Technology & Compliance
Understanding the abbreviations and technical terms used in Japanese vehicle specifications and fuel efficiency ratings.
Major Fuel Efficiency Measures
These abbreviations indicate specific technologies built into the vehicle's powertrain to reduce fuel consumption and maximize efficiency.
Idle Stop/Start
Automatically shuts down the engine when the vehicle is stationary to reduce idling fuel consumption.
Improved Combustion
Advanced engine designs utilizing high-pressure direct injection or unique cylinder heads for more efficient burning.
Fuel Injection Optimization
Precise electronic control of fuel delivery to maximize power while minimizing waste.
Intercooler
Cools the compressed air before it enters the engine, increasing its density for better combustion and efficiency.
Turbocharger
Forces extra compressed air into the combustion chamber, allowing smaller engines to produce more power efficiently.
Hybrid / Plug-in Hybrid
Combines an internal combustion engine with electric propulsion to drastically improve mileage.
Emissions & Compliance Factors
Additional factors and after-treatment technologies designed to reduce harmful exhaust emissions and meet strict global environmental regulations.
CCO
Catalytic Converter (Oxidation)Converts toxic exhaust gases and pollutants into less-toxic pollutants through redox reactions. Essential for reducing Carbon Monoxide (CO) and Hydrocarbons (HC).
EGR
Exhaust Gas RecirculationRecirculates a portion of an engine's exhaust gas back to the engine cylinders to lower combustion temperatures and significantly reduce Nitrogen Oxide (NOx) emissions.
DF / DPF
Diesel Particulate FilterA device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. Modern vehicles use active regeneration to burn off trapped soot.
SCR
Selective Catalytic ReductionAn advanced active emissions control technology system that injects a liquid-reductant agent (like AdBlue/DEF) through a special catalyst into the exhaust stream, converting NOx into harmless nitrogen and water.