Nissan Maxima Service and Repair Manual: 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.
  •  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 position, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.

Component Parts Location

  1.  CVT shift selector assembly (Manual mode select switch and manual mode position select switch)
  2.  Secondary speed sensor
  3.  CVT unit harness connector
  4.  TCM
  5.  Accelerator pedal position (APP) sensor
  6.  Shift positioner indicator Manual mode indicator DS mode indicator
  7.  Paddle shifters

Component Description

TRANSAXLE ASSEMBLY

EXCEPT TRANSAXLE ASSEMBLY

    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. T ...

    Shift control system
    System Diagram NOTE: The gear ratio is set for each position separately. System Description In order to select the gear ratio that can obtain the driving force in accordance with driver's inten ...

    Other materials:

    Power supply and ground circuit
    Description EPS system functions by ignition power supply. Diagnosis Procedure 1.CHECK POWER SUPPLY Turn the ignition switch OFF. Disconnect power steering control unit connector. Turn the ignition switch ON. Check voltage between power steering control unit connectorM59 terminal 3 ...

    Fuel injector
    Description The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil pulls the ball valve back and allows fuel to flow via the fuel injector into the intake manifold. T ...

    P0500 VSS
    Description ECM receives vehicle speed signals from two different paths via CAN communication line: One is from the ABS actuator and electric unit (control unit) via the combination unit and the other is from TCM. DTC Logic DTC DETECTION LOGIC NOTE:  If DTC P0500 is displayed with ...

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    Nissan Maxima Service and Repair Manual

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