| 1. | Connect the Honda Diagnostic System (HDS) to the data link connector (DLC). |
| 2. | Turn the ignition switch ON (II). |
| 3. | Make sure the HDS communicates with the vehicle and the ECM/PCM. If it doesn't, troubleshoot the DLC circuit. |
| 4. | Check for DTCs . If a DTC is present, diagnose and repair the cause before continuing with this test. |
| 5. | Disconnect the alternator 4P connector from the alternator. |
| 6. | Start the engine, and turn on the headlights to high beam. |
| 7. | Measure the voltage between alternator 4P connector terminal No. 2 and the positive terminal of the battery.
Is there 1 V or less? YES - Go to 11. NO - Go to 8. |
| 8. | 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. |
| 9. | Disconnect ECM/PCM connector B (44P). |
| 10. | Check for continuity between ECM/PCM connector terminal B41 and body ground.
Is there continuity? YES - Repair a short in the wire between the alternator and the ECM/PCM.n NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n |
| 11. | 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. |
| 12. | Disconnect ECM/PCM connector B (44P). |
| 13. | Check for continuity between ECM/PCM connector terminal B41 and alternator 4P connector terminal No. 2.
Is there continuity? YES - Replace the alternator, or repair the alternator.n NO - Repair an open in the wire between the alternator and the ECM/PCM.n |