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MIL Circuit Troubleshooting

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

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

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

    Are any DTCs indicated? 

    1. YES  - Go to the indicated DTCs 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 after turning the ignition switch ON (II)? 

    1. YES  - If the MIL comes on and 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 five 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 (7.5A) fuse in the underdash fuse/relay box.
      • A loose No. 20 IG (50A) fuse in the under-hood fuse/relay box.
      • A loose No. 6 ECU (ECM/PCM) (15A) fuse in the under-hood fuse/relay box.
      • A loose No. 17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box.
      • A poor connection at ECM/PCM terminal E31.
      • An intermittent open in the GRN/WHT 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 runner control (IMRC) valve position sensor, or countershaft speed sensor (A/T).
      • An intermittent short in the wire between the ECM/PCM (A20) and the throttle position (TP) sensor, or 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 light (with the ignition switch ON).

    Is the low oil pressure light on? 

    1. YES  - Go to step  9.
    2. NO  - Go to step 7.
  7. Inspect the No. 10 METER (7.5A) 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 (7.5A) fuse and the gauge assembly. Also replace the No. 10 METER (7.5A) fuse.
  8. Inspect the No. 20 IG (50A) fuse in the under-hood fuse/relay box.

    Is the fuse OK? 

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

    Does the engine start? 

    1. YES  - Go to step 10.
    2. NO  - Go to step  12.
  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
    G01475522Courtesy 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
    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) (15A) fuse in the under-hood 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) (15A) fuse in the under-dash fuse/relay box.
  16. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).
  17. Remove PGM-FI main relay 1 (A).
    Fig 2: Removing PGM-FI Main Relay 1
    G01475523Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 2 and No. 4 individually.
    Fig 3: Checking Continuity Between Body Ground & PGM-FI Main Relay 1 4-Pin Connector Terminals No. 2 & No. 4
    G01475524Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the No. 6 ECU (ECM/PCM) (15A) fuse and PGM-FI main relay 1. Also replace the No. 6 ECU (ECM/PCM) (15A) 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 4P connector terminal No. 1 and body ground.
    • PGM-FI main relay 2
    • ECM/PCM connector A (31P)
    • Each injector 2P connector
    • Idle air control (IAC) valve 3P connector
    • Camshaft position (CMP) sensor (Top dead center (TDC) sensor) 3P connector
    • Crankshaft position (CKP) sensor 3P connector
      Fig 4: Checking Continuity Between PGM-FI Main Relay 1 4-Pin Connector Terminal No. 1 & Body Ground
      G01475525Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Did the continuity go away when one of the components or connectors was disconnected? 

    1. YES  - 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

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

    2. NO  - Go to step 20.
  20. Disconnect the connectors of all these components.
    • PGM-FI main relay 2
    • ECM/PCM connector A (31P)
    • Injectors
    • Idle air control (IAC) valve
    • Camshaft position (CMP) sensor (Top dead center (TDC) sensor)
    • Crankshaft position (CKP) sensor
  21. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 1 and body ground.
    Fig 5: Checking Continuity Between PGM-FI Main Relay 1 4-Pin Connector Terminal No. 1 & Body Ground
    G01475526Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PGM-FI main relay 1 and each item. Also replace the No. 6 ECU (ECM/PCM) (15A) fuse.
    2. NO  - Replace PGM-FI main relay 1. Also replace the No. 6 ECU (ECM/PCM) (15A) fuse.
  22. Inspect the No. 17 FUEL PUMP (15A) fuse in the under-dash 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 (15A) fuse.
  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 & Body Ground
    G01475527Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 26.
    2. NO  - Replace the No. 17 FUEL PUMP (15A) fuse, and update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  26. Make sure the SRS has no DTC. If there is any DTC, troubleshoot them first (see General Troubleshooting Information .
  27. Remove PGM-FI main relay 2 (A).
    Fig 7: Removing PGM-FI Main Relay 2
    G01475528Courtesy of AMERICAN HONDA MOTOR CO., INC.
  28. Disconnect the SRS unit connectors (see SRS Unit Replacement .
  29. Check for continuity between ECM/PCM connector terminal E9 and body ground.
    Fig 8: Checking Continuity Between ECM/PCM Connector Terminal E9 & Body Ground
    G01475529Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the No. 17 FUEL PUMP (15A) fuse and the ECM/PCM (E9), or between the No. 17 FUEL PUMP (15A) fuse and PGM-FI main relay 2. Also replace the No. 17 FUEL PUMP (15A) fuse.
    2. NO  - Go to step 30.
  30. Fold the rear seats forward, and pull back the carpet to expose the access panel.
  31. Remove the access panel from the floor.
  32. Disconnect the fuel pump 5P connector
  33. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground.
    Fig 9: Checking Continuity Between Fuel Pump 5-Pin Connector Terminal No. 5 & Body Ground
    G01475530Courtesy 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. Also replace the No. 17 FUEL PUMP (15A) fuse.
    2. NO  - Go to step 34.
  34. Reinstall PGM-FI main relay 2 (A).
    Fig 10: Reinstalling PGM-FI Main Relay 2
    G01475531Courtesy of AMERICAN HONDA MOTOR CO., INC.
  35. Check for continuity between fuel pump 5P connector terminal No. 5 and body ground.
    Fig 11: Checking Continuity Between Fuel Pump 5-Pin Connector Terminal No. 5 & Body Ground
    G01475532Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Replace PGM-FI main relay 2. Also replace the No. 17 FUEL PUMP (15A) fuse.
    2. NO  - Check the fuel pump, and replace it if necessary. Also replace the No. 17 FUEL PUMP (15A) fuse.
  36. Disconnect ECM/PCM connector E (31P).
  37. Turn the ignition switch ON (II).
  38. Measure voltage between ECM/PCM connector terminal E9 and body ground.
    Fig 12: Measuring Voltage Between ECM/PCM Connector Terminal E9 & Body Ground
    G01475533Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 39.
    2. NO  - Repair open in the wire between the No. 17 FUEL PUMP (15A) fuse and the ECM/PCM (E9).
  39. Measure voltage between ECM/PCM connector terminal E7 and body ground.
    Fig 13: Measuring Voltage Between ECM/PCM Connector Terminal E7 & Body Ground
    G01475534Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step  44.
    2. NO  - Go to step 40.
  40. Turn the ignition switch OFF.
  41. Remove PGM-FI main relay 1 (A).
    Fig 14: Removing PGM-FI Main Relay 1
    G01475535Courtesy of AMERICAN HONDA MOTOR CO., INC.
  42. Measure voltage between PGM-FI main relay 1 4P connector terminal No. 4 and body ground.
    Fig 15: Measuring Voltage Between PGM-FI Main Relay 1 4-Pin Connector Terminal No. 4 & Body Ground
    G01475536Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 43.
    2. NO  - Repair open in the wire between the No. 6 ECU (ECM/PCM) (15A) fuse and PGM-FI main relay 1.
  43. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 3 and ECM/PCM connector terminal E7.
    Fig 16: Checking Continuity Between PGM-FI Main Relay 1 4-Pin Connector Terminal No. 3 & ECM/PCM Connector Terminal E7
    G01475537Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Test PGM-FI main relay 1 (see RELAYS ). If the relay is OK, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
    2. NO  - Repair open in the wire between PGM-FI main relay 1 and the ECM/PCM (E7).
  44. Reconnect ECM/PCM connector E (31P).
  45. Turn the ignition switch ON (II).
  46. Measure voltage between body ground and ECM/PCM connector terminals A2 and A3 individually.
    Fig 17: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminals A2 & A3
    G01475538Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step  53.
    2. NO  - Go to step 47.
  47. Turn the ignition switch OFF.
  48. Remove PGM-FI main relay 1 (A).
    Fig 18: Removing PGM-FI Main Relay 1
    G01475539Courtesy of AMERICAN HONDA MOTOR CO., INC.
  49. Turn the ignition switch ON (II).
  50. Measure voltage between PGM-FI main relay 1 4P connector terminal No. 2 and body ground.
    Fig 19: Measuring Voltage Between PGM-FI Main Relay 1 4-Pin Connector Terminal No. 2 & Body Ground
    G01475540Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 51.
    2. NO  - Repair open in the wire between the No. 6 ECU (ECM/PCM) (15A) fuse and PGM-FI main relay 1.
  51. Turn the ignition switch OFF.
  52. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 1 and ECM/PCM connector terminals A2 and A3 individually.
    Fig 20: Checking Continuity Between PGM-FI Main Relay 1 4-Pin Connector Terminal No. 1 & ECM/PCM Connector Terminals A2 & A3
    G01475541Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Replace PGM-FI main relay 1.
    2. NO  - Repair open in the wire between PGM-FI main relay 1 and the ECM/PCM (A2, A3).
  53. Measure voltage between body ground and ECM/PCM connector terminals A4, A5, A23, and A24 individually.
    Fig 21: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminals A4, A5, A23, & A24
    G01475542Courtesy 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 54.
  54. Measure voltage between body ground and ECM/PCM connector terminal A21.
    Fig 22: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal A21
    G01475543Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  - Go to step  61.
    2. NO  - Go to step 55.
  55. Turn the ignition switch OFF.
  56. 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 runner control (IMRC) valve position sensor
    • Output shaft (countershaft) speed sensor (A/T)
      Fig 23: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal A21
      G01475544Courtesy 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 57.
  57. Turn the ignition switch OFF.
  58. Disconnect the 3P connector from these sensors:
    • Manifold absolute pressure (MAP) sensor
    • Intake manifold runner control (IMRC) valve position sensor
    • Output shaft (countershaft) speed sensor (A/T)
  59. Disconnect ECM/PCM connector A (31P).
  60. Check for continuity between ECM/PCM connector terminal A21 and body ground.
    Fig 24: Checking Continuity Between ECM/PCM Connector Terminal A21 & Body Ground
    G01475545Courtesy 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 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  61. Measure voltage between body ground and ECM/PCM connector terminal A20.
    Fig 25: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal A20
    G01475546Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  - Go to step  68.
    2. NO  - Go to step 62.
  62. Turn the ignition switch OFF.
  63. Disconnect the 3P connector from each of the following 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: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal A20
      G01475547Courtesy 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 64.
  64. Turn the ignition switch OFF.
  65. Disconnect the 3P connector from these sensors:
    • Throttle position (TP) sensor
    • Input shaft (mainshaft) speed sensor (A/T)
  66. Disconnect ECM/PCM connector A (31P).
  67. Check for continuity between ECM/PCM connector terminal A20 and body ground.
    Fig 27: Checking Continuity Between ECM/PCM Connector Terminal A20 & Body Ground
    G01475548Courtesy 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  68. Measure voltage between body ground and ECM/PCM connector terminal E5.
    Fig 28: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal E5
    G01475549Courtesy 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
    2. NO  - Go to step 69.
  69. Turn the ignition switch OFF.
  70. Disconnect the fuel tank pressure (FTP) sensor 3P connector.
  71. Turn the ignition switch ON (II).
  72. Measure voltage between body ground and ECM/PCM connector terminal E5.
    Fig 29: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal E5
    G01475550Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  - Replace the FTP sensor.
    2. NO  - Go to step 73.
  73. Turn the ignition switch OFF.
  74. Disconnect ECM/PCM connector E (31P).
  75. Check for continuity between ECM/PCM connector terminal E5 and body ground.
    Fig 30: Checking Continuity Between ECM/PCM Connector Terminal E5 & Body Ground
    G01475551Courtesy 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  76. Turn the ignition switch OFF.
  77. Turn the ignition switch ON (II).
  78. Measure voltage between ECM/PCM connector terminal E29 and body ground.
    Fig 31: Measuring Voltage Between ECM/PCM Connector Terminal E29 & Body Ground
    G01475552Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V (or battery voltage)? 

    1. YES  - Go to step  82.
    2. NO  - Go to step 79.
  79. Turn the ignition switch OFF.
  80. Disconnect ECM/PCM connector E (31P).
  81. Check for continuity between ECM/PCM connector terminal E29 and body ground.
    Fig 32: Checking Continuity Between ECM/PCM Connector Terminal E29 & Body Ground
    G01475553Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the DLC and the ECM/PCM (E29), the SRS unit, or the ABS modulator-control unit.
    2. NO  - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  82. Turn the ignition switch OFF.
  83. Disconnect ECM/PCM connector E (31P).
  84. 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, then recheck (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
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