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Which sensor allows the controller to identify cylinder number one?

  • A.The crankshaft position sensor, whose missing tooth identifies the cylinder as well as the angular position
  • B.The knock sensor
  • C.The throttle position sensor, which indicates the load and therefore permits the firing order to be established
  • D.The camshaft position sensor

Answer: D

The crankshaft sensor gives position twice per cycle, so a camshaft sensor is needed to say which revolution is which. The missing tooth genuinely identifies angular position, which makes the second option half right and therefore tempting. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape.

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