Abbreviation

Definition

A/C

Air Conditioning

ACCS

A/C Cycling Switch

ACC

A/C Clutch Compressor

ACD

Air Conditioning Demand

ACON

A/C ON

ACP

Air Conditioning Pressure

ACT

Air Charge Temperature sensor

ACV

Thermactor Air Control Valve

ADC

Analog to Digital Converter

ADJ

Adjust

A/D

Analog to Digital

A/F

Air to Fuel Ratio

AFR

Air to Fuel Ratio

AIR

Secondary Air Injection / Thermactor

AIRB

Secondary Air injection Bypass

AIRD

Secondary Air injection Diverter

ALDL

Assembly Line Diagnostic Link

ALT

Alternator

AM1

Thermactor Air Bypass Tandem solenoid valves

AM2

Thermactor Air Diverter Tandem solenoid valves

AOD

Automatic Overdrive transmission

AODE

Automatic Overdrive Electronic transmission

AODE-W

Automatic Overdrive Electronic Wide-ratio transmission

ARC

Automatic Ride Control

A/T

Automatic Transmission/Transaxle

ATDC

After Top Dead Center

AXOD

Automatic Transaxle Overdrive

AVOM

Analog Volt-Ohm Meter

B+

Battery Positive Voltage

BATT+

Battery Positive Voltage

BARO

Barometric Pressure

BDC

Bottom Dead Center

BLR

Blower

BOO

Brake On/Off switch

BP

Barometric Pressure sensor

BPA

Bypass Air

BTDC

Before Top Dead Center

CAC

Charge Air Cooler (intercooler)

CANP

Canister Purge solenoid

CBD

Closed Bowl Distributor

CCC

Converter Clutch Control

CCD

Computer Controlled Dwell

CCO

Converter Clutch Override

CCRM

Constant Control Relay Module

CCS

Coast Clutch Solenoid

CEL

Check Engine Light

CFI

Central Fuel Injection

CID

Cylinder Identification sensor

CKP

Crankshaft Position

CKT

Circuit

CMP

Camshaft Position

CO

Carbon Monoxide

CO2

Carbon Dioxide

CPP

Clutch Pedal Position

CPS

Crankshaft Position Sensor

CSE GND

Case Ground

CTS

Coolant Temp Sensor

DAC

Digital to Analog Converter

DI

Distributor Ignition

DIS

Distributorless Ignition System

DLC

Data Link Connector

DOHC

Dual Overhead Cam

DOL

Data Output Line

DPFE

Delta Pressure Feedback EGR

DPDIS

Dual Plug Distributorless Ignition System

DPI

Dual Plug Inhibitor

DTC

Diagnostic Trouble Code

DTM

Diagnostic Test Mode

DVOM

Digital Volt/Ohm Meter

E4OD

Electronic 4-Speed Overdrive

EAIR

Electronic Secondary Air Injection

EAP

Electronic Air Pump

ECA

Electronic Control Assembly

EEC

Electronic Engine Control

EEC-IV

Ford's fourth generation EEC system

ECM

Electronic Control Module

ECT

Engine Coolant Temperature sensor

ECU

Electronic Control Unit

EDF

Electric Drive Fan relay assembly

EDIS

Electronic Distributorless Ignition System

EED

Electronic Engine Control

EFI

Electronic Fuel Injection

EGO

Exhaust Gas Oxygen sensor

EGR

Exhaust Gas Recirculation system

EGRC

EGR Vacuum Control solenoid

EGRV

EGR Vent solenoid or system

EGT

Exhaust Gas Temperature

EI

Electronic Ignition

EPC

Electronic Pressure Control

EPT

EGR Pressure Transducer

ER

Engine Running

EVP

EGR Position sensor

EVR

EGR Valve Regulator

FC

Fan Control

FF

Flexible Fuel

FFS

Flexible Fuel Sensor

FFV

Flexible Fuel Vehicle

FI

Fuel Injector or Fuel Injection

FMEM

Failure Mode Effects Management

FP

Fuel Pump

FPM

Fuel Pump Monitor

FPR

Fuel Pressure Regulator

FPRC

Fuel Pressure Regulator Control

FTO

Filtered Tach Output

GCM

Governor Control Module

GEN

Generator / Alternator

GND

Ground

GRND

Ground

GVW

Gross Vehicle Weight

HC

Hydrocarbon

HEDF

High Speed Electro Drive Fan

HEGO

Heated EGO sensor

HEGO G

HEGO Ground circuit

HFC

High Fan Control

HFP

High Fuel Pump

HLOS

Hardware Limited Operating Strategy

HSIA

High Speed Inlet Air

HO

High Output

HSC

High Swirl Combustion

IAB

Idle Air Bypass

IAC

Idle Air Control

IAS

Idle Air Soleniod

ICM

Ignition Control Module

IDM

Ignition Diagnostic Monitor

IFS

Inertia Fuel Shutoff Switch

IGN

Ignition system or circuit

IGN GND

Ignition Ground

IMRC

Intake Manifold Runner Control

INJ

Injector or Injection

IS

Inertia Switch (fuel cutoff)

ISC

Idle Speed Control

ITS

Idle Tracking Switch

KAM

Keep Alive Memory

KAPWR

Keep Alive Power

KOEO

Key On Engine Off

KOER

Key On Engine Running

KS

Knock Sensor

L

Liter(s)

LFC

Low Fan Control

LFP

Low Fuel Pump

LOS

Limited Operation Strategy

LUS

Lock-Up Solenoid

MAF

Mass Air Flow sensor, meter or circuit

MAF RTN

Mass Air Flow Return

MAP

Manifold Absolute Pressure

MA PFI

Mass Air Sequential Port Fuel Injection system

MAPPA

Manifold Absolute Pressure Per Altitude

MAT

Manifold Air Temp sensor

MCU

Microprocessor Control Unit

MECS

Mazda Engine Control System

MFI

Multiport Fuel Injection

MIL

Malfunction Indicator Light

MLP

Manual Lever Position

MLUS

Modulated Lock-Up Solenoid

MPFI

Multi Port Fuel Injection

NC

Normally Closed

NDS

Neutral Drive Switch

NGS

Neutral Gear Switch

NPS

Neutral Pressure Switch

NO

Normally Open

NOx

Nitrous Oxides

NOS

Nitrous Oxides

O2S

Oxygen Sensor

OBD

On Board Diagnostics

OCC

Output Circuit Check

OCT

Octane

OCT ADJ

Octane Adjust

OHC

Over Head Camshaft (engine type)

OSC

Output State Check

PA

Pulsed Air Injection

PAIR

Pulsed Secondary Air Injection

PCM

Powertrain Control Module

PCV

Positive Crankcase Ventilation

PFE

Pressure Feedback EGR sensor or circuit

PFI

Port Fuel Injection

PIP

Profile Ignition Pickup

PLCC

Plastic Leadless Chip Carrier

PNP

Park / Neutral Position

PSP

Power Steering Pressure

PSPS

Power Steering Pressure Switch

PSOM

Programmable Speedometer/Odometer Module

PWM

Pulse Width Modulated

PWR

Power

PWR GND

Power Ground circuit

RABS

Rear Antilock Brake System

RM

Relay Module

RPM

Revolutions Per Minute

RTN

Return

RWD

Rear Wheel Drive

SAW

Spark Angle Word

SBC

Small Block Chevy

SC

Super Charged (engine type)

SD

Speed-Density

SEFI

Sequential Electronic Fuel Injection

SFI

Sequential Fuel Injection

SIG

Signal

SIG RTN

Signal Return circuit

SIL

 Shift Indicator Light

SHO

Super High Output

SPFI

Sequential Port Fuel Injection

SPOUT

Spark Output Signal from EEC

SS

Shift Solenoid circuit

STAR

Self Test Automatic Readout (test equipment)

ST

Scan Tool

ST

Self Test

STI

Self Test Input circuit

STO

Self Test Output circuit

TACH

Tachometer

TAB

Thermactor Air Bypass Tandem solenoid valves

TAD

Thermactor Air Diverter Tandem solenoid valves

TB

Throttle Body

TBI

Throttle Body Injection

TC

Turbocharger

TCC

Torque Converter Clutch

TCIL

Transmission Control Indicator Lamp

TCM

Transmission Control Module

TCS

Transmission Control Switch

TDC

Top Dead Center

TFI

Thick Film Ignition system

TGS

Top Gear Switch

THS

Transmission Hydraulic Switch

TOT

Transmossion Oil Temperature

TP

Throttle Position Sensor

TPI

Tuned Port Intake

TPOUT

Throttle Position Output

TPS

Throttle Position Sensor

TRD

Transmission Range Drive

TROD

Transmission Range Overdrive

TRL

Transmission Range Low

TRR

Transmission Range Reverse

TSS

Transmission Speed Sensor

TTS

Transmission Temperature Switch

VAF

Vane Air Flow sensor or circuit

VAF

Volume Air Flow

VAT

Vane Air Temperature

VBATT

Vehicle Battery Voltage

VCRM

Variable Control Relay Module

VECI

Vehicle Emission Control Information Label

VM

Vane Meter

VOM

Analog Volt/Ohm Meter

VCRM

Variable Control Relay Module

VPWR

Vehicle Power supply voltage (regulated 10-14 volts)

VR

Variable Reluctance

VREF

Voltage Reference (ECA supplied reference voltage 4-6 volts)

VRS

Variable Reluctance Sensor

VSC

Vehicle Speed Control sensor or signal

VSS

Vehicle Speed Sensor or signal

WAC

WOT A/C Cut-off switch or circuit

WOT

Wide Open Throttle