Car stalling

Tiny
BENPHARTEEN
  • MEMBER
  • 2007 HONDA ACCORD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Battery, starter and alternator good. Turn on headlights battery loses charge
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Tuesday, January 4th, 2011 AT 2:41 AM

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Tiny
KHLOW2008
  • EXPERT
The charging system is controlled by the PCM so if the alternator and battery is good, the PCM could be faulty.

ALTERNATOR CONTROL CIRCUIT TROUBLESHOOTING

1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC), and check for DTC's. If the DTC is present, diagnose and repair the cause before continuing with this test.

2. Disconnect the alternator 4P connector from the alternator.

3. Start the engine, and turn on the headlights to high beam.

4. 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 step 6.
NO - Go to step 8.

5. 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.

6. Disconnect engine control module ECM/PCM connector B (24P).

7. Check for continuity between ECM/PCM connector terminal B18 and body ground.

Is there continuity?
YES - Repair a short in the wire between the alternator and the ECM/PCM.
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.

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) for damage.

9. Disconnect ECM/PCM connector B (24P) and the alternator 4P connector.

10. Check for continuity between ECM/PCM connector terminal B18 and alternator 4P connector terminal No. 2.

Is there continuity?
YES - Replace the alternator or repair the alternator.
NO - Repair an open in the wire between the alternator and the ECM/PCM.
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Tuesday, January 4th, 2011 AT 4:56 PM

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