Alternator and Regulator Circuit Troubleshooting

Alternator and Regulator Circuit Troubleshooting

Special Tools Required

- Alternator, Regulator, Battery, and Starter Tester OTC3131
*: Available through the Acura 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, and 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 neutral (M/T model) or P or N (A/T model)) until the radiator fan comes on, then let it idle.

4. Do the CHARGING SYSTEM TEST.

Does the display indicate the voltage is within 13.5-15.1 V and the amperage is 87.5 A or more?

YES -

Go to step 5.

NO -

If the voltage is less than 13.5 V, go to alternator control circuit troubleshooting Alternator Control Circuit Troubleshooting. If the voltage is over 15.1 V and amperage is less than 87.5 A,replace the alternator Removal and Replacement or repair the alternator Overhaul.�

5. Check the diode condition on the display.

Does the display indicate GOOD?

YES -

The diode is OK. Troubleshooting is complete.�

NO -

If the display indicates BAD, replace the alternator Removal and Replacement or repair the alternator Overhaul, then retest.�

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 Removal and Replacement.