A: Ampere

AAT: Ambient Air Temperature

ABS: Antilock Brake System

AC: Alternating Current

ACI: Air Cleaner

Adj: Adjust

A/F: Air Fuel Ratio

AIR: Secondary Air Injection

Alt: Altitude

Ant: Antenna

AP: Accelerator Pedal

Asm: Assembly

AT: Automatic Transmission or Automatic Transaxle

ATDC: After Top Dead Center

Auto: Automatic

BARO: Barometric Pressure

Bat: Battery

B+: Battery Positive Voltage

BP: Back Pressure

BLK: Black

BLU: Blue

BPP: Brake Pedal Position

BTDC: Before Top Dead Center

C: Celsius

CARB: California Air Resources Board

CAC: Charge Air Cooler

Calif: California

CCOT: Cycling Clutch Orifice Tube

CD ROM: Compact Disc Read Only Memory

CE: Commutator End

CFI: Continuous Fuel Injection

CID: Cubic Inch Displacement

CKP: Crankshaft Position

CKT: Circuit

CL: Closed Loop

CMP: Camshaft Position

CNG: Compressed Natural Gas

CO: Carbon Monoxide

Coax: Coaxial

Conn: Connector

Conv: Converter

CPI: Central Port Fuel Injection

CPP: Clutch Pedal Position

CPS: Central Power Supply

Crank: Crankshaft

CTP: Closed Throttle Position

CV: Constant Velocity

CVS: Constant Volume Sampler

Cyl: Cylinder(s)

DC: Direct Current

DE: Drive End

DFI: Direct Fuel Injection

Diff: Differential

DI: Distributor Ignition

Dist: Distributor

DK: Dark

DLC: Data Link Connector

DTC: Diagnostic Trouble Code

DTM: Diagnostic Test Mode

DVM: Digital Voltmeter

EAC: Electric Air Control

EC: Engine Control

ECL: Engine Coolant Level

ECT: Engine Coolant Temperature

EEPROM: Electronically Erasable Programmable Read Only Memory

EGR: Exhaust Gas Recirculation

EI: Electronic Ignition

EM: Engine Modification

EOP: Engine Oil Pressure

EOT: Engine Oil Temperature

EP: Exhaust Pressure

EPROM: Erasable Programmable Read Only Memory

ESC: Electronic Spark Control

ESD: Electrostatic Discharge

ETR: Electronically Tuned Receiver

EVAP: Evaporative Emission

Exh: Exhaust

4-WAL: Four Wheel Antilock Brakes

F: Fahrenheit

F4WD: Full Time Four Wheel Drive

FC: Fan Control

FED: Federal (All States Except Calif.)

FP: Fuel Pump

FT: Fuel Trim

FF: Flexible Fuel

FWD: Front Wheel Drive

Gal: Gallon

GEN: Generator

Gov: Governor

g: Gram

GND: Ground

GRN: Green

GRY: Grey

Harn: Harness

HC: Hydrocarbons

HD: Heavy Duty

Hg: Mercury

HiAlt: High Altitude

HO2S: Heated Oxygen Sensor

IAC: Idle Air Control

IAT: Intake Air Temperature

IC: Ignition Control

ICM: Ignition Control Module

ID: Identification or Inside Diameter

IFI: Indirect Fuel Injection

Ign: Ignition

I/M: Inspection and Maintenance

IMPC: Intake Manifold Runner Control

Inter: Intermediate

Inj: Injection

IP: Instrument Panel

IPC: Instrument Panel Cluster

INT: Intake

ISC: Idle Speed Control

ISS: Input Shaft Speed

km: Kilometer

km/h: Kilometer per hour

kPa: Kilopascals

KS: Knock Sensor

kV: Kilovolts (thousands of volts)

L: Liter

LF: Left Front

LH: Left Hand

LR: Left Rear

LS: Left Side

LT: Light

L4: Four Cylinder In-Line Engine

MAF: Mass Air Flow

Man: Manual

MAP: Manifold Absolute Pressure

MAT: Manifold Absolute Temperature

Max: Maximum

MC: Mixture Control

MDP: Manifold Differential Pressure

MFI: Multiport Fuel Injection

MIL: Malfunction Indicator Lamp

Min: Minimum

ml: Milliliter

mm: millimeter

MPG: Miles Per Gallon

MPH: Miles Per Hour

MST: Manifold Surface Temperature

mV: MilliVolt

NC: Normally Closed

N·m: Newton Meters

NO: Normally Open

NOx: Nitrogen, Oxides of

NVRAM: Non-Volatile Random Access Memory

O2: Oxygen

O2S: Oxygen Sensor

OBD: On Board Diagnostic (level 1)

OBD II: On Board Diagnostic (level 2)

OC: Oxidation Catalytic Converter

OD: Outside Diameter

OL: Open Loop

ORN: Orange

OSS: Output Shaft Speed

PAIR: Pulsed Secondary Air Injection

P/B: Power Brakes

PC: Pressure Control

PCM: Powertrain Control Module

PCV: Positive Crankcase Ventilation

PNK: Pink

PNP: Park/Neutral Position

PPL: Purple

PRESS: Pressure

PROM: Programmable Read Only Memory

PS: Power Steering

PSP: Power Steering Pressure

psi: Pounds Per Square Inch

Pt: Pint

PWM: Pulse Width Modulation

Qt: Quart

RAM: Random Access Memory

Ref: Reference

Rev: Reverse

RF: Right Front

RFI: Radio Frequency Interference

RH: Right Hand

ROM: Read Only Memory

RPM: Revolutions Per Minute

RPO: Regular Production Option

RR: Right Rear

RS: Right Side

TRV: Room Temperature Vulcanizing

RVR: Response Vacuum Reducer

RWAL: Rear Wheel Antilock Brakes

RWD: Rear Wheel Drive

S4WD: Selectable Four Wheel Drive

SAE: Society of Automotive Engineering

Sec: Secondary

SFI: Sequential Multiport Fuel Injection

SI: System International

Sol: Solenoid

Speedo: Speedometer

SRI: Service Reminder Indicator

SRT: Service Reminder Test

SS: Shift Solenoid

STRG: Steering

ST: Scan Tool

Syn: Synchronize

Sys: System

TAC: Thermostatic Air Cleaner

TAC: Throttle Actuator Control

Tach: Tachometer

TB: Throttle Body

TBI: Throttle Body Fuel Injection

TC: Turbocharger

TCC: Torque Converter Clutch

TDC: Top Dead Center

TFP: Transmission Fluid Pressure

TFT: Transmission Fluid Temperature

Term: Terminal

Temp: Temperature

TP: Throttle Position

TR: Transmission Range

TRANS: Transmission

TV: Throttle Valve

TVRS: Television and Radio Suppression

TVV: Thermal Vacuum Valve

TWC: Three Way Catalytic Converter

TWC+OC: Three Way Catalytic Converter + Oxidation Catalytic Converter

TXV: Thermostatic Expansion Valve

U-Joint: Universal Joint

V: Volts

Vac: Vacuum

VCM: Vehicle Control Module

VDOT: Variable Displacement Orifice Tube

VF: Vacuum Fluorescent

VIN: Vehicle Identification Number

VR: Voltage Regulator

V-ref: ECM Reference Group

VRV: Vacuum Reducer Valve

VSS: Vehicle Speed Sensor

V6: Six Cylinder "V" Engine

w/: With

WHT: White

WHL: Wheel

w/b: Wheel Base

w/o: without

WOT: Wide Open Throttle

WU-OC: Warmup Oxidation Catalytic Converter

WU-TWC: Warmup Three Way Catalytic Converter

WP: Water Pump

YEL: Yellow