Engine Control Module: Description and Operation

PURPOSE

The Engine Control Module (ECM) contains the micro-processor which is the "brain" of the Programmed Fuel Injection (PGM-FI) system.

OPERATION

The ECM sends "reference" signals to various sensors and receives modified signals which indicate current engine operating parameters. The ECM matches these values to the values that are stored in ROM memory. It then controls various functions, such as Fuel Injector duration and Ignition timing, to keep the engine within established operating parameters.