Code No. P1203: Capacitor Insufficient 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 low due to insufficient 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 low charge state (40 V or less) is detected in an engine-ECU internal circuit.

FAIL-SAFE AND BACKUP FUNCTION



  • The rail pressure is controlled in the range between 50 and 100 MPa.
  • The fuel injection amount is restricted (Output restriction).
  • The open angle of the accelerator pedal is restricted.
  • The EGR control is stopped (fully closed).
  • The DPF regeneration is prohibited.
  • The AS&G control is prohibited.

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 set.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).