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Alternator Control Circuit Troubleshooting

  1. Check for proper operation of the Electrical Load Detector (ELD) by checking the Malfunction Indicator Lamp (MIL) (see IF THE MIL (MALFUNCTION INDICATOR LAMP) HAS COME ON ).
  2. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC), and check for DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). If a DTC is present, diagnose and repair the cause before continuing with this test.
  3. Disconnect the engine wire harness 8P connector from the starter subharness 8P connector.
  4. Start the engine, and turn on the headlights to high beam.
  5. Measure the voltage between the engine wire harness 8P connector terminal No. 3 and the positive terminal of the battery.
    Fig 1: Measuring Voltage Between Engine Wire Harness 8P Connector Terminal
    G03673512Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 1 V or less? 

    1. YES -  Go to step  9.
    2. NO -  Go to step 6.
  6. Jump the SCS line with the HDS, then turn the ignition switch OFF.
    NOTE: This step must be done to protect the engine control module (ECM)/powertrain control module (PCM) from damage.
  7. Disconnect ECM/PCM connector B (24P).
  8. Check for continuity between ECM/PCM connector terminal B18 and body ground.
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminal B18 And Body Ground
    G03673513Courtesy 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 -  Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ), or substitute a known-good ECM/PCM (see HOW TO SUBSTITUTE 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 ).
  9. Jump the SCS line with the HDS, then turn the ignition switch OFF.
    NOTE: This step must be done to protect the engine control module (ECM)/powertrain control module (PCM) from damage.
  10. Disconnect ECM/PCM connector B (24P).
  11. Check for continuity between ECM/PCM connector terminal B18 and engine wire harness 8P connector terminal No. 3.
    Fig 3: Checking Continuity Between ECM/PCM Connector Terminal B18 And Engine Wire Harness 8P Connector Terminal
    G03673514Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Replace the alternator (see ALTERNATOR REMOVAL AND INSTALLATION  ).
    2. NO -  Repair an open in the wire between the alternator and the ECM/PCM.
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