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СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ, Diagnostic DTC:P2757

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DTC Code DTC Name
P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)
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DESCRIPTION

The TCM uses the signals from the throttle position sensor, air-flow meter, input turbine speed sensor, output speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

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

DTC Code DTC Detection Condition Trouble Area
P2757

Either condition is met (2-trip detection logic):


  • Both conditions are met:


    • Lock-up does not occur when requested.

    • No. 3 ATF pressure switch is off.

  • Both conditions are met:


    • No. 3 ATF pressure switch is on when lock-up does not occur.

    • Lock-up occurs when shift solenoid valve SLU is commanded to turn on in the lock-up range.

  • Shift solenoid valve SLU remains open or closed

  • Valve body is blocked

  • Torque converter clutch

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

  • Line pressure is too low
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MONITOR DESCRIPTION

Torque converter lock-up is controlled by the TCM based on the input turbine speed sensor (speed sensor NT), output speed sensor (speed sensor NC), engine speed, engine load, engine temperature, vehicle speed, ATF temperature and gear selection. The TCM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The TCM calculates the actual transmission gear by comparing input turbine speed (NT) to output shaft speed (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to shift solenoid valve SLU. When shift solenoid valve SLU is turned on, it applies pressure to the lock-up relay valve and locks the torque converter clutch.

If the TCM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the TCM interprets this as a fault in shift solenoid valve SLU or lock-up system performance.

The TCM will turn on the MIL and store the DTC.

Example:

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


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INSPECTION PROCEDURE

Refer to DTC P0741 (Click here).

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (IN ADDITION TO DTC P2757)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / ECT / DTC.

    5. Read the DTCs using the intelligent tester.

      Table 1. Result
      Result Proceed to
      Only P2757 is output A
      P2757 and other DTCs are output B
      Tip:

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


  2. Click here

    INSPECT SHIFT SOLENOID VALVE SLU


    1. A01IOMJE06

      Remove shift solenoid valve SLU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 5.0 to 5.6 Ω

    3. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

      OK
      Measurement Condition Specified Condition

      • Battery positive (+) with a 21 W bulb → Terminal 1

      • Battery negative (-) → Terminal 2

      		 Valve moves and makes an operating noise
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (Shift Solenoid Valve SLU)

  3. Click here

    INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly (Click here).

      OK
      There are no foreign objects on any valve.

  4. Click here

    INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY


    1. Check the torque converter clutch assembly (Click here).

      OK
      The torque converter clutch operates normally.

  5. Click here

    REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLYClick here

  6. Click here

    GO TO DTC CHARTClick here

  7. Click here

    REPLACE SHIFT SOLENOID VALVE SLUClick here

  8. Click here

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLYClick here

  9. Click here

    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLYClick here