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Test B: System Overcharges

  1. Connect NGS tester. Turn ignition on and perform PCM self-test. If any Diagnostic Trouble Code (DTC)s are retrieved, see POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX  table. If no DTCs are retrieved, go to next step.
  2. Turn ignition off. Disconnect NGS tester. Start engine. With engine running and all accessories turned off, measure voltage between battery terminals while varying engine speed. If voltage is greater than 15 volts, go to step  4 . If voltage is less than 15 volts, go to next step.
  3. Turn ignition off. Disconnect generator 3-pin connector. Start engine. Check generator output. See GENERATOR LOAD TEST  under ON-VEHICLE TESTING. If generator tests okay, go to next step. If generator does not test okay, replace generator. See GENERATOR  under REMOVAL & INSTALLATION.
  4. Measure voltage of Red wire at generator 3-pin connector. If voltage is less than .5 volt from battery voltage, replace generator. See GENERATOR  under REMOVAL & INSTALLATION. Clear DTCs and retest system operation. If voltage is greater than .5 volt from battery voltage, repair high resistance in Red wire. See WIRING DIAGRAMS  . Clear DTCs and retest system operation.
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