Alternator FR Signal Circuit Troubleshooting
- Start the engine, and let it idle
- Monitor the ALTERNATOR in the DATA LIST with the HDS
- Check if the indicated percentage varies when the headlight switch is turned on
Does the percentage vary?
YES -The alternator signal circuit is OK
NO -Go to step 4
- Turn the headlight switch off and the ignition switch to LOCK (0)
- Jump the SCS line with the HDS
- Disconnect the alternator 4P connector
- Disconnect ECM/PCM connector B (49P)
- Check for continuity between ECM/PCM connector terminal B47 and body ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair short in the wire between the ECM/PCM (B47) and the alternator
NO -
- Do the alternator and regulator circuit troubleshooting (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING )
- Reconnect all connectors, then update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING 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 )