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Home >> Acura >> 2003 >> RSX Base, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> PGM-FI System >> DTC Troubleshooting >> DTC P0301, P0302, P0303, P0304: No. 1-4 Cylinder Misfire Detected (2002-2004 models)

DTC P0301, P0302, P0303, P0304: No. 1-4 Cylinder Misfire Detected (2002-2004 models)

  1. After checking and recording the freeze data, reset the ECM/PCM (see ECM/PCM RESET (2002-2004 MODELS) ). 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 of the problem cylinder.

    Does it click? 

    1. YES -  Go to step 3.
    2. NO -  Go to step  26.
  3. Turn the ignition switch OFF, and reset the ECM/PCM.
  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 a DTC or a Temporary DTC with a scan tool or the HDS.

    Is DTC or Temporary DTC P0301, P0302, P0303 or P0304 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/PCM.
  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 a DTC or a Temporary DTC with a scan tool or the HDS.

    Is DTC or Temporary DTC P0301, P0302, P0303 or P0304 indicated? 

    1. YES -  Go to step 12.
    2. NO -  Intermittent misfire due to spark plug fouling (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/PCM.
  14. Exchange the injector from the problem cylinder with one from the another cylinder.
  15. Let the engine idle for 2 minutes.
  16. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  17. Check for a DTC or a Temporary DTC with a scan tool or the HDS.

    Is DTC or Temporary DTC P0301, P0302, P0303 or P0304 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 3 And Body Ground
    G03650710Courtesy 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. 1 IGN COIL (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 2 And Body Ground
    G03650711Courtesy 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/PCM connector A (31P).
  26. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 3: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650712Courtesy of AMERICAN HONDA MOTOR CO., INC.
    TERMINALS REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 A30 YEL/GRN
    No. 2 P0302 A29 BLU/RED
    No. 3 P0303 A28 WHT/BLU
    No. 4 P0304 A27 BRN

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM and the ignition coil.
    2. NO -  Go to step 27.
  27. Connect the appropriate ignition coil 3P connector terminal No. 1 and body ground with a jumper wire (see table).
    Fig 4: Connecting Appropriate Ignition Coil 3P Connector Terminal 1 And Body Ground With Jumper Wire
    G03650713Courtesy of AMERICAN HONDA MOTOR CO., INC.
    TERMINALS REFERENCE

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 YEL/GRN
    No. 2 P0302 BLU/RED
    No. 3 P0303 WHT/BLU
    No. 4 P0304 BRN
  28. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 5: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650714Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 A30 YEL/GRN
    No. 2 P0302 A29 BLU/RED
    No. 3 P0303 A28 WHT/BLU
    No. 4 P0304 A27 BRN

    Is there continuity? 

    1. YES -  Go to step 29.
    2. NO -  Repair open in the wire between the ECM/PCM and the ignition coil.
  29. Do an engine compression and a cylinder leakdown test.

    Did the engine pass both tests? 

    1. YES -  Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see HOW TO UPDATE THE ECM/PCM ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ).
    2. NO -  Repair the engine.
  30. Disconnect ECM/PCM connector B (24P).
  31. Turn the ignition switch ON (II).
  32. Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 6: Measuring Voltage Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650715Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL

    Is there battery voltage? 

    1. YES -  Go to step 33.
    2. NO -  Go to step  33.
  33. Turn the ignition switch OFF.
  34. Disconnect the injector 2P connector from the problem cylinder.
  35. Measure resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 7: Measuring Resistance Between Injector 2P Connector Terminals 1 And 2
    G03650716Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 Ω 

    1. YES -  Go to step 36.
    2. NO -  Replace the injector (see INJECTOR REPLACEMENT  ).
  36. Exchange the injector from the problem cylinder with one from another cylinder.
  37. Reset the ECM/PCM.
  38. Let the engine idle for 2 minutes.
  39. Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
  40. Check for a DTC or a Temporary DTC with a scan tool or the HDS.

    Is DTC or Temporary DTC P0301, P0302, P0303, or P0304 indicated? 

    1. YES -  Go to step 41.
    2. NO -  Intermittent misfire due to injector malfunction.
  41. 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/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see HOW TO UPDATE THE ECM/PCM ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ).
  42. Turn the ignition switch OFF.
  43. Disconnect the injector 2P connector from the problem cylinder.
  44. Turn the ignition switch ON (II).
  45. Measure voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 8: Measuring Voltage Between Injector 2P Connector Terminal 1 And Body Ground
    G03650717Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 46.
    2. NO -  Repair open in the wire between the injector and the PGM-FI main relay.
  46. Turn the ignition switch OFF.
  47. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 9: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650718Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM and the injector.
    2. NO -  Go to step 48.
  48. Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table).
    Fig 10: Connecting Appropriate Injector 2P Connector Terminal 2 To Body Ground With Jumper Wire
    G03650719Courtesy of AMERICAN HONDA MOTOR CO., INC.
    TERMINAL REFERENCE

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 BRN
    No. 2 P0302 RED
    No. 3 P0303 BLU
    No. 4 P0304 YEL
  49. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 11: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650720Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL

    Is there continuity? 

    1. YES -  Replace the injector (see INJECTOR REPLACEMENT  ), then recheck.
    2. NO -  Repair open in the wire between the ECM/PCM and the injector.


  1. Record all freeze data and on-board snapshots with the HDS.
  2. Clear the DTC 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, or P0304 in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    1. YES -  Go to step  9.
    2. 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, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    1. YES -  Go to step  9.
    2. 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
    • Throttle position
    • CLV (calculated load value)
    • Gear position
  7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    1. YES -  Go to step  9.
    2. 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, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    1. YES -  Go to step 9.
    2. NO -  Intermittent failure, system is OK at this time.
  9. Turn the ignition switch OFF.
  10. Remove the intake manifold cover (see step 1 on REMOVAL - K20A3 ENGINE ).
  11. Start the engine, and listen for a clicking sound at the injector of the problem cylinder.

    Does the injector click? 

    1. YES -  Go to step 12.
    2. NO -  Go to step  27.
  12. Turn the ignition switch OFF.
  13. Exchange the ignition coil from the problem cylinder with one from another cylinder.
  14. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Throttle position
    • CLV (calculated load value)
    • Gear position
  15. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    1. YES -  Go to step 16.
    2. NO -  Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Make sure the coil connections are secure.
  16. Determine which cylinder had the misfire.

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

    1. YES -  Replace the faulty ignition coil (see IGNITION COIL REMOVAL/INSTALLATION ), then go to step  63.
    2. NO -  Go to step 17.
  17. Turn the ignition switch OFF.
  18. Exchange the spark plug from the problem cylinder with one from another cylinder.
  19. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Throttle position
    • CLV (calculated load value)
    • Gear position
  20. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    1. YES -  Go to step 21.
    2. NO -  Intermittent misfire due to spark plug fouling (no misfire at this time).
  21. Determine which cylinder had the misfire.

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

    1. YES -  Replace the faulty spark plug, then go to step  63.
    2. NO -  Go to step 22.
  22. Turn the ignition switch OFF.
  23. Exchange the injector from the problem cylinder with one from another cylinder.
  24. Start the engine, and let it idle for 2 minutes.
  25. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Throttle position
    • CLV (calculated load value)
    • Gear position
  26. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    1. YES -  Go to step 27.
    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.
  27. Determine which cylinder had the misfire.

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

    1. YES -  Replace the faulty injector (see INJECTOR REPLACEMENT  ), then go to step  63.
    2. NO -  Go to step 28.
  28. Turn the ignition switch OFF.
  29. Disconnect the ignition coil 3P connector from the problem cylinder.
  30. Turn the ignition switch ON (II).
  31. Measure voltage between ignition coil 3P connector terminal No. 3 and body ground.
    Fig 1: Measuring Voltage Between Ignition Coil 3P Connector Terminal 3 And Body Ground
    G03650721Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 32.
    2. NO -  Repair open in the wire between the ignition coil and the ignition coil relay, then go to step  63.
  32. Turn the ignition switch OFF.
  33. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground.
    Fig 2: Checking Continuity Between Ignition Coil 3P Connector Terminal 2 And Body Ground
    G03650722Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 34.
    2. NO -  Repair open in the wire between the ignition coil and G101, then go to step  63.
  34. Turn the ignition switch OFF.
  35. Jump the SCS line with the HDS.
  36. Disconnect ECM/PCM connector A (31P).
  37. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 3: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650723Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 A16 YEL/GRN
    No. 2 P0302 A15 BLU/RED
    No. 3 P0303 A14 WHT/BLU
    No. 4 P0304 A13 BRN

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM and the ignition coil, then go to step  63.
    2. NO -  Go to step 38.
  38. Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see table).
    Fig 4: Connecting Appropriate Ignition Coil 3P Connector Terminal 1 To Body Ground With Jumper Wire
    G03650724Courtesy of AMERICAN HONDA MOTOR CO., INC.
    TERMINAL REFERENCE

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 YEL/GRN
    No. 2 P0302 BLU/RED
    No. 3 P0303 WHT/BLU
    No. 4 P0304 BRN
  39. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 5: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650725Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 A16 YEL/GRN
    No. 2 P0302 A15 BLU/RED
    No. 3 P0303 A14 WHT/BLU
    No. 4 P0304 A13 BRN

    Is there continuity? 

    1. YES -  Go to step 40.
    2. NO -  Repair open in the wire between the ECM/PCM and the ignition coil, then go to step  63.
  40. Reconnect the ignition coil 3P connector and ECM/PCM connector A (31P).
  41. Do an engine compression and a cylinder leakdown test.

    Did the engine pass both tests? 

    1. YES -  Go to step 42.
    2. NO -  Repair the engine, then go to step  63.
  42. Do the VTEC rocker arm test (see VTEC ROCKER ARM TEST ).

    Did the VTEC rocker arm pass the test? 

    1. YES -  Go to step  72.
    2. NO -  Repair as necessary, then go to step  63.
  43. Turn the ignition switch OFF.
  44. Jump the SCS line with the HDS.
  45. Disconnect ECM/PCM connector B (24P).
  46. Turn the ignition switch ON (II).
  47. Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 6: Measuring Voltage Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650726Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL

    Is there battery voltage? 

    1. YES -  Go to step  57.
    2. NO -  Go to step 48.
  48. Turn the ignition switch OFF.
  49. Remove the intake manifold cover (see step 1 on REMOVAL - K20A3 ENGINE ).
  50. Disconnect the injector 2P connector from the problem cylinder.
  51. Turn the ignition switch ON (II).
  52. Measure voltage between injector 2P connector terminal No. 1 and body ground.
    Fig 7: Measuring Voltage Between Injector 2P Connector Terminal 1 And Body Ground
    G03650727Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 53.
    2. NO -  Repair open in the wire between the injector and the PGM-FI main relay, then go to step  63.
  53. Turn the ignition switch OFF.
  54. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 8: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650728Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM and the injector, then go to step  63.
    2. NO -  Go to step 55.
  55. Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table).
    Fig 9: Connecting Appropriate Injector 2P Connector Terminal 2 To Body Ground With Jumper Wire
    G03650729Courtesy of AMERICAN HONDA MOTOR CO., INC.
    TERMINAL REFERENCE

    PROBLEM CYLINDER DTC WIRE COLOR
    No. 1 P0301 BRN
    No. 2 P0302 RED
    No. 3 P0303 BLU
    No. 4 P0304 YEL
  56. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).
    Fig 10: Checking Continuity Between Body Ground And Appropriate ECM/PCM Connector Terminal
    G03650730Courtesy of AMERICAN HONDA MOTOR CO., INC.
    ECM/PCM TERMINAL REFERENCE

    PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR
    No. 1 P0301 B5 BRN
    No. 2 P0302 B4 RED
    No. 3 P0303 B3 BLU
    No. 4 P0304 B2 YEL

    Is there continuity? 

    1. YES -  Go to step 57.
    2. NO -  Repair open in the wire between the ECM/PCM and the injector, then go to step  63.
  57. Measure resistance between injector 2P connector terminals No. 1 and No. 2.
    Fig 11: Measuring Resistance Between Injector 2P Connector Terminals 1 And 2
    G03650731Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 10-13 Ω ? 

    1. YES -  Go to step 58.
    2. NO -  Replace the injector (see INJECTOR REPLACEMENT  ), then go to step  63.
  58. Substitute a known-good injector from another cylinder to the problem cylinder.
  59. Reconnect ECM/PCM connector B (24P).
  60. Start the engine, and let it idle for 2 minutes.
  61. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Throttle position
    • CLV (calculated load value)
    • Gear position
  62. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS.

    Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? 

    1. YES -  Go to step  72.
    2. NO -  Replace the original injector (see INJECTOR REPLACEMENT  ), then go to step  63.
  63. Reconnect all connectors.
  64. Turn the ignition switch ON (II).
  65. Reset the ECM/PCM with the HDS.
  66. Clear the CKP pattern with the HDS.
  67. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  68. Do the CKP pattern learn procedure (see ECM/PCM RESET (2005-2006 MODELS) ).
  69. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Throttle position
    • CLV (calculated load value)
    • Gear position
  70. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES -  If DTC P0301, P0302, P0303, or P0304 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go to troubleshooting DTC P0300, P0301, P0302, P0303, or P0304 (see DTC P0300: RANDOM MISFIRE DETECTED AND ANY COMBINATION OF THE FOLLOWING: (2005-2006 MODELS); DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED (2005-2006 MODELS); DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED (2005-2006 MODELS); DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED (2005-2006 MODELS); DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED (2005-2006 MODELS)  ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .
    2. NO -  Go to step 71.
  71. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    1. YES -  Troubleshooting is complete.
    2. NO -  If the screen indicates FAILED, go to step  1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  69 and recheck.
  72. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see HOW TO UPDATE THE ECM/PCMHOW TO UPDATE THE ECM/PCM ).
  73. Test-drive the vehicle for several minutes in the range of the recorded freeze data.
  74. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES -  If DTC P0301, P0302, P0303, or P0304 are indicated, check for poor connections or loose terminals at the injector, the ignition coil, and the ECM/PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .
    2. NO -  If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ).
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