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Home >> Honda >> 2007 >> Element SC, Standard >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P0300: Random Misfire 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

DTC P0300: Random Misfire 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

Special Tools Required 

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see 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 of the combination of P0301 through P0304)will be stored.
  • If the misfire is frequent enough to damage the catalyst, the MIL will blink whenever the misfire occurs, and DTC P0300 (and some of the 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 these random misfire DTCs:

P0101, P0102, P0103: Mass air flow (MAF) sensor

P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor

P0171, P0172: Fuel system

P0335, P0339: Crankshaft position (CKP) sensor

P0365, P0369: Camshaft position (CMP) sensor B

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/Tin 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 screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, wait 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 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 screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, 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, fill it 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 several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • 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  25.

  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 T (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 6.4- 9.2 gm/s? 

    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 (A), and attach the special tools as shown, then attach the rocker arm oil pressure switch to the pressure gauge adapter (B).
    NOTE: Install the parts in the reverse order of removal with a new O-ring.
    Fig 1: Removing Rocker Arm Oil Pressure Switch
    G06267388Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Reconnect the rocker arm oil pressure switch 2P connector.
  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 the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  28. Do the CKP pattern learn procedure (see CRANK (CKP) PATTERN CLEAR/CRANK (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 Temporary DTCs or DTCs with the HDS.

    Is DTC P0300, P0301, P0302, P0303, or P0304 indicated? 

    YES  -Check for poor connections or loose terminals at the ignition coil(s), the injector(s), and the ECM/PCM, then go to DTC P0301, P0302, P0303, or P0304 troubleshooting (see 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 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 Temporary DTCs or DTCs were indicated in step  30, go to the indicated DTCs troubleshooting.

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil(s), the injector(s), and the ECM/PCM, then go to step  1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  29.

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