During closed-loop operation, the PCM may alter the throttle position to meet load demands.

• A. True
• B. Only During Open-Loop
• C. During Idle
• D. Never

Answer: (A)

In closed-loop operation, the engine control module uses sensor feedback to keep the air-fuel mixture at the target ratio, and it can also adjust throttle opening to help meet the engine’s load demands. With electronic throttle control, the PCM commands the throttle plate directly, so it may open or close the throttle as needed even while still using feedback to optimize mixtures. This lets the system maintain the desired idle speed, respond to changing loads, and smooth acceleration without waiting for fuel changes alone. That’s why the statement is true. It isn’t limited to open-loop, nor restricted to idle, and it certainly isn’t never true.