Which statement(s) about the Multi-Displacement System is/are correct?
A) During cruise, the PCM turns off the fuel injectors for four of the eight cylinders.
B) During cruise, the PCM simultaneously closes all of the valves on the disabled cylinders
C) During idle, the PCM will not disable the cylinders.
D) All of these statements are correct.

Question

Quizplus · Accepted Answer

The Multi-Displacement System (MDS) is designed to improve fuel efficiency by disabling a portion of the engine's cylinders under certain conditions, such as cruising, to reduce fuel consumption. Statement A is correct because the PCM (Powertrain Control Module) does indeed turn off fuel injectors to some cylinders (typically half in a V8) during cruise conditions to save fuel. Statement B is accurate as the system not only stops fuel injection but also prevents the valves in the disabled cylinders from opening, effectively turning them off. Statement C is true because the system is designed to operate under specific conditions, typically not including idle, to ensure smooth operation and immediate power availability when needed. Therefore, all statements A, B, and C correctly describe aspects of the Multi-Displacement System's operation.

Which Statement(s) About the Multi-Displacement System Is/are Correct