NISSAN TEANA 2008 Service Manual

TM-188
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
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 PNP 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.
Component Parts LocationINFOID:0000000003809652
*: Control valve assembly is included in CVT assembly.
NOTE:
The following components are included in control valve assembly (8).
 CVT fluid temperature sensor
1. Sport mode switch 2. Shift position indicator 3. SPORT indicator lamp
4. TCM 5. Secondary speed sensor 6. PNP switch
7. Primary speed sensor 8.
Control valve assembly
*9. CVT unit connector
10. Accelerator pedal position sensor
A. Center console B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0746ZZ

HYDRAULIC CONTROL SYSTEM
TM-189
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
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B
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N
O
P
 Torque converter clutch solenoid valve
 Line pressure solenoid valve
 Step motor
 ROM assembly
 Secondary pressure sensor
 Secondary pressure solenoid valve
 Lock-up select solenoid valve
Component DescriptionINFOID:0000000003806357
TRANSAXLE ASSEMBLY
EXCEPT TRANSAXLE ASSEMBLY
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 valveControls 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.
Manual valveTransmits 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 valveThe select switch valve enables to select engagement/disengagement of lock-up clutch
and that of forward clutch and reverse clutch.
TCC solenoid valveTM-230
Secondary pressure solenoid valveTM-240
Line pressure solenoid valveTM-234
Step motorTM-261
Lock-up select solenoid valveTM-258
Primary speed sensorTM-218
Secondary speed sensorTM-222
PNP switchTM-213
Primary pulley
TM-186
Secondary pulley
Forward clutch
Torque converter
Name Function
TCMJudges the vehicle driving status according to the signal from each sensor and controls
the non-step transmission mechanism properly.
Accelerator pedal position sensorTM-252

TM-190
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
CONTROL SYSTEM
CONTROL SYSTEM
System DiagramINFOID:0000000003806358
System DescriptionINFOID:0000000003806359
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.
INPUT/OUTPUT SIGNAL OF TCM
JPDIA0744GB
SENSORS (or SIGNALS)
⇒TCM
⇒ACTUATORS
PNP switch
Accelerator pedal position signal
Closed throttle position signal
Engine speed signal
CVT fluid temperature sensor
Vehicle speed signal
Sport mode switch signal
Stop lamp switch signal
Primary speed sensor
Secondary speed sensor
Secondary pressure sensorShift 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-III communication
line
Duet-EA control
CAN system
On board diagnosisSte p m ot or
Torque converter clutch solenoid
valve
Lock-up select solenoid valve
Line pressure solenoid valve
Secondary pressure solenoid
valve
SPORT indicator lamp
Shift position indicator

CONTROL SYSTEM
TM-191
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
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*1: Input via CAN communications.
*2: Output via CAN communications.
*3: If these input and output signals are different, the TCM triggers the fail-safe function.Control itemFluid
pressure
controlSelect con-
trolShift controlLock-up
controlCAN com-
munication
controlFail-safe
function
(*3)
InputPNP switch XXXXXX
Accelerator pedal position signal
*1XXXXXX
Closed throttle position signal
*1XXXX
Engine speed signal
*1XX XXX
CVT fluid temperature sensor X X X X X
Sport mode switch signal
*1XXXX
Stop lamp switch signal
*1XXXX
Primary speed sensor X X X X X
Secondary speed sensor X X X X X X
Secondary pressure sensor X X X
Out-
putSte p mo tor X X
TCC solenoid valve X X X
Lock-up select solenoid valve X X X
Line pressure solenoid valve X X X X
Secondary pressure solenoid valve X X X
SPORT indicator signal
*2XX

TM-192
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
CONTROL SYSTEM
Component Parts Location
INFOID:0000000003809653
*: Control valve assembly is included in CVT assembly.
NOTE:
The following components are included in control valve assembly (8).
 CVT fluid temperature sensor
 Torque converter clutch solenoid valve
 Line pressure solenoid valve
 Step motor
ROM assembly
 Secondary pressure sensor
 Secondary pressure solenoid valve
 Lock-up select solenoid valve
1. Sport mode switch 2. Shift position indicator 3. SPORT indicator lamp
4. TCM 5. Secondary speed sensor 6. PNP switch
7. Primary speed sensor 8.
Control valve assembly
*9. CVT unit connector
10. Accelerator pedal position sensor
A. Center console B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0746ZZ

CONTROL SYSTEM
TM-193
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
C
E
F
G
H
I
J
K
L
MA
B
TM
N
O
P
Component DescriptionINFOID:0000000003806361
TRANSAXLE ASSEMBLY
EXCEPT TRANSAXLE ASSEMBLY
Name Function
PNP switchTM-213
CVT fluid temperature sensorTM-216
Primary speed sensorTM-218
Secondary speed sensorTM-222
Secondary pressure sensorTM-242
Step motorTM-261
TCC solenoid valveTM-230
Lock-up select solenoid valveTM-258
Line pressure solenoid valveTM-234
Secondary pressure solenoid valveTM-240
Name Function
TCMOptimally controls continuously variable transmission system by judging driving condi-
tions based on signals from each sensor.
Stop lamp switchTM-210

TM-194
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
LOCK-UP AND SELECT CONTROL SYSTEM
LOCK-UP AND SELECT CONTROL SYSTEM
System DiagramINFOID:0000000003806362
System DescriptionINFOID:0000000003806363
 The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
 The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid
valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or
releases the torque converter clutch piston.
 When shifting between “N” (“P”) ⇔“D” (“R”), torque converter clutch solenoid valve controls engagement
power of forward clutch and reverse brake.
 The lock-up applied gear range was expanded by locking up the
torque converter at a lower vehicle speed than conventional CVT
models.
TORQUE CONVERTER CLUTCH AND SELECT CONTROL VALVE CONTROL
Lock-up Released
In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid valve and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
Lock-up Applied
In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque
converter clutch solenoid valve and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.
Select Control
When shifting between “N” (“P”) ⇔“D” (“R”), optimize the operating pressure on the basis of the throttle posi-
tion, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.
SCIA2374E
JPDIA0312GB

LOCK-UP AND SELECT CONTROL SYSTEM
TM-195
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
C
E
F
G
H
I
J
K
L
MA
B
TM
N
O
P
Component Parts LocationINFOID:0000000003809654
*: Control valve assembly is included in CVT assembly.
NOTE:
The following components are included in control valve assembly (8).
 CVT fluid temperature sensor
 Torque converter clutch solenoid valve
 Line pressure solenoid valve
 Step motor
 ROM assembly
 Secondary pressure sensor
 Secondary pressure solenoid valve
 Lock-up select solenoid valve
1. Sport mode switch 2. Shift position indicator 3. SPORT indicator lamp
4. TCM 5. Secondary speed sensor 6. PNP switch
7. Primary speed sensor 8.
Control valve assembly
*9. CVT unit connector
10. Accelerator pedal position sensor
A. Center console B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0746ZZ

TM-196
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
LOCK-UP AND SELECT CONTROL SYSTEM
Component Description
INFOID:0000000003806365
TRANSAXLE ASSEMBLY
EXCEPT TRANSAXLE ASSEMBLY
Name Function
Torque converter regulator valve
TM-189
TCC control valve
Select control valve
Select switch valve
Manual valve
TCC solenoid valveTM-230
Lock-up select solenoid valveTM-258
Primary speed sensorTM-218
Secondary speed sensorTM-222
CVT fluid temperature sensorTM-216
PNP switchTM-213
Forward clutch
TM-186
Reverse brake
Torque converter
Name Function
TCMTM-193
Accelerator pedal position sensorTM-252

SHIFT CONTROL SYSTEM
TM-197
< FUNCTION DIAGNOSIS >[CVT: RE0F10A]
C
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B
TM
N
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SHIFT CONTROL SYSTEM
System DiagramINFOID:0000000003806366
NOTE:
The gear ratio is set for each position separately.
System DescriptionINFOID:0000000003806367
In order to select the gear ratio that can obtain the driving force in accordance with driver's intention and the
vehicle condition, TCM monitors the driving conditions, such as the vehicle speed and the throttle position and
selects the optimum gear ratio, and determines the gear change steps to the gear ratio. Then TCM sends the
command to the step motor, controls the inflow/outflow of line pressure from the primary pulley to determine
the position of the moving-pulley and controls the gear ratio.
“D” POSITION
Shifting over all the ranges of gear ratios from the lowest to the high-
est.
SPORT MODE
Use this position for the improved engine braking.
“L” POSITION
By limiting gear range to the lowest position, the strong driving force
and the engine brake can be secured.
DOWNHILL ENGINE BRAKE CONTROL (AUTO ENGINE BRAKE CONTROL)
When a downhill slope is detected with the accelerator pedal released, the engine brake will be strengthened
up by downshifting so as not to accelerate the vehicle more than necessary.
JPDIA0745GB
SCIA1953E
SCIA1955E