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Home >> Honda >> 2007 >> Fit Base, Standard >> 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 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 ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine, and let it idle without load (in Park or 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 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.

    Does 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 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 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. Check the fuel and ignition system circuit connections for loose wires or poor connections.

  9. Turn the ignition switch OFF.
  10. Remove the engine cover (see step 1 on REMOVAL ).
  11. Start the engine, and listen for a clicking sound at the injector of the problem cylinder.

    Does the injector click? 

    YES  - Go to step  12.

    NO  - Go to step  43.

  12. Turn the ignition switch OFF.
  13. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  14. 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
  15. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

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

    YES  - Go to step  16.

    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.

  16. 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 REMOVAL/INSTALLATION ), then go to step  62.

    NO  - Go to step  17.

  17. Turn the ignition switch OFF.
  18. Exchange the spark plug from the problem cylinder with one from another cylinder.
  19. 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
  20. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

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

    YES  - Go to step  21.

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

  21. Determine which cylinder had the misfire.

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

    YES  - Replace the faulty spark plug, then go to step  62.

    NO  - Go to step  22.

  22. Turn the ignition switch OFF.
  23. Exchange the injector from the problem cylinder with one from another cylinder.
  24. Start the engine, and let it idle 2 minutes.
  25. 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
  26. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

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

    YES  - Go to step  27.

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

  27. 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 step  62.

    NO  - Go to step  28.

  28. Turn the ignition switch OFF.
  29. Disconnect the ignition coil 3P connector from the problem cylinder.
  30. Turn the ignition switch ON (II).
  31. Measure voltage between ignition coil 3P connector terminal No. 3 and body ground.
    Fig 1: Measuring Voltage Between Ignition Coil 3P Connector Terminal No. 3 And Body Ground
    G05454528Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step  32.

    NO  - Repair open in the wire between the ignition coil and the No. 33 IG COIL (15 A) fuse, then go to step  62.

  32. Turn the ignition switch OFF.
  33. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground.
    Fig 2: Checking Continuity Between Ignition Coil 3P Connector Terminal No. 2 And Body Ground
    G05454529Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  34.

    NO  - Repair open in the wire between the ignition coil and G101, then go to step  62.

  34. Turn the ignition switch OFF.
  35. Jump the SCS line with the HDS.
  36. Disconnect ECM/PCM connector A (31P).
  37. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 A16 WHT
    No. 2 P0302 A15 WHT/GRN
    No. 3 P0303 A14 WHT/BLK
    No. 4 P0304 A13 WHT/BLU
    Fig 3: Checking Continuity Between Body Ground And ECM/PCM Connector Terminal
    G05454530Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the ECM/PCM and the ignition coil, then go to step  62.

    NO  - Go to step  38.

  38. Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 WHT
    No. 2 P0302 WHT/GRN
    No. 3 P0303 WHT/BLK
    No. 4 P0304 WHT/BLU
    Fig 4: Identifying Ignition Coil 3P Connector Terminal No. 1 To Body Ground With Jumper Wire
    G05454531Courtesy of AMERICAN HONDA MOTOR CO., INC.
  39. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 A16 WHT
    No. 2 P0302 A15 WHT/GRN
    No. 3 P0303 A14 WHT/BLK
    No. 4 P0304 A13 WHT/BLU
    Fig 5: Checking Continuity Between Body Ground And ECM/PCM Connector Terminal
    G05454532Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  40.

    NO  - Repair open in the wire between the ECM/PCM and the ignition coil, then go to step  62.

  40. Reconnect the ignition coil 3P connector and ECM/PCM connector A (31P).
  41. Do an engine compression and a cylinder leakdown test.

    Did the engine pass both tests? 

    YES  - Go to step  42.

    NO  - Repair the engine, then go to step  62.

  42. Do the VTEC rocker arms test (see VTEC ROCKER ARM TEST ).

    Did the VTEC rocker arms pass the test? 

    YES  - Go to step  71.

    NO  - Repair the VTEC rocker arm, then go to step  62.

  43. Turn the ignition switch OFF.
  44. Jump the SCS line with the HDS.
  45. Disconnect ECM/PCM connector B (24P).
  46. Turn the ignition switch ON (II).
  47. Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL
    Fig 6: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminal
    G05454533Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step  56.

    NO  - Go to step  48.

  48. Turn the ignition switch OFF.
  49. Disconnect the injector 2P connector from the problem cylinder.
  50. Turn the ignition switch ON (II).
  51. Measure voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 7: Measuring Voltage Between Injector 2P Connector Terminal No. 1 And Body Ground
    G05454534Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step  52.

    NO  - Repair open in the wire between the injector and PGM-FI main relay 1 (Fl MAIN), then go to step  62.

  52. Turn the ignition switch OFF.
  53. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL
    Fig 8: Checking Continuity Between Body Ground And ECM/PCM Connector Terminal
    G05454535Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the ECM/PCM and the injector, then go to step  62.

    NO  - Go to step  54.

  54. Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 BRN
    No. 2 P0302 RED
    No. 3 P0303 BLU
    No. 4 P0304 YEL
    Fig 9: Identifying Injector 2P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G05454536Courtesy of AMERICAN HONDA MOTOR CO., INC.
  55. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL
    Fig 10: Checking Continuity Between Body Ground And ECM/PCM Connector Terminal
    G05454537Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  56.

    NO  - Repair open in the wire between the ECM/PCM and the injector, then go to step  62.

  56. Measure resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 11: Measuring Resistance Between Injector 2P Connector Terminals No. 1 And No. 2
    G05454538Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10 - 13 Ω? 

    YES  - Go to step  57.

    NO  - Replace the injector (see INJECTOR REPLACEMENT ), then go to step  62.

  57. Exchange a known-good injector from another cylinder with the one from the problem cylinder.
  58. Reconnect ECM/PCM connector B (24P).
  59. Start the engine, and let it idle 2 minutes.
  60. 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
  61. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

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

    YES  - Go to step  71.

    NO  - Replace the original injector (see INJECTOR REPLACEMENT ), then go to step  62.

  62. Reconnect all connectors.
  63. Turn the ignition switch ON (II).
  64. Reset the ECM/PCM with the HDS.
  65. Clear the CKP pattern with the HDS.
  66. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  67. Do the CKP pattern learn procedure (see CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN ).
  68. 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
  69. Check for Temporary DTCs or DTCs with the HDS.

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

    YES  - Check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go to troubleshooting DTC P0300 , P0301 , P0302 , P0303 , or P0304  .

    NO  - Go to step  70.

  70. 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 DTSs were indicated in step 69, go to the indicated DTCs troubleshooting.

    NO  - If the screen indicates FAILED, go to step  1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  68.

  71. Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  72. 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
  73. Check for Temporary DTCs or DTCs with the HDS.

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

    YES  - Check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  72. If the ECM/PCM was substituted, go to step  1.

    NO  - Go to step  74.

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

    Does the screen indicate PASSED? 

    YES  - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated in step 73, go to the indicated DTCs troubleshooting.

    NO  - If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  72. If the ECM/PCM was substituted, 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  72.

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