HYBRID CONTROL SYSTEM Motor High-voltage Circuit

Info Added 2017-10-06

DESCRIPTION

The cause of the malfunction may be the high-voltage circuit of the motor.

Check the motor internal resistance and the connection condition of the high-voltage line between the inverter and motor to check whether there is an open or short circuit.

Related Parts Check
Area Inspection
Motor cable connection check Check for open or short circuit in the connection condition of the cable from the inverter to the motor.
Motor and motor cable Check the motor (including cable) internal resistance and insulation resistance with body ground to check for an open or short circuit.

WIRING DIAGRAM

A005NWIE51
*a Hybrid Vehicle Transaxle Assembly (Motor (MG2))
*b Inverter with Converter Assembly
*c High Voltage Line

CAUTION / NOTICE / HINT

This step is referenced from the procedures for each DTC.

If the inspection results below are normal, perform the next procedure for the referenced DTC.

CAUTION:


  • B0048QQ

    Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.


    • Inspecting the high-voltage system

    • Disconnecting the low voltage connector of the inverter with converter assembly

    • Disconnecting the low voltage connector of the HV battery


  • A005NJP

    To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.


  • A005NAH

    After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.


  • B0048M5C01
    *a Without waiting for 10 minutes

    After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

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    Tech Tips

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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PROCEDURE


  1. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)

    CAUTION:

    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 manual because this may cause a malfunction.

    2. Remove the inverter cover from the inverter with converter assembly.

    3. A001PKD

      Check that the bolts for the motor cable are tightened to the specified torque, the motor cable is connected securely, and there are no contact problems.

      Specified Condition
      T = 8.0 N*m (82 kgf*cm, 71 in.*lbf)

    4. Disconnect the motor cable from the inverter with converter assembly.

    5. Check for arc marks at the terminals for the motor cable.

      Result
      Result Proceed to
      The terminals are connected securely and there are no contact problems. There are no arc marks. A
      The terminals are not connected securely and there is a contact problem. There are arc marks. B
      The terminals are not connected securely and there is a contact problem. There are no arc marks. C
      The terminals are connected securely and there are no contact problems. There are arc marks. B

    6. Connect the motor cable to the inverter with converter assembly.

    7. Install the inverter cover.


    B

    REPLACE MALFUNCTIONING PARTS

    C

    CONNECT SECURELY

    A

  2. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR (MG2))

    CAUTION:

    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 manual because this may cause a malfunction.

    2. Remove the inverter cover from the inverter with converter assembly.

    3. Disconnect the motor cable from the inverter with converter assembly.

    4. A005MYQC17
      *1 Shield Ground
      *a

      Motor Cable

      (Inverter with Converter Assembly Side)

      Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

      Tech Tips

      If the motor (MG2) 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
      i2-1 (W) - i2-2 (U) Power switch off 102.2 to 112.6 mΩ
      i2-2 (U) - i2-3 (V) Power switch off 102.2 to 112.6 mΩ
      i2-3 (V) - i2-1 (W) Power switch off 102.6 to 113.0 mΩ

      Tech Tips

      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).)

    5. 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
      i2-1 (W) - Body ground and shield ground Power switch off 10 MΩ or higher
      i2-2 (U) - Body ground and shield ground Power switch off 10 MΩ or higher
      i2-3 (V) - Body ground and shield ground Power switch off 10 MΩ or higher

    6. Reconnect the motor cable.

    7. Install the inverter cover.

      Result
      Proceed to
      OK
      NG

    OK

    MOTOR HIGH-VOLTAGE CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC)

    NG

  3. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)

    CAUTION:

    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 manual because this may cause a malfunction.

    2. A001QXK

      Check that the bolts for the motor cable are tightened to the specified torque, the motor cable is connected securely, and there are no contact problems.

      Specified Condition
      T=10 N*m (102 kgf*cm, 7 ft.*lbf)

    3. Disconnect the motor cable from the hybrid vehicle transaxle assembly.

    4. Check for arc marks at the terminals for the generator cable.

      Result
      Result Proceed to
      The terminals are connected securely and there are no contact problems. There are no arc marks. A
      The terminals are not connected securely and there is a contact problem. There are arc marks. B
      The terminals are not connected securely and there is a contact problem. There are no arc marks. C
      The terminals are connected securely and there are no contact problems. There are arc marks. B

    5. Connect the motor cable to the hybrid vehicle transaxle assembly.


    B

    REPLACE MALFUNCTIONING PARTS

    C

    CONNECT SECURELY

    A

  4. CHECK MOTOR CABLE (FOR MG2)

    CAUTION:

    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 manual because this may cause a malfunction.

    2. Remove the motor cable.

    3. 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.

      A005N0IC09
      *1 Shielded Ground *a Motor Cable
      Standard Resistance
      Tester Connection Condition Specified Condition
      i2-1 (W) or i1-6 (W) - Body ground and shield ground Power switch off 10 MΩ or higher
      i2-2 (U) or i1-5 (U) - Body ground and shield ground Power switch off 10 MΩ or higher
      i2-3 (V) or i1-4 (V) - Body ground and shield ground Power switch off 10 MΩ or higher

      Note

      Wrap the terminal of the generator cable with insulating tape to prevent them from coming into contact with body ground.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      i2-1 (W) - i1-6 (W) Power switch off Below 1 Ω
      i2-2 (U) - i1-5 (U) Power switch off Below 1 Ω
      i2-3 (V) - i1-4 (V) Power switch off Below 1 Ω
      i2-1 (W) - i1-5 (U) Power switch off 10 MΩ or higher
      i2-2 (U) - i1-4 (V) Power switch off 10 MΩ or higher
      i2-3 (V) - i1-6 (W) Power switch off 10 MΩ or higher

    5. Install the motor cable.

      Result
      Result
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    NG

    REPLACE MOTOR CABLE Click here