Acronym Definitions

ALVW Adjusted Loaded Vehicle Weight, (Curb Weight + GVWR) /2
CALIFORNIA ARB California Air Pressure Board
CARB California Air Resource Board
CARB LEV Low Emission Vehicle
CARB TLEV Transitional Low Emission Vehicle
CARB ULEV Ultra Low Emission Vehicle
CARB ZEV Zero Emission Vehicle
CI Cylinder Injection
GVWR Gross Vehicle Weight Rating, Curb weight plus payload
HHDDE Heavy Heavy Duty Diesel Engine
MHDE Medium Heavy Duty Diesel Engine
LDDT Light Duty Diesel Truck categories
LDT Light Duty Truck (gasoline) categories based on weight
LDV Light Duty Vehicle, generally passenger cars and light trucks under 6000 pounds GVWR
LHDE Light Heavy Duty Engine (several weight categories)
LVW Loaded Vehicle Weight, curb weight plus 300 pounds
MDT Medium Duty Truck categories based on weight
MHDE Medium Heavy Duty Engine
PC Passenger Car
SI Sequential Injection
Tier 0 California and Federal regulations effective prior to Tier 1 phase in dates
Tier 1 California regulations beginning in 1993 model year and Federal regulations beginning in 1994 model year