Nissan Altima 2007-2012 Service Manual: 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.

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.

*: Without manual mode.

INPUT/OUTPUT SIGNAL OF TCM

*1: Input by CAN communications.

*2: If these input and output signals are different, the TCM triggers the fail-safe function.

Component Parts Location - Coupe

1. Control device assembly

2. Accelerator pedal position sensor

3. CVT unit harness connector

4. Primary speed sensor

5. Secondary speed sensor

6. PNP switch

7. TCM

8. Battery

9. Shift position indicator Manual mode indicator

Component Parts Location - Sedan

1. Control device assembly

2. Accelerator pedal position sensor

3. CVT unit harness connector

4. Primary speed sensor

5. Secondary speed sensor

6. PNP switch

7. TCM

8. Battery

9. Shift position indicator Manual mode indicator

Component Description

TRANSAXLE ASSEMBLY

EXCEPT TRANSAXLE ASSEMBLY

    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 transmiss ...

    Lock-up and select control system
    System Diagram System Description • The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to increase power transmission efficiency. • ...

    Other materials:

    Camera on signal circuit (sedan)
    Description When the selector lever is placed in the R position, the rear view camera control unit sends a camera ON signal to the rear view camera. Diagnosis Procedure 1.CHECK CAMERA ON SIGNAL CIRCUIT CONTINUITY 1. Turn ignition switch OFF. 2. Disconnect rear view camera control unit con ...

    Timing chain
    Removal and Installation 1. O-rings 2. Camshaft sprocket (INT) 3. Camshaft sprocket (EXH) 4. Chain tensioner 5. Spring 6. Chain tensioner plunger 7. Timing chain slack guide 8. Timing chain 9. Front cover 10. Chain guide 11. IVT solenoid valve 12. IVT cover 13. Crankshaft pulley bolt ...

    Tweeter (sedan)
    Description The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the tweeters using the audio signal circuits. Diagnosis Procedure 1.HARNESS CHECK 1. Disconnect BOSE speaker amp. connector B122 and suspect tweet ...