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Home >> Honda >> 2012 >> Ridgeline RTS >> 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 ).
  • Information marked with an asterisk (*1) applies to '09-11 models.
  • Information marked with an asterisk (*2) applies to '12 model.
  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, and 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 SENSOR
    • 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 the fuel and ignition system circuit connectors for poor connections or loose terminals. ■

  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 SENSOR
    • 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 connector (no misfire at this time). Make sure 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 coil (see IGNITION COIL REMOVAL/INSTALLATION ), then Go to step  37.

    NO  -Go to step 14.

  14. Turn the ignition switch to LOCK (0).
  15. Exchange the spark plug from the problem cylinder with the 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 SENSOR
    • 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, then Go to step  37.

    NO  -Go to step 19.

  19. Turn the ignition switch to LOCK (0).
  20. Exchange the injector from the problem cylinder with one from another cylinder.
  21. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED SENSOR
    • REL TP SENSOR
    • CLV (calculated load value)
    • GEAR POSITION
    • ECT SENSOR 1
  22. 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 poor contact at the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector. ■

  23. 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  37.

    NO  -Go to step 24.

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

    Did the engine pass both tests? 

    YES  -Go to step 26.

    NO  -Repair the engine, then Go to step  37.

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

    Did the engine pass the test? 

    YES  -Go to step 27.

    NO  -Repair the VTEC rocker arm, then Go to step  37.

  27. Turn the ignition switch to LOCK (0).
  28. Disconnect the injector 2P connector from the problem cylinder.
  29. Turn the ignition switch to ON (II).
  30. Measure the voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 1: Measuring Voltage Between Injector 2P Connector Terminal No. 1 And Body Ground
    G00512155Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 31.

    NO  -Repair open in the wire between the injector and PGM-FI main relay 1, then Go to step  37.

  31. Turn the ignition switch to LOCK (0).
  32. Jump the SCS line with the HDS.
  33. Disconnect PCM connector C (49P).
  34. Check for continuity between body ground and the PCM connector terminals (see table).
    TERMINAL REFERENCE CHART

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 BRN*1
    GRN*2
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 YEL*1
    TAN*2
    No. 5 P0305 B5 BLK/RED*1
    PNK*2
    No. 6 P0306 B9 WHT/BLU*1
    LT BLU*2
    Fig 2: Checking Continuity Between Body Ground And The PCM Connector Terminals
    G00512156Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  37.

    NO  -Go to step 35.

  35. Check for continuity between appropriate injector 2P connector terminal No. 2 and the PCM connector terminal of the problem cylinder (see table).
    TERMINAL REFERENCE CHART

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 BRN*1
    GRN*2
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 YEL*1
    TAN*2
    No. 5 P0305 B5 BLK/RED*1
    PNK*2
    No. 6 P0306 B9 WHT/BLU*1
    LT BLU*2
    Fig 3: Checking Continuity Between Appropriate Injector 2P Connector Terminal No. 2 And PCM Connector Terminal
    G05964410Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 4: Checking Continuity Between Appropriate Injector 2P Connector Terminal No. 2 And PCM Connector Terminal
    G05964411Courtesy 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 36.

    NO  -Repair open in the wire between the PCM and the injector, then Go to step  37.

  36. At the injector side, measure the resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 5: Measuring Resistance Between Injector 2P Connector Terminals No. 1 And No. 2
    G05964412Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 Ω? 

    YES  -Go to step  46.

    NO  -Replace the injector (see INJECTOR REPLACEMENT ), then Go to step 38.

  37. Turn the ignition switch to LOCK (0).
  38. Reconnect all connectors.
  39. Turn the ignition switch to ON (II).
  40. Reset the PCM with the HDS.
  41. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  42. Do the CKP pattern learn procedure (see CKP PATTERN CLEAR/CKP PATTERN LEARN ).
  43. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED SENSOR
    • REL TP SENSOR
    • CLV (calculated load value)
    • GEAR POSITION
    • ECT SENSOR 1
  44. Check for Pending DTCs 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 (see 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 P0305: NO. 5 CYLINDER MISFIRE DETECTED; DTC P0306: NO. 6 CYLINDER MISFIRE DETECTED ).

    NO  -Go to step 45.

  45. 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 DTCs or Confirmed DTCs were indicated in step 44, 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 or NOT COMPLETED, go to step  43.

  46. Reconnect all connectors.
  47. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  48. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VEHICLE SPEED SENSOR
    • REL TP SENSOR
    • CLV (calculated load value)
    • GEAR POSITION
    • ECT SENSOR 1
  49. Check for Pending DTCs 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  48. If the PCM was substituted, Go to step 1.

    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  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending DTCs 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. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then Go to step  48. 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  48.

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