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  • 2WD:  2 Wheel Drive
  • 4WD:  4 Wheel Drive
  • 4WS:  4 Wheel Steering
  • 2V:  2 Valve (cylinder head)
  • 4V:  4 Valve (cylinder head)
  • AAT:  Ambient Air Temperature
  • ABS:  Antilock Brake System
  • AC:  Air Conditioning
  • ACC:  Adaptive Cruise Control also Automatic Climate Control
  • A/F sensor:  Air Fuel Sensor
  • AFR:  Air Fuel Ratio
  • alt:  Alternator
  • ARS:  Automatic Restraint System
  • ARC:  Automatic Ride Control
  • A/T:  Automatic Transmission
  • ATC:  Automatic Temperature Control
  • ATF: Automatic Transmission Fluid
  • AWD:  All Wheel Drive
  • AYC:  Active Yaw Control
  • Baro:  Barometric pressure. Usually a sensor.
  • batt:  Battery
  • BCM:  Body Control Module
  • BHP:  Brake Horsepower
  • BTDC:  Before Top Dead Center
  • CAA:  Clean Air Act
  • CAFE:  Corporate Average Fuel Economy (USA)
  • CEL:  Check Engine Light
  • CFI:  Central Fuel Injection
  • CFM:  Cubic Feet Per Minute
  • CG: Center of Gravity
  • CID:  Cubic Inch Displacement
  • CKP Crankshaft Position
  • CL:  Closed Loop
  • cmd:  Command
  • CMP:  Camshaft Position
  • CNG:  Compressed Natural Gas
  • CO:  Carbon Monoxide
  • comm:  Communication
  • CO2:  Carbon Dioxide
  • COP:  Coil On Plug
  • CPU:  Central Processing Unit
  • CTS:  Coolant Temperature Sensor
  • CV:  Constant Velocity
  • CVT:  Continuously Variable Transmission
  • dB:  Decibels
  • DC:  Direct Current
  • DFI:  Direct Fuel Injection
  • diff:  Differential
  • DIS:  Direct Ignition System
  • dist:  Distributor
  • DLC:  Data Link Connector
  • DMM:  Digital MultiMeter
  • DOHC:  Dual Overhead Cam
  • DPFE:  Differential Pressure Feedback (Ford EGR)
  • DRL:  Daytime Running Lights
  • DTC:  Diagnostic Trouble Code
  • DVOM:  Digital Volt Ohm Meter
  • E4OD:  Electronic 4-speed Overdrive transmission
  • E10:  Ethanol 10%
  • E85:  Ethanol 85%
  • EAS:  Electronically Assisted Steering
  • ECBM:  Electronic Brake Control Module
  • ECM:  Engine Control Module
  • ECM:  Electronic Control Module
  • ECS:  Emission Control System
  • ECT:  Engine Coolant Temperature
  • ECU:  Electronic Control Module
  • EDR:  Even Data Recorder
  • EEC:  Electronic Engine Control
  • EPROM:  Erasable Programable Read Only Memory
  • EFE:  Early Fuel Evaporation
  • EFI:  Electronic Fuel Injection
  • EGR:  Exhaust Gas Recirculation
  • ELC:  Electronic Level Control
  • EPA:  Environment Protection Agency
  • EPC:  Electronic Pressure Control
  • ESC:  Electronic Spark Control
  • ELD:  Electronic Load Detection
  • ESP:  Electronic Stability Program
  • ETC:  Electronic Temperature Control
  • ETS:  Electronic Traction System
  • EV:  Electric Vehicle
  • EVAP:  Evaporative Emissions
  • FBC:  Feedback Carburetor
  • FF:  Flex Fuel
  • FFV:  Flexible Fuel Vehicle
  • FM:  Frequency Modulated
  • FPS:  Fast Pass Standard
  • freq:  Frequency
  • FT:  Fuel Trim
  • FTP:  Fuel Tank Pressure
  • FTPT:  Fuel Tank Pressure Transducer
  • GAWR:  Gross Axle Weight Rating
  • GND:  Ground
  • GPCM:  Glow Plug Control Module
  • GPS:  Global Positioning System
  • GVW:  Gross Vehicle Weight
  • GVWR:  Gross Vehicle Weight Rating
  • H2O:  Water
  • HC:  Hydrocarbons
  • HD:  Heavy Duty
  • HDR:  Hight Data Rate
  • HEGO:  Heated Exhaust Gas Oxygen sensor (Now HO2S)
  • HEV:  Hybrid Electric Vehicle
  • Hg:  Mercury
  • HID:  High Intensity Discharge
  • HO:  High Output
  • HO2S:  Heated Oxygen Sensor
  • hp:  Horsepower
  • HVAC:  Heating Ventilation and Air Conditioning
  • Hz:  Hertz
  • IA:  Intake Air
  • IAC:  Idle Air Control
  • IAT:  Intake Air Temperature
  • iATN:  INternational Automotive Technicians Network
  • IC:  Integrated Circuit
  • IC:  Ignition Control
  • ID:  Identification
  • ID:  Inside Diameter
  • IDI:  Integrated Direct Ignition
  • IDM:  Ignition Diagnostic Module
  • IDM:  Injector Driver Module
  • IDS:  Integrated Diagnostic Software
  • IGN:  Ignition
  • I/M:  Inspection Maintenance
  • IMA:  Integrated Motor Assist
  • INJ: Injector
  • int:  Interior
  • I/O:  In/Out
  • IAC:  Idle Air Control
  • i-VTEC:  Intelligent Variable Valve Timing Electronic Control
  • KAM:  Keep Alive Memory
  • KAPWR:  Keep Alive Memory Power
  • kg:  Kilogram
  • kg/h:  Kilograms per Hour
  • km:  Kilometer
  • km/h:  Kilometer per Hour
  • km/l:  Kilometers per Liter
  • KOEO:  Key Off Engine On
  • KOER:  Key On Engine Running
  • kPa:  Kilopascal
  • KS:  Knock Sensor
  • kv:  Kilovolts
  • L:  Liter
  • L4:  Inlie 4 cylinder engine
  • LCD:  Liquid Crystal Display
  • LCM:  Lighting Control Module
  • LDR:  Low Data Rate
  • LED:  Light Emitting Diode
  • LEP:  Light Emitting Polymer (glows in the dark)
  • LEV:  Low Emissions Vehicle
  • Lm:  Lumens
  • LNG:  Liquid Natural Gas
  • LPG:  Liquid Petroleum Gas
  • LPM:  Liters Per Minute
  • LPS:  Low Pressure Sensor
  • LSD:  Limited Slip Differential
  • LSUV:  Luxury Sport Utility Vehicle
  • LT:  Long Term (Fuel Trim)
  • LTPWS:  Low Tire Pressure Warning System
  • MAF:  Mass Airflow Sensor
  • MAP:  Manifold Absolute Pressure
  • MAT:  Manifold Air Temperature
  • MC:  Mixture Control
  • MCU:  Microprosessor Control Unit
  • MFI:  Multiport Fuel Injection
  • MGMT:  Management
  • MIL: Malfunction Indicator Lamp
  • mm:  Millimeter
  • MSRP:  Manufacturer Suggested Retail Price
  • M/T:  Manual Transmission
  • mV:  Milivolt
  • MV:  Megavolt
  • NC:  Normally Closed
  • NCAP:  New Car Assessment Program
  • NAVI:  Navigation
  • NEG:  Negative
  • NEU:  Neutral
  • NG:  Natural Gas
  • NGV:  Natural Gas Vehicle
  • NO:  Normally Open
  • NOx:  Nitrogen Oxides
  • NPF:  No Problem Found
  • NPTC:  National Pipe Thread Coarse
  • NPTF  National Pipe Thread Fine
  • NV:  Night Vision
  • O2:  Oxygen
  • O2S:  Oxygen Sensor
  • OBD:  On Board Diagnostics
  • OBDII:  On Board Diagnostics generation 2
  • OBDIII:  On Board Diagnostics generation 3
  • OCC:  Output Circuit Check
  • OCR:  Oil Control Ring
  • OD:  Outside Diameter
  • OD:  OverDrive
  • ODO:  Odometer
  • OE:  Original Equipment
  • OEM:  Original Equipment Manufacturer
  • OHC:  Overhead Cam
  • OL:  Open Loop
  • PASS:  Passenger
  • PB:  Power Brakes
  • PC:  Pressure Control
  • PCI:  Programable Controller Interface
  • PCM:  Powertrain Control Module
  • PFE:  Pressure Feedback EGR
  • PGMFI:  Programable Multiport Fuel Injection
  • PID:  Parameter Identification
  • PIM:  Power Inverter Module
  • PIP:  Profile Ignition Pickup (also CKP Crank Position)
  • POS:  Positive
  • POT:  Potentiometer
  • ppm:  Parts Per Million
  • PRNDL:  Park Reverse Neutral Drive Low
  • PROM:  Programable Read Only Memory
  • PS:  Power Steering
  • PSA:  Pressure Switch Assembly
  • psgr:  Passenger
  • psi:  Pounds Per Square Inch
  • psi a:  Ponds Per Square Inch Absolute
  • psig:  Pounds Per Square Inch Gauge
  • PSP:  Power Steering Pressure
  • PTC:  Pending Trouble Code
  • PTC:  Positive Temperature Coefficient
  • PTO:  Power Take Off
  • PWM:  Pulse Width Modulation
  • PWR:  Power
  • RAM:  Random Access Memory
  • rec:  Receive
  • REDOX:  Reduction Oxidation Catalytic Converter
  • REF:  Reference
  • RFI:  Radio Frequency Interference
  • RFID:  Radio Frequency Identification
  • Rly:  Relay
  • RM:  Relay Module
  • R&R:  Remove and Replace
  • RSC:  Roll Stability Control
  • RTV:  Room Temperature Vulcanizing
  • RV:  Recreational Vehicle
  • RWD:  Rear Wheel Drive
  • SAE:  Society of Automotive Engineers
  • SDL:  Serial Data LInk
  • SEFI:  Sequential Electronic Fuel Injection
  • SEMA:  Special Equipment Market Association
  • SES:  Service Engine Soon
  • SFI:  Sequential Fuel Injection
  • SHO:  Super Hight Output
  • SIR:  Supplemental Inflatable Restraint
  • SNSR:  Sensor
  • SO2:  Sulphur Dioxide
  • SOC:  State of Change
  • sol:  Solenoid
  • S/P:  Series Parallel
  • SPD:  Speed
  • SRS:  Supplemental Restraint System
  • SSV:  Shift Solenoid Valve
  • ST:  Short Term (fuel trim)
  • stdby:  Standby
  • SUV:  Sport Utility Vehicle
  • sw:  Switch
  • SWPS:  Steering Wheel Position Sensor
  • TACH:  Tachometer
  • TB:  Throttle Body
  • TBI:  Throttle Body Injection
  • TC:  Transmission Control
  • TCC:  Torque Converter Clutch
  • TCM:  Transmission Control Module
  • TCS:  Traction Control System
  • TCU:  Transmission Control Unit
  • TDC:  Top Dead Center
  • TEMP:  Temperature
  • TFI:  Thick Film Integrated (Ford Ignition)
  • TFT:  Transmission Fluid Temperature
  • torq:  Torque
  • TP:  Throttle Position
  • TPI:  Tuned Port Injection
  • TPMS:  Tire Pressure Monitoring System
  • TPS:  Throttle Position Sensor
  • trans:  Transmission
  • TSB:  Technical Service Bulletin
  • TSS:  Transmission Speed Sensor
  • TV:  Throttle Valve
  • TVS:  Thermal Vacuum Switch
  • TWC:  Three Way Catalyst
  • U/H:  Under Hood
  • ULEV:  Ultra Low Emissions Vehicle
  • ULSD:  Ultra Low Sulphur Diesel
  • unlk:  Unlock
  • V:  Volts
  • VAC:  Vacuum
  • VAF:  Vane Air Flow
  • VAPS:  Variable Assist Power Steering
  • VB:  Valve Body
  • VCM:  Vehicle Communication Module
  • VCT:  Variable Camshaft Timing
  • VCDS:  Vehicle Dynamics Control System
  • VDR:  Vehicle Data Recorder
  • veh:  Vehicle
  • vel:  Velocity
  • ver:  Version
  • vert:  Vertical
  • VIN:  Vehicle Identification Number
  • VSS:  Vehicle Speed Sensor
  • VSV:  Vacuum Solenoid Valve
  • VTEC:  Variable Timing and Electronic Control
  • VVT-i:  Variable Valve Timing with Intelligence
  • VVTL-i:  Variable Valve Timing and Lift with Intelligence
  • w/:  With
  • w/o:  Without
  • WOT:  Wide Open Throttle
  • WSS:  Wheel Speed Sensor
  • X-valve:  Expansion Valve
  • ZEV:  Zero Emissions Vehicle