P1204 – Capacitor Excessive Charging MMC L200 IV



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 JUDGEMENT

  • Ignition switch is in “ON” position
  • Except during the engine cranking period
  • Battery positive voltage is 8 V or more
  • 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 stored.
  • Q. Is the diagnosis code stored?

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