A750F AUTOMATIC TRANSMISSION


  1. GENERAL


    1. The valve body unit consists of the (No. 1 and No. 2) upper and lower valve bodies and 7 solenoid valves.

      A01W60JC01
      *1 No. 2 Upper Valve Body *2 No. 1 Upper Valve Body
      *3 Shift Solenoid Valve SLT *4 Shift Solenoid Valve SL1
      *5 Lower Valve Body *6 Shift Solenoid Valve S1
      *7 Shift Solenoid Valve S2 *8 Shift Solenoid Valve SR
      *9 Shift Solenoid Valve SLU *10 Shift Solenoid Valve SL2

      Figure 1. No. 1 Upper Valve Body

      A01W6SMC01
      *1 Solenoid Modulator Valve *2 Clutch Lock Valve
      *3 B1 Accumulator *4 Secondary Regulator Valve
      *5 Lock-up Relay Valve *6 Lock-up Control Valve
      *7 C3 Check Valve *8 3 - 4 Shift Valve
      *9 Brake Control Valve *10 B1 Apply Control Valve
      *11 1 - 2 Shift Valve *12 2 - 3 Shift Valve

      Figure 2. No. 2 Upper Valve Body

      A01W6EFC01
      *1 Coast Brake Relay Valve - -

      Figure 3. Lower Valve Body

      A01W66GC01
      *1 SLT Damper *2 Primary Regulator Valve
      *3 Clutch Control Valve *4 Accumulator Control Valve
      *5 Sequence Valve *6 Clutch Apply Control Valve

  2. SHIFT SOLENOID VALVE


    1. Shift Solenoid Valve S1, S2 and SR


      1. Solenoid valves S1 and SR use a 3-way solenoid valve.

      2. Solenoid valve S2 uses a 2-way solenoid valve.

      3. A filter is provided at the tip of each solenoid valve to further improve operational reliability.

        A01W5SKE01
        A01W63NE01
        Function of Shift Solenoid Valve S1, S2 and SR
        Shift Solenoid Valve Type Function
        S1 3-way Switches the 2 - 3 shift valve
        S2 2-way

        • Switches the 1 - 2 shift valve

        • Switches the 3 - 4 shift valve
        SR 3-way Switches the clutch apply control valve

    2. Shift Solenoid Valve SL1, SL2, SLT and SLU


      1. SL1, SL2, SLT, and SLU are used by the ECM to control hydraulic pressures in a linear fashion based on the current that the ECM causes to flow through their solenoid coils. They control line, clutch, and brake engagement pressure based on the signals received from the ECM.

      2. The shift solenoid valves SL1, SL2, SLT, and SLU have the same basic structure.

        A01W68BE01
        Function of Shift Solenoid Valve SL1, SL2, SLT and SLU
        Solenoid Valve Function
        SL1

        • Clutch pressure control

        • Accumulator back pressure control
        SL2 Brake pressure control
        SLT

        • Line pressure control

        • Accumulator back pressure control
        SLU Lock-up clutch pressure control