Nissan Maxima. Instruction — part 1139
TM-20
< SYSTEM DESCRIPTION >
[CVT: RE0F09B]
HYDRAULIC CONTROL SYSTEM
Normal Control
Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throt-
tle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revo-
lution speed, the brake signal, the transmission range switch signal, the lock-up signal, the voltage, the target
gear ratio, the fluid temperature, and the fluid pressure.
Feedback Control
For the normal fluid control and the select fluid control, secondary pressure is detected for feedback control by
using a secondary pressure sensor to set a high-precision secondary pressure.
HYDRAULIC CONTROL SYSTEM
TM-21
< SYSTEM DESCRIPTION >
[CVT: RE0F09B]
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Component Parts Location
INFOID:0000000009469024
1.
CVT shift selector assembly (Instruction
mode select switch and instruction
mode position select switch)
2.
Secondary speed sensor
3.
CVT unit harness connector
AWDIA1036ZZ
TM-22
< SYSTEM DESCRIPTION >
[CVT: RE0F09B]
HYDRAULIC CONTROL SYSTEM
Component Description
INFOID:0000000010113301
TRANSAXLE ASSEMBLY
EXCEPT TRANSAXLE ASSEMBLY
4.
TCM
5.
Accelerator pedal position (APP)
sensor
6.
Stop lamp switch
7.
Shift positioner indicator
Instruction mode indicator
DS mode indicator
8.
Paddle shifters
Name
Function
Torque converter regulator valve
Optimizes the supply pressure for the torque converter depending on driving conditions.
Pressure regulator valve
Optimizes the discharge pressure from the oil pump depending on driving conditions.
TCC control valve
• Activates or deactivates the lock-up.
• Locks up smoothly by opening lock-up operation excessively.
Shift control valve
Controls inflow/outflow of line pressure from the primary pulley depending on the stroke
difference between the stepping motor and the primary pulley.
Secondary valve
Controls the line pressure from the secondary pulley depending on operating conditions.
Clutch regulator valve
Adjusts the clutch operating pressure depending on operating conditions.
Instruction valve
Transmits the clutch operating pressure to each circuit in accordance with the selected
position.
Select control valve
Engages forward clutch, reverse brake smoothly depending on select operation.
Select switch valve
The select switch valve enables to select engagement/disengagement of lock-up clutch
and that of forward clutch and reverse clutch.
TCC solenoid valve
Secondary pressure solenoid valve
Line pressure solenoid valve
Step motor
Lock-up select solenoid valve
Primary speed sensor
Secondary speed sensor
Transmission range switch
Primary pulley
Secondary pulley
Forward clutch
Torque converter
Name
Function
TCM
Judges driving condition according to signals from each sensor, and optimally controls
variable speed mechanism.
Accelerator pedal position sensor
CONTROL SYSTEM
TM-23
< SYSTEM DESCRIPTION >
[CVT: RE0F09B]
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CONTROL SYSTEM
System Diagram
INFOID:0000000010113439
System Description
INFOID:0000000010113440
The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift
position and reduces shifting and lock-up shocks.
TCM FUNCTION
The function of the TCM is to:
• Receive input signals sent from various switches and sensors.
• Determine required line pressure, shifting point, and lock-up operation.
• Send required output signals to the step motor and the respective solenoids.
*: With paddle shifter
INPUT/OUTPUT SIGNAL OF TCM
AWDIA0739GB
SENSORS (or SIGNAL)
⇒
TCM
⇒
ACTUATORS
Transmission range switch
Accelerator pedal position signal
Closed throttle position signal
Engine speed signal
CVT fluid temperature sensor
Vehicle speed signal
Instruction mode signal
Paddle shifter signal
*
Stop lamp switch signal
Primary speed sensor
Secondary speed sensor
Primary pressure sensor
Secondary pressure sensor
Shift control
Line pressure control
Primary pressure control
Secondary pressure control
Lock-up control
Engine brake control
Vehicle speed control
Fail-safe control
Self-diagnosis
CONSULT communication line
Duet-EA control
CAN system
On board diagnosis
Step motor
Torque converter clutch solenoid
valve
Lock-up select solenoid valve
Line pressure solenoid valve
Secondary pressure solenoid valve
Instruction mode indicator
Shift position indicator
Starter relay
DS mode indicator
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