Infiniti F50. Instruction - page 35
A/T CONTROL SYSTEM
AT-25
D
E
F
G
H
I
J
K
L
M
A
B
AT
“D”, “M4”, “M5” positions 4th gear
●
The direct clutch is coupled, and the rear carrier and rear sun gear are connected.
●
The high and low reverse clutch is coupled and the mid sun gear and rear sun gear are connected.
●
The input clutch is coupled and the front internal gear and mid internal gear are connected.
●
The drive power is conveyed to the front internal gear, mid internal gear, and rear carrier and the three
planetary gears rotate forward as one unit.
1.
Front brake
2.
Input clutch
3.
Direct clutch
4.
High and low reverse clutch
5.
Reverse brake
6.
Forward brake
7.
Low coast brake
8.
1st one-way clutch
9.
Forward one-way clutch
10. 3rd one-way clutch
11.
Front sun gear
12. Input shaft
13. Mid internal gear
14. Front internal gear
15. Rear carrier
16. Rear sun gear
17. Mid sun gear
18. Front carrier
19. Mid carrier
20. Rear internal gear
21. Output shaft
22. Parking gear
23. Parking pawl
SCIA1517E
AT-26
A/T CONTROL SYSTEM
“D”, “M5” positions 5th gear
●
The front brake fastens the front sun gear.
●
The input clutch is coupled and the front internal gear and mid internal gear are connected.
●
The high and low reverse clutch is coupled and the mid sun gear and rear sun gear are connected.
1.
Front brake
2.
Input clutch
3.
Direct clutch
4.
High and low reverse clutch
5.
Reverse brake
6.
Forward brake
7.
Low coast brake
8.
1st one-way clutch
9.
Forward one-way clutch
10. 3rd one-way clutch
11.
Front sun gear
12. Input shaft
13. Mid internal gear
14. Front internal gear
15. Rear carrier
16. Rear sun gear
17. Mid sun gear
18. Front carrier
19. Mid carrier
20. Rear internal gear
21. Output shaft
22. Parking gear
23. Parking pawl
SCIA1518E
A/T CONTROL SYSTEM
AT-27
D
E
F
G
H
I
J
K
L
M
A
B
AT
“R” position
●
The front brake fastens the front sun gear.
●
The high and low reverse clutch is coupled and the mid sun gear and rear sun gear are connected.
●
The reverse brake fastens the rear carrier.
1.
Front brake
2.
Input clutch
3.
Direct clutch
4.
High and low reverse clutch
5.
Reverse brake
6.
Forward brake
7.
Low coast brake
8.
1st one-way clutch
9.
Forward one-way clutch
10. 3rd one-way clutch
11.
Front sun gear
12. Input shaft
13. Mid internal gear
14. Front internal gear
15. Rear carrier
16. Rear sun gear
17. Mid sun gear
18. Front carrier
19. Mid carrier
20. Rear internal gear
21. Output shaft
22. Parking gear
23. Parking pawl
SCIA1519E
AT-28
A/T CONTROL SYSTEM
TCM Function
ECS0082Q
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 transmission 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
SENSORS (or SIGNAL)
Þ
TCM
Þ
ACTUATORS
PNP switch
Throttle position sensor
Accelerator pedal position sensor
Closed throttle position signal
Wide-open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed sensor
Manual mode switch signal
Stop lamp switch signal
Turbine revolution sensor
Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
Duet-EA control
CAN system
Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High & low reverse clutch sole-
noid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
SCIA1329E