AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0741

DTC Code DTC Name
P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)

DESCRIPTION

The ECM uses the signals from the throttle position sensor, Mass Air Flow (MAF) meter, speed sensor (NC0), speed sensor (SP2) and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

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

DTC Code DTC Detection Condition Trouble Area
P0741 Lock-up does not occur when driving in lock-up range (normal driving at 80 km/h (50 mph)), or lock-up remains ON in lock-up OFF range (2 trip detection logic)

  • Shift solenoid valve SL remains open or closed

  • Valve body is blocked

  • Shift solenoid valve SL

  • Torque converter clutch

  • Automatic transmission (clutch, brake or gear etc.)

  • ECM

MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, MAF meter and crankshaft position sensor, the ECM sends a signal to the shift solenoid valve SL to regulate the hydraulic pressure and provide smoother gearshifts. The shift solenoid valve SL responds to commands from the ECM. The valve controls the lock-up relay valve to perform torque converter lock-up and flexible lock-up functions.

The ECM compares the engine rpm (NE) signal with the input turbine speed signal to detect torque converter lock-up. The ECM then compares the lock-up status with the lock-up schedule in the ECM memory. If the ECM does not detect lock-up at the appropriate time, it will conclude that there is a malfunction in shift solenoid valve SL. The ECM will illuminate the MIL and store the DTC.

INSPECTION PROCEDURE

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and push the intelligent tester main switch on.

    3. Enter the following menus: Powertrain / ECT / DTC / Current or Pending.

    4. Read the DTCs using the intelligent tester.

      Result
      Display (DTC output) Proceed to
      Only P0741 is output A
      P0741 and other DTCs are output B

      Tech Tips

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


    B

    GO TO DTC CHART

    A

  2. INSPECT SHIFT SOLENOID VALVE SL


    1. A01E346E05

      Remove the shift solenoid valve SL.

    2. Measure the resistance of the solenoid value.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Shift solenoid SL connector - Shift solenoid SL body 20°C (68°F) 11 to 15 Ω

    3. Connect the battery's positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

    4. Check the operating noise of the solenoid valve.

      OK
      Solenoid makes operating noise.

    NG

    REPLACE SHIFT SOLENOID VALVE SL

    OK

  3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly.

      OK
      There are no foreign objects on any valve.

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

    OK

  4. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY


    1. Check the torque converter clutch assembly.

      OK
      The torque converter clutch operates normally.

    NG

    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY