2008 NISSAN TEANA engine

HYDRAULIC CONTROL SYSTEM
TM-21
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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N
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P 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:0000000003848926
*1: Primary pressure sensor is included in CVT assembly.
*2: Control valve assembly is included in CVT assembly.
NOTE:
The following components are included in control valve assembly (7).
PNP switch
1. Sport mode switch 2. Shift position indicator 3. SPORT indicator lamp
4.
TCM5. Secondary speed sensor 6.
Primary pressure sensor
*1
7.
Control valve assembly*28. CVT unit connector 9. Accelerator pedal position sensor
A. Control device B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0747ZZ

CONTROL SYSTEM
TM-23
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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CONTROL SYSTEM
System DiagramINFOID:0000000003848928
System DescriptionINFOID:0000000003848929
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
JPDIA0809GB
SENSORS (or SIGNAL)
⇒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
Primary pressure 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 diagnosisStep motor
Torque converter clutch solenoid
valve
Lock-up select solenoid valve
Line pressure solenoid valve
Secondary pressure solenoid valve
SPORT indicator lamp
Shift position indicator
Stater relay

TM-24
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
CONTROL SYSTEM
 *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 con-
trolLock-up
controlCAN com-
munica-
tion controlFail-safe
function
*3
InputPNP switch XXXXXX
Accelerator pedal position signal
*1XXXXXX
Closed throttle position signal
*1X XXX
Engine speed signal
*1XX XXX
CVT fluid temperature sensor X X X X X
Sport mode switch signal
*1X XXX
Stop lamp switch signal
*1X XXX
Primary speed sensor X XXXX
Secondary speed sensor XXXXXX
Primary pressure sensor X X
Secondary pressure sensor X X X
TCM power supply voltage signal XXXXXX
OutputSte p m ot or 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

CONTROL SYSTEM
TM-25
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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P
Component Parts LocationINFOID:0000000003848930
*1: Primary pressure sensor is included in CVT assembly.
*2: Control valve assembly is included in CVT assembly.
NOTE:
The following components are included in control valve assembly (7).
PNP switch
 Primary speed sensor
 Step motor
 Secondary pressure solenoid valve
 Line pressure solenoid valve
 Torque converter clutch solenoid valve
 Shift control valve
 Secondary valve
 Manual valve
 Lock-up select solenoid valve
1. Sport mode switch 2. Shift position indicator 3. SPORT indicator lamp
4.
TCM5. Secondary speed sensor 6.
Primary pressure sensor
*1
7.
Control valve assembly*28. CVT unit connector 9. Accelerator pedal position sensor
A. Control device B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0747ZZ

LOCK-UP AND SELECT CONTROL SYSTEM
TM-27
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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LOCK-UP AND SELECT CONTROL SYSTEM
System DiagramINFOID:0000000003848932
System DescriptionINFOID:0000000003848933
 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

TM-28
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
LOCK-UP AND SELECT CONTROL SYSTEM
Component Parts Location
INFOID:0000000003848934
*1: Primary pressure sensor is included in CVT assembly.
*2: Control valve assembly is included in CVT assembly.
NOTE:
The following components are included in control valve assembly (7).
 PNP switch
 Primary speed sensor
 Step motor
 Secondary pressure solenoid valve
 Line pressure solenoid valve
 Torque converter clutch solenoid valve
 Shift control valve
 Secondary valve
 Manual valve
 Lock-up select solenoid valve
1. Sport mode switch 2. Shift position indicator 3. SPORT indicator lamp
4.
TCM5. Secondary speed sensor 6.
Primary pressure sensor
*1
7.
Control valve assembly*28. CVT unit connector 9. Accelerator pedal position sensor
A. Control device B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0747ZZ

TM-30
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
SHIFT CONTROL SYSTEM
SHIFT CONTROL SYSTEM
System DiagramINFOID:0000000003848936
NOTE:
The gear ratio is set for each position separately.
System DescriptionINFOID:0000000003848937
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,
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 improved engine braking.
“L” POSITION
JPDIA0745GB
SCIA1953E
JPDIA0685GB

SHIFT CONTROL SYSTEM
TM-31
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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By limiting the 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.
ACCELERATION CONTROL
According to vehicle speed and a change of accelerator pedal angle, driver's request for acceleration and driv-
ing scene are judged. This function assists improvement in the acceleration feeling by making the engine
speed proportionate to the vehicle speed. And a shift map that can gain a larger driving force is available for
compatibility of mileage with driveability.
Component Parts LocationINFOID:0000000003848938
JPDIA0686GB
JPDIA0747ZZ