Code No. P1204: Capacitor Excessive Charging


FUNCTION



  • The engine-ECU monitors the charged state of the capacitor in the injector drive circuit.
  • The engine-ECU checks whether the injector driving voltage is too high due to excessive charging of the capacitor.

TROUBLE JUDGMENT


Check Conditions
  • Ignition switch is in "ON" position
  • Except during the engine cranking period
  • Battery positive voltage is 8 V or more
Judgment Criterion
  • A capacitor in overcharge state (100 V or higher) is detected in an engine-ECU internal circuit.

PROBABLE CAUSE



  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • After erasing the diagnosis code through M.U.T.-III, ignition switch is "ON" position and confirm whether the diagnosis code is output.

Q. Is the diagnosis code set?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).