Single Module Engine Controller (SMEC)

SMEC is a digital computer containing a microprocessor. The module receives input signals from various switches and sensors. After computing input data, SMEC sends output signals to the fuel injectors, distributor, ignition coil, AIS motor, purge solenoid, alternator and cooling fan switch.

SMEC contains the circuits necessary to drive the ignition coil, fuel injector and alternator field. These are high current devices and have been isolated to minimize electrical noise in the passenger compartment. Distributor pick-up signal goes to SMEC. If no distributor signal is given to SMEC, power is shut off from the fuel injector, fuel pump and ignition coil.

SMEC also performs self diagnostic functions. This diagnostic information is stored in the way of trouble codes. Trouble codes can be read by a technician by means of a diagnostic readout tool, or by means of the instrument panel check engine light.