Power Transmission

"N" and "P" Positions

• "N" position

  Power from the input shaft is not transmitted to the output shaft because the clutches do not operate.

• "P" position

  Similar to the "N" position, the clutches do not operate. The parking pawl engages with the parking gear to mechanically hold the output shaft so that the power train is locked.

  Fig 1: Power Transmission Flow Diagram - "N" And "P" Positions

  Courtesy of NISSAN MOTOR CO., U.S.A.

"11" Position

Forward clutch  Forward one-way clutch  Overrun clutch  Low & reverse brake	As overrun clutch engages, rear internal gear is locked by the operation of low and reverse brake. This is different from that of D1 and 21 .
Engine brake	Overrun clutch always engages, therefore engine brake can be obtained when decelerating.

"D1" and "21" Positions

Forward one-way clutch  Forward clutch  Low one-way clutch	Rear internal gear is locked to rotate counterclockwise because of the functioning of these three clutches.
Overrun clutch  engagement conditions (Engine brake)	D1 : OD OFF (OD OFF indicator lamp is on) and throttle opening is less than specification(1) 21 : Always engaged At D1 and 21 positions, engine brake is not activated due to free turning of low one-way clutch.
(1) Overrun clutch remains in engaged condition when throttle opening is less than 1/16.

"D₂ ", "2₂ " and "1₂ " Positions

Forward clutch  Forward one-way clutch  Brake band	Rear sun gear drives rear planetary carrier and combined front internal gear. Front internal gear now rotates around front sun gear accompanying front planetary carrier. As front planetary carrier transfers the power to rear internal gear through forward clutch and forward one-way clutch, this rotation of rear internal gear increases the speed of rear planetary carrier compared with that of the 1st speed.
Overrun clutch  engagement conditions	D2 : OD OFF (OD OFF indicator lamp is on) and throttle opening is less than specification(1) 22 and 12 : Always engaged
(1) Overrun clutch remains in engaged condition when throttle opening is less than 1/16.

"D₃ ", "2₃ " and "1₃ " Positions

High clutch  Forward clutch  Forward one-way clutch	Input power is transmitted to front planetary carrier through high clutch. And front planetary carrier is connected to rear internal gear by operation of forward clutch and forward one-way clutch. This rear internal gear rotation and another input (the rear sun gear) accompany rear planetary carrier to turn at the same speed.
Overrun clutch  engagement conditions	D3 : OD OFF (OD OFF indicator lamp is on) and throttle opening is less than specification(1) 23 and 13 : Always engaged
(1) Overrun clutch remains in engaged condition when throttle opening is less than 1/16.

"D₄ " (OD) Position

High clutch  Brake band  Forward clutch  (Does not affect power transmission)	Input power is transmitted to front carrier through high clutch. This front carrier turns around the sun gear which is fixed by brake band and makes front internal gear (output) turn faster.
Engine brake	At D4 position, there is no one-way clutch in the power transaxle line and engine brake can be obtained when decelerating.

"R" Position

Reverse clutch  Low & reverse brake	Front planetary carrier is stationary because of the operation of low and reverse brake. Input power is transmitted to front sun gear through reverse clutch, which drives front internal gear in the opposite direction.
Engine brake	As there is no one-way clutch in the power transaxle line, engine brake can be obtained when decelerating.