During closed-loop operation of a fuel injection system, the PCM is programmed to perform all of the following functions EXCEPT :
A) controlling how much fuel is introduced into the intake manifold
B) fine-tuning the air-fuel ratio to minimize toxic emissions while maximizing fuel economy
C) retaining good driveability under cruise and light-to-moderate acceleration
D) maximizing driveability during cold starts and hard accelerations

Question

Quizplus · Accepted Answer

During closed-loop operation, the primary focus of the PCM (Powertrain Control Module) is to maintain an optimal air-fuel ratio, especially under conditions of cruise and moderate acceleration, by adjusting the amount of fuel injected based on feedback from the oxygen sensor(s). This process aims to minimize emissions and maximize fuel economy while maintaining good driveability. However, maximizing driveability during cold starts and hard accelerations is more characteristic of open-loop operation, where the PCM relies on preset parameters rather than feedback from sensors, to ensure the engine runs rich enough for these conditions.

During Closed-Loop Operation of a Fuel Injection System, the PCM