This is from Molly:
Stole this from YotaTech
TECH TERMS2H - 2-wheel drive / high range
4H - 4-wheel drive / high range
4L - 4-wheel drive / low range
A/T - All-Terrain; often used when referring to tires, a tire that is more apt to off-road conditions however less aggressive than a mud-terrain tire
AAL - Add-a-Leaf
ABS - Anti-lock brake system
ADD - Automatic Disconnecting Differential System; disconnects the front axles and hub assemblies from the drive shaft at the differential when the vehicle is in 2-wheel drive mode, eliminating the need to disconnect them manually. It also engages the front axles to the differential when 4-wheel drive is selected
Air Down - Partially deflating tires to improve traction
Air Locker - Pneumatically-activated differential locker
ARB - Manufacturer of high-quality aftermarket 4x4 accessories, including their patented air locking differential as well as armor for all areas of your 4x4
AT-PZEV - Advanced Technology Partial Zero Emission Vehicle; vehicles that produce extremely low levels of hydrocarbons and oxides of nitrogen
A-TRAC - Active Traction Control; incorporates sensors at all four wheels to monitor a loss of traction, Active TRAC employs brake and throttle control to reduce wheel spin and transfer torque to the wheel with the most traction.
Auto LSD - Automatic Limited-Slip Differential; differential that automatically distributes power to the wheel that has traction, this type of differential is preferred in slippery conditions (snow, ice, gravel, etc...)
BFG - B.F. Goodrich Tires
CAI - Cold Air Intake
CARB - California Air Resources Board
Cat - Catalytic converter; exhaust device installed before the muffler to reduce emissions (Cali-spec models have dual cat's)
Cat-Back - Exhaust system after the catalytic converter
CEL - Check Engine Light
CHMSL - Center High-Mount Stop Lamp
COG - Center of Gravity
CRS - Child Restraint System
CV - Constant Velocity
DAC - Downhill Assist Control; system that automatically applies the brakes during a downhill descent without locking the wheels
DOHC - Double Overhead Cam
DOT - Department of Transportation
DRL - Daytime Running Lights
ECM - Electronic Control Module. The brains of newer rigs. See ECU.
ECT - Electronically Controlled Transmission; automatic transmissions only
ECT-i - Electronically Controlled Transmission with Intelligence; automatic transmissions only
ECU - Electronic Control Unit. See ECM.
EFI - Electronic Fuel Injection
EGR - Exhaust Gas Recirculation
E-Locker - Electronic Locking Differential
FJC - FJ Cruiser (2006+)
Fob - Key ring remove device; door locks, remote start, etc…
FSM - Factory Service Manual; repair manuals written by Toyota and used by all Certified Toyota Technicians
FUBAR-A term that describes a lot of trail breaks or electrical problems. From the military, meaning "F***ed up beyond all recognition".
GAWRF - Gross axle weight rating front axle; the max weight the front axle is designed to carry
GAWRR - Gross axle weight rating rear axle; the max weight the rear axle is designed to carry
GPS - Global Positioning Satellite
GVWR - Gross Vehicle Weight Rating; maximum combined weight rating including the vehicle and its equipment, fluids, occupants and cargo.
HAC - Hill-Start Assist Control; automatically increases brake pressure to all four wheels to reduce rolling backwards while accelerating uphill.
HID - High Intensity Discharge; extremely bright, often blue in color, low-wattage lights
IFS - Independent Front Suspension
IAC- Idle air control valve. This controls the air/fuel mixture at idle on a lot of fuel injected engines.
LCA - Lower Control Arm
LCD - Liquid Crystal Display
LED - Light-Emitting Diode
LEV - Low Emission Vehicle
Live axle - Straight axle (non-IFS)
Locker - Device put in differentials to lock gears together providing exceptional off-road traction.
Locking Hubs - Engage-able free-spinning front hubs (i.e. Aisin manual hubs); preferred due to the ability to reduce wear on components when 4-wheel drive is not engaged.
LSD - Limited Slip Differential; type of differential that improves traction by splitting torque evenly and preventing one wheel from slipping or spinning, this type of differential is preferred in slippery conditions (snow, ice, gravel, etc...)
LSPBV - Load-Sensing Proportioning and Bypass Valve; mounted to the frame and the rear axle, the LSP & BV senses the weight distribution of the vehicle and automatically varies the amount of hydraulic pressure to the rear brakes based on the load in the vehicle, this helps to reduce rear-wheel lock-up with either light or heavy loads to maintain stopping control.
M/T - Mud-Terrain; often used when referring to tires, a tire that is made specifically for off-road conditions
MAF - Mass Air-Flow Sensor
OBA - On-Board Air
OBD/OBD II - On-Board Diagnostics
OEM - Original Equipment Manufacturer
OHV - Off-Highway Vehicle
OME - Old Man Emu
PCM - Powertrain Control Module
PCV - Positive Crankcase Ventilation
R&P - Ring and Pinion; differential gears
RR Diff Lock - Rear Differential Lock
RSCA - Roll-sensing Side Curtain Airbag
SAC - Solid Axle Conversion
SAS - Solid Axle Swap
SAW - Sway A Way
SFA - Solid Front Axle
SOA - Spring Over Axle
SOHC - Single Overhead Cam
SOL-A common use term describing either trail breakage or what happens when you wheel by yourself. "S*** outta luck".
SRS - Supplemental Restraint System; airbags inflated with nitrogen gas that deploy within a fraction of a second
SULEV - Super Ultra Low Emission Vehicle
TBI- Throttle body injection. Commonly refers to the throttle body on fuel injected engines.
TPMS - Tire Pressure Monitoring System; alerts the driver by illuminating an indicator on the dash when tire pressure reaches a critically low level
TRAC - Traction control; helps to avoid slippage of the driving wheels by slightly applying the brake on a slipping drive wheel and reducing the throttle to maintain traction according to the road surface conditions.
TRD - Toyota Racing Development
TSB - Toyota Service Bulletin
UCA - Upper Control Arm
ULEV II - Ultra Low Emission Vehicle II
Unibody - The floor pan of a vehicle and chassis are connected to form a single structure; there is no separate frame. By welding all body panels together to form the vehicle's frame, it is possible to build in strength and rigidity with less weight.
URD - Underdog Racing Development; manufacturer/distributor for various aftermarket performance parts including the TRD Superchargers
VSC - Vehicle Stability Control
VVT-i – Variable Valve Timing with Intelligence; varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position.
WOT - Wide-Open Throttle
Y-pipe - Pipe used to split/bypass the exhaust