Re: Abbrviations General EFI

["Bruce Plecan" <nacelp@bright.net>]

Any Additions?.
Other wise it's to FAQ
Grumpy


Abbreviations, that are used in general ecm conversations

ABDC  After Bottom Dead Center
ABS  Anti skid Braking
AC  Alternating Current
A/C  Air conditioning
AE  Accleration Enrichment
A/F  Air fuel Ratio
AFR Air Fuel Ratio
AIT  Air Intake Temp
AIR  Air Injection Reaction
ALCL  Assembly line communications link
ALDL  Asembly Line Diagnostiv Line
AT  Automatic Transmission
ATDC  After Top Dead Center
AWG  American Wire Guage

Baro  Barometric Pressure
BBDC  Before Bottom Dead Center
BTU  British Thermal Units

C  Celsius
CCP  Controlled Canister Purge
CID   Cubic Inch Displacement
C/L  Closed Loop
CP  Canister Purge
CPU  Central Processor Unit  (the brains in the ecm)
CTS  Coolant Temp Sensor

DB  Decibels
DC  Direct Current
DC  Duty Cycle On time, compared to total event time expressed as a percent
DFCO  Decleration Fuel Cut Off
DIS  Distributorless Ignition System
DVM  Digitial Multi Meter

ECM  Engine Control Module
ECU   Engine Control Unit
EFI Elecronic Fuel Injection
EGR  Exhuast Gas Recirculation
EGT  Exhuast Gas Temp
EPROM  Erasable Programable Read Only Memory
ESC  Electronic Spark Control (Knock Control)
EST  Electronic Spark Timing

F  Fahrenheit
FED Federal (emissions package)

HEI  High Energy Ignition

IAC  Idle AIr Control
IC  Integrated Circuit
ICE  Internal Combustion engine
Injector On Time  Time in milliseconds that an injector is on
ISC  Idle Speed Control

KS  Knock Sensor

MAF  Mass Air Flow
MAP   Manifold Absolete Pressure
MAT  Manifold Air Temp
kg  Kilogram
Kilohertz (1,000s cycles / sec)
kPa  Kilopascals (Pressure)

L  Liter (about 60 cubic inches)
LCD  Liquid Crystal Display

MAP  Manifold Absolute Pressure
MAT  Manifold Ait Temp
MDP  Manifold differential Pressure
MEMCAL  Memory Calibration Unit
MFI  Multi-port Injection
MT  Manual Transmission

NC  Normally Closed
NEU  Neutral
NO  Normally Open
NPTC  National Pipe thread Course
NTPF  National Pipe Thread Fine

O2  Sensor for detecting rich lean exhuast mixtures, gm so far uses this
type, and it has a high slew rate and therfore is more of a swich
OTS  Oil Temp Sensor

RAM  Randon Access Memory
ROM  Read Only Memory

P+H  one way of firing an injector High initial voltage to open then a lower
to keep it open
PCM Powertrain Control Module (engine and trans control)
PE  Power Enrichment
Port,  MPFI, Multi Port, each cyl has it's own injector close to intake
valve
PS Power steering
PSI  Pounds per square inch
PSIA PSI absolute
PSIG PSI Guage
PWM Pulse Width Modulation

QT  Quart

R-12 Refrigerant
RAM  Random Access Memory
RAP  Retained Accessory Power
RFI  Radio Frequency Interference
RR  Right Rear
RTV Room Temperature Vulconizing
RWD  Rear wheel crive

SES  Service Engine Soon (Light)

TAC  Thermostatic Air Cleaner
TB  Throttle Body
TBI  Injection system where the injectors are mounted above the butterflies
TCC  Torque Converter Clutch
TCM  Transmission Control Module
TDC  Top Dead Center
TH  Turbo-Hydramatic
TPS  Throttle Posistion Sensor
TRC  Throttle Return Control
TV  Throttle Valve
TVS  Thermal Vacuum Switch

SEFI  Sequential Electronic Fuel Injection
SI  Saturated Injector *constant* voltage current

VATS  Vehicle Anti Theft System
VSS  Vehicle Speed Sensor

WB O2 this sensor differs from the O2 in so far that it is designed for a
*linear* ouput
WOT  Wide Open Throttle


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