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Which two variables index a basic engine map?

  • A.Load and throttle position, which are closely related and therefore provide the two axes of the map used
  • B.Engine speed and load
  • C.Engine speed and coolant temperature, which together determine the fuel required under every operating condition
  • D.Throttle angle and time

Answer: B

Speed and load form the two axes, with corrections applied for temperature, altitude and other conditions. Throttle position genuinely is one of the ways load is inferred, which makes the last option a real if partially redundant pairing. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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