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Home >> Honda >> 2000 >> Insight >> 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 P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. After checking and recording the freeze data, reset the ECM (see ECM RESET ). If there is no freeze data of the misfire, just clear the DTC.
  2. Start the engine, and listen for a clicking sound at the injector at the problem cylinder.

    Does it click? 

    1. YES  - Go to step 3.
    2. NO  - Go to step  30.
  3. Turn the ignition switch OFF, and reset the ECM.
  4. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  5. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  6. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0301, P0302 or P0303 indicated? 

    1. YES  - Go to step 7.
    2. NO  - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time).
  7. Determine which cylinder(s) 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 8.
  8. Turn the ignition switch OFF, and reset the ECM with the HDS.
  9. Exchange the spark plug from the problem cylinder with one from another cylinder.
  10. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  11. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0301, P0302 or P0303 indicated? 

    1. YES  - Go to step 12.
    2. NO  - Intermittent misfire due to spark plug fouling, etc. (no misfire at this time).
  12. Determine which cylinder(s) 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 13.
  13. Turn the ignition switch OFF, and reset the ECM with the HDS.
  14. Exchange the injector from the problem cylinder with one from another cylinder.
  15. Let the engine idle 2 minutes.
  16. Test-drive the vehicle several minutes in the range of the freeze data or under various conditions if there was no freeze data.
  17. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0301, P0302 or P0303 indicated? 

    1. YES  - Go to step 18.
    2. NO  - Intermittent misfire due to bad contact at the injector connector (no misfire at this time).
  18. Determine which cylinder(s) 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 19.
  19. Turn the ignition switch OFF.
  20. Disconnect the ignition coil 3P connector from the problem cylinder.
  21. Turn the ignition switch ON (II).
  22. 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
    G03680775Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 23.
    2. NO  - Repair open or short in the wire between the No. 7 (15 A) fuse and the ignition coil.
  23. Turn the ignition switch OFF.
  24. 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
    G03680776Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 25.
    2. NO  - Repair open in the wire between the ignition coil and G101.
  25. Disconnect ECM connector C (31P).
  26. Check for continuity between body ground and the appropriate ECM connector terminal (see BODY GROUND AND ECM CONNECTOR TERMINAL  ).
    Fig 3: Checking Continuity Between Body Ground And Appropriate ECM Connector Terminal
    G03680777Courtesy of AMERICAN HONDA MOTOR CO., INC.
    BODY GROUND AND ECM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC ECM TERMINAL WIRE COLOR
    No. 1 P0301 C4 WHT
    No. 2 P0302 C13 WHT/GRN
    No. 3 P0303 C14 WHT/BLK

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM and the ignition coil.
    2. NO  - Go to step 27.
  27. Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see IGNITION COIL 3P CONNECTOR TO BODY GROUND  ).
    Fig 4: Connecting Appropriate Ignition Coil 3P Connector Terminal No. 1 To Body Ground With Jumper Wire
    G03680778Courtesy of AMERICAN HONDA MOTOR CO., INC.
    IGNITION COIL 3P CONNECTOR TO BODY GROUND

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 WHT
    No. 2 P0302 WHT/GRN
    No. 3 P0303 WHT/BLK
  28. Check for continuity between body ground and the appropriate ECM connector terminal (see BODY GROUND AND ECM CONNECTOR  ).
    Fig 5: Checking Continuity Between Body Ground And Appropriate ECM Connector Terminal
    G03680779Courtesy of AMERICAN HONDA MOTOR CO., INC.
    BODY GROUND AND ECM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC ECM TERMINAL WIRE COLOR
    No. 1 P0301 C4 WHT
    No. 2 P0302 C13 WHT/GRN
    No. 3 P0303 C14 WHT/BLK

    Is there continuity? 

    1. YES  - Go to step 29.
    2. NO  - Repair open in the wire between the ECM and the ignition coil.
  29. Check the engine compression.

    Is the engine compression OK? 

    1. YES  - Update the ECM if it does not have the latest software, or substitute a known-good ECM; 2000-2001 M/T models (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES (2000-2001 M/T MODELS) ), 2002-2006 M/T models and CVT model (see ECM UPDATING AND SUBSTITUTION FOR TESTING-2002-2006 M/T MODELS AND CVT MODEL ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
    2. NO  - Repair the engine.
  30. Turn the ignition switch OFF, and wait for 10 seconds.
  31. Disconnect ECM connector B (25P).
  32. Turn the ignition switch ON (II).
  33. Measure voltage between body ground and the appropriate ECM connector terminal (see BODY GROUND AND ECM CONNECTOR TERMINAL  ).
    Fig 6: Measuring Voltage Between Body Ground And Appropriate ECM Connector Terminal
    G03680780Courtesy of AMERICAN HONDA MOTOR CO., INC.
    BODY GROUND AND ECM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC ECM TERMINAL WIRE COLOR
    No. 1 P0301 B11 BRN
    No. 2 P0302 B3 RED
    No. 3 P0303 B4 BLU

    Is there battery voltage? 

    1. YES  - Go to step 34.
    2. NO  - Go to step  43.
  34. Turn the ignition switch OFF.
  35. Disconnect the injector 2P connector from the problem cylinder.
  36. At the injector side, measure resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 7: Measuring Resistance Between Injector 2P Connector Terminals No. 1 And 2
    G03680781Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10 - 13Ω? 

    1. YES  - Go to step 37.
    2. NO  - Replace the injector (see INJECTOR REPLACEMENT ).
  37. Exchange the injector from the problem cylinder with one from another cylinder.
  38. Reset the ECM with the HDS (see ECM RESET ).
  39. Let the engine idle 2 minutes.
  40. Test-drive the vehicle several minutes in the range of the freeze data or under various conditions if there was no freeze data.
  41. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0301, P0302 or P0303 indicated? 

    1. YES  - Go to step 42.
    2. NO  - Intermittent misfire due to injector malfunction, etc.
  42. Determine which cylinder(s) had the misfire.

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

    1. YES  - Replace the faulty injector.
    2. NO  - Update the ECM if it does not have the latest software, or substitute a known-good ECM; 2000-2001 M/T models (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES (2000-2001 M/T MODELS) ), 2002-2006 M/T models and CVT model (see ECM UPDATING AND SUBSTITUTION FOR TESTING-2002-2006 M/T MODELS AND CVT MODEL ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
  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. 2 and body ground.
    Fig 8: Measuring Voltage Between Injector 2P Connector Terminal No. 2 And Body Ground
    G03680782Courtesy 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 the appropriate ECM connector terminal (see BODY GROUND AND ECM CONNECTOR TERMINAL  ).
    Fig 9: Checking Continuity Between Body Ground And Appropriate ECM Connector Terminal
    G03680783Courtesy of AMERICAN HONDA MOTOR CO., INC.
    BODY GROUND AND ECM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC ECM TERMINAL WIRE COLOR
    No. 1 P0301 B11 BRN
    No. 2 P0302 B3 RED
    No. 3 P0303 B4 BLU

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM and the injector.
    2. NO  - Go to step 49.
  49. Connect appropriate injector 2P connector terminal No. 1 to body ground with a jumper wire (see INJECTOR 2P CONNECTOR TERMINAL TO BODY GROUND  ).
    Fig 10: Connecting Appropriate Injector 2P Connector Terminal To Body Ground With Jumper Wire
    G03680784Courtesy of AMERICAN HONDA MOTOR CO., INC.
    INJECTOR 2P CONNECTOR TERMINAL TO BODY GROUND

    PROBLEM CYLINDER DTC WIRE COLOR
    No.1 P0301 BRN
    No. 2 P0302 RED
    No. 3 P0303 BLU
  50. Check for continuity between body ground and the appropriate ECM connector terminal (see BODY GROUND AND ECM CONNECTOR TERMINAL  ).
    Fig 11: Checking Continuity Between Body Ground And Appropriate ECM Connector Terminal
    G03680785Courtesy of AMERICAN HONDA MOTOR CO., INC.
    BODY GROUND AND ECM CONNECTOR TERMINAL

    PROBLEM CYLINDER DTC ECM TERMINAL WIRE COLOR
    No.1 P0301 B11 BRN
    No. 2 P0302 B3 RED
    No. 3 P0303 B4 BLU

    Is there continuity? 

    1. YES  - Replace the injector, then recheck.
    2. NO  - Repair open in the wire between the ECM and the injector.
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