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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 244 (Generators & Regulators - F250-F550 Super Duty (Diesel With Dual Generators)) >> Diagnostic Tests >> DTC P1107: Lower Generator Circuit Fault Detected

DTC P1107: Lower Generator Circuit Fault Detected

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check Lower Generator "I" Circuit For Short To B+

    Turn ignition switch to LOCK position. Disconnect PCM connector C1381c. PCM is located at left rear of engine compartment. Disconnect lower generator 3-pin harness connector. Turn ignition switch to RUN position. Measure voltage between ground and PCM connector C1381c terminal No. 4 (Yellow wire). See Figure. Is the voltage greater than 0 volts? If yes, repair short to B+ in Yellow wire. Clear DTCs. Test system for normal operation. If no, go to next step.

  2. Check Lower Generator "I" Circuit

    Turn ignition switch to LOCK position. Connect PCM connector. Connect lower generator connector. Start engine. After starting engine, wait at least 2 minutes for glow plugs to stop cycling. Measure voltage between ground and lower generator connector terminal No. 1 (Yellow wire). See Figure. Is the voltage greater than 0 volts? If yes, go to step  4. If no, go to next step.

  3. Check PCM Operation

    Turn ignition switch to LOCK position. Connect PCM connector. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). 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 connector terminal No. 1 (Yellow wire). See Figure. Is the voltage greater than 0 volts with the glow plugs on? If yes, go to next step. If no, install a new lower generator. See GENERATOR (LOWER)  under REMOVAL & INSTALLATION. Clear DTCs. Test system for normal operation.

  4. Check For Correct PCM Operation

    Disconnect PCM connectors. Inspect PCM connector for corrosion and pushed out pins. Connect PCM harness connector, ensuring it is connected properly. Connect all disconnected connectors. Operate system. Is the concern still present? If yes, replace PCM. If no, system is operating properly at this time.
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