AUTOMATIC TRANSMISSION SYSTEM


  1. CONSTRUCTION


    1. The shift solenoid valves S1, S2, S3, S4 and SR are 3-way solenoid valves.

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

      Figure 1. Shift Solenoid Valves S1, S2, S3 and SR

      A019QMVC01
      *1 Filter - -
      *a Off Condition *b On Condition
      *c Line Pressure *d Control Pressure
      *e Drain - -

      Figure 2. Shift Solenoid Valve S4

      A019QW5C01
      *1 Filter - -
      *a Off Condition *b On Condition
      *c Line Pressure *d Control Pressure
      *e Drain - -
      Function of Shift Solenoid Valves S1, S2, S3, S4 and SR
      Shift Solenoid Valve Function
      S1 Switches the 1-2 shift valve and the SL1 relay valve.
      S2 Switches the 2-3 shift valve and the 5-6 shift valve.
      S3 Switches the 3-4 shift valve.
      S4 Switches the 4-5 shift valve, SL1 relay valve and reverse sequence valve.
      SR

      Switches the clutch apply relay valve and B1relay valve.

    3. In order to provide a hydraulic pressure that is proportional to the current that flows to the solenoid coil, the shift solenoid valves SL1 and SL2 linearly control the clutch pressure based on the signals they receive from the ECM.

      Figure 3. Shift Solenoid Valve S1 and S2

      A019R3LE03

    4. In order to provide a hydraulic pressure that is proportional to the current that flows to the solenoid coil, the line pressure control solenoid assembly (SLT) linearly controls the line pressure based on the signals it receives from the ECM.

      Figure 4. Shift Solenoid Valve SLT

      A019QM2E03

    5. In order to provide a hydraulic pressure that is proportional to the current that flows to the solenoid coil, the lock-up control solenoid assembly (SLU) linearly controls the lock-up clutch engagement pressure based on the signals it receives from the ECM.

      Figure 5. Shift Solenoid Valve SLU

      A019R46E03
      Function of Shift Solenoid Valves SL1, SL2, SLT and SLU
      Shift Solenoid Valve Function
      SL1

      • C1clutch pressure control

      • Accumulator back pressure control
      SL2

      B1, B2and B4brake pressure control
      SLT

      • Line pressure control

      • Accumulator back pressure control
      SLU

      • Lock-up clutch pressure control

      • Accumulator back pressure control