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Test C: System Overcharges

  1. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition on. Using NGS tester, perform Powertrain Control Module (PCM) self-test. If no DTCs are retrieved, go to next step. If any Diagnostic Trouble Codes (DTC) are retrieved, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  2. Turn ignition off. Reconnect generator 3-pin harness 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.
  3. Turn ignition off. Disconnect generator 3-pin harness connector. Turn ignition on. Measure voltage between ground and generator harness connector terminal No. 3 (Red wire). See Figure. If voltage is less than .5 volt from battery voltage, replace generator. See GENERATOR  under REMOVAL & INSTALLATION. If voltage is greater than .5 volt from battery voltage, repair high resistance in Red wire. See WIRING DIAGRAMS .
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