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K20A3 Engine (2002-2004 Models)

  1. Turn the ignition switch ON (II).

    Does the charging system indicator come on? 

    1. YES -  Go to step 2.
    2. NO -  Go to step  3.
  2. Start the engine.

    Does the charging system indicator go off? 

    1. YES -  Charging system indicator circuit is OK. Go to the Alternator and Regulator Circuit Troubleshooting (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING  ).
    2. NO -  Go to step 3.
  3. Do the gauge assembly self-diagnostic function procedure (see SELF-DIAGNOSTIC FUNCTION ).

    Does the charging system indicator flash? 

    1. YES -  Go to step 4.
    2. NO -  Replace the gauge assembly (see GAUGE ASSEMBLY REPLACEMENT ).
  4. Turn the ignition switch OFF.
  5. Disconnect the engine wire harness 8P connector from the starter subharness 8P connector.
  6. Turn the ignition switch ON (II).
  7. Measure the voltage between engine wire harness 8P connector terminal No. 4 and body ground.
    Fig 1: Measuring Voltage Between Engine Wire Harness 8P Connector Terminal No. 4 And Body Ground
    G03650052Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 8.
    2. NO -  Check for a blown No. 4 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair an open in the wire between the alternator and underdash fuse/relay box.
  8. Turn the ignition switch OFF.
    NOTE: This step must be done to protect the engine control module (ECM)/powertrain control module (PCM) from damage.
  9. Disconnect ECM/PCM connector B (24P).
  10. Check for continuity between ECM/PCM connector terminal B10 and engine wire harness 8P connector terminal No. 8.
    Fig 2: Checking For Continuity Between ECM/PCM Connector Terminal B10 And Engine Wire Harness 8P Connector Terminal No. 8
    G03650053Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 11.
    2. NO -  Repair an open in the wire between the alternator and the ECM/PCM.
  11. Check for continuity between ECM/PCM connector terminal B10 and body ground.
    Fig 3: Checking For Continuity Between ECM/PCM Connector Terminal B10 And Body Ground
    G03650054Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair a short in the wire between the alternator and the ECM/PCM.
    2. NO -  Go to the Alternator and Regulator Circuit Troubleshooting (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING  ).
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