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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> ('12 Model) DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected

('12 Model) DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information(see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine, and let it idle without load (CVT in P or N, M/T in neutral).
  4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.

    Does the HDS indicate FAILED? 

    YES  - Go to  9.

    NO  - If the HDS indicates PASSED, go to  5. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, wait for several minutes, and recheck.

  5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    YES  - Go to  9.

    NO  - Go to  6.

  6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
    • ECT SENSOR 1
  7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS

    Does the HDS indicate FAILED? 

    YES  - Go to  9.

    NO  - If the HDS indicates PASSED, go to  8. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to  6 and recheck.

  8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS

    Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    YES  - Go to  9.

    NO  - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals in the fuel system circuit.

  9. Turn the ignition switch to LOCK (0).
  10. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  11. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
    • ECT SENSOR 1
  12. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    YES  - Go to  13.

    NO  - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Check for poor connections or loose terminals at the ignition coil.

  13. Determine which cylinder had the misfire.

    Does the misfire occur in the cylinder where the ignition coil was exchanged? 

    YES  - Replace the faulty ignition coil (see IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION , then go to  27.

    NO  - Go to  14.

  14. Turn the ignition switch to LOCK (0).
  15. Exchange the spark plug from the problem cylinder with one from another cylinder.
  16. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
    • ECT SENSOR 1
  17. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    YES  - Go to  18.

    NO  - Intermittent misfire due to spark plug fouling (no misfire at this time).

  18. Determine which cylinder had the misfire.

    YESDoes the misfire occur in the cylinder where the spark plug was exchanged? 

    YES  - Replace the faulty spark plug, then go to  27.

    NO  - Go to  19.

  19. Turn the ignition switch to LOCK (0).
  20. Exchange the injector from the problem cylinder with one from the another cylinder.
  21. Start the engine, and let it idle for 2 minutes.
  22. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
    • ECT SENSOR 1
  23. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    YES  - Go to  24.

    NO  - Intermittent misfire due to bad contact at the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.

  24. Determine which cylinder had the misfire.

    Does the misfire occur in the cylinder where the injector was exchanged? 

    YES  - Replace the faulty injector (see Injector Replacement ), then go to  27.

    NO  - Go to  25.

  25. Do an engine compression and a cylinder leakdown test (see ENGINE COMPRESSION INSPECTION ).

    Did the engine pass both tests? 

    YES  - Go to  26.

    NO  - Repair the engine, then go to  27.

  26. Do the VTEC rocker arm test (see VTEC ROCKER ARM TEST ).

    Did the engine pass the test? 

    YES  - Check for wear or damage to these parts. If needed, repair or replace part(s), then go to  27.

    • Cylinder head
    • Carbon in the intake manifold
    • Valve seal
    • Piston ring
    • Intake and exhaust valve
    • Cam chain
    • Valve guide
    • Piston

    NO  - Repair the VTEC rocker arm (see ROCKER ARM ASSEMBLY REMOVAL ), then go to  27.

  27. Turn the ignition switch to LOCK (0).
  28. Install the parts in the reverse order of removal.
  29. Turn the ignition switch to ON (II).
  30. Reset the ECM/PCM with the HDS.
  31. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  32. Do the CKP pattern clear/CKP pattern learn procedure (see CKP PATTERN CLEAR/CKP PATTERN LEARN ).
  33. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
    • ECT SENSOR 1
  34. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0301, P0302, P0303, or P0304 indicated? 

    YES  - Check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM/PCM, then go to the troubleshooting for DTC P0300, P0301, P0302, P0303, or P0304 (see DTC P0300: Random Misfire (75*5 211*4) and Any Combination of the Following: DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected ).

    NO  - Go to (see  35).

  35. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  - Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  34, go to the indicated DTC's troubleshooting.

    NO  - If the HDS indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM/PCM, then go to  1. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to  33.

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