The car's computer will disable the fuel pump, the ignition coil and/or the injectors, depending on the electronic immobilizer system. The engine may turn on for a few seconds and then it will stop.If the car does not recognize the signal of the key, two things may happen: For additional IFS information, see INERTIA FUEL SHUTOFF SWITCH (ALL FUEL SYSTEMS) .įig.What happens when the immobilizer is activated on a F-150? IFS switch is a safety device that should only be reset after a thorough inspection of the vehicle (following a collision). The reservoir prevents fuel flow interruptions during extreme vehicle maneuvers with low tank fill levels.ġ1. The Inertia Fuel Shutoff (IFS) switch is used to de-energize fuel delivery secondary circuit in the event ofĪ collision. Fuel pump is located inside reservoir and supplies fuel through fuel pump module manifold to engine and fuel pump module jet pump. Has a discharge check valve to maintain system pressure during shutdowns and to minimize starting problems. There is a fuel filter screen located at fuel rail side of fuel injector, and the fuel filter assembly is located between fuel pump and pressure test point/Schrader valve.ġ0. The Fuel Pump (FP) module is a device that contains fuel pump and fuel sender assembly. Screen mounted on intake side of fuel pump.
On vehicles not equipped with a Schrader valve, use Rotunda Fuel Pressure Test Kit (134-R0087) or equivalent.ĩ. There are 3 filtering or screening devices in fuel delivery system. Supply pressure for service and diagnostic procedures. For additional fuel injector information, see FUEL INJECTORS under FUEL CONTROL.Ĩ. A pressure test point valve (Schrader valve) is located on fuel rail. Fuel injector is normally closed and is operated by a 12-volt VPWR signal from power relay. Amount of fuel is controlled by length of time fuel injector is held open. Opened and closed a constant number of times per crankshaft revolution. Information is used to vary fuel pressure and avoid fuel system vaporization.ħ. The fuel injector is a solenoid-operated valve that meters fuel flow to each cylinder. Information to vary duty cycle output to FPDM to compensate for varying loads.Ħ. The Engine Fuel Temperature (EFT) sensor measures current fuel temperatures in fuel rail. For additional FPDM information, see FUEL PUMP DRIVER MODULE under COMPUTERIZED ENGINE CONTROLS.ĥ. The Fuel Rail Pressure (FRP) sensor provides PCM with current fuel rail pressure. Is supplied by power relay or FPDM power supply relay. 4. The FPDM modulates voltage to Fuel Pump (FP) to achieve proper fuel pressure.
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