Infiniti G37 Coupe. Manual - part 1308

 

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Infiniti G37 Coupe. Manual - part 1308

 

 

A/T CONTROL SYSTEM

TM-85

< FUNCTION DIAGNOSIS >

[5AT: RE5R05A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

- After switching to manual mode with paddle shifter, switching to DS mode can not be enabled even when the

selector lever is shifted to the manual gate. (With paddle shifter)

LOCK-UP CONTROL

The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve,
which is controlled by a signal from TCM, and the torque converter clutch control valve engages or releases
the torque converter clutch piston.

Lock-up operation condition table

Torque Converter Clutch Control Valve Control

Lock-up control system diagram

Lock-up Released

• In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the

torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.

Lock-up Applied

• In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the

torque converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.

Smooth Lock-up Control

When shifting from the lock-up released state to the lock-up applied state, the current output to the torque con-
verter clutch solenoid is controlled with the TCM. In this way, when shifting to the lock-up applied state, the
torque converter clutch is temporarily set to the half-clutched state to reduce the shock.

Half-clutched State

• The current output from the TCM to the torque converter clutch solenoid is varied to steadily increase the

torque converter clutch solenoid pressure.
In this way, the lock-up apply pressure gradually rises and while the torque converter clutch piston is put into
half-clutched states, the torque converter clutch piston operating pressure is increased and the coupling is
completed smoothly.

Slip Lock-up Control

• In the slip region, the torque converter clutch solenoid current is controlled with the TCM to put it into the

half-clutched state. This absorbs the engine torque fluctuation and lock-up operates from low speed.
This raises the fuel efficiency for 3rd, 4th and 5th gears at both low speed and when the accelerator has a
low degree of opening.

ENGINE BRAKE CONTROL

• The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse

drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling.
Therefore, the low coast brake solenoid is operated to prevent the forward one-way clutch from idling and
the engine brake is operated in the same manner as conventionally.

Selector lever

“D” position

“M” position

Gear  position

5

4

3

5

4

3

2

Lock-up

×

×

×

×

×

×

×

Slip lock-up

×

×

×

PCIA0014E

TM-86

< FUNCTION DIAGNOSIS >

[5AT: RE5R05A]

A/T CONTROL SYSTEM

• The operation of the low coast brake solenoid switches the low coast brake switching valve and controls the

coupling and releasing of the low coast brake.
The low coast brake reducing valve controls the low coast brake coupling force.

SCIA1520E

A/T CONTROL SYSTEM

TM-87

< FUNCTION DIAGNOSIS >

[5AT: RE5R05A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Component Parts Location

INFOID:0000000001672107

Without Paddle Shifter

*1: Control valve with TCM is included in A/T assembly.

NOTE:

• The following components are included in A/T control device (2).

- Manual mode select switch

- Manual mode position select switch

- Shift position switch

• The following components are included in control valve with TCM (8).

- TCM

- Turbine revolution sensor 1, 2

- Revolution sensor

- A/T fluid temperature sensor 1, 2

- PNP switch

- Line pressure solenoid valve

JPDIA0548ZZ

1.

Selector lever position indicator

2.

A/T control device

3.

Accelerator pedal position sensor

4.

Manual mode indicator

5.

Shift position indicator

6.

A/T CHECK indicator lamp

7.

A/T assembly harness connector

8.

Control valve with TCM

*1

A.

Center console

B.

Accelerator pedal

C.

Combination meter

D.

A/T assembly

TM-88

< FUNCTION DIAGNOSIS >

[5AT: RE5R05A]

A/T CONTROL SYSTEM

- Torque converter clutch solenoid valve

- Direct clutch solenoid valve

- High and low reverse clutch solenoid valve

- Input clutch solenoid valve

- Front brake solenoid valve

- Low coast brake solenoid valve

- ATF pressure switch 2

With Paddle Shifter

*1: Control valve with TCM is included in A/T assembly.

NOTE:

• The following components are included in A/T control device (4).

- Manual mode select switch

- Manual mode position select switch

- Shift position switch

• The following components are included in control valve with TCM (10).

JPDIA0549ZZ

1.

Paddle shifter (shift-down)

2.

Paddle shifter (shift-up)

3.

Selector lever position indicator

4.

A/T control device

5.

Accelerator pedal position sensor

6.

Manual mode indicator

7.

Shift position indicator

8.

A/T CHECK indicator lamp

9.

A/T assembly harness connector

10. Control valve with TCM

*1

A.

Steering wheel

B.

Center console

C.

Accelerator pedal

D.

Combination meter

E.

A/T assembly

 

 

 

 

 

 

 

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