Practice question

Which actuator is directly controlled by the ECU using a pulse-width modulated (PWM) duty cycle to maintain engine idle speed?

  1. Manual clutch slave cylinder
  2. Idle Air Control (IAC) valve or electronic throttle body motor
  3. Engine oil pump pressure relief valve
  4. Mechanical fuel pressure regulator diaphragm

Answer: B — Idle Air Control (IAC) valve or electronic throttle body motor

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