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Home >> Lexus >> 2015 >> NX 200t Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Automatic Transmission (U661E) - Diagnostic Codes (1 Of 2)) >> Automatic Transaxle System >> DTC P0740-15: Torque Converter Clutch Circuit Short to Battery or Open [10/2014 - ] >> Procedure

DTC P0740-15: Torque Converter Clutch Circuit Short to Battery or Open [10/2014 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (SHIFT SOLENOID VALVE SL CIRCUIT) 
    1. Disconnect the ECM connector.
      GTY502097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C20-75 (SL) - Body ground 20°C (68°F) 11 to 15 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2014 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (WIRING HARNESS CONNECTOR - ECM) 
    1. Disconnect the C21 wiring harness connector.
    2. Disconnect the C20 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C21-6 (SL) - C20-75 (SL) Always Below 1 Ω
      C21-6 (SL) or C20-75 (SL) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL) 
    1. Remove the wiring harness connector.
      GTY520635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Wire)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-6 (SL) - Body ground 20°C (68°F) 11 to 15 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE WIRING HARNESS CONNECTOR. Refer to  REMOVAL [10/2014 - 09/2015]  , or refer to  REMOVAL [09/2015 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

    Result: 

    NG 

    See step  4

  4. INSPECT SHIFT SOLENOID VALVE SL 
    1. Remove shift solenoid valve SL.
      GTY373506Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Shift Solenoid Valve SL

      Refer to DISASSEMBLY [10/2014 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      Shift solenoid valve SL connector terminal - Shift solenoid valve SL body 20°C (68°F) 11 to 15 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 (+) → Shift solenoid valve SL connector
      • Battery negative (-) → Shift solenoid valve SL body
      		 Valve moves and makes an operating noise

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2014 - ] 

    Result: 

    NG 

    REPLACE SHIFT SOLENOID VALVE SL. Refer to  DISASSEMBLY [10/2014 - ] 

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