Fuel Injection Control System

PURPOSE
The Multiport Fuel Injection (MFI) Control System is designed to take inputs from various sensors and decide how much fuel the engine needs.

OPERATION
The amount of fuel injected from the fuel injector is determined by the ECCS control module (ECM). The ECM controls the length of time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the ECM memory. The program value is preset by engine operating conditions. These conditions are determined by input signals (for engine speed and air intake) from both the camshaft position sensor and the mass air flow sensor.
The amount of fuel injection is compensated for to improve engine performance. This will be made under various operating conditions as listed below.

Fuel increase
1) During warm-up
2) When starting the engine
3) During acceleration
4) Hot-engine operation
5) When selector lever is changed from "N" to "D" (A/T models only)
6) High-load, high-speed operation

Fuel decrease
1) During deceleration