Operation CHARM: Car repair manuals for everyone.
Home >> Honda >> 2012 >> Pilot 4WD V6-3.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Alternator FR Signal Circuit Troubleshooting
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Alternator FR Signal Circuit Troubleshooting




Alternator FR Signal Circuit Troubleshooting

1. Start the engine, and let it idle.

2. Monitor the ALTERNATOR in the DATA LIST with the HDS.

3. Check for 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.

4. Turn the headlight switch OFF and the ignition switch to LOCK (0).

5. Jump the SCS line with the HDS.

6. Disconnect the alternator 4P connector.

7. Disconnect PCM connector C (49P).

8. Check for continuity between body ground and PCM connector terminal C44.





Is there continuity?

YES -

Repair a short in the wire between the PCM (C44) and the alternator.

NO -

Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM PCM Replacement (Except FFV Model).

pro multis · About Operation CHARM