Honda Accord: Alternator and Regulator
Circuit Troubleshooting - Charging System - Engine Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: Alternator and Regulator Circuit Troubleshooting

Special Tools Required

Alternator, Regulator, Battery, and Starter Tester OTC3131* ^Available through the Honda Tool and Equipment Program 888-424-6857

1. Make sure the battery connections are good and the battery is sufficiently charged.

2. Connect the alternator, regulator, battery & starter tester (OTC3131) to the battery as shown.

NOTE: The probe is used for alternator testing.

3. Start the engine. Hold the engine speed at 3,000 rpm


3. Start the engine. Hold the engine speed at 3,000 rpm with no load (in N or P (A/T model) or neutral (M/T model)) until the radiator fan comes on, then let it idle.

4. Do the CHARGING SYSTEM TEST.

Does the display indicate voltage within 13.5-”15.1 V and amperage of 87.5 A or more? YES-Go to step 5.

NO-lf the voltage is less than 13.5 V, go to alternator control circuit troubleshooting (see page 4-28). If the voltage is over 15.1 V and amperage is less than 87.5 A, replace the alternator (see page 4-32) or repair the alternator (see page 4-34).

5. Check the diode condition on the display.

Does the display indicate GOOD? YES-The diode is OK. Troubleshooting is complete.ll NO-lf the display indicates BAD, replace the alternator (see page 4-32) or repair the alternator (see page 4-34), then retest.B NOTE If the display indicates N/A, the diode pattern could not be diagnosed. Repeat the test. If N/A appears repeatedly, replace the alternator.

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