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Generator Resolver Circuit [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) 
    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the C89 inverter with converter assembly connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C89-8 (GRF) - Body ground Power switch on (IG) Below 1 V
      C89-9 (GRFG) - Body ground Power switch on (IG) Below 1 V
      C89-10 (GSN) - Body ground Power switch on (IG) Below 1 V
      C89-11 (GSNG) - Body ground Power switch on (IG) Below 1 V
      C89-13 (GCS) - Body ground Power switch on (IG) Below 1 V
      C89-12 (GCSG) - Body ground Power switch on (IG) Below 1 V
      NOTE:

      Turning the power switch on (IG) with the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      GTY806385Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    6. Turn the power switch off.
    7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 2 minutes or more.
    8. Reconnect the C89 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK GENERATOR RESOLVER 
    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the C89 inverter with converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C89-8 (GRF) - C89-9 (GRFG) Power switch off 8.9 to 14.8 Ω
      C89-10 (GSN) - C89-11 (GSNG) Power switch off 22.6 to 34.5 Ω
      C89-13 (GCS) - C89-12 (GCSG) Power switch off 25.5 to 37.4 Ω

      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).)

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      C89-8 (GRF) or C89-9 (GRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      C89-10 (GSN) or C89-11 (GSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      C89-13 (GCS) or C89-12 (GCSG) - Body ground and other terminals Power switch off 1 MΩ or higher
      C89-7 (DRN3) - Other terminals Power switch off 1 MΩ or higher
      GTY946676Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    4. Reconnect the C89 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GENERATOR RESOLVER CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC) 

    Result: 

    NG 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (RESOLVER CONNECTOR) 
    1. Check the connection condition of the resolver 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 [06/2018 - ]

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in the connector.

      GTY766707Courtesy 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. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR RESOLVER) 
    1. Disconnect the C91 resolver connector.
      GTY821514Courtesy 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
      C91-1 (GRF) - C91-8 (GRFG) Power switch off 8.8 to 14.8 Ω
      C91-12 (GSN) - C91-2 (GSNG) Power switch off 22.5 to 34.4 Ω
      C91-7 (GCS) - C91-11 (GCSG) Power switch off 25.5 to 37.3 Ω

      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).)

      GTY793027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Generator resolver (Hybrid Vehicle Transaxle Assembly))

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      C91-1 (GRF) - Body ground and other terminals (except C91-8 (GRFG)) Power switch off 1 MΩ or higher
      C91-8 (GRFG) - Body ground and other terminals (except C91-1 (GRF)) Power switch off 1 MΩ or higher
      C91-12 (GSN) - Body ground and other terminals (except C91-2 (GSNG)) Power switch off 1 MΩ or higher
      C91-2 (GSNG) - Body ground and other terminals (except C91-12 (GSN)) Power switch off 1 MΩ or higher
      C91-7 (GCS) - Body ground and other terminals (except C91-11 (GCSG)) Power switch off 1 MΩ or higher
      C91-11 (GCSG) - Body ground and other terminals (except C91-7 (GCS)) Power switch off 1 MΩ or higher
    3. Reconnect the C91 resolver connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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