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 SL

    Switches the usage of shift solenoid valve SLS.

    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 speed.

    Transmission revolution sensor (NOUT)

    Detects the secondary pulley speed.

    Transmission revolution sensor (NT)

    Detects the input turbine speed.

    CVT oil temperature sensor

    Detects the CVT fluid temperature.

    CVT oil pressure sensor

    Detects the CVT 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 transaxle based on the signal from each sensor. It has a diagnosis mode and fail-safe functions for use when the system has malfunctioned.

    DLC3

    Used for connecting the diagnosis tool to read diagnostic trouble code and ECM data.