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Which method raises the filter temperature deliberately?

  • A.Injection of fuel late in the cycle so it burns over the oxidation catalyst, raising the filter temperature
  • B.Active regeneration using a late fuel injection
  • C.Passive regeneration, which occurs continuously and requires no intervention from the control unit at all
  • D.Nothing

Answer: B

Fuel injected late passes to the catalyst and burns there. The last option describes exactly that mechanism, which makes it a correct and more detailed version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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