justlearning

okay i tried to come up w/ a idea for deffining all the flags, tables, constants etc. to make a sticky about a week ago. but the more reading i do the more i realize how in depth some of it would have to go which would take much time and space, and even some gurus have trouble getting some parts. so i decided to go this route instead these are deffinitions for abb. i have run across while studing articles and stickies trying to learn how to tune (since im a total newb) feel free to add more or deffine the few i left blank and i will edit this regularly. thanks
John

SA = spark advance
wot = wide open throttle
PE = power enrichment
Map = Manifold absolute pressure
esc = electronic spark control
est = electronic spark timing
vss = vehicle speed sensor
tdc = top dead center
btdc = before top dead center
atdc = after top dead center
aldl = assembly line diagnostic link
IAT = intake air temp.
IAC = idle air control
TPS = throttle position sensor
BLM = block learn multiplier (long term fuel trim)
tsa = total spark advance
K/S = knock sensor
DFCO = deceleration fuel cut off
C/L or CL = closed loop
O/L or OL = open loop
Egr = exaust gas recirculation
TCC = torque convertor clutch
AE = acceleration enrichment
VE = volumetric efficency
Kpa = kilo-pascals (metric measure of pressure for map)
DE = deceleration enleanment
AFR = air to fuel ratio
PCV = possitive crankcase ventilation
Baro = biometric pressure
CCP = charcoal canister purge
INT = integrator (short term fuel trim)
bpw = base pulse width
bpc = base pulse constant
msec = milli second .001 seconds
usec = micro second .000001 seconds
nsec = nano second .000000001 seconds
pph = pounds per hour
gps = grams per second
bsfc = brake specific fuel consumption
DC = Duty Cycle
mat = manifold air temperature
adc = analog to digital conversion?
s/d map = speed density map?
VATS = vehicle anti-theft system
mvdc = milli volts dc
TF = throttle follower
~T = inverse temperature?
~AFR = inverse afr?
CLT = closed loop correction term

since im a newb somthing like this is probably the biggest contribution i can make right to the prom board but its worth it cause im sure it may help at least one person.

RBob

iTrader: (1)

It's been stickied (not even a word, but it works, ).

Any one have more to add, please do so.

RBob.

Bones232

Here are a couple more...

bpw = base pulse width
bpc = base pulse constant
msec = milli second .001 seconds
usec = micro second .000001 seconds
nsec = nano second .000000001 seconds
pph = pounds per hour
gps = grams per second
bsfc = brake specific fuel consumption
DC = Duty Cycle
mat = manifold air temperature
adc = analog to digital conversion?
s/d map = speed density map?
VATS = vehicle anti-theft system
mvdc = milli volts dc
TF = throttle follower
~T = inverse temperature?
~AFR = inverse afr?
CLT = closed loop correction term

justlearning

ill add those thanks keep em comming this may turn out alot better than i thought

Bones232

Anybody know what 'hyst' stands for? I've seen it around quite a bit but have never seen a definition...

Dave_Jones

You might find a few more here:

http://www.diy-efi.org/gmecm/faq/biglist.txt

Also, "hyst" = hysteresis.

Craig Moates

I know it's a bit off topic, but I have a favorite:

TLA = three-letter acronym

JPrevost

A/C Air Conditioning
A/D Analog to Digital
ABS Anti-Lock Brake System
ADC Analog to Digital Converter
AE Acceleration Enrichment
Aero Aerodynamic(s)
AFCO All Fuel Cut Off
AFPR Adjustable FPR
AFR Air Fuel Ration
ALDL Assembly Line Diagnostic Link
ALPHA-N Form of EFI
BBC Big Block Chevy
BDC Bottom Dead Center
BIN Binary
BLM Block Learn Multiplier
BP Barometric Pressure
BPW Base Pulse Width
CAFÉ Corporate Average Fuel Economy
CAN Controller Area Network
CARB Carburetor. (Also California Air Resources Board)
CAT Catalytic Converter
CC Combustion Chamber
CCC Computer Controlled CARB
CDI Capacitive Discharge Ignition
CE Check Engine
CFI CrossFire Injection
CL Closed Loop
CNP Coil Near Plug
CPU Central Processing Unit
CTS Coolant Temp Sensor
DAC Digital Analog Converter
DC Duty Cycle
DE Deceleration Enleanment
DFCO Deceleration Fuel Cut-Off
DIY Do It Yourself
ECM Engine Control Module
ECT Engine Coolant Temperature
ECU Electronic Control Unit
EEPROM Electronically EPROM
EFI Electronic Fuel Injection
EGO Exhaust Gas Oxygen
EGR Exhaust Gas Recirculation
EGT Exhaust Gas Temperature
EPROM Erasable PROM
ESC Electronic Spark Control
EST Electronic Spark Timing
F/A or A/F Fuel-Air Ratio
FEEPROM Flash EEPROM
FP Fuel Pump
FPR Fuel Pressure Regulator
GM General Motors
GN Grand National
HEGO Heated EGO
HEI Heigh Energy Ignition
HW HighWay
IAC Idle Air Control or Intake Air Control
IAT Intake Air Temp
IC Injector Constant
INT Integrator
KS Knock Sensor
Lean AFR greater than Stoich
LT Long Tubes
LTC Long Term Correction
MAF Mass Air Flow
MAP Manifold Absolute Pressure or Manifold Air Pressure
MAT Manifold Air Temperature
MIL Malfunction Indicator Lamp
MPFI MultiPort Fuel Injection
NB Narrow Band
NETRES Network of Resistors
O2 Oxygen
OBD-I On-Board Diagnostics pre-95
OBD-II On-Board Diagnostics post-95 pre CAN
OEM Original Equipment Manufacturer
OL Open Loop
PA3 Peripheral Address # but with GM it's the Knock Counter
PCM Powertrain Control Module
PE Power Enrichment
PFI Port Fuel Injection
PIC Programmable Integrated Circuit
PROM Programmable ROM
PW Pulse Width
PWM Pulse Width Modulated
RESNET Resistor Network
Rich AFR less than Stoich
ROM Read Only Memory
SA Spark Advance
SAE Society of Automotive Engineers
SBC Small Block Chevy
SD Speed Density
SES Service Engine Soon
SFI Sequential multiport Fuel Injection
STC Short Term Correction
Stoich Stoichiometry
TBI Throttle Body Injection
TCC Torque Converter Clutch
TDC Top Dead Center
TDC Top Dead Center
TGO ThirdGen.Org
TPI Tuned Port Intake
TPS Throttle Position Sensor
VAFPR Vacuum referenced ADFP
VE Volumetric Efficiency
VS Vehicle Speed
VSS Vehicle Speed Sensor
WB Wide Band
WOT Wide Open Throttle

Ronny

iTrader: (1)

SO=show off.

zapeee

you guys left out a couple that we all use at some point in learning how to tune:

SNAFU- Situation Normal All Fouled Up
FUBAR- Fouled up Beyond All Repair

maybe "fouled" isnt quite strong enough...

RJMcEachern

old thread but i thought of a couple ones that come to mind often at work

RTFM = read the f'ing manual
ID10T error condition

RJMcEachern