cvt NISSAN TEANA 2008 Repair Manual

TM-12
< BASIC INSPECTION >[CVT: RE0F09B]
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Precaution for TCM
and CVT Assembly Replacement
INFOID:0000000003848916
CAUTION:
• Check if new data (Unit ID) are entered correctly after replacing CVT assembly and erasing data in
TCM. (Connect CONSULT-III, and then turn ignition switch OFF.)
 When replacing CVT assembly or TCM, refer to the pattern table below and erase the EEPROM in the
TCM if necessary.
EEPROM ERASING PATTERNS
METHOD FOR ERASING THE EEPROM IN THE TCM
1. Turn ignition switch ON.
2. Move selector lever to “R” position.
3. Perform “Self-Diagnostic Results” mode for “TRANSMISSION”.
4. Press the brake pedal and turn the brake switch ON.
5. Press the accelerator pedal (0.5/8 - 4/8 throttle) not to exceed the half, and hold it in the half or less open
position. (This will set the closed throttle position signal to OFF and the wide open throttle position signal
to OFF.)
6. Perform “ERASE”.
7. Wait 3 seconds and then release the accelerator pedal.
8. Turn ignition switch OFF.
METHOD FOR WRITING DATA FROM THE ROM ASSEMBLY IN THE TRANSAXLE
In the following procedure, the TCM reads data from the ROM assembly and writes it to the EEPROM in the
TCM.
1. Erase the EEPROM in the TCM.
2. Move selector lever to “P” position.
3. Turn ignition switch ON.
CHECK METHOD
 Standard: About 2 seconds after the ignition switch ON, the CVT indicator lamp lights up for 2 seconds.
 Non-standard: Even after the ignition switch ON, the CVT indicator lamp does not light up after 2 seconds or
illuminates immediately.
CAUTION:
Perform in the “P” or “N” position.
Action for Non-standard
 Replace the CVT assembly.
 Replace the TCM.
CVT assembly TCM Erasing EEPROM in TCM Remarks
Replaced Replaced Not requiredNot required because the EEPROM in the TCM is in
the default state. (CVT assembly must be replaced
first.)
Not replaced Replaced Not requiredNot required because the EEPROM in the TCM is in
the default state.
Replaced Not replaced RequiredRequired because data has been written in the EE-
PROM in the TCM and because the TCM cannot write
data from the ROM assembly in the transmission.

CVT SYSTEM
TM-13
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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FUNCTION DIAGNOSIS
CVT SYSTEM
System DiagramINFOID:0000000003848917
JPDIA0755GB

TM-14
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
CVT SYSTEM
Component Parts Location
INFOID:0000000003848918
*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. Center console B. Combination meter C. Engine room LH
D. CVT assembly E. Accelerator pedal, upper
JPDIA0747ZZ

CVT SYSTEM
TM-15
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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 CVT fluid temperature sensor
 Secondary pressure sensor
 ROM assembly

TM-16
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
MECHANICAL SYSTEM
MECHANICAL SYSTEM
Cross-Sectional ViewINFOID:0000000003848919
1. Converter housing 2. Oil pump 3. Forward clutch
4. Reverse brake 5. Planetary carrier 6. Primary pulley
7. Steel belt 8. Sun gear 9. Side cover
10. Internal gear 11. Secondary pulley 12. Final gear
13. Differential case 14. Idler gear 15. Reduction gear
16. Taper roller bearing 17. Output gear 18. Parking gear
19. Input shaft 20. Torque converter
SCIA7859E

MECHANICAL SYSTEM
TM-17
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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System DiagramINFOID:0000000003848920
System DescriptionINFOID:0000000003848921
Transmits the power from the engine to the drive wheel.
JPDIA0755GB

TM-18
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
MECHANICAL SYSTEM
Component Parts Location
INFOID:0000000003848922
*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

MECHANICAL SYSTEM
TM-19
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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 CVT fluid temperature sensor
 Secondary pressure sensor
 ROM assembly
Component DescriptionINFOID:0000000003848923
Item Function
Torque converterThe torque converter is the device that increases the engine torque as well as the con-
ventional AT and transmits it to the transaxle.
Oil pumpThe adoption of a trochoidal oil pump with a flow control valve actuated directly by the
engine enables the sufficient discharge from an oil pump in the low-rpm range and the
adequate discharge adjustments in the high-rpm range.
Planetary gear
Perform the transmission of drive power and the switching of forward/backward move-
ment. Forward clutch
Reverse brake
Primary pulley It is composed of a pair of pulleys (the groove width is changed freely in the axial direc-
tion) and the steel belt (the steel star wheels are placed continuously and the belt is guid-
ed with the multilayer steel rings on both sides). The groove width changes according to
wrapping radius of steel belt and pulley from low status to overdrive status continuously
with non-step. It is controlled with the oil pressures of primary pulley and secondary pul-
ley. Secondary pulley
Steel belt
Output gear
Reduction gear consists of primary deceleration (output gear and idler gear in pair) and
secondary deceleration (reduction gear and final gear in pair). Each of them uses a he-
lical gear. Idler gear
Reduction gear
Final gear
Differential
Manual shaft
The parking rod rotates the parking pole and the parking pole engages with the parking
gear when the manual shaft is in “P” position. As a result the parking gear and the output
axis are fixed. Parking rod
Parking pawl
Parking gear

TM-20
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
HYDRAULIC CONTROL SYSTEM
HYDRAULIC CONTROL SYSTEM
System DiagramINFOID:0000000003848924
System DescriptionINFOID:0000000003848925
The hydraulic control mechanism consists of the oil pump directly driven by the engine, the hydraulic control
valve that controls line pressure and transmission, and the input signal line.
LINE PRESSURE AND SECONDARY PRESSURE CONTROL
 When an input torque signal equivalent to the engine driving force is transmitted from the ECM to the TCM,
the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.
 Line pressure solenoid valve activates pressure regulator valve, and line pressure from oil pump is adjusted
for the optimum driving condition. Secondary pressure is controlled by lowering line pressure.
JPDIA0589GB
SCIA1846E

HYDRAULIC CONTROL SYSTEM
TM-21
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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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