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Home >> Acura >> 2005 >> RL >> 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 ON (II).
  2. Do the DTC CLEAR in the CLEAR MENU with the HDS.
  3. Start the engine (in Park or neutral), then let it idle without load.
  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 driving 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
    • VSS
    • TP SENSOR A
    • CLV (calculated load value)
    • 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  9. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 8 and recheck.

  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 loose wires or poor connections

  9. Turn the ignition switch OFF.
  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
    • VSS
    • TP SENSOR A
    • CLV (calculated load value)
    • 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 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 coils

  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  55.

    NO  - Go to step 14.

  14. Turn the ignition switch OFF.
  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
    • VSS
    • TP SENSOR A
    • CLV (calculated load value)
    • 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 misfire 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  54.

    NO  - Go to step 19.

  19. Turn the ignition switch OFF.
  20. Exchange the injector from the problem cylinder with one from another cylinder.
  21. Start the engine, and let it idle 2 minutes.
  22. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • TP SENSOR A
    • CLV (calculated load value)
    • ECT SENSOR 1
  23. 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 24.

    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

  24. 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  55.

    NO  - Go to step 25.

  25. Turn the ignition switch OFF.
  26. Disconnect the ignition coil 3P connector from the problem cylinder.
  27. Turn the ignition switch ON (II).
  28. 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
    G05494341Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 29.

    NO  - Repair open in the wire between the ignition coil and the ignition coil relay, then go to step  55.

  29. Turn the ignition switch OFF.
  30. 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
    G05494342Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 31.

    NO  - Repair open in the wire between the ignition coil and G101, then go to step  55.

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

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 A20 YEL/GRN
    No. 2 P0302 A19 BLU/RED
    No. 3 P0303 A18 WHT/BLU
    No. 4 P0304 A17 BRN
    No. 5 P0305 A16 BLK/RED
    No. 6 P0306 A15 BRN/WHT
    Fig 3: Checking Continuity Between Body Ground And PCM Connector Terminal
    G05494343Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the PCM and the ignition coil, then go to step  55.

    NO  - Go to step 35.

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

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 YEL/GRN
    No. 2 P0302 BLU/RED
    No. 3 P0303 WHT/BLU
    No. 4 P0304 BRN
    No. 5 P0305 BLK/RED
    No. 6 P0306 BRN/WHT
    Fig 4: Connecting Ignition Coil 3P Connector Terminal No. 1 To Body Ground With Jumper Wire
    G05494344Courtesy of AMERICAN HONDA MOTOR CO., INC.
  36. Check for continuity between body ground and the appropriate PCM connector terminal (see WIRE COLOR SPECIFICATION ).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 A20 YEL/GRN
    No. 2 P0302 A19 BLU/RED
    No. 3 P0303 A18 WHT/BLU
    No. 4 P0304 A17 BRN
    No. 5 P0305 A16 BLK/RED
    No. 6 P0306 A15 BRN/WHT
    Fig 5: Checking Continuity Between Body Ground And PCM Connector Terminal
    G05494345Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 37.

    NO  - Repair open in the wire between the PCM and the ignition coil, then go to step  55.

  37. Reconnect the ignition coil 3P connector and PCM connector A (31P).
  38. Do an engine compression and a cylinder leakdown test.

    Did the engine pass both tests? 

    YES  - Go to step 39.

    NO  - Repair the engine, then go to step  55.

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

    Did the engine pass the test? 

    YES  - Go to step 40.

    NO  - Repair the VTEC rocker arm, then go to step  55.

  40. Turn the ignition switch OFF.
  41. Jump the SCS line with the HDS.
  42. Disconnect PCM connector A (31P).
  43. Turn the ignition switch ON (II).
  44. Measure voltage between body ground and the appropriate PCM connector terminal (see WIRE COLOR SPECIFICATION ).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 A21 BRN
    No. 2 P0302 A31 RED
    No. 3 P0303 A30 BLU
    No. 4 P0304 A29 YEL
    No. 5 P0305 A28 BLK/RED
    No. 6 P0306 A27 WHT/BLU
    Fig 6: Measuring Voltage Between Body Ground And PCM Connector Terminal
    G05494346Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step  54.

    NO  - Go to step 45.

  45. Turn the ignition switch OFF.
  46. Remove the intake manifold (see REMOVAL ).
  47. Disconnect the injector 2P connector from the problem cylinder.
  48. Turn the ignition switch ON (II).
  49. Measure voltage between injector 2P connector terminal No. 2 and body ground.
    Fig 7: Measuring Voltage Between Injector 2P Connector Terminal No. 2 And Body Ground
    G05494347Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step 50.

    NO  - Repair open in the wire between the injector and PGM-FI main relay 1 (Fl MAIN), then go to step  55.

  50. Turn the ignition switch OFF.
  51. Check for continuity between body ground and the appropriate PCM connector terminal (see WIRE COLOR SPECIFICATION ).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 A21 BRN
    No. 2 P0302 A31 RED
    No. 3 P0303 A30 BLU
    No. 4 P0304 A29 YEL
    No. 5 P0305 A28 BLK/RED
    No. 6 P0306 A27 WHT/BLU
    Fig 8: Checking Continuity Between Body Ground And PCM Connector Terminal
    G05494348Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the PCM and the injector, then go to step  55.

    NO  - Go to step 52.

  52. Connect appropriate injector 2P connector terminal No. 1 to body ground with a jumper wire (see WIRE COLOR SPECIFICATION ).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 BRN
    No. 2 P0302 RED
    No. 3 P0303 BLU
    No. 4 P0304 YEL
    No. 5 P0305 BLK/RED
    No. 6 P0306 WHT/BLU
    Fig 9: Connecting Injector 2P Connector Terminal No. 1 To Body Ground With Jumper Wire
    G05494349Courtesy of AMERICAN HONDA MOTOR CO., INC.
  53. Check for continuity between body ground and the appropriate PCM connector terminal (see WIRE COLOR SPECIFICATION ).
    WIRE COLOR SPECIFICATION

    PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR
    No. 1 P0301 A21 BRN
    No. 2 P0302 A31 RED
    No. 3 P0303 A30 BLU
    No. 4 P0304 A29 YEL
    No. 5 P0305 A28 BLK/RED
    No. 6 P0306 A27 WHT/BLU
    Fig 10: Checking Continuity Between Body Ground And PCM Connector Terminal
    G05494350Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 54.

    NO  - Repair open in the wire between the PCM and the injector, then go to step  55.

  54. 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
    G05494351Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 Ω? 

    YES  - Go to step  65.

    NO  - Replace the injector (see INJECTOR REPLACEMENT  ), then go to step 55.

  55. Reconnect all connectors.
  56. Turn the ignition switch ON (II).
  57. Reset the PCM with the HDS.
  58. Clear the CKP pattern with the HDS.
  59. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  60. Do the CKP pattern learn procedure (see CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN ).
  61. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • TP SENSOR A
    • CLV (calculated load value)
    • ECT SENSOR 1
  62. Check for Temporary DTCs or 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 coil, the injector, and the PCM, then go to step  1.

    NO  - Go to step 63.

  63. 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 Temporary DTCs or DTCs were indicated in step 63, 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 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  61.

  64. Reconnect all connectors.
  65. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  66. 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)
    • GEAR POSITION
    • ECT SENSOR 1
  67. Check for Temporary DTCs or 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 coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  66. If the PCM was substituted, go to step  1.

    NO  - Go to step 68.

  68. 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  - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT  ). If any other Temporary DTCs or DTCs were indicated in step  67, 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 PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  67. If the 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  67.

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