Traction Motor Inverter Insulation Resistance Check

TRACTION MOTOR INVERTER INSULATION RESISTANCE CHECK

Component Inspection


WARNING:
- Because hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.
- Be sure to remove the service plug in order to disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
- To prevent the removed service plug from being connected by mistake during the procedure, always carry it in your pocket or put it in the tool box.
- Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses before beginning work on the high voltage system.
- Clearly identify the persons responsible for high voltage work and ensure that other persons do not touch the vehicle. When not working, cover high voltage parts with an insulating cover sheet or similar item to prevent other persons from contacting them.
- Refer to "High Voltage Precautions" High Voltage Precautions.

CAUTION:
There is the possibility of a malfunction occurring if the vehicle is changed to READY status while the service plug is removed. Therefore do not change the vehicle to READY status unless instructed to do so in the Service Manual.

1. PRECONDITIONING


WARNING:
Disconnect high voltage circuit. Refer to "How to Disconnect High Voltage" Service and Repair.
Check the voltage in high voltage circuit. (Check that condenser are discharged.)
1.Lift up the vehicle and remove the li-ion battery under covers. Refer to "Exploded View" Service and Repair.
2.Disconnect the high voltage connector from front side of Li-ion battery. Refer to "Removal and Installation" Service and Repair.





3.Measure voltage between high voltage harness terminals.
DANGER:


Touching high voltage components without using the appropriate protective equipment will cause electrocution.
Standard: 5 V or less

CAUTION:
For voltage measurements, use a tester which can measure to 500 V or higher.
- GO TO 2.

2. CHECK TRACTION MOTOR INVERTER INSULATION RESISTANCE


WARNING:
Unlike the ordinary tester, the insulation resistance tester applies 500 V when measuring. If used incorrectly, there is the danger of electric shock. If used in the vehicle 12V system, there is the danger of damage to electronic devices. Read the insulation resistance tester instruction manual carefully and be sure to work safely.
1.Remove the traction motor inverter. Refer to "Removal and Installation"
2.Use 500V range of insulation resistance tester to measure insulation resistance. Wait for 30 seconds until the value becomes stable.

CAUTION:
Be sure to set the insulation resistance tester to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.










Is the inspection result normal?
YES- INSPECTION END
NO- Replace the traction motor inverter. Refer to "Removal and Installation".