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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (2GR-FXE) - Diagnostic Codes (4 Of 7) >> Hybrid Control System >> DTC P0A79-716: Drive Motor "B" Inverter Performance [02/2014 - 11/2016] >> Procedure

DTC P0A79-716: Drive Motor "B" Inverter Performance [02/2014 - 11/2016]: Procedure

  1. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR) 

    Refer to PROCEDURE - Step 15 Refer to PROCEDURE - Step 15

    Result

    Proceed to
    OK
    NG

    Result:  1

    OK 

    See step  18

    Result:  2

    NG 

    See step  2

  2. CHECK NO. 6 FLOOR WIRE (REAR MOTOR CABLE) 

    Refer to PROCEDURE - Step 34 Refer to PROCEDURE - Step 34

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    See step  9

    Result:  1

    OK 

    See step  3

  3. CHECK EXTENSION WIRE ASSEMBLY 

    Refer to PROCEDURE - Step 35 Refer to PROCEDURE - Step 35

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    See step  5

    Result:  1

    OK 

    See step  4

  4. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  18

  5. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Remove the No. 6 floor wire (rear motor cable) and extension wire assembly from the rear traction motor with transaxle assembly.
    3. Check the rear motor (MGR) for an interphase short using a milliohmmeter.
      GTY440184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without rear motor cable connected
      (Rear Traction Motor with Transaxle Assembly)
      1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

        HINT: 

        If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

        Standard Resistance

        Tester Connection Condition Specified Condition
        R3-3 (R-U) - R3-2 (R-V) Power switch off 142 to 152 mΩ
        R3-2 (R-V) - R3-1 (R-W) Power switch off 142 to 152 mΩ
        R3-1 (R-W) - R3-3 (R-U) Power switch off 142 to 152 mΩ

        HINT: 

        To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

        • R20 = Rt / {1 + 0.00393 X (T - 20)}

        The calculation is based on the following:

        • R20: Resistance at 20°C (68°F) (mΩ)
        • Rt: Measured resistance (mΩ)
        • T: Temperature when the resistance is measured (°C (°F))
    4. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
      NOTE:

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R3-3 (R-U) - Body ground Power switch off 100 MΩ or higher
      R3-2 (R-V) - Body ground Power switch off 100 MΩ or higher
      R3-1 (R-W) - Body ground Power switch off 100 MΩ or higher
    5. Install the No. 6 floor wire (rear motor cable) and extension wire assembly to the rear traction motor with transaxle assembly.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  7

    Result:  1

    OK 

    See step  6

  6. REPLACE EXTENSION WIRE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  18

  7. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  8

  8. REPLACE EXTENSION WIRE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  18

  9. CHECK EXTENSION WIRE ASSEMBLY 

    Refer to PROCEDURE - Step 35 Refer to PROCEDURE - Step 35

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    See step  13

    Result:  1

    OK 

    See step  10

  10. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Remove the No. 6 floor wire (rear motor cable) and extension wire assembly from the rear traction motor with transaxle assembly.
    3. Check the rear motor (MGR) for an interphase short using a milliohmmeter.
      GTY440183Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without rear motor cable connected
      (Rear Traction Motor with Transaxle Assembly)
      1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

        HINT: 

        If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

        Standard Resistance

        Tester Connection Condition Specified Condition
        R3-3 (R-U) - R3-2 (R-V) Power switch off 142 to 152 mΩ
        R3-2 (R-V) - R3-1 (R-W) Power switch off 142 to 152 mΩ
        R3-1 (R-W) - R3-3 (R-U) Power switch off 142 to 152 mΩ

        HINT: 

        To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

        • R20 = Rt / {1 + 0.00393 X (T - 20)}

        The calculation is based on the following:

        • R20: Resistance at 20°C (68°F) (mΩ)
        • Rt: Measured resistance (mΩ)
        • T: Temperature when the resistance is measured (°C (°F))
    4. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
      NOTE:

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R3-3 (R-U) - Body ground Power switch off 100 MΩ or higher
      R3-2 (R-V) - Body ground Power switch off 100 MΩ or higher
      R3-1 (R-W) - Body ground Power switch off 100 MΩ or higher
    5. Install the No. 6 floor wire (rear motor cable) and extension wire assembly to the rear traction motor with transaxle assembly.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  12

    Result:  1

    OK 

    See step  11

  11. REPLACE NO. 6 FLOOR WIRE 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  18

  12. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  17

  13. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Remove the No. 6 floor wire (rear motor cable) and extension wire assembly from the rear traction motor with transaxle assembly.
    3. Check the rear motor (MGR) for an interphase short using a milliohmmeter.
      GTY453957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without rear motor cable connected
      (Rear Traction Motor with Transaxle Assembly)
      1. Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

        HINT: 

        If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

        Standard Resistance

        Tester Connection Condition Specified Condition
        R3-3 (R-U) - R3-2 (R-V) Power switch off 142 to 152 mΩ
        R3-2 (R-V) - R3-1 (R-W) Power switch off 142 to 152 mΩ
        R3-1 (R-W) - R3-3 (R-U) Power switch off 142 to 152 mΩ

        HINT: 

        To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

        • R20 = Rt / {1 + 0.00393 X (T - 20)}

        The calculation is based on the following:

        • R20: Resistance at 20°C (68°F) (mΩ)
        • Rt: Measured resistance (mΩ)
        • T: Temperature when the resistance is measured (°C (°F))
    4. Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
      NOTE:

      Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R3-3 (R-U) - Body ground Power switch off 100 MΩ or higher
      R3-2 (R-V) - Body ground Power switch off 100 MΩ or higher
      R3-1 (R-W) - Body ground Power switch off 100 MΩ or higher
    5. Install the No. 6 floor wire (rear motor cable) and extension wire assembly to the rear traction motor with transaxle assembly.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  15

    Result:  1

    OK 

    See step  14

  14. REPLACE EXTENSION WIRE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  17

  15. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  16

  16. REPLACE EXTENSION WIRE ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  17

  17. REPLACE NO. 6 FLOOR WIRE 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  18

  18. REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to COMPONENTS [02/2014 - 11/2016]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  19

  19. CHECK DTC OUTPUT 
    1. Check the other DTCs that were output together with DTC P0A79-716.

      Result

      DTC No. Relevant Diagnosis
      P0A79-692, 693, 694, 695, 696, 712 Drive Motor "B" Inverter Performance
      NOTE:

      DTC P0A79-716 is stored after DTC P0A79-692, 693, 694, 695, 696 and/or 712 is stored. After troubleshooting and repairing the malfunction which caused DTC P0A79-716 to be stored, be sure to troubleshoot all the other DTCs.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [02/2014 - 11/2015]  Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2015 - 11/2016] 

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