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Home >> Honda >> 2000 >> Odyssey EX >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P0301 - '01 Model: No. 1 Cylinder Misfire Detected, DTC P0302 - '01 Model: No. 2 Cylinder Misfire Detected, DTC P0303 - '01 Model: No. 3 Cylinder Misfire Detected, DTC P0304 - '01 Model: No. 4 Cylinder Misfire Detected, DTC P0305 - '01 Model: No. 5 Cylinder Misfire Detected, DTC P0306 '01 Model: No. 6 Cylinder Misfire Detected

DTC P0301 - '01 Model: No. 1 Cylinder Misfire Detected, DTC P0302 - '01 Model: No. 2 Cylinder Misfire Detected, DTC P0303 - '01 Model: No. 3 Cylinder Misfire Detected, DTC P0304 - '01 Model: No. 4 Cylinder Misfire Detected, DTC P0305 - '01 Model: No. 5 Cylinder Misfire Detected, DTC P0306 '01 Model: No. 6 Cylinder Misfire Detected

  1. Remove the intake manifold cover and the ignition coil cover (see steps 11 and 12 on Cylinder Head Removal ).
  2. After checking and recording the freeze data, reset the PCM (see HOW TO RESET THE PCM ). If there is no freeze data of misfiring, just clear the DTC.
  3. Start the engine, and listen for a clicking sound from the injector in the problem cylinder.

    Does the injector click? 

    1. YES:  Go to step 4.
    2. NO:  Go to step  31.
  4. Turn the ignition switch OFF.
  5. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  6. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  7. Check for a DTC or a Temporary DTC with the scan tool or the HDS.

    Is DTC P0301, P0302, P0303, P0304, P0305, or P0306, or Temporary DTC P1399 indicated? 

    1. YES:  Go to step 8.
    2. NO:  Intermittent misfire due to ignition coil fouling, etc. (no misfire at this time).
  8. Determine which cylinder had the misfire.

    Does the misfire occur in the cylinder where the ignition coil was exchanged? 

    1. YES:  Replace the faulty ignition coil.
    2. NO:  Go to step 9.
  9. Turn the ignition switch OFF.
  10. Exchange the spark plug from the problem cylinder with one from another cylinder.
  11. Test drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  12. Check for a DTC or a Temporary DTC with the scan tool or the HDS.

    Is DTC P0301, P0302, P0303, P0304 P0305, or P0306 or Temporary DTC P1399 indicated? 

    1. YES:  Go to step 13.
    2. NO:  Intermittent misfire due to spark plug fouling, etc (no misfire at this time).
  13. Determine which cylinder had the misfire.

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

    1. YES:  Replace the faulty spark plug.
    2. NO:  Go to step 14.
  14. Turn the ignition switch OFF.
  15. Exchange the injector from the problem cylinder with one from another cylinder.
  16. Let the engine idle for 2 minutes.
  17. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  18. Check for a DTC or a Temporary DTC with the scan tool or the HDS.

    Is DTC P0301 P0302, P0303, P0304, P0305, or P0306, or Temporary DTC P1399 indicated? 

    1. YES:  Go to step 19.
    2. 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.
  19. Determine which cylinder had the misfire.

    Does the misfire occur in the cylinder where the injector was exchanged? 

    1. YES:  Replace the faulty injector (see Injector Replacement  ).
    2. NO:  Go to step 20.
  20. Turn the ignition switch OFF.
  21. Disconnect the ignition coil 3P connector from the problem cylinder.
  22. Turn the ignition switch ON (II).
  23. 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 & Body Ground
    G01505616Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES:  Go to step 24.
    2. NO:  Repair open or short in the wire between the No. 7 COIL (15A) fuse and the ignition coil.
  24. Turn the ignition switch OFF.
  25. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground.
    Fig 2: Checking For Continuity Between Ignition Coil 3P Connector Terminal No. 2 & Body Ground
    G01505617Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Go to step 26.
    2. NO:  Repair open in the wire between the ignition coil and G101 (or G102).
  26. Disconnect PCM connector B (24P).
  27. Check for continuity between body ground and the PCM connector terminal (see table).
    Fig 3: Checking For Continuity Between Body Ground & The PCM Connector Terminal (1 Of 2)
    G01505618Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 4: Checking For Continuity Between Body Ground & The PCM Connector Terminal (2 Of 2)
    G01505619Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Repair short in the wire between the PCM and the ignition coil.
    2. NO:  Go to step 28.
  28. Connect ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see table).
    Fig 5: Connecting Ignition Coil 3P Connector Terminal No. 1 To Body Ground With A Jumper Wire (1 Of 2)
    G01505620Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 6: Connecting Ignition Coil 3P Connector Terminal No. 1 To Body Ground With A Jumper Wire (2 Of 2)
    G01505621Courtesy of AMERICAN HONDA MOTOR CO., INC.
  29. Check for continuity between body ground and PCM connector terminal (see table).
    Fig 7: Checking For Continuity Between Body Ground & PCM Connector Terminal (1 Of 2)
    G01505622Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 8: Checking For Continuity Between Body Ground & PCM Connector Terminal (2 Of 2)
    G01505623Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Go to step 30.
    2. NO:  Repair open in the wire between the PCM and the ignition coil.
  30. Check the engine compression (see Engine Compression Inspection ).

    Is the engine compression OK? 

    1. YES:  Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE ). If the symptom/indication goes away, replace the original PCM.
    2. NO:  Repair the engine.
  31. Turn the ignition switch OFF.
  32. Disconnect PCM connector B (24P).
  33. Turn the ignition switch ON (II).
  34. Measure voltage between body ground and the PCM connector terminal (see table).
    Fig 9: Measuring Voltage Between Body Ground & The PCM Connector Terminal (1 Of 2)
    G01505624Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 10: Measuring Voltage Between Body Ground & The PCM Connector Terminal (2 Of 2)
    G01505625Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES:  Go to step 35.
    2. NO:  Go to step  43.
  35. Turn the ignition switch OFF.
  36. Disconnect the injector 2P connector from the problem cylinder.
  37. Measure resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 11: Measuring Resistance Between Injector 2P Connector Terminals No. 1 & No. 2
    G01505626Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 k ohms? 

    1. YES:  Go to step 38.
    2. NO:  Replace the injector (see Injector Replacement  ).
  38. Exchange the injector from the problem cylinder with one from another cylinder.
  39. Let the engine idle for 2 minutes.
  40. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  41. Check for a DTC or a Temporary DTC with the scan tool or the HDS.

    Is DTC P0301, P0302, P0303, P0304, P0305, or P0306, or Temporary DTC P1399 indicated? 

    1. YES:  Go to step 42.
    2. NO:  Intermittent misfire due to injector fouling, etc. Make sure the injector connections are secure. Check for poor connections or loose terminals at the injector connectors.
  42. Determine which cylinder had the misfire.

    Does the misfire occur in the other cylinder where the injector was exchanged? 

    1. YES:  Replace the faulty injector (see Injector Replacement  ).
    2. NO:  Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE ) If the symptom/indication goes away, replace the original PCM.
  43. Turn the ignition switch OFF.
  44. Disconnect the injector 2P connector from the problem cylinder.
  45. Turn the ignition switch ON (II).
  46. Measure voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 12: Measuring Voltage Between Injector 2P Connector Terminal No. 1 & Body Ground
    G01505627Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES:  Go to step 47.
    2. NO:  Repair open in the wire between the injector and the PGM-FI main relay.
  47. Turn the ignition switch OFF.
  48. Check for continuity between body ground and PCM connector terminal (see table).
    Fig 13: Checking For Continuity Between Body Ground & PCM Connector Terminal (1 Of 2)
    G01505628Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 14: Checking For Continuity Between Body Ground & PCM Connector Terminal (2 Of 2)
    G01505629Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Repair short in the wire between the PCM and the injector.
    2. NO:  Go to step 49.
  49. Connect injector 2P connector terminal No. 2 to body ground with a jumper wire (see table).
    Fig 15: Connecting Injector 2P Connector Terminal No. 2 To Body Ground With A Jumper Wire (1 Of 2)
    G01505630Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 16: Connecting Injector 2P Connector Terminal No. 2 To Body Ground With A Jumper Wire (2 Of 2)
    G01505631Courtesy of AMERICAN HONDA MOTOR CO., INC.
  50. Check for continuity between body ground and PCM connector terminals (see table).
    Fig 17: Checking For Continuity Between Body Ground & PCM Connector Terminals (1 Of 2)
    G01505632Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 18: Checking For Continuity Between Body Ground & PCM Connector Terminals (2 Of 2)
    G01505633Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Replace the injector (see Injector Replacement  ), then recheck.
    2. NO:  Repair open in the wire between the PCM and the injector.
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