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Home >> Acura >> 2008 >> 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 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, 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
    • REL TP SENSOR
    • CLV (calculated load value)
    • ECT SENSOR 1
    • GEAR POSITION
    • APP SENSOR
  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 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. Reconnect all connectors.
  12. 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)
    • ECT SENSOR 1
    • GEAR POSITION
    • APP SENSOR
  13. 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 14.

    NO  -Intermittent misfire due to poor contact at the ignition coil connector {no misfire at this time). Make sure the coil connections are secure.

  14. 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  56.

    NO  -Go to step 15.

  15. Turn the ignition switch OFF.
  16. Exchange the spark plug from the problem cylinder with one from another cylinder.
  17. Reconnect all connectors.
  18. 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)
    • ECT SENSOR 1
    • GEAR POSITION
    • APP SENSOR
  19. 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 20.

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

  20. 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  56.

    NO  -Go to step 21.

  21. Turn the ignition switch OFF.
  22. Disconnect the ignition coil 3P connector from the problem cylinder.
  23. Turn the ignition switch ON (II).
  24. 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
    G05457973Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 25.

    NO  -Repair open in the wire between the ignition coil and the ignition coil relay, then go to step  56.

  25. Turn the ignition switch OFF.
  26. 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
    G05457974Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 27.

    NO  -Repair open in the wire between the ignition coil and G101, then go to step  56.

  27. Turn the ignition switch OFF.
  28. Jump the SCS line with the HDS.
  29. Disconnect ECM/PCM connector A (31P).
  30. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    ECM/PCM CONNECTOR TERMINAL DESCRIPTION

    PROBLEM CYLINDER DTC ECM/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 Appropriate ECM/PCM Connector Terminal
    G05457975Courtesy 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  56.

    NO  -Go to step 31.

  31. Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see table).
    ECM/PCM TERMINAL DESCRIPTION

    PROBLEM CYLINDER DTC ECM/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 4: Connecting Appropriate Ignition Coil 3P Connector Terminal No. 1 To Body Ground With Jumper Wire
    G05457976Courtesy of AMERICAN HONDA MOTOR CO., INC.
  32. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    ECM/PCM TERMINAL DESCRIPTION

    PROBLEM CYLINDER DTC ECM/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 Appropriate ECM/PCM Connector Terminal
    G05457977Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 33.

    NO  -Repair open in the wire between the ECM/PCM and the ignition coil, then go to step  56.

  33. Turn the ignition switch ON (II).
  34. Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see table).
    ECM/PCM TERMINAL DESCRIPTION

    PROBLEM CYLINDER DTC ECM/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 Appropriate ECM/PCM Connector Terminal
    G05457978Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  44.

    NO  -Go to step 35.

  35. Turn the ignition switch OFF.
  36. Remove the intake manifold (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ).
  37. Disconnect the injector 2P connector from the problem cylinder.
  38. Turn the ignition switch ON (II).
  39. 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
    G05457979Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 40.

    NO  -Repair open in the wire between the injector and PGM-FI main relay 1, then go to step  56.

  40. Turn the ignition switch OFF.
  41. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    ECM/PCM TERMINAL DESCRIPTION

    PROBLEM CYLINDER DTC ECM/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 Appropriate ECM/PCM Connector Terminal
    G05457980Courtesy 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  56.

    NO  -Go to step 42.

  42. Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table).
    DTC

    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 Appropriate Injector 2P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G05457981Courtesy of AMERICAN HONDA MOTOR CO., INC.
  43. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    ECM/PCM TERMINAL DESCRIPTION

    PROBLEM CYLINDER DTC ECM/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 Appropriate ECM/PCM Connector Terminal
    G05457982Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 44.

    NO  -Repair open in the wire between the ECM/PCM and the injector, then go to step  56.

  44. At the injector side, 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
    G05457983Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 Ω? 

    YES  -Go to step 45.

    NO  -Replace the injector (see INJECTOR REPLACEMENT  ), then go to step  56.

  45. Exchange the injector from the problem cylinder with one from the another cylinder.
  46. Reconnect all connectors, and install the intake manifold (see INSTALLATION ).
  47. Turn the ignition switch ON (II).
  48. Clear the DTCs with the HDS.
  49. Start the engine, and let it idle without load (in Park or neutral) for 2 minutes.
  50. 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)
    • ECT SENSOR 1
    • GEAR POSITION
    • APP SENSOR
  51. 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 52.

    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.

  52. 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  56.

    NO  -Go to step 53.

  53. Turn the ignition switch OFF.
  54. Do an engine compression and a cylinder leakdown test.

    Did the engine pass both tests? 

    YES  -Go to step 55.

    NO  -Repair the engine, then go to step  56.

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

    Did the engine pass the test? 

    YES  -Go to step  66.

    NO  -Repair the VTEC rocker arm, then go to step 56.

  56. Reconnect all connectors.
  57. Turn the ignition switch ON (II).
  58. Reset the ECM/PCM with the HDS.
  59. Clear the CKP pattern with the HDS.
  60. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  61. Do the CKP pattern learn procedure (see CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN ).
  62. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGNE SPEED
    • VSS
    • REL TP SENSOR
    • CLV (calculated load value)
    • ECT SENSOR 1
    • GEAR POSITION
    • APP SENSOR
  63. 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 ECM/PCM, then go to DTC P0301, P0302, P0303, P0304, P0305, or P0306 troubleshooting (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 64.

  64. 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 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  62.

  65. Reconnect all connectors.
  66. 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 ).
  67. 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)
    • ECT SENSOR 1
    • GEAR POSITION
    • APP SENSOR
  68. 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 injectors, the ignition coils, and the ECM/PCM, then go to step  1. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  67. If the ECM/PCM was substituted, go to step  1.

    NO  -Go to step 69.

  69. 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  68, 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  67. 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  67.

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