[Previous][Next]
DTC P1C00: DCDC Input Voltage Abnormal
 
 
 
 
TROUBLE JUDGMENT
Check Condition
  • The PHEV-ECU allows the DC-DC converter to operate.
Judgment Criterion
  • The input voltage is abnormal.
 
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • The output of DC-DC converter is stopped.
 
 
PROBABLE CAUSES
  • The high voltage fuse is melted down inside the REMCU.
  • Open circuit or harness damage in high voltage circuits between DC-DC converter and REMCU, or loose connector contact
  • The on board charger/DC-DC converter is failed.
  • Short to power supply in DCSW line between PHEV-ECU connector and on board charger/DC-DC converter connector
 
 
 
 
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. Using scan tool (M.U.T.-IIISE), check whether the other system DTC is set.
Is the DTC related to PHEV-ECU system set?
Check PHEV-ECU system (Refer to GROUP 54Da - PHEV-ECU - Diagnostic Trouble Code Chart ).
Go to Step 2.
 
STEP 2. Check of short to power supply circuit in DCSW line between PHEV-ECU connector and on board charger/DC-DC converter connector.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Perform the continuity check of the high voltage fuse inside the REMCU.
Check of the high-voltage fuse inside inverter (Refer to GROUP 54Db - Check and Replacement of the High-voltage Fuse inside the Inverter ).
Is the check result normal?
Go to Step 4.
Replace the high voltage fuse (Refer to GROUP 54Db - Check and Replacement of the High-voltage Fuse inside the Inverter ).
 
STEP 4. Check of open circuit and damage in P line and N line between on board charger/DC-DC converter connector and REMCU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. 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 ).