Nissan Altima 2007-2012 Service Manual: Hydraulic control system

System Diagram

System Description

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 drive force is sent from the ECM to the TCM, the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.

• This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving state. Secondary pressure is controlled by decreasing line pressure.

Nomal Control

Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throttle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revolution 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

When controlling the normal fluid pressure or the selected fluid pressure, the secondary pressure can be set more accurately by using the fluid pressure sensor to detect the secondary pressure and controlling the feedback.

Component Parts Location - Coupe

1. Control device assembly (Manual mode select switch and manual mode position select switch)

2. Accelerator pedal position (APP) sensor

3. Secondary speed sensor

4. CVT unit harness connector

5. TCM

6. Battery

7. Shift position indicator Manual mode indicator

Component Parts Location - Sedan

1. Control device assembly (Manual mode select switch and manual mode position select switch)

2. Accelerator pedal position (APP) sensor

3. Secondary speed sensor

4. CVT unit harness connector

5. TCM

6. Battery

7. Shift position indicator Manual mode indicator

Component Description

TRANSAXLE ASSEMBLY

EXCEPT TRANSAXLE ASSEMBLY

    Mechanical system
    Cross-Sectional View 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 1 ...

    Control system
    System Diagram System Description The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift position and reduces shifting and lock-up shocks. C ...

    Other materials:

    P0116 ect sensor
    Description The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change i ...

    Remote Engine Start (if so equipped)
    The button will be on the NISSAN Intelligent Key® if the vehicle has remote engine start. This feature allows the engine to start from outside the vehicle. The following features may be affected when the remote start feature is used: ● Vehicles with a manual climate control sys ...

    P0145 HO2S3
    Description The heated oxygen sensor 3, after HC adsorption catalyst (Under floor), monitors the oxygen level in the exhaust gas on each bank. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Unde ...