General System Description

ECM Mounting:

The Electronic Control Module (ECM) is the control center for the Digital Fuel Injection (DFI) system and ignition system. The ECM constantly monitors information from various data sensors and controls output devices that affect vehicle performance. To allow one type of ECM to be used for many different vehicles, a device called a Memory-Calibration (MEM-CAL) unit is used. The MEM-CAL is located inside the ECM and has system calibration information based upon the vehicle's axle ratio, engine, transmission, weight, and other specific configurations of the vehicle. Since the MEM-CAL unit is unique to specific vehicles, it is important to install the MEM-CAL unit into the new ECM when servicing. The ECM also has self-diagnostic functions which stores trouble codes and alerts the driver through a warning lamp on the instrument panel.