LEMON Manuals: Even more car manuals for everyone
Home >> Honda >> 2013 >> Fit Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P0300, P0301, P0302, P0303, P0304: Random Misfire and Any Combination of the Following: No. 1 Cylinder Misfire Detected; No. 2 Cylinder Misfire Detected; No. 3 Cylinder Misfire Detected; No. 4 Cylinder Misfire Detected >> Special Tools Required

Special Tools Required

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
  • If the misfire is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0304) will be stored.
  • If the misfire is frequent enough to damage the catalyst, the MIL will flash whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0304) will be stored. When the misfire stops, the MIL will remain on.
  • If any of the DTCs listed below are indicated at the same time as the random misfire DTCs, troubleshoot those DTCs first, then recheck for random misfire DTCs:

    P0101, P0102, P0103: Mass airflow (MAF) sensor

    P0107, P0108: Manifold absolute pressure (MAP) sensor

    P0171, P0172: Fuel system

    P0335, P0339: Crankshaft position (CKP) sensor

    P0365, P0369: Camshaft position (CMP) sensor

    P0506, P0507: Idle control system

    P2646, P2647, P2648, P2649: VTEC system

  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 (A/T 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 screen indicate FAILED? 

    YES:  Go to step  9.

    NO:  If the HDS indicates PASSED, go to step  5. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, wait for several minutes, then recheck.

  5. 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 step  9.

    NO:  Go to step  6.

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

    Does the screen indicate FAILED? 

    YES:  Go to step  9.

    NO:  If the HDS indicates PASSED, go to step  8. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, go to step  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 step  9.

    NO:  Intermittent failure, the system is OK at this time.

  9. Turn the ignition switch to LOCK (0).
  10. Check the fuel quality.

    Is the quality good? 

    YES:  Go to step  11.

    NO:  Drain the tank and fill with a known-good fuel, then go to step  24.

  11. Inspect the spark plugs (see SPARK PLUG INSPECTION ). If the spark plugs are fouled or worn, replace them.
  12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
  13. 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 step  14.

    NO  Go to step  24.

  14. Check the fuel pressure (see FUEL PRESSURE TEST ).

    Is the fuel pressure OK? 

    YES:  Go to step  15.

    NO: 

  15. Start the engine. Hold the engine speed at 3, 000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  16. Check under these conditions:
    • Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C)
    • A/T in P or N, M/T in neutral
    • All electrical loads off
  17. Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2, 500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds.

    Did the engine speed vary more than 100 rpm from 2, 500 rpm? 

    YES:  Repeat step  17.

    NO:  Go to step  18.

  18. While holding the engine speed at 2, 500 rpm, check the MAF SENSOR in the DATA LIST with the HDS.

    Is there about 4.6-5.7 gm/s (M/T), 4.7-5.7 gm/s (A/T)? 

    YES:  Go to step  19.

    NO:  Replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT  ), then go to step  24.

  19. Turn the ignition switch to LOCK (0).
  20. Remove the rocker arm oil pressure switch.
  21. Attach the special tools to the rocker arm oil control valve as shown, then attach the rocker arm oil pressure switch (A) in the pressure gauge adapter (B).
    Fig 1: Attaching Special Tools To Rocker Arm Oil Control Valve
    G05952879Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Start the engine. Hold the engine speed at 3, 000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  23. Check the oil pressure at engine speeds of 1, 000 rpm and 2, 000 rpm.

    Is the oil pressure below 49 kPa (0.5 kgf/cm 2  , 7 psi)? 

    YES:  Go to step  24.

    NO:  Inspect the VTEC system, then go to step  24.

  24. Turn the ignition switch to ON (II).
  25. Reset the ECM/PCM with the HDS.
  26. Clear the CKP pattern with the HDS.
  27. Do ECM/PCM IDLE LEARN PROCEDURE .
  28. Do CKP PATTERN CLEAR/CKP PATTERN LEARN .
  29. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
  30. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0300, 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 P0301, P0302, P0303, or P0304 (see DTC P0301, P0302, P0303, P0304: NO. 1 CYLINDER MISFIRE DETECTED; NO. 2 CYLINDER MISFIRE DETECTED; NO. 3 CYLINDER MISFIRE DETECTED; NO. 4 CYLINDER MISFIRE DETECTED  ).

    NO:  Go to step  31.

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

    Does the screen indicate PASSED? 

    YES:  Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  30, go to the indicated DTC's troubleshooting.

    NO:  If the HDS indicates FAILED, go to step  1 and recheck. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, go to step  29.

scientia non olet · About LEMON Manuals