Powertrain Management: Description and Operation

MPI System Inputs And Outputs:

MPI for the 2.8 Liter V6

DESCRIPTION
The MPI MFI Engine Management System combines the ignition system, fuel injection system, and emissions system into a single electronically controlled system. The MPI system uses a single control module with an internal digital micro-computer. A number of three dimensional maps are stored in the control module's memory. These maps are used to control ignition timing, knock regulation, injection timing and all other subsystems.

PURPOSE
The MPI MFI Engine Management System is to electronically regulate the air/fuel mixture, idle speed and ignition timing to achieve optimum engine performance. Optimum performance means the best possible compromise between the demands of high power, low fuel consumption, and the cleanest possible exhaust emissions.

MPI SUBSYSTEM FUNCTIONS

Sequential Fuel Injection
^ Basic adaptation
^ Cold-start enrichment
^ After-start enrichment
^ Acceleration enrichment
^ Deceleration fuel shut-off
^ Engine RPM limitation
^ Vehicle speed limitation (130 mph)

Ignition
^ Basic ignition map
^ Dwell angle control
^ Warm-up control
^ Initial shift point control (automatic trans only)
^ Cylinder selective knock control

Idle Speed Control with adaptation
^ Map controlled
^ Start controlled
^ Climate control compensation(A/C ON/OFF)
^ Loaded idle speed control (trans in gear, auto trans only)

Intake Manifold Control
^ Intake manifold size controlled according to engine speed

Exhaust Gas Recirculation
^ Map controlled
^ Exhaust gas temperature sensor

Evaporative Emission System
^ Map controlled

Heated Oxygen Sensor
^ Map controlled