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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 repaired.
2V: Two valves per engine cylinder
3V: Three valves per engine cylinder
4V: Four valves per engine cylinder
ABS: Anti-Lock Brake System
A/C: Air Conditioning
A/CC: Air Conditioning Clutch
A/CCR: Air Conditioning Clutch Control Relay
ACCS: Air Conditioning Cycling Switch
ACDS: Air Conditioning Diagnostic Switch (refrigerant containment switch)
ACET: Air Conditioning Evaporator Temperature
ACP: Air Conditioning Head Pressure or A/C cycling switch input state
ACPSW: Air Conditioning Pressure Switch
ACPT: Air Conditioning Pressure Transducer (Switch)
A/D: Analog-to-Digital. Analog-to-Digital signal conversion.
AFCM: Alternative Fuel Control Module
AIR: Secondary Air Injection
AIRB: Secondary Air Injection Bypass
AIR EVAL: Air System Evaluated. Displays a YES or NO status indicating whether the AIR System has been evaluated for On-Board Diagnostic (OBD) purposes.
AIRM: Secondary Air Pump Monitor
APP: Accelerator Pedal Position
ARB: Air Resource Board
ASCII: American Standard Code 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.
AWD: All-Wheel Drive
BARO: Barometric Pressure
BJB: Battery Junction Box
BOB: Breakout Box. A test device which connects in series to the PCM and PCM harness.
BPA: Brake Pedal Applied
BPP: Brake Pedal Position
BPS: Brake Pedal Switch/Speed Control Deactivation
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.
CAC: Charge Air Cooler. 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.
CAN: Controller Area Network
CAT EVAL: Catalyst System Evaluated. This item indicates YES when the Catalyst Efficiency Monitor has successfully completed.
CCM: Comprehensive Component Monitor
CD A through J: Coil Driver 1 through 10
CGND: Case Ground. Provides a ground source for the PCM case.
CHT: Cylinder Head Temperature
CHTIL: Cylinder Head Temperature Indicator Lamp
CKP: Crankshaft Position
CKP+, CKP-: CKP+ is the CKP sensor signal circuit. CKP- is the signal return circuit.
CL: Closed Loop. An operating condition or mode which enables operation based on sensor feedback.
CMCV: Charge Motion Control Valve
CMP, CMP1, CMP2: Camshaft Position. CMP1 and CMP2 on V engines where applicable.
CMS: Catalyst Monitor Sensor. The downstream HO2S.
CMVSS: Canadian Motor Vehicle Safety Standards
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.
CONT: Continuous Memory. The portion of keep alive memory (KAM) used to store DTCs generated during the continuous memory self-test.
COP: Coil On Plug. Ignition coil on plug assembly.
CPP: Clutch Pedal Position
CT: Closed Throttle. A mode in which 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.
CV: Canister Vent Solenoid. A solenoid which seals the evaporative emission (EVAP) system from the atmosphere during the EVAP monitor test.
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. A communication path between various in-vehicle electronic modules.
DI: Distributor Ignition. A system in which the ignition coil secondary circuit is sequenced by a distributor.
DIS: Distributorless Ignition System. A system in which the ignition coil secondary circuit is sequenced without a distributor.
DLC: Data Link Connector. SAE standard J1962 connector providing access to vehicle diagnostic information.
DMM: Digital Multimeter
DOHC: Dual Overhead Cam. An engine configuration that uses 2 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. A system that uses a pressure transducer to control the operation of the exhaust gas recirculation (EGR) vacuum regulator valve.
DRI: Deposit Resistant Injector. A fuel injector designed to prevent the build-up of carbon and other unwanted deposits.
DTM: Diagnostic Test Mode. A level of capability in an OBD system.
DTC: Diagnostic Trouble Code. An alpha/numeric identifier for a concern identified by the OBD system.
E-85: Fuel containing 85% ethanol alcohol
ECT: Engine Coolant Temperature
ECU: Electronic Control Unit. A module that handles the control strategy and monitors system inputs or outputs.
EEC: Electronic Engine Control
EEGR: Electric Exhaust Gas Recirculation (EEGR) System
EEPROM: Electrically Erasable Programmable Read-Only Memory. An electronic component in the PCM that allows the electronic storage of information.
EGR: Exhaust Gas Recirculation. A process in which a small amount of exhaust gas is routed into the combustion chamber.
EGRMC (1-4): Electric Exhaust Gas Recirculation Motor Control
EGRT: Exhaust Gas Recirculation Valve Temperature. A temperature sensor that is threaded into the bottom of the intake plenum.
EGRVR: Exhaust Gas Recirculation Vacuum Regulator. A solenoid which controls vacuum to the EGR valve by varying the duty cycle signal from the PCM.
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.
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 conform to design specifications.
EONV: Engine Off Natural Vacuum
EOT: Engine Oil Temperature
EPA: Environmental Protection Agency (United States Government)
E-Quizzer: Enhanced Quizzer
ESM: EGR System Module
ESOF: Electronic Shift-on-the-Fly
ETB: Electronic Throttle Body
ETC: Electronic Throttle Control
ETCREF: Voltage Reference (5V) for ETC (APP VREF, TP VREF).
EVAP: Evaporative Emissions. A system to prevent fuel vapor from escaping into the atmosphere.
EVAPCP: Evaporative Canister Purge Solenoid. A solenoid which controls the venting of fuel vapor from the evaporative emissions canister into the intake manifold for combustion.
EVO: Electronic Variable Orifice
EVR: Electronic Vacuum Regulator Solenoid
EWP: Electric Water Pump
FCS: Fuel Control Solenoid
FCIL: Fuel Cap Indicator Lamp. Indicates that the fuel filler cap is not correctly installed.
FEAD: Front End Accessory Drive
FEPS: Flash EEPROM Programming Signal. An 18-volt DC signal input from the diagnostic tool used by the PCM to initiate programming.
FFV: Flexible Fuel Vehicle
FLI: Fuel Level Input. Provides information on the amount of liquid fuel in the fuel tank. Used by the EVAP monitor to calculate the fuel tank vapor volume. Displayed as a percentage.
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.
FRP: Fuel Rail Pressure
FRPT: Fuel Rail Pressure Temperature
FSS: Fan Speed Sensor
FSSW: Fuel Select Switch. An output signal between the PCM and the fuel injector interface module which determines the fuel delivery mode.
FTP: Fuel Tank Pressure
FUEL PR: Fuel Pressure. Measurement of the force of the fuel delivered by the fuel pump.
FUELPW: Fuel Pulse Width. Displays the commanded pulse width at the time of the last data update.
FUELPW1: Fuel Injector Pulse Width #1. Corresponds to injectors normally affected by HO2S11.
FUELPW2: Fuel Injector Pulse Width #2. Corresponds to injectors normally affected by HO2S21.
FUELSYS: Fuel System Status (OPEN/CLOSED Loop). Formerly known as LOOP.
FWD: Front Wheel Drive
GEN: Generator
GENLI: Generator Load Input. An input signal used by the PCM to monitor charging system operation and determine the system voltage.
GND: Ground
GPM: 1. Grams per Mile. 2. Gallons per Minute.
GVW: Gross Vehicle Weight
GVWR: Gross Vehicle Weight Rating
HC: 1. Hydrocarbon. A by-product of combustion and a component of auto exhaust emissions. 2. High Compression.
HFC: High Fan Control
HLOS: Hardware Limited Operating Strategy. A mode of operation where the PCM replaces output commands with fixed values in response to internal PCM concerns.
HO: High Output
HO2S: Heated Oxygen Sensor. Provides information on rich or lean exhaust conditions to the PCM.
HTR11, HTR12, HTR13, HTR21, HTR22: HO2S Heater. Heater element for the HO2S sensor.
Hz: Hertz. Cycles per second.
IAC: Idle Air Control. Electrical control of throttle bypass air.
IAT: Intake Air Temperature
IAT2: Intake Air Temperature 2. Used on supercharged vehicles.
IC: Integrated Circuit. A small semi-conductor device capable of many separate circuit functions.
ICM: Ignition Control Module. The module that controls the ignition system.
IFS: Inertia Fuel Switch
IMRC: Intake Manifold Runner Control. Controls or modifies airflow in the intake air system.
IMRCM: Intake Manifold Runner Control Monitor. Monitors the IMRC circuits for concerns.
IMTV, IMTV1, IMTV2: 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.
IPC: Independent Plausibility Checker
ISO: International Standards Organization