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.

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. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - 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 ).