NISSAN ALMERA N16 2003 Electronic Repair Manual

OVERALL SYSTEM
AT-15
D
E
F
G
H
I
J
K
L
MA
B
AT
Circuit DiagramECS007NF
YAT 3 5 3

AT-16
OVERALL SYSTEM
Cross-Sectional View
ECS007NG
SAT842J

OVERALL SYSTEM
AT-17
D
E
F
G
H
I
J
K
L
MA
B
AT
Hydraulic Control CircuitECS007NH
SAT844J

AT-18
OVERALL SYSTEM
Shift Mechanism
ECS007NI
CONSTRUCTION
FUNCTION OF CLUTCH AND BRAKE
CLUTCH AND BAND CHART
1. Torque converter 2. Oil pump 3. Input shaft
4. Brake band 5. Reverse clutch 6. High clutch
7. Front sun gear 8. Front pinion gear 9. Front internal gear
10. Front planetary carrier 11. Rear sun gear 12. Rear pinion gear
13. Rear internal gear 14. Rear planetary carrier 15. Forward clutch
16. Forward one-way clutch 17. Overrun clutch 18. Low one-way clutch
19. Low & reverse brake 20. Parking pawl 21. Parking gear
22. Output shaft 23. Idle gear 24. Output gear
SAT998I
Clutch and brake components Abbr. Function
5 Reverse clutch R/C To transmit input power to front sun gear 7 .
6 High clutch H/C To transmit input power to front planetary carrier 10 .
15 Forward clutch F/C To connect front planetary carrier 10 with forward one-way clutch 16 .
17 Overrun clutch O/C To connect front planetary carrier 10 with rear internal gear 13 .
4 Brake band B/B To lock front sun gear 7 .
16 Forward one-way clutch F/O.C When forward clutch 15 is engaged, to stop rear internal gear 13 from rotatin g in
opposite direction against engine revolution.
18 Low one-way clutch L/O.C To stop front planetary carrier 10 from rotating in opposite direction against
engine revolution.
19 Low & reverse brake L & R/B To lock front planetary carrier 10 .
Shift posi-
tionReverse
clutch
5High
clutch
6For-
ward
clutch
15Over-
run
clutch
17Band servo
Forward
one-way
clutch
16Low
one-
way
clutch
18Low &
revers
e brake
19Lock-
upRemarks
2nd
apply3rd
release4th
apply
PPA R K
POSITION
RREVERSE
POSITION
NNEUTRAL
POSITION

OVERALL SYSTEM
AT-19
D
E
F
G
H
I
J
K
L
MA
B
AT
●*1: Operates when overdrive control switch is set in “OFF” position.
●*2: Oil pressure is applied to both 2nd “apply” side and 3rd “release” side of band servo piston. However, brake band does not con-
tract because oil pressure area on the “release” side is greater than that on the “apply” side.
●*3: Oil pressure is applied to 4th “apply” side in condition *2 above, and brake band contracts.
●*4: A/T will not shift to 4th when overdrive control switch is set in “OFF” position.
●*5: Operates when overdrive control switch is “OFF”.
●: Operates.
●A: Operates when throttle opening is less than 3/16, activating engine brake.
●B: Operates during “progressive” acceleration.
●C: Operates but does not affect power transmission.
●D: Operates when throttle opening is less than 3/16, but does not affect engine brake. D*41st *1D B B
Automatic
shift
1⇔ 2 ⇔ 3
⇔ 4 2nd *1A B
3rd *1A *2C C B
*5
4th C *3C C
21st D B BAutomatic
shift
1⇔ 2 2nd A B
11stBLocks (held
stationary) in
1st speed
1⇐ 2 2ndB Shift posi-
tionReverse
clutch
5High
clutch
6For-
ward
clutch
15Over-
run
clutch
17Band servo
Forward
one-way
clutch
16Low
one-
way
clutch
18Low &
revers
e brake
19Lock-
upRemarks
2nd
apply3rd
release4th
apply

AT-20
OVERALL SYSTEM
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.
SAT991I

OVERALL SYSTEM
AT-21
D
E
F
G
H
I
J
K
L
MA
B
AT
“11 ” Position
●Forward clutch
●Forward one-way clutch
●Overrun clutch
●Low and reverse brakeAs overrun clutch engages, rear internal gear is locked by the operation of low &
reverse brake.
This is different from that of D
1 and 21 .
Engine brake Overrun clutch always engages, therefore engine brake can be obtained when deceler-
ating.
SAT374J

AT-22
OVERALL SYSTEM
“D1 ” and “21 ” Positions
●Forward one-way clutch
●Forward clutch
●Low one-way clutchRear internal gear is locked to rotate counterclockwise because of the functioning of
these three clutches.
Overrun clutch
engagement conditions
(Engine brake)D
1 : Overdrive control switch “OFF” and throttle opening is less than 3/16
2
1 : Operates when throttle opening is less than 3/16, but does not affect engine brake.
At D
1 and 21 positions, engine brake is not activated due to free turning of low one-
way clutch.
SAT377J

OVERALL SYSTEM
AT-23
D
E
F
G
H
I
J
K
L
MA
B
AT
“D2 ”, “22 ” and “12 ” Positions
●Forward clutch
●Forward one-way
clutch
●Brake bandRear 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 conditionsD
2 : Overdrive control switch “OFF” and throttle opening is less than 3/16
2
2: Operates when throttle opening is less than 3/16, but does not affect engine brake.
1
2 : Always engaged
SAT378J

AT-24
OVERALL SYSTEM
“D3 ” Position
●High clutch
●Forward clutch
●Forward one-way
clutchInput power is transmitted to front planetary carrier through high clutch. And front planetary carrier is con-
nected 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 conditionsD
3 : Overdrive control switch “OFF” and throttle opening is less than 3/16
SAT379J