Computers and Control Systems: Description and Operation

ECM And Connector:

Purpose:
The Computer Command Control System uses an Electronic Control Module (ECM) capable of monitoring a number of engine and vehicle operating functions. The ECM controls the following systems:

- Fuel Delivery
- Ignition/Electronic Spark Timing (EST)
- Electronic Spark Control (ESC)
- Air management
- Air Conditioning Compressor Clutch
- Coolant Fan
- Engine Speed
- Evaporative Emission Control
- Exhaust Gas Recirculation (EGR)
- [1][2]Torque Converter Clutch. (TCC)

Operation:
The computer system has a built-in diagnostic system that recognizes and identifies possible operational problems.

The computer system signals the driver through a "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR" Light located on the instrument panel. The "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR" light will remain "ON" until the problem is identified and repaired. This light is combined with the built-in diagnostic system in order to assist the technician in locating and correcting problems within the system. The light, by flashing a series of codes, identify the possible problem areas at fault.

The system also allows for near normal driving conditions during system malfunction, through the use of a built-in backup system. The backup system remains in effect until repairs can be made.