Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Automatic Transmission and Differential MSA5TCD00L18194

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MSA5TCD00L18194


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                              LEGACY (W2260BE_SGML Complete)



3-2     [M700]                              MECHANISM AND FUNCTION
7. Hydraulic Control Valve


7. Hydraulic Control Valve
The hydraulic control system consists of an oil pump, control valve bodies, clutches and connect-
ing passages and pipes. When it is activated manually, or automatically by the electronic control
system, it hydraulically controls the gearshifting mechanism.

A: CONSTRUCTION




                                                                                                                          B3H0903B

   (1)   High clutch accumulator piston B      (12)   Torque converter regulator valve   (23)   1st reducing valve
   (2)   2-4 brake accumulator piston B        (13)   Pressure modifier valve            (24)   Throttle accumulator piston A
   (3)   Pressure regulator sleeve             (14)   Accumulator control valve A        (25)   Lock-up control sleeve
   (4)   Pressure regulator plug               (15)   Low clutch timing valve A          (26)   Lock-up control plug
   (5)   Pressure regulator valve              (16)   Low clutch timing sleeve A         (27)   Lock-up control valve
   (6)   Reverse inhibit valve                 (17)   Low clutch timing plug A           (28)   Modifier accumulator piston
   (7)   Accumulator control valve B           (18)   Low clutch timing valve B          (29)   Pilot valve
   (8)   2-4 brake timing plug A               (19)   Shift valve B
   (9)   2-4 brake timing sleeve A             (20)   Shift valve A                       [1] Upper valve body
  (10)   2-4 brake timing valve A              (21)   Manual valve                        [2] Middle valve body
  (11)   2-4 brake timing valve B              (22)   Throttle accumulator piston B       [3] Lower valve body




                                                                 12
                LEGACY (W2260BE_SGML Complete)



                                       MECHANISM AND FUNCTION                                                  [M7B0]      3-2
                                                                                                     7. Hydraulic Control Valve


B: FUNCTION
                 Name                                                             Function
                                          Regulates the pressure of ATF delivered from the oil pump to an optimum level (line
Pressure regulator valve
                                          pressure) corresponding to vehicle running conditions.
                                          Adjusts the pressure modifier pressure depending on the driving condition to keep
Pressure modifier valve
                                          the line pressure at the optimum level.
                                          Smoothes the pressure regulated by the pressure modifier valve to prevent pulsation
Pressure modifier accumulator piston
                                          in line pressure.
Line pressure relief valve                Prevents excessive rise of the line pressure.
                                          Delivers line pressure to each circuit corresponding to the selected position.




Manual valve



                                                                                                                           B3H0504
                                          When the valve is set in the "line pressure no delivery" position, the pressure is re-
                                          lieved.
                                          Generates by reducing the line pressure a constant pressure (pilot pressure) use for
Pilot valve                               controlling the line pressure, lock-up pressure, clutch/brake pressure during shifting
                                          and the transfer.
Torque converter clutch regulator valve   Prevents excessive rise of torque converter clutch pressure.
                                          Engages or disengages the lock-up clutch.
Lock-up control valve
                                          Also regulates the lock-up clutch engaging pressure to prevent lock-up shocks.
                                          Simultaneously changes three different ATF passages using shift solenoid 1 output
                                          pressure corresponding to such operating conditions as vehicle speed and throttle
Shift valve A
                                          position. Combined with shift valve B, this valve permits automatic shifting of 1st 2nd
                                          3rd 4th speeds.
                                          Simultaneously changes three different ATF passages using shift solenoid 2 output
                                          pressure corresponding to such operating conditions as vehicle speed and throttle
Shift valve B
                                          position. Combined with shift valve A, this valve permits automatic shifting of 1st 2nd
                                          3rd 4th speeds.
                                          Switches the ATF passages when the 2-4 brake pressure rises to a certain level dur-
                                          ing upshifting from 3rd to 4th speed, in order to drain the low clutch accumulator
Low clutch timing valve A
                                          back-pressure and to release the low clutch. This operation ensures smoother shift-
                                          ing.
                                          Returns the low clutch timing valve A to the original position after 3rd to 4th speed
Low clutch timing valve B
                                          upshifting.
                                          Switches the ATF passages when the high clutch pressure rises to a certain level
                                          during upshifting from 2nd to 3rd speed, in order to drain the 2-4 brake accumulator
2-4 brake timing valve A
                                          A back-pressure and to release the 2-4 brake. This operation ensures smoother
                                          shiftings.
                                          Returns the 2-4 brake timing valve A to the original position after 2nd to 3rd speed
2-4 brake timing valve B
                                          upshifting.
                                          Allows ATF in the low & reverse brake circuit to drain during forward driving at a
Reverse inhibit valve                     speed higher than the predetermined value, preventing shifting into reverse even if
                                          "R" range is selected.
                                          Reduces the low-reverse brake operating pressure so as to relieve engine braking
"1st" Reducing valve
                                          shock when changing from 2 range 2nd speed to 1st speed.




                                                               13
                            LEGACY (W2260BE_SGML Complete)



3-2     [M7B0]                      MECHANISM AND FUNCTION
7. Hydraulic Control Valve


                Name                                                         Function
                                       Regulates the accumulator control A pressure (low clutch accumulator A back-pres-
Accumulator control valve A            sure, high clutch accumulator A back-pressure, 2-4 brake timing control signal pres-
                                       sure) depending upon driving conditions.
                                       Regulates the accumulator control B pressure (2-4 brake accumulator A back-pres-
Accumulator control valve B
                                       sure, low clutch timing control signal pressure) depending upon driving conditions.
                                       Modulates the low clutch pressure gradually to damper the shifting shocks when the
Low clutch accumulator
                                       low clutch is engaged and disengaged.
                                       Modulates the 2-4 brake clutch pressure gradually to damper the shifting shocks
2-4 brake accumulator A
                                       when the 2-4 brake clutch is engaged and disengaged.
                                       Slows down the 2-4 brake clutch pressure increase speed during 3rd to 4th speed
2-4 brake accumulator B                upshifting to prevent the timing variations which may occur when the low clutch tim-
                                       ing valve A is switched (to damper shifting shocks).
                                       Modulates the high clutch pressure gradually to damper the shifting shocks when the
High clutch accumulator A
                                       high clutch is engaged and disengaged.
                                       Slows down the high clutch pressure increase speed during 2nd to 3rd speed up-
High clutch accumulator B              shifting to prevent the timing variations which may occur when the 2-4 brake clutch
                                       timing valve A is switched (to damper shifting shocks).
                                       Smoothes the output pressure of the line pressure duty solenoid valve to prevent the
Throttle accumulator A
                                       pulsation.
                                       Smoothes the output pressure of the 2-4 brake duty solenoid valve to prevent the
Throttle accumulator B
                                       pulsation.




                                                           14



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