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<blockquote data-quote="FordTechOne" data-source="post: 1465922" data-attributes="member: 35543"><p>The Fuel Pump Relay (controlled by the PCM) supplies power to the Fuel Pump Driver Module (FPDM) through BJB Fuse F50 over circuit CBK01. The FPDM then provides power and ground to the fuel pump motor. The FPDM is controlled by the PCM over the FPC (Fuel Pump Control) circuit and receives feedback status from the FPDM over the FPM (Fuel Pump Monitor) circuit. If the PCM commands the Fuel Pump Relay closed (pre-start prime) and the FPDM doesn't send a feedback signal (no power), the PCM will set DTCs.</p><p></p><p>These vehicles do not use an inertia switch. When airbag deployment occurs, the Restraints Control Module (RCM) sends a signal over the Event Notification Signal (ENS) circuit to the BCM and PCM, which then initiate Fuel Pump Shutdown. The system uses a dedicated circuit instead of the CAN bus as a failsafe in the event that the bus goes down as the result of a collision.</p><p></p><p>The Brake Pedal Position (BPP) switch is a dual throw switch with the PCM monitoring one side and the BCM monitoring the other. So if there is a discrepancy between the two signals, DTCs will be set.</p></blockquote><p></p>
[QUOTE="FordTechOne, post: 1465922, member: 35543"] The Fuel Pump Relay (controlled by the PCM) supplies power to the Fuel Pump Driver Module (FPDM) through BJB Fuse F50 over circuit CBK01. The FPDM then provides power and ground to the fuel pump motor. The FPDM is controlled by the PCM over the FPC (Fuel Pump Control) circuit and receives feedback status from the FPDM over the FPM (Fuel Pump Monitor) circuit. If the PCM commands the Fuel Pump Relay closed (pre-start prime) and the FPDM doesn't send a feedback signal (no power), the PCM will set DTCs. These vehicles do not use an inertia switch. When airbag deployment occurs, the Restraints Control Module (RCM) sends a signal over the Event Notification Signal (ENS) circuit to the BCM and PCM, which then initiate Fuel Pump Shutdown. The system uses a dedicated circuit instead of the CAN bus as a failsafe in the event that the bus goes down as the result of a collision. The Brake Pedal Position (BPP) switch is a dual throw switch with the PCM monitoring one side and the BCM monitoring the other. So if there is a discrepancy between the two signals, DTCs will be set. [/QUOTE]
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