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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 68 (PGM-FI SYSTEM)MIL CIRCUIT TROUBLESHOOTING
2002 Honda Civic Si

MIL Circuit Troubleshooting

2002 Honda Civic SiSECTION MIL Circuit Troubleshooting
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).
  2. Turn the ignition switch ON (II), and read the HDS.

    Does the HDS communicate with the PCM?, 

    1. YES  - Go to step 3.
    2. NO  - Go to DLC Circuit Troubleshooting (see DLC CIRCUIT TROUBLESHOOTING  ).
  3. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or 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).

    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 always comes on and stays on, go to step  22. But if the MIL sometimes works normally, first check for these problems.
      • An intermittent short in the wire between the PCM (B54) and the data link connector (DLC) connector.
      • An intermittent short in the wire between the PCM (B5) and the gauge assembly.
    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. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse in the driver's under-dash fuse/ relay box.
      • A loose No. 46 ACG S (15 A) fuse in the under-hood fuse/relay box.
      • A loose No. 1 FUEL PUMP (15 A) fuse in the driver's under-dash fuse/relay box.
      • A poor connection at PCM terminal B5.
      • An intermittent open in the GRN/ORN wire between the PCM (B5) and the gauge assembly.
      • An intermittent short in the wire between the PCM (A7) and the manifold absolute pressure (MAP) sensor, the output shaft (countershaft) speed sensor.
      • An intermittent short in the wire between the PCM (A27) and the exhaust gas recirculation (EGR) valve position sensor, the input shaft (mainshaft) speed sensor, or the intake manifold tuning (IMT) (intake manifold runner control (IMRC)) actuator.
      • An intermittent short in the wire between the PCM (B43) and APP sensor A.
      • An intermittent short in the wire between the PCM (B29) and APP sensor B.
      • An intermittent short in the wire between the PCM (B46) and the fuel tank pressure (FTP) sensor.
  6. Turn the ignition switch OFF and then ON (II) again. Is the low oil pressure light on?
    1. YES  - Go to step 7.
    2. NO  - Check for these problems:
      • A blown No. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse in the driver's under-dash fuse/relay box.
      • A short or open in the wire between No. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse and the gauge assembly.
  7. Try to start the engine.

    Does the engine start? 

    1. YES  - Go to step 8.
    2. NO  - Go to step  12.
  8. Turn the ignition switch OFF.
  9. Disconnect PCM connector B (56P).
  10. Connect PCM connector terminal B5 to body ground with a jumper wire.
    Fig 1: Connecting PCM Connector Terminal B5 To Body Ground With Jumper Wire
    G03639809Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Turn the ignition switch ON (II).

    Is the MIL on? 

    1. YES  - Substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ) and recheck. If the symptom/indication goes away, replace the original PCM (see PCM REPLACEMENT  ).
    2. NO  - Check for an open in the wire between the PCM (B5) and the gauge assembly. Also check for a blown MIL bulb.
  12. Turn the ignition switch OFF.
  13. Inspect the No. 46 ACGS (15 A) fuse in the under-hood fuse/relay box.

    Is the fuse OK? 

    1. YES  - Go to step 14.
    2. NO  - Check for these problems:
      • A short in the wire between the No. 46 ACGS (15 A) fuse and the PGM-FI main relay.
      • A short in the wire between the PGM-FI main relay and the PCM, injectors, CKP sensors or CMP sensor.
  14. Inspect the No. 1 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    1. YES  - Go to step 15.
    2. NO  - Check for these problems:
      • A short in the wire between the No. 1 FUEL PUMP (15 A) fuse and the PGM-FI main relay.
      • A short in the wire between the PGM-FI main relay and the fuel pump.
      • A faulty PGM-FI main relay or a faulty fuel pump.
  15. Disconnect PCM connectors A (73P) and B (56P).
  16. Check for continuity between body ground and PCM connector terminals A7, A27, B29, B43, and B46 individually.
    Fig 2: Checking Continuity Between Body Ground And PCM Connector Terminals A7 And A27
    G03639810Courtesy of AMERICAN HONDA MOTOR CO., INC.
RENDER: 1.0x

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