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F.I.
Fuel Injection
F4WD
Full Time Four Wheel Drive
FAIL SAFE
or Fail Soft: any attempt by a computer to compensate for a fault or lost signal, usually by substituting fixed replacement valves.
FAN
Cooling Fan (Low or High Speed)
FAULT CODES
A series of two-digit numbers, stored in the vehicle's on-board computer, which represent the results of On-Board Diagnostics or Vehicle Diagnostics. The computer transmits this information, via the Diagnostic Connector, as a series of pulses read either on a SCAN Tool, or as flashes of the "Power Loss/Check Engine" light on the vehicle's instrument panel.
FBC
Feedback Carburetor
FBCA
Feedback Carburetor Actuator (Ford)
FC
Fan Control
FCA
Fuel Control Assembly (Chrysler)
FCS
Fuel Control Solenoid (Ford)
FCS (FEEDBACK CONTROL SOLENOID)
Controls the introduction of filtered fresh air into the idle and main system bleed passages of the carburetor.
FCS (FUEL CONTROL SOLENOID)
Device which controls the carburetor air/fuel ratio. The FCS can be either a pulsating duty-cycle solenoid which bleeds air into the main and idle fuel systems, or a combined duty-cycle solenoid and vacuum regulator which controls fuel flow in the main fuel system and bleeds air into the idle fuel system.
FDBK
Feedback
FDC
Fuel Deceleration Valve (Ford)
FDV
Fuel Decel Valve (Ford)
FEED CIRCUIT
The power supply or hot wire.
FEEDBACK CARBURETOR (FBC)
System of fuel control employing a computer controlled solenoid that varies the carburetors air/fuel mixture.
FEEDBACK CARBURETOR ACTUATOR
Computer controlled stepper motor used on Ford feedback carburetors, that varies air/fuel mixture.
FEEPROM
Flash Electronically Erasable Programmable Read Only Memory
FEPROM
Flash Erasable Programmable Read Only Memory
FERROMAGNETIC MATERIAL
Any material with high magnetic permeability and high residual magnetism.
FF
Flexible Fuel
FI
Fuel Injector
FIC
Fast Idle Control
FICD
Fast Idle Control Device
Filtered Tachometer Output
An output from Ford DIS TFI IV module which provides a filtered ignition signal to the processor in order to control dwell.
FIPL
Fuel Injection Pump Lever
FLC
Fluid Lock-up Converter (Ford)
FLS
Fluid Level Sensor (GM)
FLUX LINES
The lines of magnetic force (also referred to as Maxwells).
FM
Fan Motor Program in PCM
FMEM
Failure Mode Effects Management. Sometimes referred to limp-in mode.
FMVSS
Federal Motor Vehicle Safety Standards
FOM
Fix Operating Mode (Limp Mode)
FP
Fuel Pump Relay (Ford)
FP
Fuel Pump
FPM
Fuel Pump Monitor (in PCM)
FPRC
Fuel Pump Regulator Control
FRC
Forced
Freeze Frame
A digital representation of engine and/or emissions system conditions present when a fault code was recorded.
FREQUENCY
The number of cycles-per-second (complete alternations) of an alternating current.
FRP
Fuel Rail Pressure
FRT
Fuel Rail Temperature
FRZ
Freeze Frame
FT
Fuel Trim
FTL
Fuel Tank Level Sensor
FTO
Filtered Tachometer Output
FTP
Fuel Tank Pressure
FTT
Fuel Tank Temperature
FUEL FILTER
A device installed in the pressure line to prevent foreign particles from entering the remainder of the fuel system (particularly the injectors).
FUEL INJECTOR
An assembly which receives a metered charge of fuel from another source, and is actuated by an engine mechanism to inject the charge of fuel into the combustion chamber at the proper time.
FUEL PRESSURE (INLET) LINE
The pressurized line, usually constructed of rubber, metal or plastic, which carries the fuel supply from the fuel tank to the fuel pump and the fuel injectors.
FUEL PRESSURE REGULATOR
A device which maintains a controlled fuel pressure at the fuel injector or a controlled differential pressure across the fuel injector.
FUEL PUMP
A device (electrical or mechanical) which provides a specified fuel flow at the required system pressure.
FUEL PUMP INLET SCREEN FILTER
A screen-type filter mounted on the in-tank fuel pump which protects the pump inlet drawing excess dirt and foreign particles.
FUEL PUMP RELAY
Provides power to the electric fuel pump in TBI/EFI systems. The relay is either controlled by, or is an integral part of, the ASD relay.
FUEL RAIL
A fuel manifold line which carries and distributes the fuel to the individual injectors (used with Multi-port Fuel Injection systems).
FUEL RETURN LINE
The line which carries unused fuel from the fuel rail or throttle body back to the fuel tank.
FUEL RICH, LEAN
An evaluation of the air/fuel ratio based on the input received from the oxygen sensor. An air/fuel mixture with an excessive amount of oxygen is referred to as "lean"; an air/fuel mixture with an insufficient amount of oxygen is referred to as "rich".
FUEL SYSTEM INERTIA SWITCH
A device used in most Ford vehicles which acts as a circuit breaker for the fuel system's electrical components (refer to your vehicle's service manual for location).
FUEL SYSTEM TEST PORT
A test port or opening incororated in the fuel rail or throttle body specifically designed to provide easy access to test and clean the fuel system.
FUEL TANK
A holding apparatus, usually constructed of metal or plastic, which stores the vehicle's fuel supply.
FUEL-VACUUM SEPARATOR
A filtering device which protects the vacuum delay and distributor vacuum controls by removing hydrocarbons from carburetor-ported vacuum.
FUSE
A mechanical device which contains a soft piece of metal which opens (melts) and breaks the circuit during high current (overload) conditions.
FUSIBLE LINK
A device which protects a circuit from damage if a short to ground occurs, or if the polarity of the battery (or charger) is reversed.
FWD
Front Wheel Drive
