DTC Detection Condition 2

  1. The ECM turns the shift solenoid valves SC and SL ON.

  2. The difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more.

  3. 1 second or more

  4. 2-trip detection logic


    DTC Detection Condition 3

  1. The vehicle is being driven.

  2. The lock-up ON command is sent, but lock-up control is not performed.

  3. 1 second or more

  4. 2-trip detection logic

  • Torque converter assembly

  • Continuously variable transaxle assembly

 Comes on DTC stored
P075B Shift Solenoid "G" Performance or Stuck Off

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


    DTC Detection Condition 1

  1. The ECM turns the shift solenoid valves SC and SL OFF.

  2. The difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more.

  3. 1 second or more

  4. 2-trip detection logic


    DTC Detection Condition 2

  1. The vehicle is being driven.

  2. The lock-up ON command is sent, but lock-up control is not performed.

  3. 1 second or more

  4. 2-trip detection logic


    DTC Detection Condition 3

  1. The ECM sends a lock-up ON command and turns the shift solenoid valves SC and SL ON.

  2. The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

  3. 1 second or more

  4. 2-trip detection logic

  • Torque converter assembly

  • Continuously variable transaxle assembly

 Comes on DTC stored
P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)

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


    DTC Detection Condition 1

  1. The ECM sends a lock-up ON command, and turns the shift solenoid valves SC and SLU OFF and SL ON.

  2. The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

  3. 1 second or more

  4. 2-trip detection logic


    DTC Detection Condition 2

  1. The vehicle is being driven.

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

  3. 1 second or more

  4. 2-trip detection logic

  • Torque converter assembly

  • Continuously variable transaxle assembly

 Comes on DTC stored

MONITOR DESCRIPTION

When performing lock-up control (on/off) of the torque converter, the ECM compares the transmission revolution sensor (NT) output speed and engine speed (NE) to detect mechanical malfunctions in the shift solenoid valves SL and SC.

If the torque converter does not lock-up while a lock-up ON command is being sent, the ECM detects it as a mechanical malfunction of the shift solenoid valve SLU.

If the difference between the engine speed (NE) and transmission revolution sensor (NT) output speed or transmission revolution sensor (NIN) output speed and transmission revolution sensor (NT) output speed is outside of the threshold, the ECM detects the malfunction, illuminates the MIL and stores a DTC.

CAUTION / NOTICE / HINT

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Drive the vehicle and confirm the lock-up on and off conditions according to Road Test.

    Click here

  2. Turn the ignition switch off.

  3. Perform step (1) again.

  4. Check for DTCs again.

    Click here

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0741, P075B 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.

      Tech Tips

      If any DTCs other than P0741, P075B or P2757 are output, perform troubleshooting for those DTCs first.

      Result
      Result Proceed to
      Only DTC P0741, P075B and/or P2757 is output A
      DTC P0741, P075B and/or P2757 and other DTCs are output B

    B

    GO TO DTC CHART Click here

    A

  2. CLEAR DTC


    1. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  3. PERFORM DRIVE TEST

    CAUTION:

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

    Note


    • This test must be performed after checking and confirming that the engine is normal.

    • Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).

    • Perform the test with the air conditioning 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 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), SPD (NIN), Lock Up, SL Solenoid Status and Solenoid (SC).

    5. According to the display on the GTS, read the Data List while driving.


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine Speed Engine speed

      Min.: 0 rpm

      Max.: 16383 rpm

      		 680 to 780 rpm: Idling When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.
      SPD (NT) Input turbine speed (NT)

      Min.: 0 rpm

      Max.: 12750 rpm

      • Input turbine speed (NT) equal to engine speed (NE): Lock-up ON (After warming up engine)

      • Input turbine speed (NT) nearly equal to engine speed (NE): Lock-up OFF (Idling with shift lever in P or N)

      • 0 rpm: Vehicle stopped with shift lever in R

      		 Data is displayed in increments of 50 rpm.
      SPD (NIN) Primary pulley speed (NIN)

      Min.: 0 rpm

      Max.: 12750 rpm

      • 0 rpm: Vehicle stopped

      • Primary pulley speed (NIN) equal to engine speed (NE): Lock-up ON (After warming up engine)

      		 Data is displayed in increments of 50 rpm.
      Lock Up Lock-up OFF or ON

      • ON: Lock-up operating

      • OFF: Lock-up not operating

      		 -
      SL Solenoid Status Shift solenoid valve SL status OFF or ON

      • ON: Lock-up permitted

      • OFF: Lock-up not permitted

      		 -
      Solenoid(SC) Shift solenoid valve SC status OFF or ON

      • ON: For 1 second after moving shift lever from P to D or R, or N to D or R

      • ON: Lock-up ON to OFF

      • OFF: Engine idling

      		 -

      Powertrain > Engine and ECT > Data List
      Tester Display
      Engine Speed
      SPD (NT)
      SPD (NIN)
      Lock Up
      SL Solenoid Status
      Solenoid(SC)
      Result
      Result Proceed to
      When Lock Up is ON, the value of SPD (NT) is lower than the value of Engine Speed. A
      When SL Solenoid Status and Solenoid(SC) are OFF, the value of SPD (NT) is equal to the value of Engine Speed.
      When SL Solenoid Status and Solenoid(SC) are ON, the difference between the value of SPD (NT) and SPD (NIN) is large.
      When Lock Up is ON, the value of SPD (NT) is equal to the value of Engine Speed. B
      When SL Solenoid Status and Solenoid(SC) are OFF, the value of SPD (NT) is lower than the value of Engine Speed.
      When SL Solenoid Status and Solenoid(SC) are ON, the value of SPD (NT) is equal to the value of SPD (NIN).

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  4. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly and torque converter assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here