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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System - Diagnostic Codes - (Hybrid) (5 Of 8) >> Hybrid Control System >> DTC P0A38-257: Generator Temperature Sensor Circuit Low; DTC P0A39-259: Generator Temperature Sensor Circuit High [10/2015 - ] >> Procedure

DTC P0A38-257: Generator Temperature Sensor Circuit Low; DTC P0A39-259: Generator Temperature Sensor Circuit High [10/2015 - ]: Procedure

  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR) 

    See 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 (GENERATOR TEMPERATURE SENSOR CONNECTOR) 
    1. Check the connection condition of the B46 generator 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 [10/2014 - ]

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in the connector.

      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
      GTY720496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (MOTOR TEMP NO2) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
    4. Read the Data List.

      Result

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

    Result: 

    B 

    See step  6

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  4

  4. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR) 
    1. Disconnect the B46 generator temperature sensor connector.
      GTY720496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.
      GTY687107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Generator Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      B46-4 (GMT) - B46-8 (GMTG) Power switch off 0.3436 to 1442 kΩ
    3. Reconnect the B46 generator temperature sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

    When Not Using the Engine Support Bridge: (Refer to COMPONENTS [10/2014 - ] )

    When Using the Engine Support Bridge: (Refer to COMPONENTS [10/2015 - ] )

    Result: 

    OK 

    See step  5

  5. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 
    1. Connect terminals 26 (GMT) and 27 (GMTG) of the A67 hybrid vehicle control ECU assembly connector.
      GTY717154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (to Hybrid Vehicle Control ECU Assembly)
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
    5. Read the Data List.

      OK

      Tester Display Condition Specified Condition
      Motor Temp No2 Terminals A67-26 (GMT) and A67-27 (GMTG) connected
      Power switch on (IG)      		 215°C (419°F)

      Result

      Proceed to
      OK
      NG
    6. Turn the power switch off.

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [10/2015 - ] 

  6. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR) 
    1. Disconnect the B46 generator temperature sensor connector.
      GTY720496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.
      GTY687107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Generator Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      B46-4 (GMT) - B46-8 (GMTG) Power switch off 0.3436 to 1442 kΩ
    3. Reconnect the B47 generator temperature sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

    When Not Using the Engine Support Bridge: (Refer to COMPONENTS [10/2014 - ] )

    When Using the Engine Support Bridge: (Refer to COMPONENTS [10/2015 - ] )

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (GENERATOR TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the B46 generator temperature sensor connector.
    2. Disconnect the A67 hybrid vehicle control ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      B46-4 (GMT) - A67-26 (GMT) Power switch off Below 1 Ω
      B46-8 (GMTG) - A67-27 (GMTG) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      B46-4 (GMT) or A67-26 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      B46-8 (GMTG) or A67-27 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher
      GTY717116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Generator Temperature Sensor)
      *b Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
    4. Reconnect the A67 hybrid vehicle control ECU assembly connector.
    5. Reconnect the B46 generator temperature sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [10/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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