AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P07407E

DTC Code DTC Name
P07407E Torque Converter Clutch Actuator Stuck On

DESCRIPTION

The ECM uses signals from the throttle position sensor, mass air flow meter, transmission revolution sensor (NT), transmission revolution sensor (NC) and crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The ECM monitors the engagement of the clutch using the transmission revolution sensor (NT), transmission revolution sensor (NC) and crankshaft position sensor.

Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect solenoid (SL) valve, transmission valve body assembly and torque converter assembly mechanical problems.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P07407E Torque Converter Clutch Actuator Stuck On

All of the following conditions are met (2-trip detection logic):


  • Engine coolant temperature is 40°C (104°F) or higher.

  • ATF temperature is -10°C (14°F) or higher.

  • The vehicle is being driven with the shift lever in D.

  • No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system.

  • When the ECM commands the solenoid (SL) valve OFF, the difference between the turbine speed (NT) and engine speed (NE) is 70 rpm or more for 3.5 seconds or more.

  • Solenoid (SL) valve remains closed

  • Transmission wire

  • Transmission valve body assembly is blocked

  • Torque converter assembly

  • Automatic transaxle assembly (clutch, brake, gear etc.)

  • Line pressure is too low

 Comes on DTC stored

SAE Code:

P0741

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the ECM based on the transmission revolution sensor (NT), transmission revolution sensor (NC), engine speed, engine load, engine temperature, vehicle speed, automatic transaxle fluid temperature, and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transmission gear by comparing the input turbine speed (NT) to the output shaft speed (NC). When certain conditions are met, the ECM requests "lock-up" by cutting control voltage to the solenoid (SL) valve. When the solenoid (SL) valve is turned off, pressure is applied to the lock-up relay valve and the torque converter is locked.

If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the ECM interprets this as a fault in the solenoid (SL) valve or lock-up system performance. The ECM will illuminate the MIL and store the DTC.

Tech Tips

Example:

When any of the following is met, the system judges it as a malfunction.


  • There is a difference in rotation speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up.

    (Engine speed is at least 70 rpm more than the input turbine speed.)

  • There is no difference in rotation speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up off.

    (The difference between engine speed and input turbine speed is less than 35 rpm.)

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Tech Tips

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for 2 minutes or more.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine.

  7. Perform the Lock-up Function inspection in Road Test.

    Click here

  8. Stop the vehicle.

  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

  10. Input the DTC: P07407E.

  11. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P074011.

Click here

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here


  1. ACTIVE TEST

    Tech Tips

    Using the GTS to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Transmission / Active Test.

    7. According to the display on the GTS, perform the Active Test.


      Powertrain > Transmission > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Activate the Lock Up Solenoid Operates the solenoid (SLU and SL) valve to control the automatic transaxle lock-up condition ON or OFF

      Can be used to check the operation of the solenoid (SLU and SL) valve.


        [Vehicle Condition]

      • Vehicle speed: 60 km/h (36 mph) or more

      Powertrain > Transmission > Active Test
      Tester Display
      Activate the Lock Up Solenoid

      Tech Tips

      This test can be conducted when the vehicle speed is 60 km/h (36 mph) or more.

    8. Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

      Tech Tips


      • When changing the accelerator pedal opening angle while driving, if the engine speed does not change, lock-up is on.

      • Slowly release the accelerator pedal in order to decelerate, but do not fully release the pedal. (Fully releasing the pedal will close the throttle valve and lock-up may be prohibited.)

      B006X26E28

PROCEDURE


  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P07407E)


    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 / Transmission / Trouble Codes.


      Powertrain > Transmission > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTC P07407E is output A
      DTC P07407E and other DTCs are output B

      Tech Tips

      If any other codes besides P07407E are output, perform the troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT TRANSMISSION WIRE (SOLENOID (SL) VALVE)


    1. B006Z4FC06
      *a

      Component without harness connected

      (Transmission Wire)

      Disconnect the C93 transmission wire connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      13 (S1) - Body ground 20°C (68°F) 11 to 15 Ω
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SOLENOID (SL) VALVE (RESISTANCE) Click here

    OK

  3. INSPECT SOLENOID (SL) VALVE (OPERATION)


    1. B006WT4C01
      *1 Solenoid (SL) Valve

      Remove the solenoid (SL) valve.

      Click here

    2. Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.

      OK
      Valve moves and makes an operating sound.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SOLENOID (SL) VALVE Click here

    OK

  4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Inspect the transmission valve body assembly.

      Click here

      OK
      There is no foreign matter on each valve and they operate smoothly.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

  5. INSPECT TORQUE CONVERTER ASSEMBLY


    1. Inspect the torque converter assembly.

      Click here

      OK
      The torque converter assembly is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY Click here

    OK

  6. REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY


    1. Repair or replace the automatic transaxle assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM REGISTRATION Click here

  7. INSPECT SOLENOID (SL) VALVE (RESISTANCE)


    1. B006WS2C01
      *1 Solenoid (SL) Valve

      Remove the solenoid (SL) valve.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Solenoid (SL) valve connector terminal - Solenoid (SL) valve body 20°C (68°F) 11 to 15 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SOLENOID (SL) VALVE Click here