Nissan Silvia. Instruction — part 6
“D
3
” Position
=NMAT0012S0404
High clutch
Forward clutch
Forward one-way clutch
Input power is transmitted to front planetary carrier through high clutch. And front plan-
etary carrier is connected 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 conditions
D
3
: Overdrive control switch in “OFF”
Throttle opening less than 3/16
SAT098J
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-21
“D
4
” (OD) Position
=NMAT0012S0405
High clutch
Brake band
Forward clutch
(Does not affect power transmission)
Input power is transmitted to front carrier through high clutch.
This front planetary carrier turns around the sun gear which is fixed by brake band and
makes front internal gear (output) turn faster.
Engine brake
At D
4
position, there is no one-way clutch in the power transmission line and engine
brake can be obtained when decelerating.
SAT099J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-22
“R” Position
=NMAT0012S0407
Reverse clutch
Low and reverse brake
Front 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 brake
As there is no one-way clutch in the power transmission line, engine brake can be
obtained when decelerating.
SAT101J
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-23
Control System
=NMAT0013
OUTLINE
NMAT0013S01
The automatic transmission senses vehicle operating conditions through various sensors. It always controls
the optimum shift position and reduces shifting and lock-up shocks.
SENSORS
E
TCM
E
ACTUATORS
PNP switch
Throttle position sensor
Closed throttle position switch
Wide open throttle position
switch
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed sensor
Overdrive control switch
A/T mode switch
Shift control
Line pressure control
Lock-up control
Overrun clutch control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication
line
Duet-EA control
Shift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch sole-
noid valve
Line pressure solenoid valve
O/D OFF indicator lamp
POWER indicator lamp
CONTROL SYSTEM
NMAT0013S02
SAT406K
OVERALL SYSTEM
Control System
AT-24
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