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

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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.

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