BTW the current D4D is not turbo, and I dont think a Turbo diesel will be introduced as even in 11the Gen, Euro Corolla its the same D4D without turbo. or may be they introduce it in our market the D4D turbo.. India will have the turbo variant
D-4D means Direct injection, 4 stroke, Common rail Diesel and is on all Toyota diesel models.
D-4D is a combination of Direct injection and Common-rail diesel injection systems and has been designed to provide higher output power, better fuel economy, lower exhaust emissions and lower noise and vibration than conventional diesel engines.
Common Rail Fuel System
With a common rail fuel system, an extremely high fuel pressure is created in the supply pump and this is fed directly to the common rail which is located on the engine and is connected to the injectors.
Compared to previous diesel engines, the Common-rail system supplies highly pressurized fuel injection even at low engine speeds. As the highly pressurized fuel exits the injector?s very small holes (which are about the same diameter as a human hair), the fuel is sent to the combustion chamber as an extremely fine spray (particle of fuel is small).
Fuel injection is controlled electronically by an ECU (Electrical control unit).
The ECU detects the driving conditions through the signals from various sensors and calculates the correct injection volume and timing. Then, the ECU sends a signal to the injector to operate for precise and accurate control in the same way electronic fuel injection functions on petrol engines.