As I've been reading over this tuning stuff, I was finding myself stumbling sometimes over the various acronyms these guys would throw around with wild abandon that I didn't have a clue about what they meant. So I had to make up a cheat sheet that I could refer to when I hit one I didn't remember what it actually meant.
A- ABS - Antilock Brake System
- AFR - Air Fuel Ratio
- AIR - Secondary Air Injection
B- BARO - Barometric Pressure
- BCM - Body Control Module
- BEN - Base Efficiency Numerator
- BHP - Brake Horsepower
C- CAC - Charge Air Cooler
- CARB - California Air Resources Board
- CAS - Crank Angle Sensor
- CC - Catalytic Converter
- CCP - Controlled Canister Purge
- CCV - Canister Control Valve
- CFI - Continuous Fuel Injection
- CFM - Cubic Feet per Minute
- CID - Component ID
- CID - Cubic Inch Displacement
- CKP - Crankshaft Position
- CL - Closed Loop
- CMP - Camshaft Position
- COP - Coil On Plug Ignition
- CP - Canister Purge
- CTP - Closed Throttle Position
D- DBC - Drive By Cable
- DBW - Drive By Wire
- DFCO - Deceleration Fuel Cut Off
- DFI - Direct Fuel Injection
- DMA - Direct Memory Access
- DTC - Diagnostic Trouble Code
- DTM - Diagnostic Test Mode
E- EBCM - Electronic Brake Control Module
- EBTCM - Electronic Brake Traction Control Module
- EC - Engine Control
- ECL - Engine Coolant Level
- ECM - Engine Control Module
- ECT - Engine Coolant Temperature
- EECS - Evaporative Emissions Control System
- EFE - Early Fuel Evaporation System
- EFI - Electronic Fuel Injection
- EGR - Exhaust Gas Recirculation
- EGRT - Exhaust Gas Recirculation Temperature
- ESC - Electronic Spark Control
- EST - Electronic Spark Timing
- ETC - Electronic Throttle Control
- EV-ETS - Electric Vehicle Energy Transfer System
- EVAP - Evaporative Emission System
- EVRV - Electronic Vacuum Regulator Valve for EGR
F- FFTC - Freeze Frame Trouble Codes
- FI - Fuel Injection
- FT. LB. - Foot Pound
- FT - Fuel Trim
- FTC - Fuel Trim Cell #
- FUBAR - Farked Up Beyond All Recognition
G- GND - Ground
- GPS - Grams Per Second
- GVM - Gross Vehicle Mass
H- HEGO - Heated Exhaust Gas Oxygen Sensor
- Hg - Mercury
- HO2S - Heated Oxygen Sensor
- HVAC - Heating Ventilation and Air Conditioning
I- IA - Intake Air
- IAC - Idle Air Control
- IAT - Intake Air Temperature
- ICM - Ignition Control Module
- IFI - Indirect Fuel Injection
- IFS - Inertia Fuel Shutoff
- IGN - Ignition
- IIIBDFI - If It Isn't Broke, Don't Fix It
- ISC - Idle Speed Control
J
K- kHz - Kilohertz
- KISS - Keep It Simple, Stupid
- KOEC - Key On, Engine Cranking
- KOEO - Key On, Engine Off
- KOER - Key On, Engine Running
- kPa - Kilopascals
- Km - kilometers
- KR - Knock Retard
- KS - Knock Sensor
- KSM - Knock Sensor Module
L- LTFT - Long Term Fuel Trim
- LTIT - Long Term Idle Trim
M- MAF - Mass Air Flow
- MAP - Manifold Absolute Pressure
- MDP - Manifold Differential Pressure
- MHz - Megahertz
- MIL - Malfunction Indicator Lamp
- MPG - Miles Per Gallon
- MPH - Miles Per Hour
N
O- O2S11 - O2 Sensor Voltage Bank 1, Sensor 1
- O2S21 - O2 Sensor Voltage Bank 2, Sensor 1
- OBD II - Onboard Diagnostics, Second Generation
- OEM - Original Equipment Manufacture
- OL - Open Loop
P- PAIR - Pulsed Secondary Air Injection
- PCM - Powertrain Control Module
- PCV - Positive Crankcase Ventilation
- PFI - Port Fuel Injection
- PID - Parameter Identifier
- PRN - Parameter Reference Number
- PTC - Pending Trouble Code
- PWM - Pulse Width Modulation
Q
R- RAFIG - Required Air Flow In Gear
- RAFPN - Required Air Flow In Park/Neutral
- RAM - Random Access Memory (read/write)
- ROM - Read Only Memory
- RPM - Revolutions Per Minute (Engine Speed)
S- SAE - Society of Automotive Engineers
- SC - Supercharger
- SFI - Sequential Fuel Injection
- SLOT - Scaling, Limit(s), Offset and Transfer
- SMS - Specifically Monitored Systems
- SPARKADV - Spark Advance
- SRS - Supplemental Restraint System
- SRT - System Readiness Tests
- STFT - Short Term Fuel Trim
- STIT - Short Term Idle Trim
T- TAC - Thermostatic Air Cleaner
- TAC - Throttle Actuator Control
- TB - Throttle Body
- TBI - Throttle Body Injection
- TC - Turbocharger
- TCM - Transmission Control Module
- TID - Test ID
- TP - Throttle Position
- TPMS - Tire Pressure Monitor System
- TPS - Throttle Position Sensor
- TVV - Thermal Vaccum Valve
U- USB - Universal Serial Bus
V- VIN - Vehicle Identification Number
- VPW - Variable Pulse Width
- VR - Voltage Regulator
- VSS - Vehicle Speed Sensor
W- WOT - Wide Open Throttle
- WSS - Wheel Speed Sensor
X
Y
Z
If you guys see any errors or needed additions, please let me know. I will edit this list as necessary to make corrections or additions.