Infiniti FX35, FX50 (S51). Manual - part 1801

A/T CONTROL SYSTEM

TM-11

< SYSTEM DESCRIPTION >

[7AT: RE7R01A (VQ35HR)]

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Component Parts Location

INFOID:0000000005249992

NOTE:

• The following components are included in A/T shift selector assembly.

- Manual mode select switch

- Manual mode position select switch

- Shift position switch

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

- TCM

- Input speed sensor 1, 2

- Output speed sensor

1.

Selector lever position indicator

2.

A/T shift selector assembly

3.

A/T assembly connector

4.

Control valve with TCM*

5.

Accelerator pedal position sensor

6.

Manual mode indicator

7.

Shift position indicator

8.

A/T CHECK indicator lamp

A.

Center console

B.

A/T assembly

C.

Accelerator pedal

D.

Combination meter

JSDIA0782ZZ

TM-12

< SYSTEM DESCRIPTION >

[7AT: RE7R01A (VQ35HR)]

A/T CONTROL SYSTEM

- A/T fluid temperature sensor

- Transmission range switch

- Direct clutch solenoid valve

- High and low reverse clutch solenoid valve

- Input clutch solenoid valve

- Front brake solenoid valve

- Low brake solenoid valve

- Anti-interlock solenoid valve

- 2346 brake solenoid valve

- Line pressure solenoid valve

- Torque converter clutch solenoid valve

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

Component Description

INFOID:0000000005249993

Name

Function

TCM

The TCM consists of a microcomputer and connectors for signal input and output and 
for power supply. The TCM controls the A/T.

Transmission range switch

TM-71, "Description"

Output speed sensor

TM-76, "Description"

Input speed sensor 1

TM-74, "Description"

Input speed sensor 2

A/T fluid temperature sensor

TM-72, "Description"

Input clutch solenoid valve

TM-100, "Description"

Front brake solenoid valve

TM-102, "Description"

Direct clutch solenoid valve

TM-117, "Description"

High and low reverse clutch solenoid valve

TM-114, "Description"

Low brake solenoid valve

TM-115, "Description"

Anti-interlock solenoid valve

TM-98, "Description"

2346 brake solenoid valve

TM-116, "Description"

Line pressure solenoid valve

TM-97, "Description"

Torque converter clutch solenoid valve

TM-94, "Description"

Accelerator pedal position sensor

TM-103, "Description"

Manual mode switch

TM-111, "Description"

Starter relay

TM-69, "Description"

A/T CHECK indicator lamp

When the ignition switch is pushed to the ON position, the light comes on for 2 seconds.

Stop lamp switch

TM-122, "Description"

ECM

EC-30, "System Description"

BCM

BCS-6, "System Description"

Unified meter and A/C amp.

MWI-6, "METER SYSTEM : System Description"

ABS actuator and electric unit (control unit)

BRC-29, "System Description"

Yaw rate/side G sensor

BRC-77, "Description"

LINE PRESSURE CONTROL

TM-13

< SYSTEM DESCRIPTION >

[7AT: RE7R01A (VQ35HR)]

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LINE PRESSURE CONTROL

System Diagram

INFOID:0000000005249994

System Description

INFOID:0000000005249995

INPUT/OUTPUT SIGNAL CHART

*: This signal is transmitted via CAN communication line.

SYSTEM DESCRIPTION

• When an engine and A/T integrated control signal (engine torque) equivalent to the engine drive force is

transmitted from the ECM to the TCM, the TCM controls the line pressure solenoid valve.
This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pres-
sure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving
state.

• The TCM has stored in memory a number of patterns for the optimum line pressure characteristic for the

driving state.

• In order to obtain the most appropriate line pressure characteristic to meet the current driving state, the TCM

controls the line pressure solenoid current value and thus controls the line pressure.

Normal Control

JSDIA1345GB

Sensor

Input signal to TCM

TCM function

Actuator

Input speed sensor 1, 2

Input speed

Line pressure control

Line pressure solenoid valve

↓

Pressure regulator valve

Output speed sensor

Vehicle speed

A/T fluid temperature sensor

ATF temperature

ECM

Engine speed signal*

Accelerator pedal position signal*

Engine and A/T integrated control signal
(Engine torque)*

TM-14

< SYSTEM DESCRIPTION >

[7AT: RE7R01A (VQ35HR)]

LINE PRESSURE CONTROL

Each clutch is adjusted to the necessary pressure to match the
engine drive force.

Back-up Control (Engine Brake)

When the select operation is performed during driving and the A/T is
shifted down, the line pressure is set according to the vehicle speed.

During Shift Change

The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting corresponds to engine
torque and gearshift selection. Also, line pressure characteristic cor-
responds to engine speed, during engine brake operation.

At Low Fluid Temperature

PCIA0008E

PCIA0009E

PCIA0010E