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Home >> Lexus >> 2019 >> LS 500h RWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (W/O Advanced Park) - Diagnostic Codes (10 Of 10) & Circuit Tests (1 Of 2) >> HYBRID CONTROL SYSTEM (w/o Advanced Park) >> Generator Resolver Circuit [10/2017 - 10/2020] >> Procedure

Generator Resolver Circuit [10/2017 - 10/2020]: Procedure

  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 repair information because this may cause a malfunction.

    2. Disconnect the A94 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
      A94-21 (GRF) - Body ground Power switch on (IG) Below 1 V
      A94-14 (GRFG) - Body ground Power switch on (IG) Below 1 V
      A94-32 (GSN) - Body ground Power switch on (IG) Below 1 V
      A94-33 (GSNG) - Body ground Power switch on (IG) Below 1 V
      A94-35 (GCS) - Body ground Power switch on (IG) Below 1 V
      A94-34 (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.

      GTY782997Courtesy 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 A94 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 repair information because this may cause a malfunction.

    2. Disconnect the A94 inverter with converter 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
      A94-21 (GRF) - A94-14 (GRFG) Power switch off 5.9 to 12.1 Ω
      A94-32 (GSN) - A94-33 (GSNG) Power switch off 11.7 to 17.8 Ω
      A94-35 (GCS) - A94-34 (GCSG) Power switch off 11.7 to 17.8 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
      A94-21 (GRF) or A94-14 (GRFG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A94-32 (GSN) or A94-33 (GSNG) - Body ground and other terminals Power switch off 1 MΩ or higher
      A94-35 (GCS) or A94-34 (GCSG) - Body ground and other terminals Power switch off 1 MΩ or higher
      GTY782998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)
    4. Reconnect the A94 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 (GENERATOR RESOLVER CONNECTOR) 
    1. Check the connection condition of the generator 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 [10/2017 - ]

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in the connector.

      GTY835291Courtesy 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 TRANSMISSION ASSEMBLY (GENERATOR RESOLVER) 
    1. Disconnect the D38 resolver connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      D38-1 (GRF) - D38-7 (GRFG) Power switch off 5.7 to 11.6 Ω
      D38-2 (GSN) - D38-6 (GSNG) Power switch off 11.4 to 17.4 Ω
      D38-3 (GCS) - D38-5 (GCSG) Power switch off 11.4 to 17.4 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).)

      GTY784863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Generator resolver (Hybrid Vehicle Transmission Assembly))

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      D38-1 (GRF) - Body ground and other terminals (except D38-7 (GRFG)) Power switch off 1 MΩ or higher
      D38-7 (GRFG) - Body ground and other terminals (except D38-1 (GRF)) Power switch off 1 MΩ or higher
      D38-2 (GSN) - Body ground and other terminals (except D38-6 (GSNG)) Power switch off 1 MΩ or higher
      D38-6 (GSNG) - Body ground and other terminals (except D38-2 (GSN)) Power switch off 1 MΩ or higher
      D38-3 (GCS) - Body ground and other terminals (except D38-5 (GCSG)) Power switch off 1 MΩ or higher
      D38-5 (GCSG) - Body ground and other terminals (except D38-3 (GCS)) Power switch off 1 MΩ or higher
    3. Reconnect the D38 resolver connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY 

    for 2WD:

    Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020]

    for AWD:

    Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020]

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