EEC-V Software and Hardware: Overview

PURPOSE
The Electronic Engine Control-V (EEC-V) system is designed to minimize emissions, and optimize fuel economy and driveability, providing optimum control of the engine and transmission through the enhanced capability of the microprocessor. The EEC-V also has an On-Board Diagnostics (OBD) monitoring system with expanded features and functions to meet federal regulations on exhaust emissions.

The EEC-V system has two major divisions, hardware and software.

- The hardware includes the Powertrain Control Module (PCM), Constant Control Relay Module (CCRM), sensors, switches, actuators, solenoids, and interconnecting terminals.

- The software in the PCM provides strategy control for outputs (engine and transmission hardware) based on values of inputs to PCM.

The PCM receives information from a variety of sensor and switch inputs. Based on the strategy and calibration stored within the memory chip, the PCM generates the appropriate output. Software strategy controls basic operation of the engine and transmission, provides the OBD II strategy, controls the Malfunction Indicator Lamp (MIL), communicates to the scan tool [New Generation STAR (NGS), etc.] via the Standard Corporate Protocol (SCP), allows for Flash Electrically Erasable and Programmable Read-Only-Memory (EPROM), provides adaptive idle air and fuel control, and controls Failure Mode Effects Management (FMEM).

MODIFICATIONS TO OBD II VEHICLES
Modifications or additions to the vehicle may cause incorrect operation of the OBD II system. Burglar alarms, cellular telephones and CB radios must be carefully installed. Do not install these devices by tapping into or running wires close to powertrain control system wires or components.