P/N Position: Outline

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The driving force of the input shaft is transmitted to the reverse and high clutch drum. None of the clutches are operating, so this force is not transmitted to the reduction gear. Therefore, the vehicle does not move.
The reduction gear is locked because the parking gear is mechanically locked by the parking pawl. (P position).

Fig 1: P/N Position Driving Force
Courtesy of MAZDA MOTORS CORP.