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Main reason for having a throttle body on a Diesel is EGR and it also has a role to play during engine shutdown. When engine is turned off the valve closes and cuts air into the cylinders this helps to achieve a relatively smoother shut down. Throttle body works as an Anti-Shudder Valve (ASV).
In this regard, how does a diesel throttle work?
The throttle on a gasoline engine is typically a butterfly valve. When the throttle is partially closed, a manifold vacuum develops as the intake drops below ambient pressure. The power output of a diesel engine is controlled by regulating the quantity of fuel that is injected into the cylinder.
In this regard, does a diesel have a throttle body?
Diesel engines don't need a throttle body. Engine RPM is controlled by the amount of fuel injected, as well as minor changes in injection timing. (although it could be said that a turbocharger helps to control air flow) One problem that arises from not having a throttle body is that there is no vacuum source.
On a fuel-injected engine the throttle body is normally located between the air filter and the intake manifold, and is connected to the gas pedal mechanically with a cable, or electronically by wire. When the driver presses the pedal the butterfly in the throttle body pivots to let more air flow into the manifold.