In an electronic return-less SMPI system, the PCM controls all of the following EXCEPT:
A) Intake manifold pressure
B) Fuel pump speed
C) Fuel rail pressure
D) Fuel pressure differential across the fuel injectors

Question

Quizplus · Accepted Answer

The PCM (Powertrain Control Module) does not directly control intake manifold pressure; this is influenced by the engine's operation and controlled through other means such as the throttle body and intake manifold design. The PCM does control fuel pump speed, fuel rail pressure, and can influence the fuel pressure differential across the fuel injectors in an electronic return-less Sequential Multi-Port Injection (SMPI) system.

In an Electronic Return-Less SMPI System, the PCM Controls All