AB60F AUTOMATIC TRANSMISSION


  1. GENERAL


    1. In addition to the water-cooled type ATF cooler, either of an air-cooled type ATF cooler or an ATF warmer is provided to this automatic transmission. The ATF warmer is used to warm up ATF quickly and to set an ATF temperature higher.

      Figure 1. Cooling Circuits (ATF Warmer and Water-cooled Type ATF Cooler)

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      Figure 2. Cooling Circuits (Water-cooled Type ATF Cooler and Air-cooled Type ATF Cooler)

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      *1 Transmission
      *2 Water-cooled ATF Cooler
      *3 Air-cooled ATF Cooler

  2. ATF WARMER


    1. General


      1. The ATF warmer uses engine coolant to warm up the ATF quickly and keep the ATF temperature higher (within limits). Consequently, the friction losses of the automatic transmission are quickly reduced, thus improving fuel economy.

      2. The ATF warmer has a transmission oil thermostat that changes the route through which the ATF flows. When the ATF temperature is low, it is heated by the ATF warmer using the engine coolant, and when the temperature is high, it is cooled down by the ATF warmer and ATF cooler.

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

    2. Transmission Oil Thermostat


      1. The transmission oil thermostat consists of the poppet valve, bypass valve and 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.

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        *1 Element Case (Contains Wax) *2 Poppet Valve
        *3 Bypass Valve *4 ATF Warmer
        *a ATF Flow *b To ATF Cooler
        *c From ATF Cooler *d Cross-section View of Fluid Switching Passages
        *e Transmission Oil Thermostat - -

        Figure 3. Operation of Transmission Oil Thermostat

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        *1 Poppet Valve: Closed *2 Element Case (Contains Wax)
        *3 ATF Warmer *4 Bypass Valve: Open
        *5 Poppet Valve: Open *6 Bypass Valve: Closed
        *a From Transmission *b To Transmission
        *c To ATF Cooler *d From ATF Cooler
        *e ATF Temperature: Low *f ATF Temperature: High

  3. ATF COOLER


    1. The water-cooled type ATF cooler cools down the ATF using the engine coolant, and is fitted on the lower of the radiator.

    2. The air-cooled type ATF cooler cools down the ATF using the cooling fins which are provided on the cooler itself, and is fitted inside the radiator grille so that it can be exposed to the air directly while the vehicle is running.

      Figure 4. Models with ATF Warmer and Water-cooled Type ATF Cooler

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      *1 ATF Warmer *2 Water-cooled Type ATF Cooler

      Figure 5. Models with Water-cooled Type and Air-cooled Type ATF Coolers

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      *1 Water-cooled Type ATF Cooler *2 Air-cooled Type ATF Cooler