2V - L
ACRONYMS AND DEFINITIONSNOTE: This Acronyms and Definitions listing contains technical terms applicable to Ford Motor Company products. It is not intended to be an all-inclusive dictionary of components and their functions. If a detailed description of a particular system or component is desired, refer to the applicable Vehicle System for the specific vehicle being serviced.
2V - Two Valves per engine cylinder.
4V - Four Valves per engine cylinder.
ABS - Anti-lock Brake System.
A/C - Air Conditioning. A vehicle accessory system that modifies the passenger compartment air by cooling and dehydrating the air.
ACC - Air Conditioning Clutch. Indicates status of the A/C clutch.
ACCS - Air Conditioning Cycling Switch. Indicates status of the A/C cycling switch.
ACD - Air Conditioning Demand. A signal input to the PCM from the Air Conditioning control panel.
ACET - Air Conditioning Evaporator Temperature (may also be referred to as Evaporator Air Discharge Temperature).
ACP - Air Conditioning Head Pressure or A/C cycling switch input state.
ACPSW - Air Conditioning Pressure Switch.
ACP V - Air Conditioning Head Pressure Volts. A voltage input to the PCM from the ACP switch or sensor.
ACR - Air Conditioning Relay. Commanded output controlled by the PCM and acts as an A/C cutout control during heavy acceleration.
A/D - Analog-to-Digital. Analog-to-Digital signal conversion.
ADC - See ATDC.
AFCM - Alternative Fuel Control Module.
AIR - Secondary Air Injection.
AIRB - Secondary Air Injection Bypass.
Air Diverter - Air Diverter Valve. Part of the EAIR system. Diverts fresh air to the exhaust system when the electric air pump is commanded on.
AIR EVAL - Air System Evaluated. Displays a YES or NO status indicating whether the Air System has been evaluated for OBD (On-Board Diagnostic) II purposes.
Air/Fuel Ratio - Air to fuel mixture ratio. An air/fuel mixture that is 14.7:1 is also called stoichiometry.
AIRM - Secondary AIR pump monitor.
Ambient Air Temperature - Temperature of the air surrounding an object.
Analog (Electrical/Electronic) - An electrical signal that can obtain any value within the voltage limits of the signal.
ARB - Air Resource Board.
ARPMIDES - Ancillary RPM Desired. RPM required to maintain the vehicle speed commanded by Speed Control Command Switch (SCCS) inputs.
ASCII - American Standard Code for Information Interchange.
ATDC - After Top Dead Center. The location of the piston after it has reached the top of its stroke. Measured in degrees of crankshaft rotation.
AVOM - Analog Volt-Ohm Multimeter. Readings are indicated by a sweep hand on a printed scale, rather than a digital display.
AWD - All-Wheel Drive.
BARO - Barometric Pressure.
Base Idle - Idle rpm determined by the throttle lever hardset on the throttle body with the IAC solenoid disconnected.
Base Timing - Spark advance in degrees before top dead center of the base engine without any control from the PCM or ICM.
Battery Positive Voltage (B+) - The positive (+) voltage from the battery or any circuit connected directly to the battery. Compare "Vehicle Power (VPWR)."
BATTEMP - Battery Temperature.
BJB - Battery Junction Box.
BOB - Breakout Box. A test device which connects in series to the PCM and PCM harness.
BPA - Brake Pedal Applied switch. Typically located on the braking system master cylinder. Can be hydraulic or electric.
BPP - Brake Pedal Position. Indicates the position of the brake pedal, based on input from the Brake Pedal Position (BPP) switch.
BRAKE LMP or BRKL - Brake Warning Lamp Status. Activates the Brake Warning Lamp by applying voltage to the control line.
BTDC - Before Top Dead Center. The location of the piston before it has reached the top of its stroke. Measured in degrees of crankshaft rotation.
Bus+ or Bus- - Multiplex circuits that carry SCP data from module to module and to the DLC.
CAC - Charge Air Cooler. Formerly known as Intercooler. A device which lowers the temperature of pressurized intake air.
CAFE - Corporate Average Fuel Economy. A set of federal requirements and regulations which govern fuel economy standards.
CANVNT - Canister Vent Solenoid.
Catalyst - Catalytic converter. An in-line exhaust system device used to reduce the level of engine exhaust emissions.
CAT EVAL - Catalyst System Evaluated. This item indicates YES when the Catalyst Efficiency Monitor has successfully completed.
CCM - Comprehensive Component Monitor.
CCRM - Constant Control Relay Module. A relay module that provides ON-OFF control of various EEC components.
CD A through j - Coil Driver 1 through 10.
Centralized Testing Facility - State government operation. Provides Inspection/Maintenance (IM) and safety inspections.
CGND or CSE GND - Case Ground. Provides a ground source for the PCM or ECU case.
CHT - Cylinder Head Temperature. Units are displayed in either degrees Fahrenheit or Centigrade.
CHTIL - Cylinder Head Temperature Indicator Lamp.
CHTV - Cylinder Head Temperature Voltage. The actual voltage drop across the CHT sensor thermistor.
CID - Cylinder Identification. PCM input signal from Camshaft Position Sensor.
CKP - Crankshaft Position. Senses the position of the crankshaft.
CKP+, CKP- - CKP+ is the Crankshaft Position (CKP) sensor signal wire. CKP- is the signal return.
CL - Closed Loop. An operating condition or mode which enables operation based on sensor feedback.
CMP - Camshaft Position. Indicates camshaft position.
CMPFM - Camshaft Position Failure Mode. Indicates when the PCM identifies a CID/CMP fault.
CMS - Catalyst Monitor Sensor. Downstream HO2S.
CMVSS - Canadian Motor Vehicle Safety Standards.
CNG - Compressed Natural Gas.
CO - Carbon Monoxide. A colorless, odorless and toxic gas that is a component of auto exhaust emissions.
CO2 - Carbon Dioxide. A colorless, odorless gas that is a normal by-product of the combustion of fuel.
Coil - A device consisting of windings around an iron core. In a spark ignition system, designed to increase voltage.
Cold Soak - Time given to a vehicle to sit at a low temperature (typically below 68°F / 20°C) until the temperature of external and internal components stabilize.
CONT - Continuous Memory. The portion of KAM (keep alive memory) used to store DTCs generated during Continuous Memory Self-Test.
Continuous Memory Self-Test - A continuous test of the EEC system conducted by the PCM whenever the vehicle is operating.
CPP - Clutch Pedal Position. Indicates clutch pedal position.
CPP Switch - Clutch Pedal Position Switch. Located on the clutch pedal and detects when the clutch pedal is depressed.
COIS - Common Quality Indicator System.
CSE GND - Case Ground.
CT - Closed Throttle Mode. A mode when the PCM varies the pulse width of the fuel injectors to obtain the air/fuel mixture appropriate for closed throttle operation.
CTO - Clean Tach Output. Signal used to drive the instrument panel tachometer.
Data Communications Link - A communication path between various in-vehicle electronic modules. Accessed by scan tools through the Data Link Connector (DLC).
DC - 1. Direct Current. Electric current flowing in one direction. 2. Duty Cycle. The voltage measurement of ON time versus the full cycle period, expressed in percent.
DCL - Data Communication Link.
DI - Distributor Ignition. A system in which the ignition coil secondary circuit is sequenced by a distributor.
Digital - Controls process information by switching the current or voltage ON and OFF.
DLC - Data Link Connector. J1962 connector providing access to vehicle diagnostic information.
DOHC - Dual Overhead Cam. An engine configuration that uses two camshafts positioned above the valves.
DOL - Data Output Line. A circuit that sends certain information from the PCM to the instrument cluster.
DPFEGR - Differential Pressure Feedback Exhaust Gas Recirculation. System that uses a pressure transducer to control the operation of the EGR Vacuum Regulator Valve.
DRI - Deposit Resistant Injector. A fuel injector designed to prevent build-up of carbon and other unwanted deposits.
DRL - Daytime Running Lamps. A system that keeps the vehicle running lamps on at all times while the vehicle is operating.
DTM - Diagnostic Test Mode. A level of capability in an On-Board Diagnostic (OBD) system.
DTC - Diagnostic Trouble Code. An alpha/numeric identifier for a fault condition identified by the On-Board Diagnostic System.
DVOM - Digital Volt-Ohm Meter.
E-85 - Fuel containing 85% ethanol alcohol.
EAIR - Electric Secondary Air Injection. A pump-driven system for providing secondary air using an electric air pump.
EAIRM - Electric Secondary Air Pump circuit Monitor.
ECT - Engine Coolant Temperature. Displayed in either Fahrenheit or Centigrade.
ECTV - Engine Coolant Temperature Voltage. The actual voltage drop across the ECT sensor thermistor.
ECU - Electronic Control Unit. A module that handles the control strategy and monitors system inputs or outputs.
EEC - Electronic Engine Control system.
EEC-V - Fifth generation EEC system.
EFT - Engine Fuel Temperature.
EFTA - Bank 1 input. EFTA is displayed in either Fahrenheit or Centigrade.
EFTAV - Voltage drop across the EFTA (Bank 1) sensor thermistor.
EFTB - Bank 2 input. EFTB is displayed in either Fahrenheit or Centigrade.
EFTBV - Voltage drop across the EFTB (Bank 2) sensor thermistor.
EGR - Exhaust Gas Recirculation. A process in which a small amount of exhaust gas is routed into the combustion chamber.
EGR EVAL - Exhaust Gas Recirculation System Evaluated. EGR EVAL will display YES when the monitor is complete.
EGRMDSD - Electric Exhaust Gas Recirculation Motor Desired position. The PID name used to operate the EEGR valve with scan tool's output state control.
EGRS - EGR Shutoff. A normally closed solenoid that applies vacuum to the EGR valve when energized by the PCM.
EGRT - Exhaust Gas Recirculation Valve Temperature Sensor. A temperature sensor that is threaded into the bottom of the intake plenum.
EGR Vacuum Regulator - Controls vacuum to the EGR valve by a duty cycle signal from the PCM.
EGRVR - Exhaust Gas Recirculation Vacuum Regulator. Solenoid which varies the vacuum to the EGR valve by varying the duty cycle to the regulator.
EGRVRA - Exhaust Gas Recirculation Vacuum Regulator Actual (volt). The actual state of the commanded output.
EGRVRF - Exhaust Gas Recirculation Vacuum Regulator Fault. Represents whether a fault exists in the EGRV circuit.
EI - Integrated Electronic Ignition. An Electronic Ignition system that has the Ignition Control Module (ICM) integrated into the PCM.
EI-HDR - Electronic Ignition, High Data Rate. Formerly known as Electronic Distributorless Ignition System.
EI-LDR - Electronic Ignition, Low Data Rate. Formerly known as Distributorless Ignition System.
EMI - Electromagnetic Interference. Usually caused by ignition voltage spikes, solenoids, relay operation or noisy generator contacts.
EOL - End Of Line. A system designed specifically for use at assembly plants to make sure all new vehicles perform to design specifications.
EPA - Environmental Protection Agency (U.S. Government).
EPROM - Erasable Programmable Read-Only Memory. An electronic component in the PCM that requires the electronic storage of information.
ESM - EGR System Module.
ESOF - Electronic Shift-on-the-Fly.
EVAP - Evaporative Emissions. A system to prevent fuel vapor from escaping into the atmosphere.
EVAPCP - Evaporative Canister Purge Solenoid. Controls a solenoid which allows venting of the evaporative purge canister.
EVAPCPF - Evaporative Canister Purge Solenoid Fault. Identifies whether an electrical fault exists for the current commanded state.
EVAPCV - Evaporative Canister Vent Solenoid. Controls a solenoid which seals the EVAP system canister from atmospheric pressure during the EVAP OBD II Monitor test.
Evaporative Emissions Canister - An evaporative emission canister, containing activated charcoal which absorbs and holds fuel vapors.
EVAPPDC - Evaporative Canister Purge Duty Cycle. The duty cycle commanded to the Evap Canister Purge Solenoid by the PCM.
EVO - Electronic Variable Orifice.
EWP - Electric Water Pump.
Exciter Ring - A toothed or notched iron or steel disk, which is the moveable part of a wheel speed sensor.
FAN - Fan Speed. Used in conjunction with vehicles having multiple fan speed control. Displays OFF, LOW, or HIGH status.
FANSS - Fan Speed Sensor.
FC - Fan Control.
FCS - Fuel Control Solenoid.
FCIL - Fuel Cap Off Indicator Lamp. Indicates that the fuel filler cap was not properly installed.
FCV - Fan Control - Variable.
FEAD - Front End Accessory Drive.
FEPS - Flash EEPROM Programming Signal. 18 volt DC signal sent by the scan tool to initiate PCM reprogramming.
FFV - Flexible Fuel Vehicle.
FIFO - First In First Out.
FILO - First In Last Out.
FIM - Fuel Indicator Module.
FLI - Fuel Level Input. Used by the Evap monitor to calculate fuel tank vapor volume. Displayed as a percentage.
FLI V - Fuel Level Input Voltage.
FMEM - Failure Mode Effects Management. Operating strategy that maintains limited vehicle function in the event of a PCM or EEC component failure.
FP - 1. Fuel Pump. Indicates whether the pump has been commanded ON or OFF by the PCM. 2. Fuel Pump (Modulated). Fuel pump duty cycle percentage.
FPDM - Fuel Pump Driver Module. A module that controls the electric fuel pump.
FPF - Fuel Pump Fault. Identifies whether a fault exists in the FP circuit.
FPM - Fuel Pump Monitor. Monitors the Fuel Pump / circuits for faults.
Freeze Frame - A block of memory containing the vehicle operating conditions at a specific time.
FRP - Fuel Rail Pressure. Based on FRP V.
FRP V - Fuel Rail Pressure Voltage. A voltage input to the PCM from the Fuel Rail Pressure Sensor.
FSC - Fail-Safe Cooling.
FSV - Fuel Shut-Off Valve. A component of Natural Gas Vehicles. This valve either allows or prevents Natural Gas flow to the fuel rail.
FSVF - Fuel Shut-Off Valve Fault. Indicates if there is a fault in the FSV circuit. Displayed as YES or NO.
FSVM - Fuel Shut-Off Valve Monitor. Monitors operation of the Fuel Shut-Off Valve / circuit.
FTP - Fuel Tank Pressure. Displayed as inches of water, kPa, or volts.
FTP V - Fuel Tank Pressure Voltage. From the FTP transducer.
FUEL PR - Fuel Pressure. Measurement of the force of the fuel delivered via the fuel pump.
FUELPW - Fuel Pulse Width. Displays the commanded pulse width at time of last data update.
FUELPW1 - Fuel Injector Pulse Width #1. Corresponds to injectors normally affected by O2S1 (HEGO1).
FUELPW2 - Fuel Injector Pulse Width #2. Corresponds to injectors normally affected by O2S2 (HEGO2).
FUELSYS - Fuel System Status (OPEN/CLOSED Loop). Formerly known as LOOP.
Fuel Tank Vapor Valve - A valve mounted in the top of the fuel tank that vents excess vapor and pressure from the fuel tank into the Evaporative Emission Control System.
FWD - Front Wheel Drive.
GEM - Generic Electronic Module.
GEN - Generator.
GENF - Generator output fault.
GENFDC - Generator field control output.
GFS - Generator field signal monitor.
GND - Ground.
GPM - Grams Per Mile. Also known as Gallons Per Minute.
GPS - Global Positioning Satellite.
Green State Vehicle - Formally known as California Emissions. A vehicle that is equipped with California onboard diagnostics.
GSS - Gear Select Solenoid.
GVW - Gross Vehicle Weight.
Hall Effect - A process where current is passed through a small slice of semi-conductor material and a magnetic field to produce a small voltage in the semi-conductor.
Hard Fault - A fault currently present in the system.
HC - 1. Hydrocarbon. A by-product of combustion and a component of auto exhaust emissions. 2. High Compression.
HFC - High Fan Control.
HFCF - High Fan Control Fault. Identifies if there is a fault in the HFC circuit.
HFP - High Fuel Pump.
HLOS - Hardware Limited Operating Strategy. A mode of operation where the PCM replaces output commands with fixed values in response to internal PCM malfunctions.
HO - High Output.
HO2S - Heated Oxygen Sensor. Formerly known as Heated Exhaust Gas Oxygen (HEGO) Sensor. Provides information on rich or lean exhaust conditions to the PCM.
Hot Soak - Period of time after an engine operates where localized combustion heat dissipates throughout the engine.
HTR, HTR11, HTR12, HTR21, HTR22, HTRX1, HTRX2 - HO2S Heater. Heater element for the HO2S sensor.
Hydrogen - Chemical symbol H. Highly flammable gas.
Hz - Hertz. Cycles per second.
IAC - Idle Air Control. Electrical control of throttle bypass air.
IAT - Intake Air Temperature.
IATV - Intake Air Temperature Voltage. Actual voltage drop across the IAT sensor.
IAT2 - Intake Air Temperature 2. Displayed in either Fahrenheit or Centigrade. Used on supercharged vehicles.
IAT2V - Intake Air Temperature 2 Voltage. Actual voltage drop across the IATV2 sensor.
IC - Integrated Circuit. A small semi-conductor device capable of doing many separate circuit functions.
ICM - Ignition Control Module. The module that controls the ignition system.
IFDM - Integrated Fuel Delivery Module.
IFS - Inertia Fuel Shutoff.
IGN GND - Ignition Ground.
Ignition - System used to provide high voltage spark for internal combustion engines.
IGNKEY (IGKY) - Ignition Key status.
IGNSW (IGSW) - Ignition Switch Position.
IMRC - Intake Manifold Runner Control. Controls airflow through the high-speed runners in the intake manifold.
IMRCM - Intake Manifold Runner Control Monitor. Monitors the IMRC / circuits for faults.
IMTV - Intake Manifold Tuning Valve. Controls airflow through runners in a split intake manifold.
INJ1, INJ2, INJ3, INJ4, INJ5, INJ6, INJ7, INJ8, INJ9, INJ10 - Injector number or its signal output from the PCM.
Injector - A device for delivering metered pressurized fuel to the intake system or the cylinders.
Intake Air - Air drawn through a filter and distributed to each cylinder for use in combustion.
Intercooler - See CAC.
IPATS - Integrated Passive Anti-Theft System.
ISO - International Standards Organization.
KAM - Keep Alive Memory. A portion of the memory within the PCM that must have power even when the vehicle is not operating.
KAPWR - Keep Alive Power. Dedicated, unswitched power circuit that maintains KAM.
Key On Engine Off Self-Test - A test of the EEC system conducted by the PCM with power applied and the engine at rest.
Key On Engine Running Self-Test - A test of the EEC system conducted by the PCM with the engine running and the vehicle at rest.
KEYPWR - Key Power. Battery voltage supplied when the ignition key is in the ON position.
Knock - The sharp metallic sound produced when two combustion pressure fronts collide in the combustion chamber of an engine.
KOEC - Key On Engine Continuous.
KOEO - Key On Engine Off.
KOER - Key On Engine Running.
KPA - Kilopascal. Unit of pressure. 3.386 kPa = 1 inch of mercury (Hg.).
KPH - Kilometers Per Hour.
KS - Knock Sensor. Detects engine knock.
L - Liters. The unit of volume in the metric measuring system. One liter equals 1.08 quarts.
LEV - Low Emissions Vehicle.
LFC - Low Fan Control.
LFP - Low Fuel Pump. Reduced operating speed for multi-speed fuel pumps.
LIFO - Last In First Out.
LILO - Last In Last Out.
LONG FT1, LONGFT2 - Long-Term Fuel Trim. Fuel flow adjustment determined by the PCM.
LOOP - Indicates OPEN or CLOSED loop status.
LPG - Liquefied Petroleum Gas.
LPLR - Low Pressure Low Resistance fuel injector.