Infiniti FX35, FX50 (S51). Manual - part 1848

SHIFT CHANGE CONTROL

TM-199

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

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SHIFT CHANGE CONTROL

System Diagram

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System Description

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INPUT/OUTPUT SIGNAL CHART

*: This signal is transmitted via CAN communication line.

SYSTEM DESCRIPTION

The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the
clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes

JSDIA1346GB

Sensor

Input signal to TCM

TCM function

Actuator

Input speed sensor 1, 2

Input speed

Shift change control

• High and low reverse 

clutch solenoid valve

• Direct clutch solenoid 

valve

• Input clutch solenoid valve
• Low brake solenoid valve
• 2346 brake solenoid valve
• Front brake solenoid valve
• Torque converter clutch so-

lenoid valve

• Line pressure solenoid 

valve

• Anti-interlock solenoid 

valve

Output speed sensor

Vehicle speed

A/T fluid temperature sensor

ATF temperature

ECM

Engine speed signal*

Accelerator pedal position signal*

Closed throttle position signal*

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

BCM

Stop lamp switch signal*

TM-200

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

SHIFT CHANGE CONTROL

possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change charac-
teristic is attained.

Shift Change

The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque informa-
tion, etc.

Shift Change System Diagram

*1: Full phase real-time feedback control monitors movement of gear ratio at gear change, and controls oil
pressure in real-time to achieve the best gear ratio.

Blipping Control

This system makes transmission clutch engage readily by controlling (synchronizing) engine revolution
according to the (calculation of) engine revolution after shifting down.
• “BLIPPING CONTROL” functions.
- When downshifting by accelerator pedal depression.
- When downshifting by the manual mode.

PCIA0012E

PCIA0013E

JSDIA0826GB

SHIFT CHANGE CONTROL

TM-201

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

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• TCM selects “BLIPPING CONTROL” or “NORMAL SHIFT CONTROL” according to the gear position, the

selector lever position, the engine torque and the speed when accelerating by pedal depression.

• Engine speed control demand signal is transmitted from TCM to ECM under “BLIPPING CONTROL”.
• ECM synchronizes the engine speed according to the engine speed control demand signal.

Downshifting by accelerator pedal depression

Downshifting by the manual mode

JSDIA0815GB

JSDIA0817GB

TM-202

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

SHIFT CHANGE CONTROL

Component Parts Location

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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

1.

Selector lever position indicator

2.

A/T shift selector assembly

3.

A/T assembly connector

4.

Control valve with TCM

*1

5.

Accelerator pedal position sensor

6.

Manual mode indicator

7.

Shift position indicator

8.

A/T CHECK indicator lamp

9.

Paddle shifter (shift-down)

*2

10. Paddle shifter (shift-up)

*2

A.

Center console

B.

A/T assembly

C.

Accelerator pedal

D.

Combination meter

E.

Steering wheel

JSDIA0787ZZ