NISSAN X-TRAIL 2003 Electronic Owner's Manual

OVERALL SYSTEM
AT-15
D
E
F
G
H
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K
L
MA
B
AT
SCIA0687E

AT-16
OVERALL SYSTEM
Circuit Diagram
ECS004QA
TCWA0035E

OVERALL SYSTEM
AT-17
D
E
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L
MA
B
AT
Cross-sectional ViewECS004QB
SCIA0688E
1. Band servo piston 9. Low one-way clutch 17. Pinion reduction gear
2. Reverse clutch drum 10. Rear planetary gear 18. Final gear
3. Converter housing 11. Forward clutch 19. Differential case
4. Oil pump 12. Overrun clutch 20. Input shaft
5. Brake band 13. Low & reverse brake 21. Torque converter
6. Reverse clutch 14. Output gear 22. Side cover
7. High clutch 15. Idler gear
8. Front planetary gear 16. Forward one-way clutch

AT-18
OVERALL SYSTEM
Hydraulic Control Circuit
ECS004QC
SCIA0689E

OVERALL SYSTEM
AT-19
D
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Shift MechanismECS004QD
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
5Reverse clutch R/C To transmit input power to front sun gear7.
6High clutch H/C To transmit input power to front planetary carrier10.
15Forward clutch F/C To connect front planetary carrier10with forward one-way clutch16.
17Overrun clutch O/C To connect front planetary carrier10with rear internal gear13.
4Brake band B/B To lock front sun gear7.
16Forward one-way clutch F/O.C When forward clutch15is engaged, to stop rear internal gear13from rotating in
opposite direction against engine revolution.
18Low one-way clutch L/O.C To stop front planetary carrier10from rotating in opposite direction against
engine revolution.
19Low & reverse brake L & R/B To lock front planetary carrier10.
Shift positionRever
se
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
releas
e4th
apply
PPA R K
POSITION
RREVERSE
POSITION

AT-20
OVERALL SYSTEM
l*1: Operates when overdrive control switch is set in “OFF” position.
l*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.
l*3: Oil pressure is applied to 4th “apply” side in condition *2 above, and brake band contracts.
l*4: A/T will not shift to 4th when overdrive control switch is set in “OFF” position.
l*5: Operates when overdrive control switch is “OFF”.
l:Operates.
lA: Operates when throttle opening is less than 3/16, activating engine brake.
lB: Operates during “progressive” acceleration.
lC: Operates but does not affect power transmission.
lD: Operates when throttle opening is less than 3/16, but does not affect engine brake.
POWER TRANSMISSION
“N” and “P” Positions
l“N” position
Power from the input shaft is not transmitted to the output shaft because the clutches do not operate.
l“P” position
NNEUTRAL
POSITION
D*41st *1D B B
Automatic
shift
1Û2Û3Û
4 2nd *1A B
3rd *1A *2C C B
*5
4th C *3C C
21st D B BAutomatic
shift
1Û2 2nd A B
11stBLocks (held
stationary) in
1st speed
1Ü2 2ndB Shift positionRever
se
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
releas
e4th
apply

OVERALL SYSTEM
AT-21
D
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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

AT-22
OVERALL SYSTEM
“11”Position
“D
1”and“21” Positions
lForward clutch
lForward one-way clutch
lOverrun clutch
lLow and reverse brakeAs overrun clutch engages, rear internal gear is locked by the operation of low and
reverse brake.
This is different from that of D
1and 21.
Engine brake Overrun clutch always engages, therefore engine brake can be obtained when deceler-
ating.
SAT374J
lForward one-way clutch
lForward clutch
lLow 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: Always engaged
At D
1and 21positions, engine brake is not activated due to free turning of low one-
way clutch.

OVERALL SYSTEM
AT-23
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“D2”, “22”and“12” Positions
SAT377J
lForward clutch
lForward one-way
clutch
lBrake 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
2and 12: Always engaged

AT-24
OVERALL SYSTEM
“D3” Position
SAT378J
lHigh clutch
lForward clutch
lForward 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