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DTC P1107: Lower Generator Circuit Fault Detected

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to LOCK position. Disconnect lower generator 3-pin harness connector. Turn ignition switch to RUN position. Measure voltage between ground and lower generator harness connector terminal "I" (Yellow wire). See Figure. If voltage is present, replace lower generator. See LOWER GENERATOR  under REMOVAL & INSTALLATION. If no voltage is present, go to next step.
  2. Turn ignition switch to LOCK position. Disconnect Powertrain Control Module (PCM) 104-pin harness connector. Turn ignition switch to RUN position. Measure voltage between ground and PCM harness connector terminal No. 60. See Figure. If no voltage is present, go to next step. If voltage is present, repair short to voltage in Yellow wire between lower generator and PCM. See WIRING DIAGRAMS .
  3. Turn ignition switch to LOCK position. Connect PCM harness connector. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Turn ignition switch to RUN position. Using NGS tester, perform glow plug test. While test is in progress, measure voltage between ground and lower generator harness connector terminal "I" (Yellow wire). See Figure. If voltage is present, go to next step. If voltage is not present, system is operating properly at this time. Clear DTC and check circuit for intermittent short to voltage. See WIRING DIAGRAMS .
  4. Disconnect PCM harness 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. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If fault is not present, system is operating properly at this time.
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