| 1. | Start the engine, and let it idle. |
| 2. | Monitor the ALTERNATOR in the DATA LIST with the Honda PGM Tester or the HDS. |
| 3. | Check if the indicated percentage is varied when the lighting switch is ON. Is the percentage varied? YES - The alternator signal circuit is OK.n NO - Go to 4. |
| 4. | Turn the lighting witch and ignition switch OFF. |
| 5. | Disconnect the alternator 4P connector. |
| 6. | Turn the ignition switch ON (II). |
| 7. | Measure voltage between ECM/PCM connector terminals A9 and B13. Is there about 5 V? YES - Go to 8. NO - Go to 14. |
| 8. | Turn the ignition switch ON. |
| 9. | Jump the SCS line with the Honda PGM Tester or the HDS. |
| 10. | Disconnect ECM/PCM connector B (24P). |
| 11. | Diconnect the alternator 4P connector. |
| 12. | Connect alternator 4P connector terminal No. 4 to body ground with a jumper wire. |
| 13. | Check for continuity between body ground and ECM/PCM connector terminal B13. Is there continuity? YES - Test the alternator.n NO - Repair open in the wire between the ECM/PCM (B13) and the alternator.n |
| 14. | Turn the ignition switch OFF. |
| 15. | Jump the SCS line with the Honda PGM Tester or the HDS. |
| 16. | Disconnect ECM/PCM connector B (24P). |
| 17. | Chcek for continuity between body ground and ECM/PCM connector terminal B13. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B13) and the alternator.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 |