By-Pass Control Solenoids

Two air intake paths are provided in intake manifold. This allows ECU to select path length most favorable (power/performance) for a given engine speed. These air paths are selected by ECU based upon sensor input signals. ECU controls by-pass valves in intake manifold through use of 2 by-pass control solenoids and a by-pass valve control diaphragm. See PGM-FI SYSTEM article in FUEL SYSTEMS section.