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Thread: ALDL EFI Abbreviations

  1. #1
    Fuel Injected! historystamp's Avatar
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    ALDL EFI Acronyms and Abbreviations Defined

    Quote Originally Posted by EagleMark View Post
    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

    Attached Files Attached Files
    Last edited by historystamp; 01-03-2012 at 02:42 AM. Reason: cleanup

  2. #2
    Electronic Ignition!
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    Thanks for post. This is so useful.

  3. #3
    Electronic Ignition!
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    Yep, very helpful

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