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Home >> Acura >> 2012 >> TL Base >> 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), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Start the engine, and let it idle without load for 2 minutes (A/T in P or N, M/T in neutral).
  4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 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, 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 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.

  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 ignition system. ■

  9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  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 the 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 coil (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), or press the engine start/stop button to select the OFF mode.
  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, then go to step  44.

    NO  - Go to step 19.

  19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  20. Jump the SCS line with the HDS.
  21. Disconnect ECM/PCM connector B (49P).
  22. Remove the intake manifold (see REMOVAL ).
  23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  24. Measure the voltage between body ground and the appropriate ECM/PCM connector terminal (see table).
    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 BRN
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 YEL
    No. 5 P0305 B5 BLK/RED
    No. 6 P0306 B9 WHT/BLU
    Fig 1: Measuring Voltage Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G08069390Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step  29.

    NO  - Go to step 25.

  25. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  26. Disconnect the injector 2P connector from the problem cylinder.
  27. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  28. Measure the voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 2: Measuring Voltage Between Injector 2P Connector Terminal No. 1 And Body Ground
    G08069391Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 29.

    NO  - Repair 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), or press the engine start/stop button to select the OFF mode.
  30. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 BRN
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 YEL
    No. 5 P0305 B5 BLK/RED
    No. 6 P0306 B9 WHT/BLU
    Fig 3: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G08069392Courtesy 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  44.

    NO  - Go to step 31.

  31. Check for continuity between appropriate injector 2P connector terminal No. 2 and the ECM/PCM connector terminal of the problem cylinder (see table).
    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B4 BRN
    No. 2 P0302 B8 RED
    No. 3 P0303 B7 BLU
    No. 4 P0304 B6 YEL
    No. 5 P0305 B5 BLK/RED
    No. 6 P0306 B9 WHT/BLU
    Fig 4: Checking Continuity Between Appropriate Injector 2P Connector And ECM/PCM Connector
    G08069393Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 5: Checking Continuity Between Appropriate Injector 2P Connector And ECM/PCM Connector
    G08069394Courtesy 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 open in the wire between the ECM/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 6: Measuring Resistance Between Injector 2P Connector Terminals No. 1 And No. 2
    G08069395Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10- 13 Ω at room temperature? 

    YES  - Go to step 33.

    NO  - Replace the injector , then go to step  44.

  33. Exchange the injector from the problem cylinder with the one from another cylinder. Also check the injector fuel inlet screen for debris, and clean it if needed.
  34. Reconnect all connectors, and install the intake manifold (see INSTALLATION ).
  35. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  36. Clear the DTCs with the HDS.
  37. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) 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 , then go to step  44.

    NO  - Go to step 41.

  41. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  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 VTEC rocker arm test (see VTEC ROCKER ARM TEST ).

    Did the engine pass the test? 

    YES  - Go to step  51.

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

  44. Reconnect all connectors.
  45. Reset the ECM/PCM with the HDS.
  46. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  47. Do the CKP pattern learn/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
    • VEHICLE 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 ECM/PCM, then go to step then go to troubleshooting DTC P0300, P0301, P0302, P0303, P0304, P0305, or P0306  (see DTC Troubleshooting ).

    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 screen 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 screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, 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  48.

  51. Reconnect all connectors.
  52. Update the ECM/PCM  if it does not have the latest software (see ECM/PCM Update ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  53. If the ECM/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.

    Is 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 ). If any other Pending or Confirmed DTCs were indicated in step  54, go to the indicated DTC's troubleshooting. ■

    NO  - If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, 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  53. 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  53.

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