2006 NISSAN VERSA clutch

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.
SCIA1816E

A/T CONTROL SYSTEM
AT-25
D
E
F
G
H
I
J
K
L
MA
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.
SAT3 7 7J

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
SAT3 7 8J

A/T CONTROL SYSTEM
AT-27
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: June 20062007 Versa
“D3 ”, “23 ” and “13 ” Positions
*: Overrun clutch remains in engaged condition when throttle opening is less than 1/16.

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 : OD OFF (OD OFF indicator lamp is on) and throttle opening is less than specification*
2
3 and 13 : Always engaged
SAT3 7 9J

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.
SAT3 8 0J

A/T CONTROL SYSTEM
AT-29
D
E
F
G
H
I
J
K
L
MA
B
AT
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.
SAT3 8 1J

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
SCIA7 112 E

A/T CONTROL SYSTEM
AT-31
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: June 20062007 Versa
CAN CommunicationUCS005M D
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-47,
"CAN System Specification Chart" .
Input/Output Signal of TCMUCS005M E
*1: Spare for vehicle speed sensor·A/T (revolution sensor)
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: Used as a condition for starting self-diagnostics; if self-diagnosis are not started, it is judged that there is some kind of error.
*5: Input by CAN communications.
*6: Output by CAN communications.Control itemLine
pressure
controlVehicle
speed
controlShift
controlLock-up
controlEngine
brake
controlFail-safe
functionSelf-diag-
nostics
function
InputAccelerator pedal position signal
(*5)XXXXX(*3) XX
Vehicle speed sensor·A/T
(Revolution sensor)XXXXX(*3) XX
Vehicle speed sensor·MTR (*1) X (*1) X (*1) X (*1) X X
Closed throttle position signal
(*5)(*2) X(*2) XXX(*4) X
Wide open throttle position signal
(*5)(*2) X (*2) X (*4) X
Turbine revolution sensor (Power
train revolution sensor)XX X XX
Engine speed signal X X X X
PNP switch X X X X X (*3) X (*4) X
Stop lamp switch signal
(*5)XX (*4) X
A/T fluid temperature sensors
(*5)XXXX XX
Overdrive control switch signal
(*5)XXXX (*4) X
TCM power supply voltage signal X X X X
Out-
putShift solenoid valve A/B X (*3) X X
Line pressure solenoid X (*3) X X
Torque converter clutch solenoid
valveX(*3) XX
Overrun clutch solenoid valve X X (*3) X X
OD OFF indicator lamp
(*6)XX