Abbreviations General EFI

[D. Barry Stubbs]

The compiled list, as best I can make out.  Please let me know if I
garbled or left anything off:

A/F  Air fuel Ratio
A/C  Air conditioning
ABDC  After Bottom Dead Center
ABS  Anti-Lock Braking System
AC  Alternating Current
AE  Acceleration Enrichment
AFR  Air Fuel Ratio
AIR  Air Injection Reaction
AIT  Air Intake Temp
ALCL  Assembly line communications link
ALDL  Assembly Line Diagnostic Link
Async  Fuel delivery Asynchronous to engine timing
AT  Automatic Transmission
ATDC  After Top Dead Center
AWG  American Wire Gauge
Baro  Barometric Pressure
BBDC  Before Bottom Dead Center
BCM  Body Control Module
BLM  Block Learn Multiplier
bpw  base pulse width
BTU  British Thermal Units
C  Celsius
C/L  Closed Loop
C3   GM ECM using  Motorola 68xx-like processor  (1+ MHz CPU)
CCP  Controlled Canister Purge
CID   Cubic Inch Displacement
CKP  crankshaft position sensor
CMP  camshaft position sensor
CP  Canister Purge
CPU  Central Processor Unit  (the brains in the ecm)
CTS  Coolant Temp Sensor
DB  Decibels
DC  Duty Cycle On time, compared to total event time expressed as a
percent
DC  Direct Current
DE  Decel Enleanment
DFCO  Decleration Fuel Cut Off
DIS  Distributorless Ignition System
DVM  Digital Multi Meter
ECM  Engine Control Module
ECT  engine coolant temp
ECU  Engine Control Unit
EFI  Electronic Fuel Injection
EGR  Exhaust Gas Recirculation
EGT  Exhaust Gas Temp
EPROM  Erasable Programable Read Only Memory
ESC  Electronic Spark Control (Knock Control)
EST  Electronic Spark Timing
F  Fahrenheit
FED  Federal (emissions package)
GPS  Grams per sec
hego  heated exhaust gas oxygen
HEI  High Energy Ignition
HO2S  heated o2 sensor
I/O  Input/Output
IAC  Idle Air Control
IAT  Intake Air Temp
IC  Integrated Circuit
ICE  Internal Combustion engine
IGN  Ignition
Injector On Time  Time in milliseconds that an injector is on.
INT  Integrator
IPW  Injector Pulse Width
IS   Idle Speed
ISC  Idle Speed Control
kapwr  keep alive power
kg  Kilogram
Kilohertz  (1,000s cycles / sec)
kPa  Kilopascals (Pressure)
KS  Knock Sensor
L  Liter (about 60 cubic inches)
LCD  Liquid Crystal Display
MAF  Mass Air Flow
MAP  Manifold Absolute Pressure
MAT  Manifold Air Temp
MDP  Manifold differential Pressure
MEMCAL  Memory Calibration Unit
MFI  Multi-port Injection
MIL  malfunction indicator lamp
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 exhaust mixtures, GM so far uses this
type, and it has a high slew rate and therefore is more of a switch
OBD2  on board diagnostics, newer vehicle electronics, less friendly
OL   Open Loop
OTS  Oil Temp Sensor
P/N  park neutral switch
P+H  one way of firing an injector High initial voltage to open then
lower to keep it open
P4  GM ECM using early Motorola 68HCxx-like processor  (2+ MHz CPU)
PCM  Powertrain Control Module (engine and trans control)
PE  Power Enrichment
Port,  MPFI, Multi Port, each cyl has it's own injector close to the
intake valve
PS  Power steering
PSI  Pounds per square inch
PSIA  PSI absolute
PSIG  PSI Gauge
PW  Pulse Width
PWM  Pulse Width Modulation
QT  Quart
R-12  Refrigerant
RAM  Random Access Memory
RAP  Retained Accessory Power
RFI  Radio Frequency Interference
ROM  Read Only Memory
RR  Right Rear
RTV  Room Temperature Vulcanizing
RWD  Rear wheel drive
SEFI  Sequential Electronic Fuel Injection
SES  Service Engine Soon (Light)
SI  Saturated Injector *constant* voltage current
SynchPulse  Fuel PW with delivery tied to timing of ref pulses
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
TFT  trans fluid temp
TH  Turbo-Hydramatic
TPI  Tuned Port Injection
TPS  Throttle Position Sensor
TRC  Throttle Return Control
TTS  Trans Temp Sensor
TV  Throttle Valve
TVS  Thermal Vacuum Switch
VATS  Vehicle Anti Theft System
VE  Volumetric Efficiency
VSS  Vehicle Speed Sensor
WBO2  this sensor differs from the O2 in so far that it is designed for
a *linear* output
WG  WasteGate
WOT  Wide Open Throttle
 

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D. Barry Stubbs                                    http://surf.to/z24man
(912) 745-9429                                     AOL IM: thez24man
z24man at earthlink.net          BNet Member #828     ICQ #5409648
#101DSP MidGa Region SoloII   94 Q4 5spd Aqua Z26  88 2.8 5Spd White Z24
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