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Home >> Toyota >> 2018 >> Corolla XLE >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Continuously Variable Transaxle - Diagnostics - Introduction (Model Code: ZRE172) >> Continuously Variable Transaxle System >> System Description [08/2013 - ] >> System Description [08/2013 - ]
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System Description [08/2013 - ]

  1. SYSTEM DESCRIPTION 
    1. The K313 (CVT) is a fully electrohydraulically controlled steel belt type continuously variable transaxle. This is a highly efficient transaxle that is controlled in conjunction with the engine, contributing to enhanced fuel efficiency and quietness without shift shock. In addition, the continuously variable transaxle has the following features:
      • Diagnostic function
      • Fail-safe function when a malfunction occurs
  2. FUNCTION OF MAIN COMPONENTS 
    1. The main components of the K313 CVT system are as follows:
      Component Outline
      Continuously Variable Transaxle Assembly Shift Solenoid Valve SC Used to switch control of the shift solenoid valve SLU between forward and reverse clutch control and lock-up clutch control.
      Shift Solenoid Valve SL
      Shift Solenoid Valve SLU Performs forward and reverse clutch control or lock-up clutch control depending on the state of the shift solenoid valves SC and SL.
      Shift Solenoid Valve SLP Controls the oil pressure of the primary pulley.
      Shift Solenoid Valve SLS Controls the oil pressure of the secondary pulley.
      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 Fluid Temperature Sensor Detects the CVT fluid temperature.
      CVT Oil Pressure Sensor Detects the CVT oil pressure for belt clamping force.
      Stop Light Switch Assembly Detects the state of the brake pedal.
      Park/Neutral Position Switch Assembly Detects the position of the shift lever.
      Shift Paddle Switch (Transmission Shift Switch Assembly)
      • Detects the driver's shift-up and shift-down operations in 7-speed sport sequential shiftmatic mode.
      • Operating this switch when the shift lever is in D changes the mode temporarily to 7-speed sport sequential shiftmatic mode.
      Transmission Floor Shift Assembly Transmission Control Switch
      • Detects that the shift lever is in S or M.
      • Detects the driver's shift-up and shift-down operations when the shift lever is in M.
      Combination Meter Assembly Shift Position Indicator Indicates the shift lever position.
      Malfunction Indicator Lamp (MIL) Illuminates or blinks to alert the driver that the ECM has detected a malfunction.
      SPORT Mode Indicator Light Illuminates when SPORT mode is on.
      ECM
      • Performs electronic control of the CVT system.
      • When the ECM detects a malfunction, the ECM performs diagnosis and memorizes the malfunctioning area.
      SPORT Mode Switch (Pattern Select Switch Assembly) Operating this switch turns SPORT mode on or off.
      Airbag Sensor Assembly* Yaw Rate Sensor Detects the vehicle's yaw rate.
      Acceleration Sensor Detects the vehicle's longitudinal and lateral acceleration and deceleration.
      Brake Actuator Assembly Skid Control ECU
      • Transmits the vehicle speed and the longitudinal acceleration signal to the ECM.
      • Transmits the operating states of the ABS and VSC to the ECM.
      DLC3 Used for connecting the diagnosis tool to read diagnostic trouble codes and ECM data.

      HINT: 

      *: The airbag sensor assembly incorporates the yaw rate sensor and acceleration sensor.

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