The PHEV-ECU allows the DC-DC converter to operate.
Judgment Criterion
The temperature of the inside temperature sensor, the DCDC rectification temperature sensor, the DCDC inverter temperature sensor 1 or the DCDC inverter temperature sensor is lower or equal to the specified temperature.
FAIL-SAFE AND BACKUP FUNCTION
The output of DC-DC converter is stopped.
PROBABLE CAUSE
The ambient temperature is extremely low.
The DC-DC converter is failed.
DIAGNOSIS
Required Special Tools
MB991223: Wiring harness set
MB992006: Extra fine probe
STEP 1. Check the ambient temperature.
Is the ambient temperature extremely low?
Check again under the condition the ambient temperature is not extremely low.
Go to Step 2.
STEP 2. Using scan tool (M.U.T.-IIISE), check on board charger/DC-DC converter data list.
Data List Reference Table (Refer to ).
Item No.41: Inside temperature
Item No.55: DCDC inverter temperature 1
Item No.56: DCDC rectification temperature
Item No.57: DCDC inverter temperature 2
Are the check result normal?
Go to Step 3.
Replace the on board charger/DC-DC converter (Refer to ).
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Is the DTC set?
Replace the on board charger/DC-DC converter (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).