Connector Removal Note

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Pull the rubber boot outward.
Pull down the lever in the direction indicated by the arrow and disconnect the connector.

Fig 1: Pulling Down Lever And Disconnect Connector
Courtesy of MAZDA MOTORS CORP.