K312 CVT SYSTEM


  1. OUTLINE


    1. A K312 Continuously Variable Transaxle (CVT) is used for the 1NZ-FE engine models.

    2. The K312 CVT, which includes a pair of the pulleys and the steel belt in the shift mechanism, is a transaxle which steplessly shifts from start-up to the maximum speed, offering a smooth shift feeling and excellent fuel economy.

    3. A special CVT fluid filling procedure is used in order to improve the accuracy of the CVT fluid level when the transaxle is being repaired or replaced.

    4. A coaxial 2-port type oil pump system is used.

    5. A gate type shift lever is used.

    6. A 7-speed sport sequential shiftmatic system is used.

    7. A pattern select switch is used.

      A005G9A

  2. PRECAUTION


    1. Ignition Switch Expressions


      1. The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section.

        Expression

        Ignition Switch

        (Position)

        Engine Switch

        (Condition)
        Ignition Switch off LOCK Off (Lock)
        Ignition Switch ACC ACC On (ACC)
        Ignition Switch ON ON On (IG)
        Engine Start START On (Start)

  3. SPECIFICATION


    1. CVT Assembly

      Shift Mechanism Pulley and Steel Belt
      Forward/Reverse Switching Mechanism Double Pinion Type Planetary Gear
      Pulley Ratio Forward 2.480 to 0.396
      Reverse 2.604 to 1.680
      Differential Gear Ratio*1 5.356
      Fluid Capacity Liters (US qts, Imp. qts) 7.47 (7.89, 6.57)
      Fluid Type Toyota Genuine CVT Fluid FE
      Weight (Reference)*2 kg (lb) 73.8 (162.7)

      Tech Tips

      *1: Reduction gear ratio included.

      *2: Weight shown includes CVT fluid filled to the specified level.

    2. Friction Disc and Gears

      Planetary Gear No. of Sun Gear Teeth 40
      No. of No. 1 Pinion Gear Teeth 18
      No. of No. 2 Pinion Gear Teeth 17
      No. of Ring Gear Teeth 82
      Forward Clutch No. of Discs 3
      Reverse Brake No. of Discs 3
      Reduction Gear Drive Gear 25
      Driven Gear 37
      Differential Gear Drive Gear 21
      Driven Gear 76

    3. Torque Converter Assembly

      Torque Converter Type 3-element, 1-step, 2-phase
      Stall Torque Ratio 1.75

  4. MAIN FEATURES


    1. The K312 CVT has achieved the following performance features through the use of these items:

      Item Fuel Economy Power Efficiency Driveability Quietness Compact and Lightweight
      2-port Type Oil Pump ○ ○ ○ - ○
      CVT Fluid Low Viscosity CVT Fluid ○ - - - -
      Forward/Reverse Switching Unit - ○ ○ - ○
      Transmission Valve Body Assembly ○ ○ ○ - -
      Electric Control Line Pressure Independent Control ○ - ○ - -
      Engine-CVT Integrated Control ○ ○ ○ - -
      Pulley Ratio Control Automatic Shift Control ○ ○ ○ - -
      Acceleration Improvement Control - - ○ - -
      7-speed Sport Sequential Shiftmatic* - - ○ - -
      Neutral Control ○ - - - -
      Shift Control in Uphill/Down hill Travelling - - ○ - -
      Lock-up Control ○ - ○ - -
      Flex Lock-up Control ○ - ○ - -
      CVT Sport Mode - - ○ - -

      • *: The High grade is provided with shift paddle switch (transmission shift switch assembly).

      Tech Tips

      ○: Applicable

      -: Not applicable