The PCM uses a set throttle position during open-loop idle.

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Enhance your skills with the Power and Performance III Tuners Test. Prepare using flashcards and multiple-choice questions, each with comprehensive explanations and hints. Excel in your exam with confidence!

Multiple Choice

The PCM uses a set throttle position during open-loop idle.

Explanation:
Open-loop idle relies on a preset throttle opening. The PCM isn’t using feedback from sensors like the O2 sensor to trim fueling, so it commands a specific throttle position to hold idle. This fixed or predetermined position is what keeps the engine idling before closed-loop operation can begin. Because the system isn’t reacting to real-time exhaust feedback, the throttle is effectively set to a known position to maintain the target idle speed. That’s why the statement is correct.

Open-loop idle relies on a preset throttle opening. The PCM isn’t using feedback from sensors like the O2 sensor to trim fueling, so it commands a specific throttle position to hold idle. This fixed or predetermined position is what keeps the engine idling before closed-loop operation can begin. Because the system isn’t reacting to real-time exhaust feedback, the throttle is effectively set to a known position to maintain the target idle speed. That’s why the statement is correct.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy