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Which condition must be met for the monitor to run?

  • A.Nothing, since the monitor runs whenever the vehicle is switched off regardless of any other condition
  • B.Only a warm engine
  • C.A fuel level within a defined band together with a stable ambient temperature, since both affect the vapour pressure
  • D.A suitable fuel level and stable temperature

Answer: D

The test needs a defined vapour space and stable conditions. The last option lists those conditions, which makes it a correct and more precise version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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