ELECTRIC MOTOR INSPECTION

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Warning

<<High voltage>>

•  If the necessary measures are not taken before servicing an electric vehicle, it could cause electrical shock and result in serious injury or, in the worst case, death. Before servicing the electric vehicle, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and implement the necessary measures. (See HIGH VOLTAGE SERVICE CAUTIONS.)

High Voltage Part Inspection And Removal/Installation Notes

Warning

<<High voltage>>

•  If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.

•  Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (See HIGH VOLTAGE SERVICE CAUTIONS.) (See HIGH VOLTAGE SYSTEM SERVICE CAUTIONS.)

Insulation Resistance Inspection

Caution

•  Because the electric motor is hot after driving, the electric motor resistance value does not become a value according to the ambient temperature. Therefore, leave the vehicle for 1 day or more after driving and perform the inspection with a stable electric motor internal temperature.

1.  Leave the vehicle for 1 day or more.

2.  Wear insulating gloves and remove the inverter.

(See INVERTER REMOVAL/INSTALLATION.)

Warning

<<High voltage>>

•  For the insulation resistance tester usage, refer to the insulation resistance tester instruction manual. Otherwise, electrocution could result from the voltage generated by the insulation resistance tester.

Caution

<<High voltage>>

•  Use an insulation resistance tester using a testing range of 500 V or less because the voltage applied by the insulation resistance tester may damage the parts.

3.  Wear insulating gloves and measure the insulation resistances between the following each phase terminal of the electric motor and the electric motor case using the insulation resistance tester (500 V range).

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•  If the value is not within the standard, wear insulating gloves and replace the electric motor. (See ELECTRIC MOTOR REMOVAL/INSTALLATION.)

Continuity Inspection

Caution

•  Because the electric motor is hot after driving, the electric motor resistance value does not become a value according to the ambient temperature. Therefore, leave the vehicle for 1 day or more after driving and perform the inspection with a stable electric motor internal temperature.

1.  Leave the vehicle for 1 day or more.

2.  Wear insulating gloves and remove the inverter.

(See INVERTER REMOVAL/INSTALLATION.)

3.  Measure the resistance values between the following electric motor phases using the milliohm tester.

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Note

•  Adjust the measured value to a resistance value (R20) at 20 °C {68 °F}using the following formula.

R20 = Rt / (1 + 0.00393 × (T-20))

R20: resistance value (mΩ) at 20 °C {68 °F}, Rt: measured value (mΩ), T: temperature (°C {°F}) at time of measurement

•  If the value is not within the standard, wear insulating gloves and replace the electric motor. (See ELECTRIC MOTOR REMOVAL/INSTALLATION.)