2006 NISSAN VERSA brake

A/T CONTROL SYSTEM
AT-21
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: June 20062007 Versa
Shift MechanismUCS005M B
CONSTRUCTION
FUNCTION OF CLUTCH AND BRAKE
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
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Clutch and brake components Abbr. Function
5Reverse clutch R/C To transmit input power to front sun gear 7 .
6High clutch H/C To transmit input power to front planetary carrier 10 .
15Forward clutch F/C To connect front planetary carrier 10 with forward one-way clutch 16 .
17Overrun clutch O/C To connect front planetary carrier 10 with rear internal gear 13 .
4Brake band B/B To lock front sun gear 7 .
16Forward one-way clutch F/O.CWhen forward clutch 15 is engaged, to stop rear internal gear 13 from rotating
in opposite direction against engine revolution.
18Low one-way clutch L/O.CTo stop front planetary carrier 10 from rotating in opposite direction against
engine revolution.
19Low & reverse brake L & R/B To lock front planetary carrier 10 .

AT-22
A/T CONTROL SYSTEM
Revision: June 20062007 Versa
CLUTCH AND BAND CHART

*1: Operates when OD OFF. (OD OFF indicator lamp is on.)

*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 on condition *2 above, and brake band contracts.

*4: A/T will not shift to 4th when OD OFF. (OD OFF indicator lamp is on.)

: Operates.

A: Operates when throttle opening is less than specification**, activating engine brake.

B: Operates during “progressive” acceleration.

C: Operates but does not affect power transmission.

D: Operates when throttle opening is less than specification**, but does not affect engine brake.
–**: Overrun clutch remains in engaged condition when throttle opening is less than 1/16. Shift posi-
tionR/C
5H/C
6F/C
15O/C
17Band servo
F/O.C
16L/O.C
18L&R/B
19Lock-
upRemarks
2nd
apply3rd
release4th
apply
PPA R K
POSITION
RREVERSE
POSITION
NNEUTRAL
POSITION
D*4 1st *1D B B
2nd *1A BAutomatic
shift
3rd *1A *2C C B
*11 ⇔ 2 ⇔ 3
⇔ 4
4th C *3C C
21stBB
Automatic
shift
1 ⇔ 2 ⇐ 3 2ndB
3rd *2C C B
11stBB
Locks (held
stationary)
in 1st speed
1 ⇐ 2 ⇐ 3 2ndB
3rd *2C C B

AT-24
A/T CONTROL SYSTEM
Revision: June 20062007 Versa
“11 ” Position

Forward clutch

Forward one-way clutch

Overrun clutch

Low & 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
1 and 21 .
Engine brake Overrun clutch always engages, therefore engine brake can be obtained when deceler-
ating.
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A/T CONTROL SYSTEM
AT-25
D
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B
AT
Revision: June 20062007 Versa
“D1 ” and “21 ” Positions
*: Overrun clutch remains in engaged condition when throttle opening is less than 1/16.

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 : OD OFF (OD OFF indicator lamp is on) and throttle opening is less than specification*
2
1 : Always engaged
At D
1 and 21 positions, engine brake is not activated due to free turning of low one- way clutch.
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AT-26
A/T CONTROL SYSTEM
Revision: June 20062007 Versa
“D2 ”, “22 ” and “12 ” Positions
*: Overrun clutch remains in engaged condition when throttle opening is less than 1/16.

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 : OD OFF (OD OFF indicator lamp is on) and throttle opening is less than specification*
2
2 and 12 : Always engaged
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AT-28
A/T CONTROL SYSTEM
Revision: June 20062007 Versa
“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 brakeAt D
4 position, there is no one-way clutch in the power transaxle line and engine
brake can be obtained when decelerating.
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A/T CONTROL SYSTEM
AT-29
D
E
F
G
H
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B
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Revision: June 20062007 Versa
“R” Position

Reverse clutch

Low & reverse brakeFront 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 brakeAs there is no one-way clutch in the power transaxle line, engine brake can be
obtained when decelerating.
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AT-30
A/T CONTROL SYSTEM
Revision: June 20062007 Versa
TCM FunctionUCS005MC
The function of the TCM is to:

Receive input signals sent from various switches and sensors.

Determine required line pressure, shifting point, lock-up operation, and engine brake operation.

Send required output signals to the respective solenoids.
CONTROL SYSTEM OUTLINE
The automatic transaxle senses vehicle operating conditions through various sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
CONTROL SYSTEM DIAGRAM
SWITCHES & SENSORS


TCM


ACTUATORS
PNP switch
Accelerator pedal position signal
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Turbine revolution sensor (Power
train revolution sensor)
Vehicle speed sensor
Overdrive control switch signal
Stop lamp switch signalShift control
Line pressure control
Lock-up control
Overrun clutch control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
controlShift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
OD OFF indicator lamp
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