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Which mode does the controller use before the lambda sensor is ready?

  • A.Limp home
  • B.Open loop with a fixed enrichment, which is applied until the sensor has reached its operating temperature
  • C.Open loop, using the map without feedback
  • D.Closed loop, using the reading from the downstream sensor until the upstream sensor reaches its temperature

Answer: C

Without a valid oxygen signal the controller must run from the map alone. That map includes a warm up enrichment, which makes the last option a correct and more detailed description of the same mode. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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