An exhaust gas recirculation system adapted for use by an internal combustion engine, and for selectively diverting a recirculated portion of the engine exhaust away from the EGR cooler, includes a by-pass conduit andor feed line shiftable between open and closed conditions, and an active material actuator. The system includes a current sensor which senses the net current in the cable, an amplifier unit, the input signal of which is controlled by the current sensed by the current sensor, and a magnetizing winding situated on the booster transformer core. The pump system may be controlled with various circuits and processors receiving instructions from a software program.