Throttle Opener System

The system is made up of a servo diaphragm connected to primary throttle valve, and a vacuum control valve, which is located between the intake manifold and servo diaphragm. Throttle opener system uses intake manifold vacuum during deceleration to slightly open primary throttle valve. Primary throttle is held open until engine slows to 1400 RPM (1800 & 616), 1300 RPM (1200) or 1200 RPM (808).

Fig 1: Vacuum Circuit

Courtesy of MAZDA MOTORS CORP.

Fig 2: Wiring Diagram

Courtesy of MAZDA MOTORS CORP.