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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission System (UA80F) - Diagnostic Codes (2 Of 2) & Symptom Tests >> Automatic Transaxle System >> DTC P2756-12: Torque Converter Clutch Pressure Control Solenoid Control Circuit Short to Battery [12/2019 - 10/2022] >> Procedure

DTC P2756-12: Torque Converter Clutch Pressure Control Solenoid Control Circuit Short to Battery [12/2019 - 10/2022]: Procedure

  1. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SOLENOID (SLU) VALVE) - ECM) 
    1. Disconnect the C54 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C54-76 (SLU+) or C54-61 (SLU-) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. REPLACE ECM 
    1. Replace the ECM.

      Refer to COMPONENTS [12/2019 - 10/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION. Refer to  REGISTRATION [12/2019 - 10/2022] 

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
    1. Disconnect the C51 transmission wire connector.
    2. Disconnect the C54 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C51-5 (SLU+) or C54-76 (SLU+) - Other terminals Always 10 kΩ or higher
      C51-4 (SLU-) or C54-61 (SLU-) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) 

    Result: 

    OK 

    See step  4

  4. INSPECT SOLENOID (SLU) VALVE 
    1. Remove the solenoid (SLU) valve.
      GTY745206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Solenoid (SLU) Valve)

      Refer to DISASSEMBLY [12/2019 - 10/2022]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      Solenoid (SLU) valve connector terminal 1 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
    3. Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

      OK

      Valve moves and makes operating sound.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  COMPONENTS [12/2019 - 10/2022] 

    Result: 

    NG 

    REPLACE SOLENOID (SLU) VALVE. Refer to  COMPONENTS [12/2019 - 10/2022] 

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