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ALDL EFI Acronyms and Abbreviations Defined
Quote:
Originally Posted by
EagleMark
Right here is open to any EFI documents!
Here is list and a pdf file with common acronyms and abbreviations used in conjunction with ECM writings.
#/Hr - Pounds per Hour or PPH
A/C - Air conditioning
A/D - Analog to Digital
A/F - Air fuel Ratio
ABDC - After Bottom Dead Center
ABS - Anti-Lock Braking System
AC - Alternating Current
ADC - Analog to Digital Converter
ADX - Tunerpro 5 data stream definition - Tells tuner pro how to get logging information from the ecu, what data is in the stream, how to interpret it, and provides the dashboard screen layout.
AE - Acceleration Enrichment
AFPR - Adjustable Fuel Pressure Regulator
AFR - Air Fuel Ratio (sometimes written as A/F) - ideal ratio of 14.7-1 (for unleaded petrol) gives low emissions and acceptable drivability and economy. A lower ratio (11-1) would be "rich" and a higher ratio (16-1) "lean".
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
Baro - Barometric Pressure
BBDC - Before Bottom Dead Center
BBL - Barrel
BCC - the chip/bin code in the ECM.
BCM - Body Control Module
BDC - Bottom Dead Center
BIN - "Binary". Usually refers to the binary image of all the data on a memcal. Both the program (operating system) and the vehicle specific calibration.
BLM - Block Learn Multiplier - the factor which is "learned" to adjust fuel mixture as the tolerances on the factory system change over time.
BP - Barometric Pressure. also, BARO
BPC - Base Pulse Constant
BPW - Base Pulse Width - the calculated length of the pulse, or "on-time" of the fuel injector before any "tweaking" for minor inputs such as air temperature.
BSFC - Brake Specific Fuel Consumption
BTDC - Before Top Dead Center
BTU - British Thermal Units
C - Celsius
C/L Closed Loop
C3 GM ECM using Motorola 68xx-like processor (1+ MHz CPU)
CAN - Controller Area Network. CAN is a multi-master broadcast serial bus standard for connecting automotive electronics.
CAT - Catalytic Converter
CCI - Computer Controlled Ignition
CCP - Charcoal Cannister Purge; Controlled Canister Purge
CDI - Capacitive Discharge Ignition
CEL - Check Engine Light - a dashboard light (same as MIL and SES) letting you know the car has a problem and also used to flash out diagnostic codes stored by the ECM.
CFI - Central Fuel Injection - a FoMoCo designation. Similar to GM's TBI injection system.
CFI - Continuous mechanical Fuel Injection - yet another injection system. This one used on Volvos.
CFI - Crossfire Fuel Injection - an intake manifold utilizing 2 diagonally mounted throttle bodies (model 300s?), hence it's another TBI injection system. The twin 300s together are called the model 400.
CID - Cubic Inch Displacement
CKP - crankshaft position sensor
CLT - Closed Loop Term
CMP - camshaft position sensor
CNP - Coil Near Plug
CP - Canister Purge
CPU - Central Processor Unit (the brains in the ecm)
Crossings - the number of times the O2 sensor switches across stoich. It is a measure of closed loop system performance.
CTS - Coolant Temperature Sensor
DAC - Digital to Analog Converter
DB - Decibels
DC - Direct Current
DC - Duty Cycle On time, compared to total event time expressed as a percentage
DE - Deceleration Enleanment
DE - Decel Enleanment
DEF - A definition (eg XDF, ADX for tunerpro, and also might refer to other types of file for other tuning packages.
DFCO - Decleration Fuel Cut Off
DIS - Distributorless Ignition System
DRP - Distributor Reference Pulse
DVM - Digital Multi Meter
ECM - Electronic Control Module (sometimes also ECU Electronic Control Unit, or PCM Powertrain Control Model when controlling the transmission too) - the engine management computer.
ECT - Engine Coolant Temperature
ECU - Engine Control Unit
EEC - Evaporative Emission Control system - a method of purging fuel vapors (don't tell the Ford faithful whose EFI controller is known as the EEC-IV or EEC-V)
EFI - Electronic Fuel Injection
EGO - Exhaust Gas Oxygen sensor
EGR - Exhaust Gas Recirculation - use to reduce emissions and increase economy supposedly
EGT - Exhaust Gas Temperature
EPROM - Electrically Programmable Read-Only Memory - this is the replaceable memory chip which contains fuel and spark information and allows one ECM to be used in various applications.
ESC - Electronic Spark Control. knock detection & retard. Knock Control. aka Retard Signal. Used to retard the timing when detonation (knock) is detected.
EST - Electronic Spark Timing, SA control
F - Fahrenheit
FAR - Fuel Air Ratio
FED - Federal (emissions package)
FPR - Fuel Pressure Regulator
Ft/Lb - Foot Pounds
FUBAR - F***ed Up Beyond All Recognition
Gms/Sec - Grams per Second
GPS - Grams Per Second
hego - heated exhaust gas oxygen
HEI - High Energy Ignition
HO2S heated o2 sensor
HP - Horse Power
I/O Input/Output
IAC - Idle Air Control - (a controlled vacuum leak) A stepper motor controlled by the ECM. It determines how much air gets through to the engine when the throttle is at idle. The ECM controls it to maintain a programmed idle speed.
IAT - Intake Air Temperature.
IC - Integrated Circuit
ICE - Internal Combustion engine
IGN - Ignition
Injector - On Time Time in milliseconds that an injector is on.
INT - Integrator; Closed Loop Integrator
intake - valve
ION - A patented (by Saab) method for detecting "knock" or misfire in an engine by measuring a current across the sparkplug electrode known as an ionization current.
IPW - Injector Pulse Width
IS - Idle Speed
ISC - Idle Speed Control
ISCV - Idle Speed Control Valve
kapwr - keep alive power
kg - Kilogram
Kilohertz - (1,000s cycles / sec)
Km - KiloMeters
Km/L - Kilometers per Litre
kPa - Kilopascals (Pressure)
KPH - Kilometers Per Hour
KS - Knock Sensor
L - Liter (about 60 cubic inches)
LCD - Liquid Crystal Display
LM - Launch Mode
lower - to keep it open
LSA - Lobe Separation Angle
MAF - Mass Air Flow (sensor) - an alternative to MAP. This measures actual airflow into the engine and thus doesn't need to make any calculations based on VE.
MAP - Manifold Air Pressure (sensor) - a vacuum gauge. BPW fueling is primarily computed from this input on cars so equipped. Another alternative would be MAF.
MAP - Manifold Absolute Pressure
MAT - Manifold Air Temperature sensor
MCU - MicroController Unit (eg. 68HC11) - the processor on which the engine computer is based
MDP - Manifold differential Pressure
MEMCAL - Memory Calibration Unit
MFI - Multi-port Injection
MIL - malfunction indicator lamp (see CEL, SES)
MPFI - Multi-Port Fuel Injection (see MPI)
MPG - Miles Per Gallon
MPH - Miles Per Hour
MPI - Multi-Port Injection - generic name for any of the port injection systems (as opposed to TBI systems)
MT - Manual Transmission
NB - Narrow Band O2 sensor
NC - Normally Closed
NEU - Neutral
NO - Normally Open
NPTC - National Pipe thread Course
NTPF - National Pipe Thread Fine
O2 - Oxygen Sensor; (see also EGO) - Typical slang referring to the Oxygen sensor, Used 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.
OBD - On Board Diagnostics; Mandated in the US to monitor pollutions controls.
OBD1.5 - Refers to GM cars in transition form OBD1 to OBD2 in years 1994 & 1995.
OBD2 on board diagnostics from 1996 or newer vehicle. Get auto manufacturers to standardize connectors and protocols for automotive diagnostics to a greater degree.
OEM - Original Equipment Manufacturer
OL - Open Loop
OTS - Oil Temp Sensor
P/N - Park Neutral switch
P/S - Power Steering
P+H - one way of firing an injector High initial voltage to open then
P4 - GM ECM using early Motorola 68HCxx-like processor (2+ MHz CPU)
PCM - Powertrain Control Module (engine and trans control)
PCV - Positive Crankcase Ventilation
PE - Power Enrichment; Port, MPFI, Multi Port, each cyl has it's own injector close to the intake valve
PLCC - Plastic Leadless Chip Carrier
PPH - Pounds Per Hour
PPM - Pulse Per Mile - in reference to VSS
PROM - Programmable Read-only Memory
PS - Power steering
PSI - Pounds per square inch
PSIA - PSI absolute
PSIG - PSI Gauge
PW - Pulse Width
PWM -Pulse Width Modulation; Pulse Width Modulator
QDM - Quad Drive Module
QT - Quart
R-12 - Refrigerant
RAM - Random Access Memory
RAP - Retained Accessory Power
RFI - Radio Frequency Interference
ROM - Read Only Memory
RPM - Revolutions Per Minute - typically sensed by a sensor in the distributor or on the crankshaft.
RR - Right Rear
RTV - Room Temperature Vulcanizing
RWD - Rear wheel drive
SA - Spark Advance
SAE - Society of Automotive Engineers
SBC - Single Board Computer or Small Block Chevy
Scantool - A piece of test equipment which plugs into the ALDL and displays Trouble Codes and other information helpful for servicing of the egine. TunerPro RT is a software based example.
SD - Speed density. An FI technique where the amount of air entering the engine is calculated from engine RPM, MAP, and a pre-calculated volumetric efficiency for the engine.
SEFI - Sequential Electronic Fuel Injection
SES - Service Engine Soon light - aka "CEL Check Engine Light" or MIL
SFI - Sequential Fuel Injection - injectors are fired in ignition firing order for maximum performance and economy.
SI - Saturated Injector *constant* voltage current
SynchPulse - Fuel PW with delivery tied to timing of ref pulses
TAC - Thermostatic Air Cleaner
TACH - Tachometer
TB - Throttle Body
TBI - Throttle Body Injection - basically a fully electronic computer controlled carburetor
TBI - Injection system where the injectors are mounted above the
TCC - Torque Converter Clutch - a lockup mechanism for improved economy and performance
TCM - Transmission Control Module
TDC - Top Dead Center. Piston at the top of the cylinder.
TF - Throttle Follower
TFT - trans fluid temp
TH - Turbo-Hydramatic
TPI - Tuned Port Injection - intake manifold and EFI system used on Camaros and Corvettes especially
TPS - Throttle Position Sensor. Tells the ECM how "open" the throttle is.
TRC - Throttle Return Control
TSA - total spark advance
TTS - Trans Temp Sensor
TV - Throttle Valve
TVS - Thermal Vacuum Switch
VAC - Vacuum
VAFPR - Vacuum Adjusted Fuel Pressure Regulator
VATS - Vehicle Anti Theft System
VE - Volumetric Efficiency; The ratio of the amount of air going into an engine to the volume displaced by the movement of the pistons.
VIN - Vehicle Identification Number - needed when using the scantool
VRFPR - Vacuum Referenced Fuel Pressure Regulator
VSS - Vehicle Speed Sensor
WB - Wide Band O2 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
XDF - Tunerpro 5 definition; Tells tuner pro what is where in the bin, and how to interpret it.
by antus Sun Aug 09, 2009 3:29 pm
Common EFI Abbreviations
http://delcohacking.net/forums/viewt...&p=14029#p2489
This data was originally sourced from
http://www.aces.edu/~parmega/efi/glossary.htm
and has been updated.
by yoda69 Thu Sep 24, 2009 10:02 am
This list was sourced from
http-//www.diy-efi.org/gmecm/faq/biglist.txt
by antus Sun May 08, 2011 8:24 pm
Re- Common EFI Abbreviations
by EagleMark
http://www.gearhead-efi.com/Fuel-Inj...-Abbreviations
by HistoryStamp
Additional definitions not analyzed:
http://shed51.com/data.htm
