Automotive Definitions


Staff member
Nov 13, 2006
ABS Anti-lock Braking System
ABDC After Bottom Dead Center
A/C Air Conditioning
Acc Accessories
ACL Automatic Chassis Lubrication System
ACP Air Conditioner Pressure sensor
ACT Air Charge temperature
A.I.R. Air Injection Reaction system
AIS Automatic Idle Speed
AICS Air Induction Control System
A/F Air to Fuel ratio
ALDL Assembly Line Data Link
APS Atmospheric Pressure Sensor
ARCS Active Roll Control system
AS Airflow Sensor
ASD Automatic Slip-Control Differential
ASR Anti Slip Regulation
ATC Automatic Temperature Control
ATDC After Top Dead Center
ATF Automatic Transmission Fluid
ATS Air Temperature Sensor
AWD All Wheel Drive
AWS All Wheel Steering
BARO Barometric Pressure Sensor
B+ Battery Positive terminal
BATT + Battery Positive
BATT - Battery Negative
BBDC Before Bottom Dead Center
BCS Boost Control Solenoid
BDC Bottom Dead Center
BHP Brake Horse Power
BMEP Brake Mean Effective Pressure
Bearing Oil Film Thickness

BSFC Brake Specific Fuel Consumption
BTDC Before Top Dead Center
CAND Canister Purge Solenoid
CAFE Corporate Average Fuel Economy
CAG Computer Aided Gearshift
CAS Crank Angle Sensor
CB Contact Breaker
CBE Cab Behind Engine
CC Cruise Control
CCC Computer Command Control (GM)
CCS Coast Clutch Solenoid
Cod Coefficient of Drag
CD Capacity Discharge
CFC Chlorofluorocarbon
CI Compression Ignition
Cid Cubic Inch Displacement
CIS Continuous Injection System
CIS-E Continuous Injection System electronic controls
CIS-Lambda above w/ O2 sensor
CKP Crank Position Sensor
CO Carbon Monoxide
COE Cab Over Engine
CPS Crank Position Sensor
CR Compression Ratio
CTX Continuously Variable
CV Constant Velocity joints
DC Direct Current
DCA Dessicant Coolant Additive
DI Direct Injection
DIS Direct Injection System
DLC Data Link Connector
DOHC Double Overhead Camshafts
DTC Diagnostic Trouble Codes
DVOM Digital Volt/Ohm Meter
EBS Electronic Braking System
ECI Electronically Controlled Injection
ECM Electronic Control Module
ECS Evaporative Control System
ECS Electronically Controlled Suspension
ECT Engine Coolant Temperature
ECU Electronic Control Unit
EDC Electronic Diesel Control
EFC Electronic Feedback Carberator
EFI Electronic Fuel Injection
EGO Exhaust Gas Oxygen Sensor
EGR Exhaust Gas Recirculation
EMS Engine Management System
EP Extreme Pressure (lubrication)
EPAS Electrical Power Assisted Steering
EPHS Electrically Powered Hydraulic Steering
EPROM Eraseable Programmable Read Only Memory (GM)
EPS Electric Power Steering
ESS Engine Speed Sensor
EST Electronic Spark Timing
EUI Electronic Control Unit
EVAP Evaporative Emission System
EVC Exhaust Valve Close
EVO Exhaust valve Open
FCS Fuel Cutoff Solenoid
FWD Front Wheel Drive
GCW Gross Combination Weight
GRP Glass Reinforced Plastics
GTW Gross Train Weight
GV Governor Valve
GVW Gross Vehicle Weight
HC Hydrocarbons
HFC HydroFlouoroCarbons
HGV Heavy Goods Vehicle
HO2S Heated Oxygen Sensor
HUCR Highest Useful Compression Ratio
HVAC Heating, Ventilation and Air Conditioning
IAC Idle Air Control valve
ID Inside Diameter
IFS Independent front Suspension
IHP Indicated Horse Power
INJ Injection (timing)
IOE Inlet Over Exhaust (valve layout)
IRS Independent Rear Suspension
ISC Idle Speed Controller
ISCV Idle Speed Control Valve
IVC Inlet Valve Close
IVO Inlet Valve Open
KNOCK Detonation Sensor
KPI King Pin Inclination
LGV Large Goods vehicle
LI Load Index
LS Leading Shoe ( brakes )
MAF Mass Air Flow
MAP Manifold Absolute Pressure
MAT Manifold Air Temperature
MFI Multiport Fuel Injection
MIL Malfunction Indicator Lamp
MOFT Minimum Oil Film Thickness
MON Motor Octane Number
MPI Multi Point Injection
MPV Multi Purpose Vehicle
MRL Maintenance Reminder Light
NO Nitrogen Oxide
NOS New Old Stock
NOX Nitrogen Oxide
NO2 Nitrous Oxide (GO FAST)
NVH Noise Vibration Harshness
O2 Oxygen sensor
OBD On Board Diagnostics
OD Outside Diameter
OD Over Drive
ODP Ozone Depletion Potential
OHC Overhead Camshaft
OHV Overhead Valve
ON Octane Number
PAS Power Assisted System
PBD PolyButaDiene ( tires)
PCM Power Control Module
PCV Positive Crankcase ventilation
PFE Pressure Feedback EGO
PFI Port Fuel Injection
PIP Profile Ignition Pickup
PR Ply Rating
PSI Pounds per Square Inch
PTFE PolytetraflouoroEthylene
PTO Power Take Off
RC Roll Center
RON Research Octane Number
RTV Room Temperature Vulcanizing
RWD Rear Wheel Drive
SAMT Semi Automated Mechanical Transmission
SBR Styrene Butadiene (tires)
SCA Supplemental Coolant Additives
SCS Stop Control System
SEFI Sequential Electronically controlled Fuel Injection
SFC Specific Fuel Consumption
SFI Sequential Fuel Injection
SI Spark Ignition
SIL Shift Indicator Light
SLA Short and Long Arm suspension
SM Step Motor
SOHC Single Overhead Camshaft
SPI Single Point Injection
SPOUT Spark Output Signal
SRI Service Reminder Indicator
SS Speed Sensor
STAR Self-test Automatic Readout
STO Self Test Output
SV Side Valves
TAC Thermostatic Air Cleaner
TADS Thermactor Air Diverter Solenoid
TAS Throttle Angle Sensor
TBI Throttle Body Injection
TC Twin Carburetors
TCC Torque Converter Solenoid
TCI Transistorized Coil Ignition
TCM Transmission Control Module
TCS Transmission Controlled Spark
TDC Top Dead Center
TDI Turbocharged Direct Injection
TEL Tetraethyl Lead
TML TetraMethylLead
TPS Throttle Position Sensor
TS Trailing shoe
TSS Transmission Speed Sensor
TV Throttle Valve
TVS Thermal Vacuum Switch
TWC Three Way Catalyst
TXV Thermostatic expansion Valve
UJ Universal Joint
VAF Vane Overflow Sensor
VAT Vane Air Temperature Sensor
VCP Variable Cam Phasing
VCU Viscous Coupling Unit
VDC Vehicle Dynamics Control
VI Viscosity Index
VIVT Variable Inlet Valve
VOM Volt/Ohm Meter
VSS Vehicle Speed Sensor
WDS Wastegate Duty Solenoid
WOT Wide Open Throttle