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

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