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Home >> Honda >> 2015 >> Pilot EX, FWD >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> 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 P0305: No. 5 Cylinder Misfire Detected; DTC P0306: No. 6 Cylinder Misfire Detected

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 P0305: No. 5 Cylinder Misfire Detected; DTC P0306: No. 6 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 for 2 minutes (in P or N).
  4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS.

    Does the HDS 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, wait for several minutes, then recheck.

  5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 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
    • VEHICLE SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • GEAR POSITION
    • ECT SENSOR 1
  7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS.

    Does the HDS 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, go to step  6.

  8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? 

    YES  -Go to step 9.

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

  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)
    • GEAR POSITION
    • ECT SENSOR 1
  12. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? 

    YES  -Go to step 13.

    NO  -Intermittent failure due to poor contact at an ignition coil contactor (no misfire at this time). Make sure that the ignition coil connectors are secure.

  13. Determine which cylinder had the misfire.

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

    YES  -Replace the faulty ignition coils (see IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION ), then go to step 44.

    NO  -Go to step 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)
    • GEAR POSITION
    • ECT SENSOR 1
  17. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? 

    YES  -Go to step 18.

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

  18. Determine which cylinder had the misfire.

    Does the misfire occur in the cylinder where the spark plug was moved? 

    YES  -Replace the faulty spark plug (see IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION ), then go to step  44.

    NO  -Go to step 19.

  19. Turn the ignition switch to LOCK (0).
  20. Jump the SCS line with the HDS.
  21. Disconnect PCM connector B (49P).
  22. Remove the intake manifold (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ).
  23. Turn the ignition switch to ON (II).
  24. Measure the voltage between body ground and the appropriate PCM connector terminal (see table).
    PCM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 GRN
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 TAN
    No. 5 P0305 B5 PNK
    No. 6 P0306 B9 LT BLU
    Fig 1: Measuring Voltage Between Body Ground And PCM Connector B (49P) Terminals No. 4, 8 And 9
    G08079057Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Measuring Voltage Between Body Ground And PCM Connector B (49P) Terminals No. 5, 6 And 7
    G08079058Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  32.

    NO  -Go to step 25.

  25. Turn the ignition switch to LOCK (0).
  26. Disconnect the injector 2P connector from the problem cylinder.
  27. Turn the ignition switch to ON (II).
  28. Measure the voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 3: Measuring Voltage Between Injector 2P Connector Terminal No. 1 And Body Ground
    G08079059Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 29.

    NO  -Repair an open in the wire between the injector and PGM-FI main relay 1, then go to step  44.

  29. Turn the ignition switch to LOCK (0).
  30. Check for continuity between body ground and the PCM connector terminal (see table).
    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 GRN
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 TAN
    No. 5 P0305 B5 PNK
    No. 6 P0306 B9 LT BLU
    Fig 4: Checking Continuity Between Body Ground And PCM Connector B (49P) Terminals No. 4, 8 And 9
    G08079060Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 5: Checking Continuity Between Body Ground And PCM Connector B (49P) Terminals No. 5, 6 And 7
    G08079061Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM and the injector, then go to step  44.

    NO  -Go to step 31.

  31. Check for continuity between appropriate injector 2p connector terminal No. 2 and the PCM connector terminal of the problem cylinder (see table).
    INJECTOR 2P CONNECTOR TERMINAL NO. 2 AND PCM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 GRN
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 TAN
    No. 5 P0305 B5 PNK
    No. 6 P0306 B9 LT BLU
    Fig 6: Checking Continuity Between Injector 2P Connector Terminal No. 2 And PCM Connector B (49P) Terminals
    G08079062Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 7: Checking Continuity Between Injector 2P Connector Terminal No. 2 And PCM Connector B (49P) Terminals
    G08079063Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check for poor connections or loose terminals at the injector and PGM-FI main relay 1, then go to step 32.

    NO  -Repair an open in the wire between the PCM and the injector, then go to step  44.

  32. At the injector side, measure the resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 8: Measuring Resistance Between Injector 2P Connector Terminals No. 1 And 2
    G08079064Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 Ω? 

    YES  -Go to step 33.

    NO  -Replace the injector (see INJECTOR REPLACEMENT  ), then go to step  44.

  33. Exchange the injector from the problem cylinder with one from another cylinder. Also check the injector fuel inlet screen for debris, and clean it if needed.
  34. Reconnect all connectors, and reinstall the intake manifold (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ).
  35. Turn the ignition switch to ON (II).
  36. Clear the DTCs with the HDS.
  37. Start the engine, and let it idle without load (in P or N) for 2 minutes.
  38. 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)
    • GEAR POSITION
    • ECT SENSOR 1
  39. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? 

    YES  -Go to step 40.

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

  40. Determine which cylinder had the misfire.

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

    YES  -Replace the faulty injector (see INJECTOR REPLACEMENT  ), then go to step  44.

    NO  -Go to step 41.

  41. Turn the ignition switch to LOCK (0).
  42. Do an engine compression and a cylinder leakdown test (see ENGINE COMPRESSION INSPECTION ).

    Did the engine pass both tests? 

    YES  -Go to step 43.

    NO  -Repair the engine, then go to step  44.

  43. Do the VCM rocker arm test (see ROCKER ARM AND SHAFT INSPECTION ).

    Did the engine pass the test? 

    YES  -Go to step  51.

    NO  -Repair the VCM rocker arm, then go to step 44.

  44. Reconnect all connectors.
  45. Reset the PCM with the HDS.
  46. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  47. Do the CKP pattern clear/CKP pattern learn procedure (see CKP PATTERN CLEAR/CKP PATTERN LEARN ).
  48. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICEL SPEED
    • REL TP SENSOR
    • CLV (calculated load value)
    • GEAR POSITION
    • ECT SENSOR 1
  49. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? 

    YES  -Check for poor connections or loose terminals at the ignition coils, the injectors, and the PCM, then go to the troubleshooting for DTC P0300, P0301, P0302, P0303, P0304, P0305, or P0306  .

    NO  -Go to step 50.

  50. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 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  49, 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 PCM, then go to step  1. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step  48.

  51. Reconnect all connectors.
  52. Update the PCM if it does not have the latest software (see PCM UPDATE  ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  53. 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)
    • GEAR POSITION
    • ECT SENSOR 1
  54. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? 

    YES  -Check for poor connections or loose terminals at the ignition coils, the injectors, and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  53. If the PCM was substituted, go to step  1.

    NO  -Go to step 55.

  55. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT  ). If any other Pending or Confirmed DTCs were indicated in step  54, 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 PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  53. If the PCM was substituted, go to step  1. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step  53.

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