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Which valve controls the purge flow?

  • A.A pulse width modulated solenoid, whose duty cycle meters the vapour drawn into the manifold under the controller
  • B.A solenoid operated purge valve
  • C.The throttle, which creates the depression and therefore determines the quantity of vapour drawn from the canister
  • D.Nothing

Answer: B

A modulated solenoid meters the purge flow precisely. The last option describes exactly that control, which makes it a correct and more detailed version. Manifold depression genuinely provides the driving force. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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