CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM SYSTEM DESCRIPTION


  1. SYSTEM DESCRIPTION


    1. The Continuously Variable Transaxle (CVT) is an automatic transmission that electronically controls shift timing using the Transmission 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 primary pulley according to vehicle speed and accelerator pedal position.
    Shift solenoid valve DS2 Controls the oil flow from primary pulley according to 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 SLU 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 turbine revolution speed.
    CVT fluid temperature sensor Detects the CVT fluid temperature.
    Oil pressure sensor Detects the oil pressure for belt clamping force.
    Engine coolant temperature sensor Detects the engine coolant temperature.
    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 signal 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 diagnosis tool to read diagnostic trouble code and ECM data.