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Motor Resolver Circuit [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (HYBRID MOTOR CONTROL INVERTER ASSEMBLY - MOTOR RESOLVER) 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

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

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Disconnect the hybrid motor control inverter assembly connector.
      GTY1203767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Connect the cable to the negative (-) auxiliary battery terminal.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B81-5 (MRF) - Body ground Ignition switch ON Below 1 V V
      B81-6 (MRFG) - Body ground Ignition switch ON Below 1 V V
      B81-1 (MSN) - Body ground Ignition switch ON Below 1 V V
      B81-2 (MSNG) - Body ground Ignition switch ON Below 1 V V
      B81-4 (MCS) - Body ground Ignition switch ON Below 1 V V
      B81-3 (MCSG) - Body ground Ignition switch ON Below 1 V V
      GTY1204482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Motor Control Inverter Assembly)
      NOTE:

      Turning the ignition switch to ON with the hybrid motor control inverter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 2 minutes or more.
    • Reconnect the hybrid motor control inverter assembly connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK MOTOR RESOLVER 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

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

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Disconnect the hybrid motor control inverter assembly connector.
      GTY1203767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B81-5 (MRF) - B81-6 (MRFG) Ignition switch off 8.9 to 14.9 Ω Ω
      B81-1 (MSN) - B81-2 (MSNG) Ignition switch off 16.2 to 28.1 Ω Ω
      B81-4 (MCS) - B81-3 (MCSG) Ignition switch off 18.2 to 30.1 Ω 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 Result
      B81-5 (MRF) or B81-6 (MRFG) - Body ground and other terminals Ignition switch off 1 MΩ or higher MΩ
      B81-1 (MSN) or B81-2 (MSNG) - Body ground and other terminals Ignition switch off 1 MΩ or higher MΩ
      B81-4 (MCS) or B81-3 (MCSG) - Body ground and other terminals Ignition switch off 1 MΩ or higher MΩ
      B81-7 (DRN3) - Other terminals Ignition switch off 1 MΩ or higher MΩ
      GTY1204712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Motor Control Inverter Assembly)

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid motor control inverter assembly connector.

    Result: 

    OK 

    MOTOR 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.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

      GTY1204187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  4

  4. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR RESOLVER) 

    Pre-procedure1

    • Disconnect the resolver connector.
      GTY1204187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.
      GTY1206043Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Motor Resolver (Hybrid Vehicle Transaxle Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B83-6 (MRF) - B83-9 (MRFG) Ignition switch off 8.8 to 14.8 Ω Ω
      B83-4 (MSN) - B83-5 (MSNG) Ignition switch off 16.2 to 28.0 Ω Ω
      B83-10 (MCS) - B83-14 (MCSG) Ignition switch off 18.1 to 30.0 Ω 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 Result
      B83-6 (MRF) - Body ground and other terminals (except B83-9 (MRFG)) Ignition switch off 1 MΩ or higher MΩ
      B83-9 (MRFG) - Body ground and other terminals (except B83-6 (MRF)) Ignition switch off 1 MΩ or higher MΩ
      B83-4 (MSN) - Body ground and other terminals (except B83-5 (MSNG)) Ignition switch off 1 MΩ or higher MΩ
      B83-5 (MSNG) - Body ground and other terminals (except B83-4 (MSN)) Ignition switch off 1 MΩ or higher MΩ
      B83-10 (MCS) - Body ground and other terminals (except B83-14 (MCSG)) Ignition switch off 1 MΩ or higher MΩ
      B83-14 (MCSG) - Body ground and other terminals (except B83-10 (MCS)) Ignition switch off 1 MΩ or higher MΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the resolver connector.

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  REMOVAL [08/2023 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

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