Before performing this test, ensure battery is fully charged. Connect voltmeter leads across battery terminals. Record voltage with ignition switch and all electrical loads off. Fully engage parking brake, and place gear selector in Park.
Start engine and operate at normal operating temperature. Record voltage with engine speed at 1500 RPM with no electrical loads. Voltage should not be greater than voltage recorded in step 1) by more than 2.5 volts. If voltage is not as specified,
Record voltage with engine speed at 2000 RPM, blower motor on high and headlights on high beam. Voltage should be more than 0.5 volt greater than battery voltage previously recorded in step 1). If voltage is less than 0.5 volt above previously recorded battery voltage,
If voltage tests are satisfactory, reduce engine speed, and turn off blower motor, headlights and ignition switch.
Connect an external voltmeter between generator B+ terminal and battery positive terminal. Start engine. If voltage is.4 volt or less, go to next step. If voltage is more than.4 volt, repair B+ circuit for high resistance between generator and battery.
Turn ignition off. Connect an external voltmeter between generator case and battery negative terminal. Start engine. If voltage is.1 volt or less, go to next step. If voltage is more than.1 volt, repair generator ground for high resistance between generator case and battery negative terminal.
Manually set engine speed to 1600 RPM. Using scan tool, read and compare target voltage and charging voltage. If difference between target voltage and charging voltage is one volt or less, go to next step. If difference between target voltage and charging voltage is more than one volt,
PCM regulate volts
Return engine to idle speed. Turn engine off. Using scan tool, erase DTCs.
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Thursday, October 1st, 2009 AT 6:38 PM
