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 MSA5TCD00L18198

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MSA5TCD00L18198


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                      LEGACY (W2260BE_SGML Complete)



3-2      [M11A0]                   MECHANISM      AND FUNCTION
11. Electronic-Hydraulic Control System


11. Electronic-Hydraulic Control System
A: GENERAL
The electronic-hydraulic control system consists of various sensors and switches, a transmission
control module (TCM) and the hydraulic controller including solenoid valves. The system controls
the transmission proper including shift control, lock-up control, timing control, reverse inhibit con-
trol, engine control, line pressure control, auto pattern select control and shift timing control. It also
controls the AWD transfer clutch. In other words, the system detects various operating conditions
from various input signals and sends output signals to shift solenoids 1 and 2, low clutch timing
solenoid, 2-4 brake timing solenoid, line pressure, lock-up, transfer and 2-4 brake duty solenoids
(a total of eight solenoids).




                                                                                                S3H0185B




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                                   MECHANISM AND FUNCTION                                                [M11B0]      3-2
                                                                                  11. Electronic-Hydraulic Control System


B: INPUT SIGNAL
              Signal name                                                  Major function
                                     Detects throttle position and determines shift point, line pressure and lock-up vehicle
Throttle position sensor
                                     speed according to engine load.
Vehicle speed sensor 2 (front)       Detects vehicle speed. This signal is used to control shifting, lock-up, line pressure,
(mounted to transmission)            and transfer clutch.
Vehicle speed sensor 1 (rear)        Used to control transfer clutch and as backup in case of failure of vehicle speed sen-
(mounted to extension case)          sor 2.
                                     Detects engine speed. This signal is used for lock-up clutch smooth, control at lock-
Engine speed signal
                                     up.
                                     Used to determine shifting and line pressure for respective ranges "P", "R", "N", "D",
Inhibitor switch
                                     "3", "2" and "1".
                                     Detects ATF temperature. This signal is used for inhibition of lock-up, release of OD
ATF temperature sensor
                                     and detection of ATF temperature.
                                     Used to change the mode from AWD to FWD. Also used to adapt the vehicle to FWD
FWD switch                           tester roller. Changeover from AWD to FWD can be accomplished by inserting a fuse
                                     into the fuse holder.
                                     When ABS is operating, to optimize ABS control, transfer clutch torque is controlled to
ABS signal                           eliminate the influence of engine braking and reduce the degree of coupling between
                                     front and rear wheels.
Cruise control signal                Detects operation of cruise control, and expands "4th" operating range.
Intake manifold pressure signal      Used to determine line pressure of shift change.
Torque converter turbine speed       Tells the rotation speed of the input shaft. The proportion of this speed to the vehicle
sensor                               speed determines whether shifting should be made or not.
Torque control cut signal            Sent from ECM to TCM to inhibit the torque control.




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3-2      [M11C0]                   MECHANISM                AND FUNCTION
11. Electronic-Hydraulic Control System


C: OUTPUT SIGNAL
             Signal name                                                       Function
                                       Controls shift stage by turning solenoid ON/OFF. Relationship between solenoid op-
Shift solenoids 1, 2                   eration and shifting stage is shown in Table below. When shifting, timing is controlled
                                       for each solenoid to reduce shock.
Line pressure duty solenoid            Regulates the line pressure according to driving conditions.
                                       Regulates the hydraulic pressure of the lock-up clutch and operates in three modes
Lock-up duty solenoid
                                       (open, smooth and lock-up).
                                       Regulates the hydraulic pressure of the transfer clutch and controls the driving force to
Transfer duty solenoid
                                       the rear drive shaft.
                                       Lights when ATF becomes hot (exceeds a set temperature level). This light is also
AT OIL TEMP light
                                       used for "on-board diagnostics".
                                       Regulates 2-4 brake duty pressure when 2-4 brake is operated to reduce shifting
2-4 brake duty solenoid
                                       shocks.
                                       Switches on or off the pressure acting on 2-4 brake timing valve B to control the re-
2-4 brake timing solenoid
                                       lease timing of the 2-4 brake
                                       Switches on or off the pressure acting on the low clutch timing valve B to control the
                                       release timing of the low clutch.
Low clutch timing solenoid
                                       Also switches on or off the pressure acting on the reverse inhibit valve to control the
                                       reverse inhibit function.
Torque control signal 1                Reduces engine torque at racing select and gear change.
Torque control signal 2                Reduces engine torque at racing select and gear change.




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                                         MECHANISM AND FUNCTION                                               [M11D0]      3-2
                                                                                       11. Electronic-Hydraulic Control System


D: CONTROL ITEM
Control item                                                          Description of control
                                        Normal shift control          Upshifting and downshifting are set for each range, gear
                                        D Normal pattern              position and pattern according to throttle position and ve-
                                        D Power pattern               hicle speed.
                 Gear shift control
                                        Control with ABS              Gear is locked in 3rd position when ABS signal enters.
                                        ATF low temperature           Shifting into 4th gear is prevented when ATF temperature is
                                        control                       below the preset value.
                                                                      Power pattern is selected when throttle opening change
                                        Power pattern control
                 Automatic pattern
                             attern                                   speed exceeds the preset value.
                 select control                                       When throttle opening is less than the preset value normal
                                        Normal pattern control
                                                                      pattern is resumed.
                                                                      Lock-up ON/OFF is set for 4th gear, gear position, and pat-
                                        Normal lock-up control        tern according to throttle position and vehicle speed. (Basi-
Transmission     Lock-up control                                      cally lock-up is OFF during gear shifting.)
control
                                        Smooth control                Smooth lock-up is performed when lock-up is switched on.
                                                                      Line pressure is regulated according to throttle position,
                                        Ordinary control
                                                                      vehicle speed and range signals.
                 Line pressure                                        Line pressure is regulated when shifting to lessen shifting
                                        Shifting control
                 control                                              shock.
                                                                      Line pressure is at a minimum so as to reduce engine
                                        Starting control
                                                                      cranking load.
                                        Shift step control            ON/OFF timing for shift solenoid is controlled.
                                        Lock-up control               When shifting, the lock-up clutch is temporarily released.
                 Shift timing control
                                                                      When shifting, line pressure is controlled to the optimum
                                        Line pressure control
                                                                      level so as to reduce shifting shock.
                                                                      Transfer oil pressure is regulated according to the throttle
                 Ordinary transfer control
                                                                      position angle and vehicle speed.
                 1st range control                                    Transfer oil pressure is increased.
                                                                      Immediately after detecting a slip, transfer oil pressure is
AWD transfer                                                          controlled to the same pressure as 1st range. (This control
                 Slip control
clutch control                                                        is canceled if V w 60 km/h (37 MPH), or when throttle is
                                                                      closed fully.)
                 Control it turns                                     Transfer oil pressure is reduced after detecting the turn.
                                                                      Transfer oil pressure is adjusted to set level immediately
                 ABS control
                                                                      after reception of ABS signal.




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                     LEGACY (W2260BE_SGML Complete)



3-2      [M11E0]                   MECHANISM   AND FUNCTION
11. Electronic-Hydraulic Control System


E: THROTTLE POSITION SENSOR
The throttle position sensor provides electrical signals corresponding to the throttle position. The
throttle position and accelerator depression speed are detected by this throttle position sensor
output.

F: VEHICLE SPEED SENSOR 1 (REAR)
The vehicle speed sensor (output shaft rotation sensor) is mounted to the extension case (from
the outside of the case). It detects the rear wheel speed based on the peripheral speed of the
transfer clutch drum and sends sine wave signals (30 pulses per rotation) to TCM.




                                                                                           B3H0915A




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                             MECHANISM AND FUNCTION                                   [M11H0]      3-2
                                                               11. Electronic-Hydraulic Control System


G: VEHICLE SPEED SENSOR 2 (FRONT)
The vehicle speed sensor (output shaft rotation sensor) is mounted to the transmission case (from
the outside of the case). It detects the front wheel speed and sends sine wave signals (16 pulses
per rotation) to TCM.
The TCM converts the signals into 4-pulse normal wave signals and outputs them to the engine
control module (ECM) and the combination meter.




                                                                                           B3H0915B



H: ATF TEMPERATURE SENSOR
This sensor is mounted to the control valve in the transmission. It detects temperature change as
an analog electrical signal. The output characteristics of the sensor are shown below.




                                                                                           B3H0916A




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                      LEGACY (W2260BE_SGML Complete)



3-2      [M11I0]                   MECHANISM      AND FUNCTION
11. Electronic-Hydraulic Control System


I: TORQUE CONVERTER TURBINE SPEED SENSOR
The torque converter turbine speed sensor (output shaft rotation sensor) is mounted to the trans-
mission case (from the outside of the case).
The sensor reads the rotation speed of the periphery of the high clutch drum coupled to the input
shaft, and sends sine wave signals (32 pulses per rotation) to the TCM. The TCM calculates the
proportion of the input shaft speed to the vehicle speed and determines whether the shifting is to
be made or not.




                                                                                                B3H0999A




J: INHIBITOR SWITCH
The inhibitor switch assures safety when starting the engine. This switch is mounted on the right
side of the transmission case, and is operated by the range selector lever.
When the selector lever is set to "P" or "N", the electrical circuit is connected in the inhibitor switch
and the starter circuit is energized for cranking the engine.
When the selector lever is set to "R", "D", "3", "2", or "1" range, the electrical circuit is disconnected
in the inhibitor switch. Hence engine cranking is disabled. In the "R" range, the backup light circuit
is completed in the switch, and the backup lights come on.
In addition to the above function, the inhibitor switch incorporates a circuit for detecting the se-
lected range position and sending the range signal to the TCM.




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                               MECHANISM AND FUNCTION                                [M11K0]      3-2
                                                              11. Electronic-Hydraulic Control System




                                                                                           B3H0016B

    Range position          Pin No.
                            (4) 



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