Honda 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 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.