CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM SYSTEM DESCRIPTION


  1. SYSTEM DESCRIPTION


    1. The Continuously Variable Transaxle (CVT) is an automatic transaxle that electronically controls shift timing using the Engine Control Module (ECM). The ECM detects electrical signals that indicate engine and driving conditions, and controls shift points based on driver habits and road conditions.

      In addition, the CVT has the following features:


      • Diagnostic function

      • Fail-safe function when a malfunction occurs

  2. FUNCTION OF MAIN COMPONENTS

    Component Outline
    Shift solenoid valve DS1 Controls the oil flow to the primary pulley according to the vehicle speed and accelerator pedal position.
    Shift solenoid valve DS2 Controls the oil flow from the primary pulley according to the vehicle speed and accelerator pedal position.
    Shift solenoid valve SLT

    Controls the line pressure.

    Controls the engagement oil pressure of the forward clutch and reverse brake.
    Shift solenoid valve DSU Controls the oil pressure for lock-up clutch engagement.
    Shift solenoid valve SLS Controls belt clamping pressure according to the input torque. Moreover, while the forward and reverse clutch is engaged, it controls the forward and reverse clutch oil pressure.
    Transmission revolution sensor (NIN) Detects the primary pulley revolution speed.
    Transmission revolution sensor (NOUT) Detects the secondary pulley revolution speed.
    Transmission revolution sensor (NT) Detects the input turbine revolution speed.
    CVT fluid temperature sensor Detects the CVT fluid temperature.
    Engine coolant temperature sensor Detects the engine coolant temperature.
    Oil pressure sensor Detects the Oil pressure for belt clamping force.
    Throttle position sensor Detects the opening of the throttle valve.
    Stop light switch Detects the state of the brake pedal.
    Park/neutral position switch Detects the position of the shift lever.
    ECM Controls the transmission based on the signals from each sensor. It has a diagnosis mode and fail-safe functions as a service when the system has malfunctioned.
    DLC3 Used for connecting the intelligent tester to read diagnostic trouble codes and ECM data.