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Which diagnostic reveals a recirculation flow fault?

  • A.Comparing commanded position with measured flow or pressure
  • B.Reading the fault code alone, which identifies the failed component and therefore requires no further checking
  • C.Nothing
  • D.Observation of the valve position feedback together with the air mass or differential pressure response to the command

Answer: A

The controller compares what it commanded with what actually happened. The last option describes exactly that comparison, which makes it a correct and more detailed version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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