Infiniti QX56 (Z62). Manual - part 1285

SYSTEM

TM-49

< SYSTEM DESCRIPTION >

[7AT: RE7R01B]

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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

When the A/T fluid temperature drops below the prescribed tempera-
ture, in order to speed up the action of each friction element, the line
pressure is set higher than the normal line pressure characteristic.

SHIFT CHANGE CONTROL

PCIA0009E

PCIA0010E

PCIA0011E

TM-50

< SYSTEM DESCRIPTION >

[7AT: RE7R01B]

SYSTEM

SHIFT CHANGE CONTROL : System Diagram

INFOID:0000000006226773

SHIFT CHANGE CONTROL : System Description

INFOID:0000000006226774

Input/Output Signal Chart

Item

Signal

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*

JSDIA1659GB

SYSTEM

TM-51

< SYSTEM DESCRIPTION >

[7AT: RE7R01B]

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*: This signal is transmitted via communication line.

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

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

TM-52

< SYSTEM DESCRIPTION >

[7AT: RE7R01B]

SYSTEM

• 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

IDLE NEUTRAL CONTROL

JSDIA0815GB

JSDIA0817GB