Code No. P0302: No. 2 Cylinder Misfire Detected




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment Criteria (change in the angular acceleration of the crankshaft is used for misfire detection).

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Visual check of ignition spark.



  • Remove the spark plug and install to the ignition coil.
  • Connect the ignition coil connector.
  • Remove all injector connectors.
  • At the engine start, check each spark plug procedure a spark.

Q. Is the check result normal?

Go to Step 2 .
Check ignition circuit system (Refer to Inspection Procedure 24 ).

STEP 2. Check connector: A-102 No. 2 injector connector



Q. Is the check result normal?

Go to Step 3 .

Repair or replace the connector.

STEP 3. Check No. 2 injector itself.



  • Check Injector itself (Refer to ).

Q. Is the check result normal?

Go to Step 4 .
Replace the No. 2 injector.

STEP 4. Connector check: B-206 engine control relay connector and A-08 engine-ECU connector or engine-A-M/T-ECU connector




Q. Is the check result normal?

Go to Step 5 .

Repair or replace the connector.

STEP 5.Check harness between B-206 (terminal No. 4) engine control relay connector and A-102 (terminal No. 1) No. 2 injector connector.




note Before checking harness, check intermediate connectors A-13 and B-212, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 6 .

Repair the damaged harness wire.

STEP 6. Check harness between A-102 (terminal No. 2) No. 2 injector connector and A-08 (terminal No. 9) engine-ECU connector or engine-A-M/T-ECU connector





  • Check earthing line for damage.

Q. Is the check result normal?

Go to Step 7 .

Repair the damaged harness wire.

STEP 7. Fuel pressure measurement.



  • Fuel pressure measurement (Refer to Fuel Pressure Test )

Q. Is the check result normal?

Go to Step 8 .
Repair the fuel pressure.

STEP 8. Check compression pressure.



  • Check compression pressure (Refer to GROUP 11C - On-vehicle Service - Compression Pressure Check ).

Q. Is the check result normal?

Go to Step 9 .
Repair the compression pressure.

STEP 9. M.U.T.-III diagnosis code.



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

Replace the engine-ECU or engine-A-M/T-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).





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