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Home > Knowledge Base > Automotive Acronyms

Automotive Acronyms

4WD Four-Wheel Drive
A/C air conditioning
A/F air/fuel ratio
A/T automatic transmission or transaxle
A/T automatic transmission
AAA American Automobile Association
AAV anti-afterburn valve (Mazda)
ABS Anti-Lock Braking System
ABSV air bypass solenoid valve (Mazda)
AC air cleaner
AC Air Conditioning
AC alternating current
ACTS air charge temperature sensor (Ford)
AERA Automotive Engine Rebuilders Assn.
AFM air flow meter
AFS air flow sensor (Mitsubishi)
AIR secondary air injection
AIR Air Injection Reaction (GM)
AIR secondary air injection
AIR Air Injection Reaction (GM)
AIS Air Injection System (Chrysler)
AIS automatic idle speed motor (Chrysler)
ALCL assembly line communications link (GM)
ALDL assembly line data link (GM)
AMG Aufrecht, Melcher, Grossaspach (see www.mbusa.com)
API American Petroleum Institute
APS absolute pressure sensor (GM)
APS atmospheric pressure sensor (Mazda)
APS absolute pressure sensor (GM)
ASD automatic shutdown relay (Chrysler)
ASDM airbag system diagnostic module (Chrysler)
ASE Automotive Service Excellence
ATC after top  center
ATDC after top dead center
ATF automatic transmission fluid
ATMC Automotive Training Managers Council
ATS air temperature sensor (Chrysler)
ATV All Terrain Vehicle
AWD All-Wheel Drive
AWD all-wheel drive
B+ battery positive voltage
BARO barometric pressure sensor (GM)
BARO barometric pressure
BAT battery
BCM body control module (GM)
BHP brake horsepower
BID Breakerless Inductive Discharge (AMC)
BMAP barometric/manifold absolute pressure sensor (Ford)
BMW Bayerische Motoren Werke (Bavarian Motor Works)
BP backpressure sensor (Ford)
BPS barometric pressure sensor (Ford & Nissan)
BPT back-pressure transducer
BTC before top center
BTDC before top dead center
Btu British thermal units
C  Celsius
C3 Computer Command Control system (GM)
C3I Computer Controlled Coil Ignition (GM)
C4 Computer Controlled Catalytic Converter system (GM)
CAA Canadian Auto Association
CAAT Council of Advanced Automotive Trainers
CAC charge air cooler
CAFE Corporate Average Fuel Economy
CAFE corporate average fuel economy
CALPAK calibration pack
CANP canister purge solenoid valve (Ford)
CARB California Air Resources Board
CAS Clean Air System (Chrysler)
CAS crank angle sensor
CAS Clean Air System (Chrysler)
CAS crank angle sensor
CC catalytic converter
CC cubic centimeters
CCC Computer Command Control system (GM)
CCD computer controlled dwell (Ford)
CCEI Coolant Controlled Idle Enrichment (Chrysler)
CCEV Coolant Controlled Engine Vacuum Switch (Chrysler)
CCOT clutch cycling orifice tube
CCP controlled canister purge (GM)
CCV canister control valve
CCV canister control valve
CDI Capacitor Discharge Ignition (AMC)
CEAB cold engine air bleed
CEC Crankcase Emission Control System (Honda)
CECU central electronic control unit (Nissan)
CER cold enrichment rod (Ford)
CESS cold engine sensor switch
CFC Chlorofluorocarbons
CFI continuous fuel injection
CFI Cross Fire Injection (Chevrolet)
cfm cubic feet per minute
CID cylinder identification sensor (Ford)
CID cubic inch displacement
CIS Continuous Injection System (Bosch)
CKP crankshaft position sensor
CKP REF crankshaft reference
CKP crankshaft position sensor
CKP REF  crankshaft reference
CL closed loop
CMP camshaft position sensor
CMP REF camshaft reference
CMP camshaft position sensor (GM)
CMP camshaft position sensor
CMP REF   camshaft reference
CMP camshaft position sensor (GM)
CO carbon monoxide
CO2 carbon dioxide
COP Coil On Plug ignition
CP canister purge (GM)
CP crankshaft position sensor (Ford)
CP canister purge (GM)
CP crankshaft position sensor (Ford)
CPI Central Port Injection (GM)
CPP clutch pedal position
CPU central processing unit
CSC Coolant Spark Control (Ford)
CSSA Cold Start Spark Advance (Ford)
CSSH Cold Start Spark Hold (Ford)
CTAV Cold Temperature Actuated Vacuum (Ford)
CTO Coolant Temperature Override Switch (AMC)
CTOX continuous trap oxidizer
CTP closed throttle position
CTS charge temperature switch (Chrysler)
CTS coolant temperature sensor (GM)
CTS charge temperature switch (Chrysler)
CTS coolant temperature sensor (GM)
CTVS choke thermal vacuum switch
CVCC Compound Vortex Controlled Combustion system (Honda)
CVR control vacuum regulator (Ford)
dB decibels
DC direct current
DEFI Digital Electronic Fuel Injection (Cadillac)
DEPS digital engine position sensor
DERM diagnostic energy reserve module (GM)
DFCO decel fuel cut-off mode
DFI direct fuel injection
DFS deceleration fuel shutoff (Ford)
DIS Distributorless Ignition System (Ford)
DIS Direct Ignition System (GM)
DLC data link connector (GM)
DOHC Dual Overhead Camshafts
DOT Department of Transportation
DRBII Diagnostic Readout Box (Chrysler)
DRCV distributor retard control valve
DSSA Dual Signal Spark Advance (Ford)
DTC diagnostic trouble code
DTM diagnostic test mode
DVDSV differential vacuum delay and separator valve
DVDV distributor vacuum delay valve
DVOM digital volt ohm meter
EACV electronic air control valve (Honda)
EBCM electronic brake control module (GM)
EBCM electronic brake control module
EBM electronic body module (GM)
EBTCM electronic brake traction control module
EC engine control
ECA electronic control assembly
ECCS Electronic Concentrated Control System (Nissan)
ECL engine coolant level
ECM electronic control module (GM)
ECS Evaporation Control System (Chrysler)
ECT engine coolant temperature (Ford & GM)
ECT engine coolant temperature (Ford & GM)
ECU electronic control unit (Ford, Honda & Toyota)
EDIS Electronic Distributorless Ignition System (Ford)
EEC Evaporative Emission Controls (Ford)
EEC Electronic Engine Control (Ford)
EEC Electronic Engine Control (Ford)
EECS Evaporative Emissions Control system (GM)
EEPROM elecrically erasable programmable read only memory
EEPROM electronically erasable programmable read only memory chip
EFC electronic fuel control
EFC electronic feedback carburetor (Chrysler)
EFCA electronic fuel control assembly (Ford)
EFE Early Fuel Evaporation system (GM)
EFI Electronic Fuel Injection
EFI electronic fuel injection
EGO exhaust gas oxygen sensor (Ford)
EGR exhaust gas recirculation
EGRPS EGR valve position sensor (Mazda)
EGR-SV EGR solenoid valve (Mazda)
EGRT EGR temperature
EGRTV EGR thermo valve (Chrysler)
EI electronic ignition (GM)
ELB Electronic Lean Burn (Chrysler)
EM engine modification
EMI electromagnetic interference
EOS exhaust oxygen sensor
EPA Environmental Protection Agency
EPOS EGR valve position sensor (Ford)
EPROM erasable programmable read only memory chip
ESA Electronic Spark Advance (Chrysler)
ESC Electronic Spark Control (GM)
ESS Electronic Spark Selection (Cadillac)
EST Electronic Spark Timing (GM)
EVAP evaporative emission system
EVP EGR valve position sensor (Ford)
EVRV electronic vacuum regulator valve for EGR (GM)
F   Fahrenheit
FBC feedback carburetor system (Ford & Mitsubishi)
FBCA feedback carburetor actuator (Ford)
FC fan control
FCA fuel control assembly (Chrysler)
FCS fuel control solenoid (Ford)
FDC fuel deceleration valve (Ford)
FEEPROM flash electrically erasable programmable read only memory
FF flexible fuel
FI fuel injection
FIAT Fabbrica Italiana Automobili Torino
FLS fluid level sensor (GM)
FMVSS Federal Motor Vehicle Safety Standards
FP fuel pump
FPROM flash erasable programmable read only memory
FT fuel trim
ft.lb. foot pound
FTP federal test procedure
FWD front-wheel drive
gal gallon
GCM governor control module
GEN generator
GM General Motors
GMC General Motors Corporation
GND ground
GPM grams per mile
GT Gran Turismo or Grand Tourism
GTO Grand Tourism Over (refers to engine displacement compared to the competition maximum for the GT category)
GTU Grand Tourism Under (refers to engine displacement compared to the competition maximum for the GT category)
H20 water
HAIS Heated Air Intake System (Chrysler)
HC hydocarbon
HEGO heated exhaust gas oxygen sensor
HEI High Energy Ignition (GM)
HEMI Hemispherical Combustion Chamber
Hg mercury
HO2S heated oxygen sensor
HO2S1 upstream heated oxygen sensor
HO2S2 up or downstream heated oxygen sensor
HO2S3 downstream heated oxygen sensor
hp horsepower
HVAC heating ventilation and air conditioning system
HVS high voltage switch
I/M inspection/maintenance
I/P instrument panel
IA intake air
IAC idle air control (GM)
IAT inlet air temperature sensor (Ford)
IATS intake air temperature sensor (Mazda)
IC integrated circuit
IC ignition control circuit
ICM ignition control module
ICM ignition control module
ICS idle control solenoid (GM)
ID inside diameter
IFI indirect fuel injection
IFS Infiniti Financial Services
IFS inertia fuel shutoff
IGN ignition
IHI Ishikawajima Harima Heavy Industries (turbo manufacturers)
IM240 inspection/maintenance 240 program
IPC instrument panel cluster
ISC idle speed control (GM)
ISO International Standards Organization
ITCS Ignition Timing Control System (Honda)
ITS idle tracking switch (Ford)
JAS Jet Air System (Mitsubishi)
kHz kilohertz
KKK Kuhnle, Kopp & Kausch (turbo manufacturers)
Km kilometers
KOEC key on, engine cranking
KOEO key on, engine off
KOER key on, engine running
kPa kilopascals
KS knock sensor
KSM knock sensor module
KV kilovolts
L liters
lb. ft. pound feet
LCD liquid crystal display
LED light emitting diode
LT long term fuel trim
LTD Limited
LTFT long term fuel trim
MACS Mobile Air Conditioning Society
MAF mass airflow sensor
MAMA Midwest Automotive Media Assn.
MAP manifold absolute pressure
MAP Motorist Assurance Program
MAT manifold air temperature
MC mixture control
MCS mixture control solenoid (GM)
MCT manifold charge temperature (Ford)
MCU Microprocessor Controlled Unit (Ford)
MDP manifold differential pressure
MDP manifold differential pressure
MFI multiport fuel injection
MIL malfunction indicator lamp
MISAR Microprocessed Sensing and Automatic Regulation (GM)
mm millimeters
MPFI multi point fuel injection
MPG Miles Per Gallon
MPH miles per hour
MPI multi port injection
MR2 Mid-engine Runabout/Rear-drive two-seater (Toyota)
ms millisecond
MSDS material safety data sheet
MST manifold surface temperature
mV millivolts
MVZ manifold vacuum zone
NACAT National Assn. of College Automotive Teachers
NATEF National Automotive Technician's Education Foundation
NHTSA National Highway Traffic Safety Administration
Nm Newton meters
NMAC Nissan Motor Acceptance Corporation
NOX oxides of nitrogen
NVRAM nonvolatile randon access memory
O2S oxygen sensor
OBD onboard diagnostics
OBD I onboard diagnostics generation one
OBD II onboard diagnostics, second generation
OC oxidation catalyst
OC oxidation converter (GM)
OD outside diameter
ODM output device monitor
OE original equipment
OEM Original Equipment Manufacturer (usually in reference to car parts)
OHC overhead cam
OHV Overhead valve
OL open loop
ORC oxidation reduction catalyst (GM)
OS oxygen sensor
OSAC Orifice Spark Advance Control (Chrysler)
OSC oxygen sensor storage
P/B power brakes
P/N part number
PA pressure air (Honda)
PAFS Pulse Air Feeder System (Chrysler)
PAIR pulsed secondary air injection
PAIR Pulsed Secondary Air Injection system (GM)
PAIR pulsed secondary air injection
PCM powertrain control module (supercedes ECM)
PCV positive crankcase ventilation
PECV power enrichment control valve
PERA Production Engine Rebuilders Assn.
PFI port fuel injection (GM)
PGM-FI Programmed Gas Management Fuel Injection (Honda)
PIP profile ignition pickup (Ford)
PIP profile ignition pickup (Ford)
PNP park/neutral switch
PPM parts per million
PROM program read only memory
PROM program read only memory computer chip
PS power steering
PSA Peugeot-CitroŽn SA
PSA pressure switch assembly
PSI pounds per square inch
PSP power steering pressure
pt. pint
PTOX periodic trap oxidizer
PVA ported vacuum advance
PVS ported vacuum switch
QS9000 Quality assurance standard
Qt. quart
RABS Rear wheel Antilock Brake System (Ford)
RAM random access memory
RFI radio frequency interference
RM relay module
ROM read only memory
RPM revolutions per minute
RPO regular production option
RV Recreational Vehicle
RWAL Rear Wheel Antilock brake system (GM)
RWD rear-wheel drive
SAE Society of Automotive Engineers
SAP accelerator pedal
SAVM spark advance vacuum modulator
SC supecharger
SCB supercharger bypass
SCC Spark Control Computer (Chrysler)
SDI Saab Direct Ignition
SDM sensing diagnostic mode
SES service engine soon indicator (GM)
SFI Sequential Fuel Injection (GM)
SIR Supplemental Inflatable Restraint (air bag)
SMPI Sequential Multiport Fuel Injection (Chrysler)
SOHC Single Overhead Camshaft
SPOUT Spark Output signal (Ford)
SRDV spark retard delay valve
SRI service reminder indicator
SRS Supplemental Restraint System (air bag)
SRT system readiness test
SS speed sensor (Honda)
SSI Solid State Ignition (Ford)
ST short term fuel trim
STFT short term fuel trim
STS Service Technicians Society
TA temperature air (Honda)
TABPV throttle air bypass valve (Ford)
TAC thermostatic air cleaner (GM)
TACH tachometer
TAD Thermactor air diverter valve (Ford)
TAV temperature actuated vacuum
TB throttle body
TBI throtle body injection
TC turbocharger
TCC torque converter clutch
TCC torque converter clutch (GM)
TCCS Toyota Computer Controlled System
TCM transmission or transaxle control module
TCS Transmission Controlled Spark (GM)
TDC top dead center
TDI Turbodiesel Intercooler
TFP throttle fluid pressure
TIC thermal ignition control (Chrysler)
TIV Thermactor idle vacuum valve (Ford)
TKS throttle kicker solenoid (Ford)
TP throttle position
TP throttle position sensor (Ford)
TPI Tuned Port Injection (Chevrolet)
TPP throttle position potentiometer
TPS throttle position sensor
TPT throttle position transducer (Chrysler)
TRD Toyota Racing Development
TRS Transmission Regulated Spark (Ford)
TSP throttle solenoid positioner (Ford)
TT Touring Turismo
TV throttle valve
TVS thermal vacuum switch (GM)
TVV thermal vacuum valve (GM)
TWC three way caalyst
TWC+OC three way + oxidation catalytic converter
USAA United Services Automobile Association
V volts
VAC volts alternating current
VAF vane airflow sensor
VAF volume airflow
VAF vane airflow sensor
VCC viscous converter clutch (GM)
VCM vehicle control module
VDC volts direct current
VDV vacuum delay valve
VIN vehicle identification number
VR voltage regulator
VS vehicle sensor
VSS vehicle speed sensor
VW Volkswagen
WOT wide open throttle switch (GM)
WSS wheel speed sensor
WU-TWC warm up three way catalytic converter
YMMV Your Mileage May Vary
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