MFI Engine Management System

On later models, Multiport Fuel Injection (MFI) system has been modified for increased capabilities. With a new Engine Control Module (ECM) it has greater processing capacity, increased memory storage and a permanent diagnostic trouble code memory. The modified MFI system now has fully adaptive oxygen sensor control. A new Mass Airflow (MAF) sensor is used without a CO adjustment potentiometer. CO adjustment is not possible on later models.

One Engine Control Module (ECM) is used for all applications worldwide. New ECM must be coded with the V.A.G. 1551 scan tool when installed in vehicle.

Input and output signals from various sensors, switches and signaling devices are constantly monitored for engine control and trouble codes. If trouble code(s) occur, they are stored in memory. Trouble codes can be displayed by a flashing 4-digit code sequence from a Malfunction Indicator Light (MIL) located in the instrument cluster.