A

A

Ampere(s)

AC

Alternating Current

ACL

Air Cleaner

A/D

Analog to Digital

A/F

Air/Fuel Ratio

AM/FM

Amplitude Modulation/Frequency Modulation

ANT

Antenna

AP

Accelerator Pedal

API

American Petroleum Institute

APP

Accelerator Pedal Position

ATDC

After Top Dead Center

AUTO

Automatic

AVG

Average

AWG

American Wire Gage

B

B+

Battery Positive Voltage

BARO

Barometric Pressure

BATT

Battery

BHP

Brake Horsepower

BLK

Black

BLU

Blue

BP

Back Pressure

BRN

Brown

BTDC

Before Top Dead Center

BTU

British Thermal Units

C

°C

Degrees Celsius

CAFE

Corporate Average Fuel Economy

CAL

Calibration

CAM

Camshaft

CAN

Controller Area Network

CARB

California Air Resources Board

CCP

CAN Communication Protocol

CEFI

Commercial Electronic Fuel Injection

CM³

Cubic Centimeters

CFM

Cubic Feet per Minute

CG

Center of Gravity

CID

Cubic Inch Displacement

CKP

Crankshaft Position

CKT

Circuit

C/LTR

Cigar Lighter

CL

Closed Loop

CLS

Coolant Level Switch

CMP

Camshaft Position

CO

Carbon Monoxide

CO2

Carbon Dioxide

COAX

Coaxial

COMM

Communication

CONN

Connector

CPA

Connector Position Assurance

CPS

Central Power Supply

CPU

Central Processing Unit

CS

Charging System

CSFI

Central Sequential Fuel Injection

CTP

Closed Throttle Position

CU FT

Cubic Foot/Feet

CU IN

Cubic Inch/Inches

CYL

Cylinder(s)

D

DB

Decibels

DBA

Decibels on A-weighted Scale

DC

Direct Current, Duty Cycle

DE

Drive End

DEC

Digital Electronic Controller

DERM

Diagnostic Energy Reserve Module

DI

Distributor Ignition

DIA

Diameter

DEG

Degrees

DI

Distributor Ignition

DIC

Driver Information Center

DIAG

Diagnostic

DIST

Distributor

DK

Dark

DLC

Data Link Connector

DMM

Digital Multimeter

DOHC

Dual Overhead Camshafts

DR, DRVR

Driver

DTC

Diagnostic Trouble Code

E

EC

Electrical Center, Engine Control

ECL

Engine Coolant Level

ECM

Engine Control Module, Electronic Control Module

ECS

Emission Control System

ECT

Engine Coolant Temperature

EEPROM

Electrically Erasable Programmable Read Only Memory

EI

Electronic Ignition

E/M

English/Metric

EMF

Electromotive Force

EMI

Electromagnetic Interference

Eng

Engine

EOP

Engine Oil Pressure

EOT

Engine Oil Temperature

EPA

Environmental Protection Agency

EPROM

Erasable Programmable Read Only Memory

ESD

Electrostatic Discharge

ESN

Electronic Serial Number

EST

Electronic Spark Timing

E-STOP

Emergency Stop

ETC

Electronic Throttle Control, Electronic Temperature Control, Electronic Timing Control

Exh

Exhaust

F

°F

Degrees Fahrenheit

FC

Fan Control

FED

Federal All United States except California

FEDS

Fuel Enable Data Stream

FI

Fuel Injection

FP

Fuel Pump

ft

Foot/Feet

FT

Fuel Trim

FL

Fuel Level

FMI

Failure Mode Indicator

G

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

GOV

Governor

GPH

Gallons Per Hour

GPM

Gallons per Minute

GRN

Green

GRY

Gray

GVWR

Gross Vehicle Weight Rating

H

H

Hydrogen

H2O

Water

Harn

Harness

HC

Hydrocarbons

H/CMPR

High Compression

hex

Hexagon, Hexadecimal

Hg

Mercury

HI ALT

High Altitude

HO2S

Heated Oxygen Sensor

HP

Horsepower

HPS

High Performance System

HPV

High Pressure Vapor

HTD

Heated

HTR

Heater

HZ

Hertz

I

IAC

Idle Air Control

IAT

Intake Air Temperature

IC

Integrated Circuit, Ignition Control

ICM

Ignition Control Module

ID

Identification, Inside Diameter

IGN

Ignition

IN

Inch/Inches

INJ

Injection, Injector

I/O

Input/Output

IP

Instrument Panel

IPC

Instrument Panel Cluster

I/PEC

Instrument Panel Electrical Center

ISC

Idle Speed Control

ISO

International Standards Organization

ISS

Input Speed Shaft, Input Shaft Speed

K

KAM

Keep Alive Memory

KG

Kilogram

KHZ

Kilohertz

KM

Kilometer

KM/H

Kilometers per Hour

KPA

Kilopascals

KS

Knock Sensor

KV

Kilovolts

L

L

Liter

L4

Four Cylinder Engine, In-Line

LB

Pound

LB/FT

Pound Feet Torque

LB/IN

Pound Inch Torque

LCD

Liquid Crystal Display

LED

Light Emitting Diode

LM

Lumens

LR

Left Rear

LT

Left

LT

Light

LT

Long Term

M

MAF

Mass Air Flow

MAP

Manifold Absolute Pressure

MAT

Manifold Absolute Temperature

MAX

Maximum

M/C

Mixture Control

MDP

Manifold Differential Pressure

MEFI

Marine Electronic Fuel Injection

MFI

Multiport Fuel Injection

MI

Miles

MIL

Malfunction Indicator Lamp

MIN

Minimum

ML

Milliliter

MM

Millimeter

MPH

Miles per Hour

MS

Millisecond

MV

Millivolt

N

NC

Normally Closed

NEG

Negative

NEU

Neutral

NI

Neutral Idle

NLGI

National Lubricating Grease Institute

N·m

Newton-meter Torque

NO

Normally Open

NOx

Oxides of Nitrogen

NPTC

National Pipe Thread Coarse

NPTF

National Pipe Thread Fine

NVRAM

Non-Volatile Random Access Memory

O

O2

Oxygen

O2S

Oxygen Sensor

OBD

On-Board Diagnostics

OBDM

On-Board Diagnostics Marine

OC

Oxidation Converter Catalytic

OD

Outside Diameter

ODM

Output Drive Module

ODO

Odometer

OE

Original Equipment

OEM

Original Equipment Manufacturer

OHC

Overhead Camshaft

Ω

Ohm

OL

Open Loop, Out of Limits

OPT

Optional

ORC

Oxidation Reduction Converter Catalytic

ORN

Orange

OSS

Output Shaft Speed

OZ

Ounce(s)

P

PC

Personal Computer, Pressure Control

PCB

Printed Circuit Board

PCM

Powertrain Control Module

PCS

Pressure Control Solenoid

PCV

Positive Crankcase Ventilation

PFI

Port Fuel Injection

PID

Parameter Identification

P/N

Part Number

PNK

Pink

PNP

Park/Neutral Position

POS

Positive, Position

POT

Potentiometer Variable Resistor

PPL

Purple

PPM

Parts per Million

PPS

Pedal Position Sensor

PROM

Programmable Read Only Memory

PRNDL

Park, Reverse, Neutral, Drive, Low

P/S, PS

Power Steering

PSP

Power Steering Pressure

PSI

Pounds per Square Inch

PSIA

Pounds per Square Inch Absolute

PSIG

Pounds per Square Inch Gauge

PT

Pint

PTC

Positive Temperature Coefficient

PWM

Pulse Width Modulated

Q

QDM

Quad Driver Module

QT

Quart(s)

R

RAM

Random Access Memory, Non-permanent memory device, memory contents are lost when power is removed.

REF

Reference

RH

Right Hand

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

Right Rear

RT

Right

S

S

Second(s)

SAE

Society of Automotive Engineers

SC

Supercharger

SCB

Supercharger Bypass

SFI

Sequential Multiport Fuel Injection

SLV

Slave

SOL

Solenoid

SO2

Sulfur Dioxide

SP

Splice Pack

S/P

Series/Parallel

SPN

Suspect Parameter Number

SPO

Service Parts Operations

SPS

Service Programming System, Speed Signal

SQ FT, FT²

Square Foot/Feet

SQ IN, IN²

Square Inch/Inches

SRI

Service Reminder Indicator

ST

Scan Tool

SW

Switch

SYN

Synchronizer

T

TAC

Throttle Actuator Control

TACH

Tachometer

TBI

Throttle Body Fuel Injection

TC

Turbocharger, Transmission Control

TDC

Top Dead Center

TEMP

Temperature

TERM

Terminal

TP

Throttle Position

TPA

Terminal Positive Assurance

TPS

Throttle Position Sensor

TSC

Throttle Shift Control

TT

Tell Tail Warning Lamp

TV

Throttle Valve

TWC

Three Way Converter Catalytic

TWC+OC

Three Way + Oxidation Converter Catalytic

U

UART

Universal Asynchronous Receiver Transmitter

U-joint

Universal Joint

UV

Ultraviolet

V

V

Volt(s), Voltage

V6

Six-Cylinder Engine, V-Type

V8

Eight-Cylinder Engine, V-Type

VAC

Vacuum

VIO

Violet

VIN

Vehicle Identification Number

VR

Voltage Regulator

V REF

Voltage Reference

VSS

Vehicle Speed Sensor

W

W/

With

WHT

White

W/O

Without

WOT

Wide Open Throttle

W/P

Water Pump

W/S

Windshield

Y

YD

Yard(s)

YEL

Yellow