Alternator FR Signal Circuit Troubleshooting
WARNING: This page is about a different car, the 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Information marked with an asterisk (*1) applies to '09-10 models and '11-12 models (M/T).
- Information marked with an asterisk (*2) applies to '11-12 models (A/T).
- 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 body ground and ECM/PCM connector terminal B47.
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:
- Troubleshoot the alternator and regulator circuit (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING ).
- 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 ).