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The mode in which the controller fuels from its map without oxygen sensor feedback is called _____.

  • A.limp home
  • B.adaptive control, which is the process by which the long term fuel trim values are learned and stored by the unit
  • C.open loop
  • D.closed loop, which is instead the mode in which the oxygen sensor signal is used to correct the mixture continuously

Answer: C

Open loop applies during warm up, at full load and on overrun, when feedback is either unavailable or deliberately suspended. Most of a journey's emissions are produced during that warm up period. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist.

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