ABBREVIATION   EXPLANATION
°C = Degrees Celsius 
°F = Degrees Fahrenheit 
4WAL = Four-Wheel Antilock 
4WD = 4 wheel drive
A = Ampere(s) 
A/C = Air Conditioning 
A/D = Analog to Digital 
A/F = Air/Fuel Ratio 
A/T = Automatic Transmission/Transaxle 
A4WD = Automatic Four-Wheel Drive 
ABS = Anti Lock Braking System
ACC = Automatic Climate Control 
ACL = Air Cleaner 
ALC = Automatic Level Control, Automatic Lamp Control 
AM/FM = Amplitude Modulation/Frequency Modulation 
ATC = Automatic Transfer Case, Automatic Temperature Control 
Auto = Automatic 
avg = Average 
AWD = all wheel drive
B+ = Battery Positive Voltage 
BARO = Barometric Pressure 
BATT = Battery voltage
BATT = Battery 
BBV = Brake Booster Vacuum 
BCA = Bias Control Assembly 
BCM = Body Control Module 
BCS = boost control solenoid
BCV = boost control valve
BDC = Bottom Dead Center 
BHP = Brake Horsepower 
BLK = Black 
BLU = Blue 
BOV = blow off valve
Boxer = A horizontally opposed engine, meaning that the cylinders oscillate in a horizontal motion, rather than a vertical.
BP = Back Pressure 
BPCM = Battery Pack Control Module 
BPMV = Brake Pressure Modulator Valve 
BPP = Brake Pedal Position 
BPV = bypass valve
BRN = Brown 
BTDC = Before Top Dead Center 
BTM = Battery Thermal Module 
BTSI = Brake Transmission Shift Interlock 
Btu = British Thermal Units 
C.A.R.B. = California Air Resource Board
C/Ltr = Cigar Lighter 
CAC = Charge Air Cooler 
CAFE = Corporate Average Fuel Economy
CAFE = Corporate Average Fuel Economy 
CAI = cold air intake
Cal = Calibration 
CAM = camshaft
Cam = Camshaft 
CARB = Carburettor
CARB = California Air Resources Board 
CAT = catalytic converter
CC = Coast Clutch 
CCM = Convenience Charge Module, Chassis Control Module 
CCOT = Cycling Clutch Orifice Tube 
CCP = Climate Control Panel 
CD = Compact Disc 
CE = Commutator End 
CEAB = Cold Engine Air Bleed 
CEL = check engine light
CEMF = Counter Electromotive Force 
CEX = Cabin Exchanger 
cfm = Cubic Feet per Minute 
cg = Center of Gravity 
CHP = Crank Horsepower
CID = Cubic Inch Displacement 
CKP = Crankshaft Position 
CKT = Circuit 
CL = Closed Loop 
CLS = Coolant Level Switch 
cm³ = Cubic Centimetres 
CMC = Compressor Motor Controller 
CMP = Camshaft Position 
CNG = Compressed Natural Gas 
CO = Carbon Monoxide 
CO2 = Carbon Dioxide 
Coax = Coaxial 
COMM = Communication 
Conn = Connector 
CPA = Connector Position Assurance 
CPP = Clutch Pedal Position 
CPS = Cam/Crank Position Sensor
CPS = Central Power Supply 
CPU = Central Processing Unit 
CR = compression ratio
CRT = Cathode Ray Tube 
CRTC = Cathode Ray Tube Controller 
CS = Charging System 
CSFI = Central Sequential Fuel Injection 
CTP = Closed Throttle Position 
cu = ft Cubic Foot/Feet 
cu = in Cubic Inch/Inches 
CV = Constant Velocity Joint 
CVRSS = Continuously Variable Road Sensing Suspension 
Cyl = Cylinder(s) 
D/R = drag radial
DAB = Delayed Accessory Bus 
dB = Decibels 
dBA = Decibels on A-weighted Scale 
DC = Direct Current, Duty Cycle 
DCM = Door Control Module 
DE = Drive End 
DEC = Digital Electronic Controller 
DERM = Diagnostic Energy Reserve Module 
DI = Distributor Ignition 
dia = Diameter 
DIC = Driver Information Center 
Diff = Differential 
DIM = Dash Integration Module 
DIY = do it yourself
DK = Dark 
DLC = Data Link Connector 
DMCM = Drive Motor Control Module 
DMM = Digital Multimeter 
DMSDS = Drive Motor Speed and Direction Sensor 
DMU = Drive Motor Unit 
DOHC = dual over head cam
DOHC = Dual Overhead Camshafts 
DP = down pipe
DPN = direct port nitrous
DR = drag radial
DR, = Drvr Driver 
DRL = Daytime Running Lamps 
DSM = Diamond Star Motors (I.E.: Mitsubishi or in some instances, Plymouth & Eagle)
DTC = Diagnostic Trouble Code 
E/M = English/Metric 
EBCM = Electronic Brake Control Module 
EBTCM = Electronic Brake and Traction Control Module 
EC = Electrical Center, Engine Control 
ECC = Electronic Climate Control 
ECI = Extended Compressor at Idle 
ECL = Engine Coolant Level 
ECM = engine control module
ECM = Engine Control Module, Electronic Control Module 
ECS = Emission Control System 
ECT = engine coolant temp
ECT = Engine Coolant Temperature 
ECU = engine control unit
EEPROM = Electrically Erasable Programmable Read Only Memory 
EEVIR = Evaporator Equalized Values in Receiver 
EFE = Early Fuel Evaporation 
EFI = Electronic Fuel Injection
EFI = Electronic Fuel Injection
EGR = Exhaust Gas Recirculation 
EGR = TVV Exhaust Gas Recirculation Thermal Vacuum Valve 
EGT = exhaust gas temp
EHPS = Electro-Hydraulic Power Steering 
EI = Electronic Ignition 
ELAP = Elapsed 
ELC = Electronic Level Control 
EMF = Electromotive Force 
EMI = Electromagnetic Interference 
EMS = engine management system
Eng = Engine 
EOP = Engine Oil Pressure 
EOT = Engine Oil Temperature 
EPA = Environmental Protection Agency 
EPR = Exhaust Pressure Regulator 
EPROM = Erasable Programmable Read Only Memory 
ESB = Expansion Spring Brake 
ESC = Electronic Suspension Control 
ESD = Electrostatic Discharge 
ESN = Electronic Serial Number 
ETC = Electronic Throttle Control, Electronic Temperature Control, Electronic Timing Control 
ETCC = Electronic Touch Climate Control 
ETR = Electronically Tuned Receiver 
ETS = Enhanced Traction System 
EVAP = Evaporative Emission 
EVO = Electronic Variable Orifice 
Exh = Exhaust 
F/I = forced induction
F4WD = Full Time Four-Wheel Drive 
FC = Fan Control 
FDC = Fuel Data Center 
FED = Federal All United States except California 
FEDS = Fuel Enable Data Stream 
FEX = Front Exchanger 
FF = Front Engine, Front Wheel Drive
FF = Flexible Fuel 
FFH = Fuel-Fired Heater 
FI = Fuel Injection 
FMIC = front mounted intercooler
FMVSS = Federal U.S. Motor Vehicle Safety Standards 
FP = Fuel Pump 
FPR = fuel pressure regulator
FR = Front Engine, Rear Wheel Drive
ft = Foot/Feet 
FT = Fuel Trim 
FW = Flat Wire 
FWD = front wheel drive
FWD = Front Wheel Drive, Forward 
g = Grams, Gravitational Acceleration 
GA = Gage, Gauge 
gal = Gallon 
gas = Gasoline 
GCW = Gross Combination Weight 
Gen = Generator 
GL = Gear Lubricant 
GM = General Motors 
GM = SPO General Motors Service Parts Operations 
gnd = Ground 
gpm = Gallons per Minute 
GRN = Green 
GRY = Gray 
GVWR = Gross Vehicle Weight Rating 
H = Hydrogen 
H/CMPR = High Compression 
H2O = Water 
Harn = Harness 
HC = Hydrocarbons 
HD = Heavy Duty 
HDC = Heavy Duty Cooling 
hex = Hexagon, Hexadecimal 
Hg = Mercury 
Hi = Alt High Altitude 
HID = High Intensity Discharge
HO2S = Heated Oxygen Sensor
HO2S = S1 - Heated O2 sensor bank 1 before cat.
HO2S = S1 - Heated O2 sensor bank 2 before cat. (not applicable to all vehicles)
HO2S = S2 - Heated O2 sensor bank 1 after cat.
HO2S = S2 - Heated O2 sensor bank 2 after cat. (not applicable to all vehicles)
HO2S = Heated Oxygen Sensor 
hp = Horsepower 
HPL = High Pressure Liquid 
HPS = High Performance System 
HPV = High Pressure Vapour 
HPVS = Heat Pump Ventilation System 
Htd = Heated 
HTR = Heater 
HU = head unit
HUD = Heads Up Display 
HUD = Head-up Display 
HVAC = Heater-Ventilation-Air Conditioning 
HVACM = Heater-Vent-Air Conditioning Module 
HVIL = High Voltage Interlock Loop 
HVM = Heater Vent Module 
Hz = Hertz 
I/H/E = intake/header/exhaust
I/PEC = Instrument Panel Electrical Center 
I4 = inline 4
IAC = Idle Air Control 
IAFC = Independent Air/Fuel Controller
IAT = Intake Air temp
IAT = Intake Air Temperature 
IC = intercooler
IC = Integrated Circuit, Ignition Control 
ICCS = Integrated Chassis Control System 
ICM = Ignition Control Module 
ID = Identification, Inside Diameter 
IDI = Integrated Direct Ignition 
IGBT = Insulated Gate Bi-Polar Transistor 
ign = Ignition 
ILC = Idle Load Compensator 
IM = intake manifold
IMG = intake manifold gasket
in = Inch/Inches 
INJ = Injection 
inst = Instantaneous, Instant 
IP = Instrument Panel 
IPC = Instrument Panel Cluster 
IPM = Instrument Panel Module 
ISC = Idle Speed Control 
ISO = International Standards Organization 
ISS = Input Speed Shaft, Input Shaft Speed 
JD = Japanese Domestic Market 
KAM = Keep Alive Memory 
KDD = Keyboard Display Driver 
kg = Kilogram 
kHz = Kilohertz 
km = Kilometre 
km/h = Kilometres per Hour 
km/l = Kilometres per Litre 
KOEO = Key On Engine Off
KOER = Key on Engine Running
kPa = Kilopascals 
KS = Knock Sensor 
kV = Kilovolts 
L = Litre 
L4 = Four Cylinder Engine, In-line 
L6 = Six Cylinder Engine, In-Line 
lb = Pound 
lb = ft Pound Feet Torque 
lb = in Pound Inch Torque 
LCD = Liquid Crystal Display
LCD = Liquid Crystal Display 
LDCL = Left Door Closed Locking 
LDCM = Left Door Control Module 
LDM = Lamp Driver Module 
LED = Light Emitting Diode 
LED = Light Emitting Diode 
LEV = Low Emissions Vehicle 
LF = Left Front 
lm = Lumens 
LR = Left Rear 
LSD = limited slip differential
LT = Left 
LT = Light 
LT = Long Term 
LTPI = Low Tire Pressure Indicator 
LTPWS = Low Tire Pressure Warning System 
M/C = Mixture Control 
M/T = Manual Transmission/Transaxle 
MAF = mass air-flow sensor
MAF = Mass Airflow 
Man = Manual 
MAP = manifold absolute pressure
MAP = Manifold Absolute Pressure 
MAT = Manifold Absolute Temperature 
max = Maximum 
MDP = Manifold Differential Pressure 
MFI = Multiport Fuel Injection 
mi = Miles 
MIL = malfunction indicator light
MIL = Malfunction Indicator Lamp 
min = Minimum 
MIN = Mobile Identification Number 
ml = Millilitre 
mm = Millimetre 
MPFI = Multiport Fuel Injection
mpg = Miles per Gallon 
mph = Miles per Hour 
MR = Mid Engine, Rear Wheel Drive
ms = Millisecond 
MSRP = Manufacturer's Suggested Retail Price
MST = Manifold Surface Temperature 
MSVA = Magnetic Steering Variable Assist, Magnasteer® 
MV = Megavolt 
mV = Millivolt 
N2O = nitrous
NA = naturally aspirated
NAES = North American Export Sales 
NC = Normally Closed 
NEG = Negative 
Neu = Neutral 
NI = Neutral Idle 
NiMH = Nickel Metal Hydride 
NLGI = National Lubricating Grease Institute 
Nm = Newton-meter Torque 
NO = Normally Open 
NOVRAM = Non-Volatile Random Access Memory 
NOx = Oxides of Nitrogen 
NPTC = National Pipe Thread Coarse 
NPTF = National Pipe Thread Fine 
O/D = Overdrive
O2 = Oxygen 
O2S = Oxygen Sensor 
OBD = On-Board Diagnostics 
OBD = II On-Board Diagnostics Second Generation 
OC = Oxidation Converter Catalytic 
OCS = Opportunity Charge Station 
OD = Outside Diameter 
ODM = Output Drive Module 
ODO = Odometer 
OE = Original Equipment 
OEM = original equipment manufacturer
OEM = Original Equipment Manufacturer
OEM = Original Equipment Manufacturer 
OHC = Overhead Camshaft 
ohms = Ohm 
OL = Open Loop, Out of Limits 
ORC = Oxidation Reduction Converter Catalytic 
ORN = Orange 
ORVR = On-Board Refuelling Vapour Recovery 
OSS = Output Shaft Speed 
oz = Ounce(s) 
P/B = Power Brakes 
P/N = Part Number 
P/S = Power Steering
P/S, = PS Power Steering 
PAG = Polyalkylene Glycol 
PAIR = Pulsed Secondary Air Injection 
PASS, = PSGR Passenger 
PASS-Key® = Personalized Automotive Security System 
PC = Pressure Control 
PCB = Printed Circuit Board 
PCM = Powertrain Control Module 
PCS = Pressure Control Solenoid 
PCV = Positive Crankcase Ventilation
PCV = Positive Crankcase Ventilation 
PEB = Power Electronics Bay 
PFI = Programmable Fuel Injection
PID = Parameter Identification 
PIM = Power Inverter Module 
PM = Permanent Magnet Generator 
PNK = Pink 
PNP = Park/Neutral Position 
POA = Pilot Operated Absolute Valve 
POS = Positive, Position 
POT = Potentiometer Variable Resistor 
PPL = Purple 
ppm = Parts per Million 
PRNDL = Park, Reverse, Neutral, Drive, Low 
PROM = Programmable Read Only Memory 
PSCM = Power Steering Control Module, Passenger Seat Control Module 
PSD = Power Sliding Door 
PSI = pound per square inch
psi = Pounds per Square Inch 
psia = Pounds per Square Inch Absolute 
psig = Pounds per Square Inch Gauge 
PSP = Power Steering Pressure 
pt = Pint 
PTC = Positive Temperature Coefficient 
PWM = Pulse Width Modulated 
QDM = Quad Driver Module 
qt = Quart(s) 
R-134a = Refrigerant-134a 
RAI = ram air intake
RAM = Random Access Memory, Non-permanent memory device, memory contents are lost when power is removed. 
RAP = Retained Accessory Power 
RAV = Remote Activation Verification 
RCDLR = Remote Control Door Lock Receiver 
RDCM = Right Door Control Module 
Ref = Reference 
Rev = Reverse 
REX = Rear Exchanger 
RF = Right Front, Radio Frequency 
RFA = Remote Function Actuation 
RFI = Radio Frequency Interference 
RH = Right Hand 
RHD = right hand drive
RIM = Rear Integration Module 
RKE = Remote Keyless Entry 
Rly = Relay 
ROM = Read Only Memory, Permanent memory device, memory contents are retained when power is removed. 
RPM = Revolutions per Minute Engine Speed 
RPO = Regular Production Option 
RR = Rear Engine, Rear Wheel Drive 
RR = Right Rear 
RRFPR = rising rate fuel pressure regulator
RSS = Road Sensing Suspension 
RT = Right 
RTD = Real Time Damping 
RTV = Room Temperature Vulcanizing Sealer 
RWAL = Rear Wheel Antilock 
RWD = rear wheel drive
RWD = Rear Wheel Drive 
s = Second(s) 
S/C = supercharger
S/P = Series/Parallel 
S4WD = Selectable Four-Wheel Drive 
SAE = Society of Automotive Engineers 
SAFC = Standalone Air/Fuel Controller
SC = Supercharger 
SCB = Supercharger Bypass 
SCM = Seat Control Module 
SDM = Sensing and Diagnostic Module 
SEO = Special Equipment Option 
SES = service engine soon
SFI = Sequential Fuel Injection
SFI = Sequential Multiport Fuel Injection 
SI = System International Modern Version of Metric System 
SIAB = Side Impact Air Bag 
SIR = Supplemental Inflatable Restraint 
SLA = Short/Long Arm Suspension 
SO2 = Sulfur Dioxide 
SOHC = single over head cam
sol = Solenoid 
SP = Splice Pack 
SPO = Service Parts Operations 
SPS = Service Programming System, Speed Signal 
sq = ft, ft² Square Foot/Feet 
sq = in, in² Square Inch/Inches 
SRC = Service Ride Control 
SRI = short ram intake
SRI = Service Reminder Indicator 
SRS = Supplemental Restraint System 
SS = Shift Solenoid 
ST = Scan Tool 
STID = Station Identification Station ID 
STS = short throw shifter
Sw = Switch 
SWPS = Steering Wheel Position Sensor 
syn = Synchronizer 
T/C = turbocharger
TAC = Throttle Actuator Control 
Tach = Tachometer 
TAP = Transmission Adaptive Pressure, Throttle Adaptive Pressure 
TB = throttle body
TBI = Throttle Body Injection
TBI = Throttle Body Fuel Injection 
TC = Turbocharger, Transmission Control 
TCC = Torque Converter Clutch 
TCS = Traction Control System 
TCS = Traction Control System 
TDC = top dead center
TDC = Top Dead Center
TDC = Top Dead Center 
TEMP = Temperature 
Term = Terminal 
TFP = Transmission Fluid Pressure 
TFT = Transmission Fluid Temperature 
THM = Turbo Hydro-Matic 
TIM = Tire Inflation Monitoring, Tire Inflation Module 
TOC = Transmission Oil Cooler 
TP = Throttle Position 
TPA = Terminal Positive Assurance 
TPI = Tuned Port Injection
TPM = Tire Pressure Monitoring, Tire Pressure Monitor 
TPS = Throttle Position Sensor
TR = Transmission Range 
TRANS = Transmission/Transaxle 
TT = Tell Tail Warning Lamp 
TV = Throttle Valve 
TVRS = Television and Radio Suppression 
TVV = Thermal Vacuum Valve 
TWC = Three Way Converter Catalytic 
TWC+OC = Three Way + Oxidation Converter Catalytic 
TXV = Thermal Expansion Valve 
U/H = Underhood 
U/HEC = Underhood Electrical Center 
UART = Universal Asynchronous Receiver Transmitter 
UDP = under drive pulley
U-joint = Universal Joint 
UPP = upper pressure pipe
UTD = Universal Theft Deterrent 
UV = Ultraviolet 
V = Volt(s), Voltage 
V = dif Voltage Difference 
V = ref Voltage Reference 
V6 = Six Cylinder Engine, V-Type 
V8 = Eight Cylinder Engine, V-Type 
Vac = Vacuum 
VAC = Vehicle Access Code 
VATS = Vehicle Anti-Theft System 
VCD = Variable Central Differential 
VCIM = Vehicle Communication Interface Mode 
VCM = Vehicle Control Module 
VDOT = Variable Displacement Orifice Tube 
VDV = Vacuum Delay Valve 
vel = Velocity 
VES = Variable Effort Steering 
VF = Vacuum Fluorescent 
VIN = Vehicle Identification Number 
VIO = Violet 
VLR = Voltage Loop Reserve 
VLSD = Viscous Limited Slip Differential
VMV = Vacuum Modulator Valve 
VR = Voltage Regulator 
VSES = Vehicle Stability Enhancement System 
VSS = Vehicle Speed Sensor 
VTEC = Variable Valve Timing and Lift Electronic Control
VVTi = Variable Valve Timing Intelligence
w/ = With 
W/B = Wheel Base 
w/o = Without 
W/P = Water Pump 
W/S = Windshield 
WAI = warm air intake
WGA = waste gate actuator
WHL = Wheel 
WHP = wheel horse power
WHT = White 
WOT = wide open throttle
WOT = Wide Open Throttle 
WSS = Wheel Speed Sensor 
WU-OC = Warm Up Oxidation Converter Catalytic 
WU-TWC = Warm Up Three-Way Converter Catalytic 
X-valve = Expansion Valve 
yd = Yard(s) 
YEL = Yellow