Abbrviations General EFI

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

FAQ again
Abbreviations, that are used in general ecm conversations



ABS  Anti skid Braking
AE  Accleration Enrichment
AIT  Air Intake Temp

CPU  Central Processor Unit  (the brains in the ecm)
CTS  Coolant Temp Sensor

DC  Duty Cycle On time, compared to total event time expressed as a percent
DFCO  Decleration Fuel Cut Off
DIS  Distributorless Ignition System

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
HEI  High Energy Ignition

Injector On Time  Time in milliseconds that an injector is on.

MAF  Mass Air Flow
MAP   Manifold Absolete Pressure
MAT  Manifold Air Temp

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

TBI  Injection system where the injectors are mounted above the butterflies
TCC  Torque Converter Clutch
TCM  Transmission Control Module
TPS  Throttle Posistion Sensor

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

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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