Part 1 of 2
ACRONYMS AND DEFINITIONS
NOTE: 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.
4V: Four valves per engine cylinder
ABS: Anti-Lock Brake System
ABS_STAT: ABS system status TCM received PID
A/C: Air Conditioning
A/CC: Air Conditioning Clutch
A/CCR: A/C Clutch Control Relay
A/CLPCS: A/C Low Pressure Cycling Switch
ACCS: Air Conditioning Cycling Switch
ACD: Air Conditioning Demand. A signal input to the PCM from the air conditioning control panel.
ACDS: Air Conditioning Diagnostic Switch (refrigerant containment switch)
ACET: Air Conditioning Evaporator Temperature (may also be referred to as Evaporator Air Discharge Temperature)
ACFDS_B: Air Conditioning Full Demand Switch (for traction battery compartment)
ACFDS_P: Air Conditioning Full Demand Switch (for passenger compartment)
ACP: Air Conditioning Head Pressure or A/C cycling switch input state
ACPSW: Air Conditioning Pressure Switch
ACPT: Air Conditioning Pressure Transducer (switch)
ACP V: Air Conditioning Pressure Volts. A voltage input to the PCM from the ACP switch or sensor.
ACRDV: A/C Refrigerant Distribution Valve Output
ACRDV_F: A/C Refrigerant Distribution Valve Output Fault
A/D: Analog-to-Digital. Analog-to-Digital signal conversion.
ADC: See ATDC.
Air/Fuel Ratio: Air-to-fuel mixture ratio. An air-to-fuel mixture that is 14.7:1 is also called stoichiometry.
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.
APP, APP1, APP2, APP3: Accelerator Pedal Position 1, 2, 3
APPS, APPS1, APPS2, APPS3: Accelerator Pedal Position Sensor 1, 2, 3
ARB: Air Resource Board
ARPMDES: Desired engine speed TCM received PID
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
Base Timing: Spark advance in degrees before top dead center of the base engine without any control from the PCM.
Battery Positive Voltage (B+): The positive (+) voltage from the battery or any circuit connected directly to the battery.
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. Typically located on the braking system master cylinder. Can be hydraulic or electric.
BPO: Battery Power Off
BPO_Hz: Battery Power Off Frequency PID
BPP: Brake Pedal Position
BPS: Brake Pedal Switch/Speed Control Deactivation
BRAKE_LMP or BRKL: Brake Warning Lamp Status. Activates the brake warning lamp by applying voltage to the control line.
BSI: Brake Shift Interlock
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 controller area network (CAN) data from module to module and to the data link connector (DLC).
BVREF: Buffer Voltage Reference. A dedicated circuit that provides approximately a 5 volt signal used as a reference by certain sensors.
CAFE: Corporate Average Fuel Economy. A set of federal requirements and regulations which govern fuel economy standards.
CANVNT: Canister Vent
CAN: Controller Area Network
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
CCNT: Number of Stored and Pending DTCs
CD A through D: Coil Driver 1 through 4
Centralized Testing Facility: State government operation. Provides inspection/maintenance (IM) and safety inspections.
CGND: Case Ground. Provides a ground source for the PCM or ECU case.
CHT: Cylinder Head Temperature. Units are displayed in either degrees Fahrenheit or Celsius.
CHTV: Cylinder Head Temperature Voltage
CKP: Crankshaft Position
CKP_SHLD: Crankshaft Position Shield
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. PCM input signal from the camshaft position sensor.
CMPFM: Camshaft Position Failure Mode. Indicates when the PCM identifies a CMP concern.
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.
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 20°C (68°F), until the temperature of external and internal components stabilizes.
CONT: Continuous Memory. The portion of keep alive memory (KAM) used to store DTCs generated during the continuous memory self-test.
CONTACT: Traction battery contactor status TCM received PID
Continuous Memory Self-Test: A continuous test of the EEC system conducted by the PCM whenever the vehicle is operating.
COP: Coil On Plug. Ignition coil on plug assembly.
CRK_T: Time since engine started PID
CSE GND: Case Ground
CT: Closed Throttle. 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
DC: 1. Direct Current. Electric current flowing in 1 direction. 2. Duty Cycle. The voltage measurement of ON time versus the full cycle period, expressed in percent.
DCE: DC/DC Converter Enable
DCE_F: DC/DC Converter Enable Fault
DCF: DC/DC Converter Fault
DCL: Data Communication Link. A communication path between various in-vehicle electronic modules. Accessed by diagnostic tools through the data link connector (DLC).
Digital: Controls process information by switching the current or voltage ON and OFF.
DIS: Distributorless Ignition System. A system in which the ignition coil secondary circuit is sequenced without a distributor.
DLC: Data Link Connector. 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.
DRI: Deposit Resistant Injector. A fuel injector designed to prevent the build-up of carbon and other unwanted deposits.
DRIVECT: Number of completed OBD Drive Cycles PID
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.
ECT: Engine Coolant Temperature. Displayed in either Fahrenheit or Celsius.
ECTV: Electronically Controlled Continuously Variable Transaxle
EEC: Electronic Engine Control
EEC-V: Fifth-generation EEC system
EEPROM: Electrically Erasable Programmable Read Only Memory
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.
EGRMC (1-4): Electric Exhaust Gas Recirculation Motor Control
EGRMC_F (1-4): Electric Exhaust Gas Recirculation Motor Control Fault
EGRMDSD: Electric Exhaust Gas Recirculation Motor Desired Position. The PID name used to operate the EEGR valve with diagnostic tools output state control.
EGRT: Exhaust Gas Recirculation Valve Temperature. A temperature sensor that is threaded into the bottom of the intake plenum.
EI: Integrated Electronic Ignition. An electronic ignition system that has the ignition control module (ICM) integrated into the PCM.
EI-LDR: Electronic Ignition-Low Data Rate
ENG CTO: Vehicle speed TCM received PID
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.
EOT: Engine Oil Temperature
EPA: Environmental Protection Agency (United States Government)
EPROM: Erasable Programmable Read-Only Memory. An electronic component in the PCM that allows the electronic storage of information.
ESM: EGR System Module
ETC: Electronic Throttle Control
ETCVREF: Voltage Reference (5V) for ETC (APP BVREF, TP BVREF)
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 concern 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 Monitor test.
EVAPCVF: Evaporative Canister Vent Solenoid Fault.
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.
EVAPVMA: Evaporative Vapor Management Valve Internal Circuit Monitor
EVO: Electronic Variable Orifice
EVMV: Electric Vapor Management Valve. Also known as the EVAP canister purge valve.
Exciter Ring: A toothed or notched iron or steel disk which is the moveable part of a speed sensor.
FAN: Fan Speed
FC, FC1, FC2, FC3: Fan Control
FCS: Fuel Control Solenoid
FCIL: Fuel Cap Indicator Lamp. Indicates the fuel filler cap is not correctly installed.
FEAD: Front End Accessory Drive
FEPS: Flash EEPROM Programming Signal. 18-volt DC signal sent by the diagnostic tool to initiate PCM reprogramming.
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.
FPC: Fuel Pump Control
FPDM: Fuel Pump Driver Module. A module that controls the electric fuel pump.
FPF: Fuel Pump Fault. Identifies whether a concern exists in the FP circuit.
FPM: Fuel Pump Monitor. Monitors the fuel pump/circuits for concerns.
Freeze Frame: A block of memory containing the vehicle operating conditions at a specific time.
FRP: Fuel Rail Pressure
FRPT: Fuel Rail Pressure Temperature Sensor
FRP V: Fuel Rail Pressure Voltage. A voltage input to the PCM from the fuel rail pressure sensor
FRT: Fuel Rail Temperature
FRT_V: Fuel Rail Temperature Voltage
FRTMPAB: Engine Fuel Temperature-Bank 1 Input
FSC: Fail-Safe Cooling
FTIV: Fuel Tank Isolation Valve
FTP: Fuel Tank Pressure
FTP V: Fuel Tank Pressure Voltage. From the FTP transducer
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 time of last data update.
FUELPW1: Fuel Injector Pulse Width Number 1. Corresponds to injectors normally affected by HO2S11.
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
GCLTEMP: Generator Motor Coil Temperature
GCU: Generator Control Unit
GENMODE: Generator Motor operational mode TCM received PID
GND: Ground
GPM: Grams per Mile. Also known as Gallons per Minute.
Green State Vehicle: Formally known as California Emissions. A vehicle that is equipped with California on-board diagnostics.
GSDN: Generator Motor Shutdown
G_SDN: Generator Motor Shutdown Request PCM PID
G_SDN_A, G_SDN_C: Generator Motor Shutdown Request TCM PIDs
G_SPEED: Generator Motor Speed
GTQ_CMD: Measured generator motor torque PID
GTQ_OUT: Desired generator motor torque TCM received PID
G_INV_V: Actual generator motor inverter voltage
G_PHTEMP: Highest of 3 phases generator motor inverter temperature
GVW: Gross Vehicle Weight
Hall Effect: A process where current is passed through a small portion of semiconductor material and a magnetic field to produce a small voltage in the semiconductor.
Hard Fault: A concern 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 concern in the HFC circuit.
HFPIP: PIP up edge to PIP down edge time
High Speed CAN: High Speed Controller Area Network
HLOS: Hardware Limited Operating Strategy. A mode of operation where the PCM replaces output commands with fixed values in response to internal PCM malfunctions.
HO2S: Heated Oxygen 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.
HPUMP: Heater Pump Control
HPUMP_F: Heater Pump Fault
HTR, HTR11, HTR12: HO2S Heater. Heater element for the HO2S sensor.
HTR11F, HTR12F: HO2S Heater Fault
HV_AMP: Traction battery current TCM received through the communication network PID.
HVBAT_V: Traction battery voltage TCM received through the communication network PID.
HVIL: High Voltage Interlock Circuit
HVINTLCK: High Voltage Interlock Circuit Status PID
HVIN: High Voltage Interlock Negative Circuit
HVIP: High Voltage Interlock Positive Circuit
HVN: High Voltage Negative Circuit
HVP: High Voltage Positive Circuit
Hydrogen: Chemical symbol H. Highly flammable gas.
Hz: Hertz. Cycles per second
IAT: Intake Air Temperature
IAT_V: Intake Air Temperature Voltage. Actual voltage drop across the IAT sensor.
IC: Integrated Circuit. A small semi-conductor device capable of doing many separate circuit functions.
IFS: Inertia Fuel Shut Off
IGN GND: Ignition Ground
Ignition: System used to provide high voltage spark for engines
IGN_KEY: Ignition Key
IGN_OFF: Ignition Switch Position OFF Input PID
IGN_R: Ignition Switch Position RUN Input PID
IGN_R/S: Ignition Switch Position START Input PID
IGN_SW: Ignition Switch Position
IMAP: Inferred MAP
IMRC: Intake Manifold Runner Control. Controls or modifies airflow through the engine air intake system.
IMRCM: Intake Manifold Runner Control Monitor. Monitors the IMRC circuits for concerns.
INJ1, INJ2, INJ3, INJ4: Injector number or its signal output from the PCM.
INJ_TIM: Injector Timing Before Top Dead Center
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.
IPC: Independent Plausibility Checker
ISDN1, ISDN2: Immediate Shutdown Circuits 1 and 2
I_SDN_1, I_SDN_2: Immediate Shutdown 1 and 2 PIDs
ISP-R: Ignition Switch Position RUN Circuit
ISP-R/S: Ignition Switch Position START Circuit
ISO: International Standards Organization
ITCC: Intelligent Torque Controlled Coupling
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. A dedicated and unswitched power circuit that maintains KAM.
KEYPWR: Key Power. Battery voltage supplied when the ignition key is in the ON position.
Knock: A sharp metallic sound produced when 2 combustion pressure fronts collide in the combustion chamber of an engine.
KOEO Self-Test: Key On Engine Off Self-Test. A test of the EEC system conducted by the PCM with power applied and the engine at rest.
KOER Self-Test: 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.
Km/h: Kilometers Per Hour
kPa: Kilopascal. Unit of pressure. 3.386 kPa equals 1 inch of mercury (Hg.)
KS1: Knock Sensor Bank 1. Detects engine knock.
L: Liters. The unit of volume in the metric measuring system. One liter equals 1.06 quarts.
LDR: Low Data Rate. Type of misfire monitor.
LFC: Low Fan Control
LFCF: Low Fan Control Fault
LOAD: Calculated Engine Load
LONGFT1: Long-Term Fuel Trim Bank 1. Fuel flow adjustment determined by the PCM.
LOOP: Indicates OPEN or CLOSED loop status.
LOS: Limited Operating Strategy
LOSSTRT: Limited Operating Strategy related to the engine no start condition
LOS_BRK: Limited Operating Strategy related to regenerative braking concern
LOS_ENG: Limited Operating Strategy related to the engine concern
LOS_ETC: Limited Operating Strategy related to the ETC system concern
LOS_EQ: Limited Operating Strategy related to the E-Quizzer detected concern
LOS_GEN: Limited Operating Strategy related to the generator motor concern
LOS_HV: Limited Operating Strategy related to the high voltage traction battery concern
LOS_IPC: Limited Operating Strategy related to the independent plausibility checker detected concern
LOS_KEY: Limited Operating Strategy related to the ignition key position concern
LOS_LV: Limited Operating Strategy related to the low voltage system concern
LOS_MOT: Limited Operating Strategy related to the traction motor concern
LOS_TCM: Limited Operating Strategy related to the transaxle concern
LPLR: Low Pressure Low Resistance fuel injector
MAF: Mass Air Flow
MAF_V: Mass Air Flow Voltage
MAF RTN: Mass Air Flow Return. A return circuit for the MAF sensor.
MAP: Manifold Absolute Pressure. The internal pressure of the intake manifold.
MAP_V: Manifold Absolute Pressure Voltage
MCLTEMP: Traction Motor Coil Temperature
MCU: Motor Control Unit
MECT: Motor Electronics Cooling Temperature
MEECT_V: Motor Electronics Cooling Temperature Voltage
MECP: Motor Electronics Cooling Pump Control
MECP_F: Motor Electronics Cooling Pump Fault
MECP_V: Motor Electronics Cooling Pump Voltage
MFC: Medium Fan Control
Microprocessor: A device that controls logic and arithmetic functions.
MIL: Malfunction Indicator Lamp. An indicator lamp alerting the driver of an emission related malfunction.
MISF: Misfire. Any event in the cylinder that causes a sudden change in acceleration of the crankshaft.
MSDN: Motor Shutdown
M_SDN: Motor Shutdown Request PCM PID
M_SDN_A, M_SDN_C: Traction motor shutdown request TCM PIDs
MTQ_CMD: Measured traction motor torque PID
MTQ_OUT: Desired traction motor torque TCM received PID
M_INV_V: Actual traction motor inverter voltage
M_PHTEEMP: Highest of 3 phases traction motor inverter temperature
M_SPEED: Traction Motor Speed
MY: Model Year
NC: Normally Closed
NGS: New Generation Self-Test Automatic Readout (STAR) tester.
NO: Normally Open
NOx: Oxides of Nitrogen. Formed at high combustion temperatures.