Code No. P1C04: DCDC No Power Generation




TROUBLE JUDGEMENT


Check Condition
  • The PHEV-ECU allows the DC-DC converter to operate.
Judgement Criterion
  • The output (B-terminal) voltage is lower or equal to the specified voltage.

FAIL-SAFE AND BACKUP FUNCTION



  • The output of the DC-DC converter continues.

PROBABLE CAUSE



  • Open circuit or harness damage in output (+B terminal) voltage circuit, or loose connector contact
  • The auxiliary battery is deteriorated.
  • The on board charger/DC-DC converter is failed.

DIAGNOSIS PROCEDURE


STEP 1. Auxiliary battery condition check


Q. Is the installation status of the auxiliary battery terminal abnormal?

Go to Step 2.
Repair.

STEP 2. Perform the continuity check of the fuse between the on board charger/DC-DC converter (+B terminal) connector and the auxiliary battery.



  • Perform the continuity check of the fuse.
OK: Continuity

Q. Is the check result normal?

Go to Step 3.
Replace the fuse. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Inspection Service Points For A Blown Fuse )

STEP 3. Check of open circuit and damage in +B line between on board charger/DC-DC converter connector and auxiliary battery.


Q. Is the check result normal?

Go to Step 4.
Repair the connector(s) or wiring harness.

STEP 4. M.U.T.-III diagnosis code.



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code stored?

Replace the on board charger/DC-DC converter.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).