Powertrain Management: Description and Operation

Circuit Description
The Multiport Fuel Injection (MFI) control system is an electronic fuel metering system with fuel injectors near inlet ports of each cylinder. The amount of fuel injection is determined by the ECM according to engine speed and intake air-flow quantity measured by sensors.

The emission control system includes oxygen sensors and catalytic converters. The MFI's three major functions are air-fuel mixture, idle speed and ignition timing control.