Nissan Maxima Service and Repair Manual: System description

  • CVT system
  • System Diagram Component Parts Location  CVT shift selector assembly (Manual mode select switch and manual mode position select switch)  Secondary speed sensor  CVT unit harness connector  TCM  Accelerator pedal position (APP) sensor  Stop lamp switch  Shift positioner indicator Manual mode indicator DS mode indicator  Paddle shifters

  • Mechanical system
  • Cross-Sectional View  Converter housing  Oil pump  Forward clutch  Reverse brake  Planetary carrier  Primary pulley  Steel belt  Sun gear  Side cover  Internal gear  Secondary pulley  Final gear  Differential case  Idler gear  Reduction gear  Taper roller bearing  Output gear  Parking gear  Input shaft  Torque converter System Diagram System Description Transmits the power from the engine to the drive wheel.

  • 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 lin 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.

  • 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.

  • 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.

  • 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 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 highest.

  • Shift lock system
  • System Diagram System Description The selector lever cannot be shifted from "P" position to any other position unless the ignition switch is in the ON position and the brake pedal is depressed. Component Parts Location  BCM (view with combination meter removed)  Stop lamp switch  Shift lock release  CVT shift selector connector  Park position switch 6.

  • On board diagnostic (OBD) system
  • Diagnosis Description DESCRIPTION The CVT system has two self-diagnostic systems. The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination with the ECM. A malfunction is indicated by the MIL (Malfunction Indicator Lamp) and is stored as a DTC in the ECM memory and in the TCM memory. The second is the TCM original self-diagnosis performed by the TCM. A malfunction history is stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For details, refer to TM- 124, "DTC Index". OBD-II FUNCTION The ECM provides emission-related on board diagnostic (OBD-II) functions for the CVT system.

  • Diagnosis system (TCM)
  • CONSULT Function FUNCTION CONSULT can display each diagnostic item using the diagnostic test modes shown following. WORK SUPPORT MODE Display Item List Engine Brake Adjustment CAUTION: Mode of "+1""0""−1""−2""OFF" can be selected by touching "UP"or "DOWN" on CONSULT screen. However, do not select a mode other than "0" and "OFF". Selecting "+1" or "−1" or "-2" may cause irregular driveability. Check CVT Fluid Deterioration Date CAUTION: Touch "CLEAR" after changing CVT fluid, and then erase "CVTF DETERIORATION DATE". SELF DIAGNOSTIC RESULTS MODE Display Items List Refer to TM-124, "DTC Index".

Additional service when replacing transaxle assembly

CVT system