How does a diesel engine utilize engine braking if there is no throttle body to control air intake like in a gas engine?
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If you drive an old diesel car, the engine braking is terrible / non-existent. Pretty much every modern diesel has a turbo that restricts the exhaust to provide some engine braking. Some trucks have specially designed turbos that adjust their vanes while braking, and redirect some exhaust back into the intake to increase engine braking. Others have a valve that blocks the exhaust pipe. I don’t think jake brakes are common on anything smaller than a class 7 truck.
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