Code No. P0301: No. 1 Cylinder Injector Malfunction (No Injection)


FUNCTION



  • The engine-ECU, by monitoring the variation in the engine revolution, detects the non-fuel injection state.

TROUBLE JUDGMENT


Check Conditions
  • During the normal engine operation
  • Engine coolant temperature is 80°C or higher.
  • Crank angle sensor is normal.
Judgment Criterion
  • The variation in the engine revolution is more than the specified value.

PROBABLE CAUSES



  • Failed No. 1 injector
  • No. 1 fuel injection pipe clogged
  • Failed engine-ECU

DIAGNOSIS PROCEDURE
caution A high-tension voltage is flowing between the engine-ECU and the injectors while the engine is running. Handle them carefully to avoid receiving electric shocks from the voltage.

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

  • After erasing the diagnosis code through M.U.T.-III, operate the engine in the warm-up state and confirm and confirm whether the diagnosis code is output.

Q. Is the diagnosis code set?
Go to Step 2 .
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 2. Check for No. 1 fuel injection pipe clogged

  • Remove the No. 1 fuel injection pipe.
  • Check whether No. 1 fuel injection pipe is clogged or not.

Q. Is it clogged?
Clean or replace the No. 1 fuel injection pipe.
Replace the No. 1 injector. After replacing the injector, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns). Then go to Step 3 .

STEP 3. M.U.T.-III diagnosis code

  • After erasing the diagnosis code through M.U.T.-III, operate the engine in the warm-up state and confirm 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 - 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 ). After registering the injector identification code, the vehicle equipped with the closed type DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).
The check is end.