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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 113 (Hybrid Control System (2WD) - Diagnostic Codes (6 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P274A-11: Transmission Fluid Temperature Sensor "C" Circuit Short to Ground; DTC P274A-15: Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open [12/2019 - 11/2023] >> Procedure

DTC P274A-11: Transmission Fluid Temperature Sensor "C" Circuit Short to Ground; DTC P274A-15: Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (INTERMEDIATE CONNECTOR) 
    1. Check that the intermediate connector which connects the transmission fluid temperature sensor to the hybrid vehicle control ECU is securely connected with no deformation, and that there is no contamination by water or foreign matter.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2019 - ]

      HINT: 

      For vehicles in which the intermediate connector is inside the relay block, check for signs of water intrusion inside the relay block.

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in the connectors.

      Result

      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR) 
    1. Check the connection condition of the transmission fluid temperature sensor connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2019 - ]

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in the connector.

      GTY904686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  4

  4. READ VALUE USING GTS (TRANSAXLE OIL TEMPERATURE) 
    1. Read the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Transaxle Oil Temperature

      Result

      Result  Proceed to
      -40°C (-40°F) A
      215°C (419°F) B
      Same as actual temperature C
    2. Turn the ignition switch off.

    Result: 

    B 

    See step  7

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  5

  5. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR) 
    1. Disconnect the C63 transmission fluid temperature sensor connector.
      GTY904686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.
      GTY897171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      C63-3 (TTA) - C63-13 (ETTA) Ignition switch off 1.4 to 94 kΩ
    3. Reconnect the C63 transmission fluid temperature sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  6

  6. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect terminals 40 (TTA) and 39 (ETTA) of the A31 hybrid vehicle control ECU connector.
      GTY894635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -
    2. Read the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Transaxle Oil Temperature

      OK

      Tester Display Condition Specified Condition
      Transaxle Oil Temperature Terminals A31-40 (TTA) and A31-39 (ETTA) connected
      Ignition switch ON      		 215°C (419°F)

      Result

      Proceed to
      OK
      NG
    3. Turn the ignition switch off.

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION FLUID TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU) 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

  7. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR) 
    1. Disconnect the C63 transmission fluid temperature sensor connector.
      GTY904686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C63-3 (TTA) - C63-13 (ETTA) Ignition switch off 1.4 to 94 kΩ
      GTY897171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))
    3. Reconnect the C63 transmission fluid temperature sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (TRANSMISSION FLUID TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the C63 transmission fluid temperature sensor connector.
    2. Disconnect the A31 hybrid vehicle control ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY866548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Transmission Fluid Temperature Sensor)
      *b Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      C63-3 (TTA) - A31-40 (TTA) Ignition switch off Below 1 Ω
      C63-13 (ETTA) - A31-39 (ETTA) Ignition switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      C63-3 (TTA) or A31-40 (TTA) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      C63-13 (ETTA) or A31-39 (ETTA) - Body ground and other terminals Ignition switch off 10 kΩ or higher
    4. Reconnect the A31 hybrid vehicle control ECU connector.
    5. Reconnect the C63 transmission fluid temperature sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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