AUTOMATIC TRANSMISSION SYSTEM


  1. CONSTRUCTION


    1. The ATF warmer has a transmission oil thermostat that changes the route through which the ATF flows.

    2. The ATF warmer uses engine coolant that has been warmed by the engine to warm up the ATF quickly. Consequently, the friction losses of the automatic transmission are quickly reduced, thus improving fuel economy.

      A019QJTC01
      *1 ATF Warmer *2 Transmission Oil Thermostat
      *a To Transmission *b From Transmission
      *c To ATF Cooler *d From ATF Cooler
      *e To Engine *f From Heater Core
      *g ATF Flow *h Engine Coolant Flow

    3. Models without air-cooled type ATF cooler: when the ATF temperature is low, it is heated by the ATF warmer using the engine coolant, and when the ATF temperature is high, it is cooled down by the ATF warmer and radiator (water-cooled type ATF cooler).

      Figure 1. Models without Air-cooled Type ATF Cooler

      A019R2HC01
      *1 Transmission *2 ATF Warmer
      *3 Transmission Oil Thermostat *4 Radiator (Water-cooled Type ATF Cooler)
      *a ATF Temperature is Low *b ATF Temperature is High

    4. Models with air-cooled type ATF cooler: when the ATF temperature is low, it is heated by the ATF warmer using the engine coolant, and when the ATF temperature is high, it is cooled down by the ATF warmer, radiator (water-cooled type ATF cooler) and air-cooled type ATF cooler.

      Figure 2. Models with Air-cooled Type ATF Cooler

      A019QJ4C01
      *1 Transmission *2 ATF Warmer
      *3 Transmission Oil Thermostat *4 Radiator (Water-cooled Type ATF Cooler)
      *5 Air-cooled Type ATF Cooler - -
      *a ATF Temperature is Low *b ATF Temperature is High

    5. The transmission oil thermostat consists of a poppet valve, a bypass valve and an element case (contains wax). When the ATF temperature changes from low to high, the wax will expand to start to open the poppet valve and close the bypass valve, thus switching the ATF passages.

      A019QOVC01
      *1 Transmission Oil Thermostat *2 Element Case (Contains Wax)
      *3 ATF Warmer - -
      *a ATF Temperature is Low *b ATF Temperature is High
      *c Poppet Valve: Closed *d Poppet Valve: Open
      *e Bypass Valve: Open *f Bypass Valve: Closed
      *g From Transmission *h To Transmission
      *i To ATF Cooler *j From ATF Cooler
      *k ATF Flow - -