Diesel Electronic EC System

Diesel Electronic Engine Control (EC) System

Overview

The PCM contains both engine and transmission microprocessors. Operating information, as well as fault information, is communicated between the two processors via controller area network (CAN) communications. Both can be programmed individually, however replacement of the PCM is as an assembly.

Fuel control is accomplished by the PCM and the Fuel Injection Control Module (FICM). The two modules communicate operational information via CAN communications.

The Electronic EC system provides optimum control of the engine and transmission through the enhanced capability of the Powertrain Control Module (PCM). The Electronic EC also has an on-board diagnostics monitoring system (On Board Diagnostics) with features and functions to meet federal regulations on exhaust emissions.

The EC system has two major divisions: hardware and software. The hardware includes the Powertrain Control Module (PCM), Fuel Injection Control Module (FICM), sensors, switches, actuators, solenoids, and interconnecting terminals. The software in the PCM provides the strategy control for outputs (engine and transmission hardware) based on the values of the inputs to the PCM. EC hardware and software are discussed in Computers and Control Systems.

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. The system is designed to minimize emissions and optimize fuel economy and driveability. The software strategy controls the basic operation of the engine and transmission, provides the OBD strategy, controls the Malfunction Indicator Lamp (MIL), communicates to the scan tool [New Generation Star (NGS), etc.] via the Data Link Connector (DLC), allows for Flash Electrically Erasable Programmable Read Only Memory (FEEPROM), and controls Failure Mode Effects Management (FMEM).

Modifications to OBD Vehicles

Modifications or additions to the vehicle may cause incorrect operation of the OBD 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.

If the installation/use of a non-Ford Motor Company product fails or causes a Ford part to fail, the cost of the repair and any related damage will not be covered by the Ford New Vehicle Limited Warranty, unless the product is an EPA "certified" emissions product under the Clean Air Act, Section 207 and CFR85.2112-85.2122. See your vehicle Warranty Guide for all warranty information.