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2002-2004 models

  1. Connect a scan tool or the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
  2. Turn the ignition switch ON (II) and read a scan tool or the HDS.

    Does a scan tool or the HDS communicate with the ECM/PCM? 

    1. YES -  Go to step 3.
    2. NO -  Go to troubleshooting "DLC Circuit Troubleshooting" (see DLC CIRCUIT TROUBLESHOOTING  ).
  3. Check a scan tool or the HDS for DTCs.

    Are any DTCs indicated? 

    1. YES -  go to the indicated DTC'S TROUBLESHOOTING .
    2. NO -  Go to step 4.
  4. Turn the ignition switch OFF.
  5. Turn the ignition switch ON (II) and watch the malfunction indicator lamp (MIL).

    Does the MIL come on and stay on for more than 20 seconds? 

    1. YES -  If the MIL stays on, go to step  74. But if the MIL sometimes works normally, first check for these problems.
      • An intermittent short in the wire between the ECM/PCM (E29) and the data link connector (DLC).
      • An intermittent short in the wire between the ECM/PCM (E31) and the gauge assembly.
      • The readiness codes are not set (see HOW TO SET READINESS CODES ). (This is indicated if the MIL blinks 5 times after you turn the ignition switch ON (II) and wait about 20 seconds.)
    2. NO -  If the MIL is always off, go to step 6. But if the MIL sometimes works normally, first check for these problems:
      • A loose No. 10 METER (7.5 A) fuse in the underdash fuse/relay box.
      • A loose No. 20 IG (USA: 40 A, Canada: 50 A) fuse in the underhood fuse/relay box.
      • A loose No. 6 ECU (ECM/PCM) (15 A) fuse in the underhood fuse/relay box.
      • A loose No. 17 FUEL PUMP (15 A) fuse in the underdash fuse/relay box.
      • A poor connection at ECM/PCM terminal E31.
      • An intermittent open in the GRN/ORN wire between the ECM/PCM (E31) and the gauge assembly.
      • An intermittent short in the wire between the ECM/PCM (A21) and the manifold absolute pressure (MAP) sensor, intake manifold tuning (IMT) (intake manifold runner control (IMRC)) valve position sensor, or output shaft (countershaft) speed sensor (A/T).
      • An intermittent short in the wire between the ECM/PCM (A20) and the throttle position (TP) sensor, input shaft (mainshaft) speed sensor (A/T).
      • An intermittent short in the wire between the ECM/PCM (E5) and the fuel tank pressure (FTP) sensor.
  6. Check the low oil pressure indicator (with the ignition switch ON).

    Is the low oil pressure indicator on? 

    1. YES -  Go to step  9.
    2. NO -  Go to step 7.
  7. Inspect the No. 10 METER (7.5 A) fuse in the underdash fuse/relay box.

    Is the fuse OK? 

    1. YES -  Go to step 8.
    2. NO -  Repair short in the wire between No. 10 METER (7.5 A) fuse and the gauge assembly. Also replace the No. 10 METER (7.5 A) fuse.
  8. Inspect the No. 20 IG (USA: 40 A, Canada: 50 A) fuse in the underhood fuse/relay box.

    Is the fuse OK? 

    1. YES -  Repair open in the wire between the No. 20 IG (USA: 40 A, Canada: 50 A) fuse and the gauge assembly. If the wires are OK, test the ignition switch (see IGNITION KEY SWITCH TEST ).
    2. NO -  Repair short in the wire between No. 20 IG (USA: 40 A, Canada: 50 A) fuse and the underdash fuse/relay box. Also replace the No. 20 IG (USA: 40 A, Canada: 50 A) fuse.
  9. Try to start the engine.

    Does the engine start? 

    1. YES -  Go to step 10.
    2. NO -  Go to step  13.
  10. Turn the ignition switch OFF.
  11. Connect ECM/PCM connector terminal E31 to body ground with a jumper wire.
    Fig 1: Connecting ECM/PCM Connector Terminal E31 To Body Ground With Jumper Wire
    G03650814Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Turn the ignition switch ON (II).

    Is the MIL on? 

    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 -  Check for an open in the wire between the ECM/PCM (E31) and the gauge assembly. Also check for a blown MIL bulb. If the wires and the bulb are OK, replace the gauge assembly.
  13. Turn the ignition switch OFF.
  14. Inspect the No. 6 ECU (ECM/PCM) (15 A) fuse in the underhood fuse/relay box.

    Is the fuse OK? 

    1. YES -  Go to step  22.
    2. NO -  Go to step 15.
  15. Remove the blown No. 6 ECU (ECM/PCM) (15 A) fuse in the underdash fuse/relay box.
  16. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).
  17. Remove PGM-FI main relay 1 (Fl MAIN) (A).
    Fig 2: Removing PGM-FI Main Relay 1
    G03650815Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Check for continuity between body ground and the PGM-FI main relay 1 (Fl MAIN) 4P connector terminals No. 2 and No. 4 individually.
    Fig 3: Checking Continuity Between Body Ground And PGM-FI Main Relay 1 (Fl Main) 4P Connector Terminals 2 And 4
    G03650816Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the No. 6 ECU (ECM/PCM) (15 A) fuse and PGM-FI main relay 1 (Fl MAIN). Also replace the No. 6 ECU (ECM/PCM) (15 A) fuse.
    2. NO -  Go to step 19.
  19. Disconnect each of the components or connectors below, one at a time, and check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 1 and body ground.
    • PGM-FI main relay 2 (FUEL PUMP)
    • ECM/PCM connector A (31P)
    • Each injector 2P connector
    • Idle air control (IAC) valve 3P connector
    • Camshaft position (CMP) sensor B 3P connector
    • Crankshaft position (CKP) sensor 3P connector
    • Immobilizer control unit
      Fig 4: Checking Continuity Between PGM-FI main relay 1 (Fl MAIN) 4P Connector Terminal 1 And Body Ground
      G03650817Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 20.
    2. NO -  Replace the component that made the short to body ground go away when disconnected. If the item is the ECM/PCM, 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  ).

      Also replace the No. 6 ECU (ECM/PCM) (15 A) fuse.

  20. Disconnect the connectors of these components:
    • PGM-FI main relay 2 (FUEL PUMP)
    • ECM/PCM connector A (31P)
    • Injectors
    • Idle air control (IAC) valve
    • Camshaft position (CMP) sensor B
    • Crankshaft position (CKP) sensor
    • Immobilizer control unit
  21. Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 1 and body ground.
    Fig 5: Checking Continuity Between PGM-FI Main Relay 1 (FL MAIN) 4P Connector Terminal 1 And Body Ground
    G03650818Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between PGM-FI main relay 1 (Fl MAIN) and each item. Also replace the No. 6 ECU (ECM/PCM) (15 A) fuse.
    2. NO -  Replace PGM-FI main relay 1 (Fl MAIN). Also replace the No. 6 ECU (ECM/PCM) (15 A) fuse.
  22. Inspect the No. 17 FUEL PUMP (15 A) fuse in the underdash fuse/relay box.

    Is the fuse OK? 

    1. YES -  Go to step  34.
    2. NO -  Go to step 23.
  23. Remove the blown No. 17 FUEL PUMP (15 A) fuse in the underdash fuse/relay box.
  24. Disconnect ECM/PCM connector E (31P).
  25. Check for continuity between ECM/PCM connector terminal E9 and body ground.
    Fig 6: Checking Continuity Between ECM/PCM Connector Terminal E9 And Body Ground
    G03650819Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 26.
    2. NO -  Replace the No. 17 FUEL PUMP (15 A) fuse, and update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ).
  26. Remove PGM-FI main relay 2 (FUEL PUMP) (A).
    Fig 7: Removing PGM-FI Main Relay 2 (Fuel Pump)
    G03650820Courtesy of AMERICAN HONDA MOTOR CO., INC.
  27. Check for continuity between ECM/PCM connector terminal E9 and body ground.
    Fig 8: Checking Continuity Between ECM/PCM Connector Terminal E9 And Body Ground
    G03650821Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the No. 17 FUEL PUMP (15 A) fuse and the ECM/PCM (E9), or the No. 17 FUEL PUMP (15 A) fuse and PGM-FI main relay 2 (FUEL PUMP) or the No. 17 fuel pump fuse (15 A) and the SRS unit. Also replace the No. 17 FUEL PUMP (15 A) fuse.
    2. NO -  Go to step 28.
  28. Remove the rear seat cushion (see REAR SEAT REMOVAL/INSTALLATION ).
  29. Remove the access panel from the floor.
  30. Disconnect the fuel pump 5P connector.
  31. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground.
    Fig 9: Checking Continuity Between Fuel Pump 5P Connector Terminal 5 And Body Ground
    G03650822Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the fuel pump and PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 17 FUEL PUMP (15 A) fuse.
    2. NO -  Go to step 32.
  32. Reinstall PGM-FI main relay 2 (FUEL PUMP) (A).
    Fig 10: Installing PGM-FI Main Relay 2 (Fuel Pump)
    G03650823Courtesy of AMERICAN HONDA MOTOR CO., INC.
  33. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground.
    Fig 11: Checking Continuity Between Fuel Pump 5P Connector Terminal 5 And Body Ground
    G03650824Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Replace PGM-FI main relay 2 (FUEL PUMP). Also replace the No. 17 FUEL PUMP (15 A) fuse.
    2. NO -  Check the fuel pump, and replace it if necessary. Also replace the No. 17 FUEL PUMP (15 A) fuse.
  34. Disconnect ECM/PCM connector E (31P).
  35. Turn the ignition switch ON (II).
  36. Measure voltage between ECM/PCM connector terminal E9 and body ground.
    Fig 12: Measuring Voltage Between ECM/PCM Connector Terminal E9 And Body Ground
    G03650825Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 37.
    2. NO -  Repair open in the wire between the No. 17 FUEL PUMP (15 A) fuse and the ECM/PCM (E9).
  37. Turn the ignition switch OFF.
  38. Measure voltage between ECM/PCM connector terminal E7 and body ground.
    Fig 13: Measuring Voltage Between ECM/PCM Connector Terminal E7 And Body Ground
    G03650826Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 42.
    2. NO -  Go to step 39.
  39. Remove PGM-FI main relay 1 (Fl MAIN) (A).
    Fig 14: Removing PGM-FI Main Relay 1 (Fl Main)
    G03650827Courtesy of AMERICAN HONDA MOTOR CO., INC.
  40. Measure voltage between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 4 and body ground.
    Fig 15: Measuring Voltage Between PGM-FI Main Relay 1 (Fl Main) 4P Connector Terminal 4 And Body Ground
    G03650828Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 41.
    2. NO -  Repair open in the wire between the No. 6 ECU (ECM/PCM) (15 A) fuse and PGM-FI main relay 1 (FI MAIN).
  41. Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 3 and ECM/PCM connector terminal E7.
    Fig 16: Checking Continuity Between PGM-FI Main Relay 1 (Fl Main) 4P Connector Terminal 3 And ECM/PCM Connector Terminal E7
    G03650829Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Test PGM-FI main relay 1 (Fl MAIN) (see POWER RELAY TEST ). If the relay is OK, 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 open in the wire between PGM-FI main relay 1 (Fl MAIN) and the ECM/PCM (E7).
  42. Reconnect ECM/PCM connector E (31P).
  43. Turn the ignition switch ON (II).
  44. Measure voltage between body ground and ECM/PCM connector terminals A2 and A3 individually.
    Fig 17: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminals A2 And A3
    G03650830Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step  47.
    2. NO -  Go to step 45.
  45. Turn the ignition switch OFF.
  46. Remove PGM-FI main relay 1 (Fl MAIN) (A).
    Fig 18: Removing PGM-FI Main Relay 1 (Fl Main)
    G03650831Courtesy of AMERICAN HONDA MOTOR CO., INC.
  47. Turn the ignition switch ON (II).
  48. Measure voltage between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 2 and body ground.
    Fig 19: Measuring Voltage Between PGM-FI Main Relay 1 (Fl Main) 4P Connector Terminal 2 And Body Ground
    G03650832Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 49.
    2. NO -  Repair open in the wire between the No. 6 ECU (ECM/PCM) (15 A) fuse and PGM-FI main relay 1 (FI MAIN).
  49. Turn the ignition switch OFF.
  50. Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 1 and ECM/PCM connector terminals A2 and A3 individually.
    Fig 20: Checking Continuity Between PGM-FI Main Relay 1 (Fl Main) 4P Connector Terminal 1 And ECM/PCM Connector Terminals A2 And A3
    G03650833Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Replace PGM-FI main relay 1 (FI MAIN).
    2. NO -  Repair open in the wire between PGM-FI main relay 1 (Fl MAIN) and the ECM/PCM (A2, A3).
  51. Measure voltage between body ground and ECM/PCM connector terminals A4, A5, A23, and A24 individually.
    Fig 21: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminals A4, A5, A23, And A24
    G03650834Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there more than 0.2 V? 

    1. YES -  Repair open in the wire(s) that had more than 0.2 V between G101 and the ECM/PCM (A4, A5, A23, A24).
    2. NO -  Go to step 52.
  52. Measure voltage between body ground and ECM/PCM connector terminal A21.
    Fig 22: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminal A21
    G03650835Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES -  Go to step  59.
    2. NO -  Go to step 53.
  53. Turn the ignition switch OFF.
  54. Disconnect the 3P connector from each of these sensors, one at a time, and measure voltage between body ground and ECM/PCM connector terminal A21 with the ignition switch ON (II).
    • Manifold absolute pressure (MAP) sensor
    • Intake manifold tuning (intake manifold runner control (IMRC)) valve position sensor (K20A3 engine)
    • Output shaft (countershaft) speed sensor (A/T)
      Fig 23: Identifying ECM/PCM Connector Terminal
      G03650836Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES -  Replace the sensor that restored 5 V when disconnected.
    2. NO -  Go to step 55.
  55. Turn the ignition switch OFF.
  56. Disconnect the 3P connectors from these sensors:
    • Manifold absolute pressure (MAP) sensor
    • Intake manifold tuning (intake manifold runner control (IMRC)) valve position sensor (K20A3 engine)
    • Output shaft (countershaft) speed sensor (A/T)
  57. Disconnect ECM/PCM connector A (31P).
  58. Check for continuity between ECM/PCM connector terminal A21 and body ground.
    Fig 24: Checking Continuity Between ECM/PCM Connector Terminal A21 And Body Ground
    G03650837Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM (A21) and the MAP sensor, the IMT (IMRC) valve position sensor, or the output shaft (countershaft) speed sensor (A/T).
    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  ).
  59. Measure voltage between body ground and ECM/PCM connector terminal A20.
    Fig 25: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminal A20
    G03650838Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES -  Go to step  66.
    2. NO -  Go to step 60.
  60. Turn the ignition switch OFF.
  61. Disconnect the 3P connector from each of these sensors, one at a time, and measure voltage between body ground and ECM/PCM connector terminal A20 with the ignition switch ON (II).
    • Throttle position (TP) sensor
    • Input shaft (mainshaft) speed sensor (A/T)
      Fig 26: Identifying ECM/PCM Connector Terminal
      G03650839Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES -  Replace the sensor that restored 5 V when disconnected.
    2. NO -  Go to step 62.
  62. Turn the ignition switch OFF.
  63. Disconnect the 3P connectors from these sensors:
    • Throttle position (TP) sensor
    • Input shaft (mainshaft) speed sensor (A/T)
  64. Disconnect ECM/PCM connector A (31P).
  65. Check for continuity between ECM/PCM connector terminal A20 and body ground.
    Fig 27: Checking Continuity Between ECM/PCM Connector Terminal A20 And Body Ground
    G03650840Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM (A20) and the TP sensor or input shaft (mainshaft) speed sensor (A/T).
    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  ).
  66. Measure voltage between body ground and ECM/PCM connector terminal E5.
    Fig 28: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminal E5
    G03650841Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    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 -  Go to step 67.
  67. Turn the ignition switch OFF.
  68. Disconnect the fuel tank pressure (FTP) sensor 3P connector.
  69. Turn the ignition switch ON (II).
  70. Measure voltage between body ground and ECM/PCM connector terminal E5.
    Fig 29: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminal E5
    G03650842Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES -  Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).
    2. NO -  Go to step 71.
  71. Turn the ignition switch OFF.
  72. Disconnect ECM/PCM connector E (31P).
  73. Check for continuity between ECM/PCM connector terminal E5 and body ground.
    Fig 30: Checking Continuity Between ECM/PCM Connector Terminal E5 And Body Ground
    G03650843Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM/PCM (E5) and the FTP sensor.
    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  ).
  74. Turn the ignition switch OFF.
  75. Turn the ignition switch ON (II).
  76. Measure voltage between ECM/PCM connector terminal E29 and body ground.
    Fig 31: Measuring Voltage Between ECM/PCM Connector Terminal E29 And Body Ground
    G03650844Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V (or battery voltage)? 

    1. YES -  Go to step  80.
    2. NO -  Go to step 77.
  77. Turn the ignition switch OFF.
  78. Disconnect ECM/PCM connector E (31P).
  79. Check for continuity between ECM/PCM connector terminal E29 and body ground.
    Fig 32: Checking Continuity Between ECM/PCM Connector Terminal E29 And Body Ground
    G03650845Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the DLC and the ECM/PCM (E29).
    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  ).
  80. Turn the ignition switch OFF.
  81. Disconnect ECM/PCM connector E (31P).
  82. Turn the ignition switch ON (II).

    Is the MIL on? 

    1. YES -  Repair short in the wire between the gauge assembly and the ECM/PCM (E31). If the wires are OK, replace the gauge assembly.
    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  ).
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