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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 255 (Generators & Regulators -- F250-F550 Super Duty (Diesel With Dual Generators)) >> System Tests >> Test F: Warning Indicator Flickers Or Is Intermittent

Test F: Warning Indicator Flickers Or Is Intermittent

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check The Fault Codes In The PCM

    Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Using NGS tester, perform Powertrain Control Module (PCM) self-test. If no DTCs exist, go to next step. If any DTCs exist, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM.

  2. Check The Battery Voltage

    Start engine at let idle. Turn all accessories off. Measure voltage between primary battery terminals while varying engine speed. If voltage is less than 15.5 volts, go to next step. If voltage is 15.5 volts or more, perform TEST G: SYSTEM OVERCHARGES (BATTERY VOLTAGE GREATER THAN 15 VOLTS) .

  3. Check The Charging System Indicator Operation

    Turn ignition switch to LOCK position. Turn ignition switch to RUN position. Using the NGS tester, enter the ACTIVE COMMANDS diagnostic mode. Active Command the charging system warning indicator to the ON position. If the charging system warning indicator illuminates, go to next step. If the charging system indicator does not illuminate, see appropriate ANALOG INSTRUMENT PANELS article

  4. Check The PCM Operation

    Turn ignition switch to LOCK position. Disconnect NGS tester. Turn ignition switch to RUN position. Monitor charging system warning indicator. If the light is illuminated, PCM is operating correctly. Recheck generator circuits for intermittent shorts or opens. Test system for normal operation. If the light is not illuminated, go to next step.

  5. Check For Correct PCM Operation

    Disconnect PCM connector. Inspect PCM harness connector for corrosion and pushed out pins. Connect PCM harness connector, ensuring it is connected properly. Connect all disconnected connectors. Operate system. If fault is still present, replace PCM. If fault is not present, system is operating properly at this time.
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