Infiniti FX35, FX50 (S51). Manual — part 1847
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LINE PRESSURE CONTROL
TM-195
< SYSTEM DESCRIPTION >
[7AT: RE7R01B (VK50VE)]
C
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G
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A
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TM
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LINE PRESSURE CONTROL
System Diagram
INFOID:0000000005250191
System Description
INFOID:0000000005250192
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)*
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TM-196
< SYSTEM DESCRIPTION >
[7AT: RE7R01B (VK50VE)]
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
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LINE PRESSURE CONTROL
TM-197
< SYSTEM DESCRIPTION >
[7AT: RE7R01B (VK50VE)]
C
E
F
G
H
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K
L
M
A
B
TM
N
O
P
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.
Component Parts Location
INFOID:0000000005520211
PCIA0011E
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
JSDIA0787ZZ
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TM-198
< SYSTEM DESCRIPTION >
[7AT: RE7R01B (VK50VE)]
LINE PRESSURE CONTROL
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
- 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
*1: Control valve with TCM is included in A/T assembly.
*2: With paddle shifter
Component Description
INFOID:0000000005250194
10. Paddle shifter (shift-up)
*2
A.
Center console
B.
A/T assembly
C.
Accelerator pedal
D.
Combination meter
E.
Steering wheel
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.
Output speed sensor
Input speed sensor 1
Input speed sensor 2
A/T fluid temperature sensor
Line pressure solenoid valve
Pressure regulator valve
Adjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
ECM
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