Nissan Frontier D22. Manual — part 12

OVERALL SYSTEM

AT-17

[RL4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

POWER TRANSMISSION
“N” and “P” Positions

●

“N” position
No control members operate. 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, no control members operate. The parking pawl interconnected with the select
lever engages with the parking gear to mechanically hold the output shaft so that the powertrain is locked.

SAT039J

AT-18

[RL4R01A]

OVERALL SYSTEM

“1

1

” Position

SAT100J

●

Forward clutch

●

Forward one-way clutch

●

Overrun clutch

●

Low and 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 D

1

and 2

1

.

Engine brake

Overrun clutch always engages, therefore engine brake can be obtained when decel-
erating.

OVERALL SYSTEM

AT-19

[RL4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

“D

1

” and “2

1

” Positions

SAT096J

●

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 (Start-up at D

1

).

Overrun clutch
engagement conditions
(Engine brake)

D

1

: Overdrive control switch “OFF” and throttle opening is less than 3/16

2

1

: Throttle opening less than 3/16

At D

1

and 2

1

positions, engine brake is not activated due to free turning of low one-

way clutch.

AT-20

[RL4R01A]

OVERALL SYSTEM

“D

2

”, “2

2

” and “1

2

” Positions

SAT097J

●

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

D

2

: Overdrive control switch “OFF” and throttle opening is less than 3/16

2

2

: Throttle opening less than 3/16

1

2

: Always engaged