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Inspection Procedure 11: Domestic Circuit Breaker Interrupts the Power Supply.
 
 
 
 
PROBABLE CAUSES
  • Simultaneous use with other household electric appliances in the home
  • The charging cable is failed.
  • The on board charger/DC-DC converter is failed.
 
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
dangerWhen high voltage system components are served, be sure to pull service plugs to shut down high voltage (Refer to ).
dangerWhen pulling service plugs, wear the specified protective equipment (Refer to ).
STEP 1. Check the AC power supply.
Is the AC power supply using for the charging also used for other home electric appliances?
Stop using the AC power supply for other home electric appliances.
Go to Step 2.
 
STEP 2. Check the current capacity of the power supply system for home use.
  • Check whether the current capacity is lower than the charging circuit interrupting device limited current of the EV charging cable (normal charging).
Is the check result normal?
Go to Step 3.
Check the power supply system for home use.
 
STEP 3. Check charging cable itself
  • Check Charging Cable (Refer to ).
Is the check result normal?
Go to Step 4.
Replace the charging cable.
 
STEP 4. Check the normal charging connector for the insulation resistance.
dangerWhen high voltage system components are serviced, be sure to pull service plugs to shut down high voltage before serving (Refer to ).
dangerWhen pulling service plugs, wear the specified protective equipment (Refer to ).
cautionWhen the insulation resistance is measured, set the range of the special tool electric insulation tester (MB992355) to 500 volts. When the insulation resistance is measured at the range more than 500 volts, the component may be damaged.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Disconnect the on board charger/DC-DC converter connector.
(3) Use the special tool electric insulation tester (MB992355) to set the range to 500 volts.
(4) Check the insulation resistance between normal charging connector (COLD line and HOT line) and body ground.
OK: 10 MΩ or more
Is the check result normal?
Go to Step 5.
Replace the harness between normal charging connector (COLD line and HOT line) and on board charger/DC-DC converter connector.
 
STEP 5. Check the on board charger/DC-DC converter for the insulation resistance.
  • Check the on board charger/DC-DC converter for the insulation resistance (Refer to ).
Is the check result normal?
Go to Step 6.
Replace the on board charger/DC-DC converter (Refer to ).
 
STEP 6. After replacing the on board charger/DC-DC converter, check the malfunction phenomenon
  • After replacing the on board charger/DC-DC converter, the malfunction phenomenon reoccurs or not.
Does the trouble symptom persist?
Check the power supply system for home use (ground leakage).
Check end.