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 MSA5TCD00L18199

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MSA5TCD00L18199


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                       LEGACY (W2260BE_SGML Complete)



3-2      [M1200]                  MECHANISM              AND FUNCTION
12. Transmission Control Module (TCM)


12. Transmission Control Module (TCM)
TCM receives various sensor signals and determines the running conditions of the vehicle. It then
sends control signals to each solenoid according to the preset gearshift characteristic data, lock-
up operation data, and transfer clutch torque data (duty ratio).

A: CONTROL SYSTEM
Control item                                                     Input signal
Shift control             Ordinary shift control                 Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Engine speed
                                                                 Inhibitor switch
                          ABS operation control                  ABS signal
                                                                 Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Brake switch
                          Hydraulic oil temperature control      ATF temperature sensor
                          Reverse inhibit control                Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Inhibitor switch
                          Shift pattern select control           Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Inhibitor switch
                          Grade control                          Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Brake switch
                                                                 Inhibitor switch
Lock-up control           Ordinary lock-up control               Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Engine speed
                                                                 Inhibitor switch
                          Smooth control                         Throttle position sensor
                          Hydraulic oil temperature control      ATF temperature sensor
Oil pressure control      Ordinary pressure control              Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Engine speed
                                                                 Inhibitor switch
                                                                 ATF temperature sensor
                          Shifting control                       Throttle position sensor
                                                                 Vehicle speed sensor 1 (rear)
                                                                 Vehicle speed sensor 2 (front)
                                                                 Engine speed
                                                                 Torque converter turbine speed sensor
                                                                 Inhibitor switch
                                                                 ATF temperature sensor
                          Starting control                       Engine speed
                                                                 ATF temperature sensor
                                                                 Inhibitor switch




                                                         64
                LEGACY (W2260BE_SGML Complete)



                                     MECHANISM AND FUNCTION                            [M12A0]     3-2
                                                                 12. Transmission Control Module (TCM)


Control item                                                   Input signal
Oil pressure control          Learning control                 Shift solenoid A
                                                               Shift solenoid B
                                                               Vehicle speed sensor 1 (rear)
                                                               Vehicle speed sensor 2 (front)
                                                               Throttle position sensor
                                                               Torque converter turbine speed sensor
                                                               ATF temperature sensor
AWD transfer clutch control   Ordinary transfer control        Throttle position sensor
                                                               Vehicle speed sensor 1 (rear)
                                                               Vehicle speed sensor 2 (front)
                                                               Torque converter turbine speed sensor
                                                               Inhibitor switch
                                                               ATF temperature sensor
                                                               FWD switch
                              1st range control                Throttle position sensor
                                                               Vehicle speed sensor 1 (rear)
                                                               Vehicle speed sensor 2 (front)
                                                               Torque converter turbine speed sensor
                                                               Inhibitor switch
                              Slip detection control           Throttle position sensor
                                                               Vehicle speed sensor 1 (rear)
                                                               Vehicle speed sensor 2 (front)
                              Steering control                 Throttle position sensor
                                                               Vehicle speed sensor 1 (rear)
                                                               Vehicle speed sensor 2 (front)
                              ABS operation control            ABS signal
                                                               Throttle position sensor
                                                               Vehicle speed sensor 1 (rear)
                                                               Vehicle speed sensor 2 (front)
                                                               Brake switch




                                                          65
                   LEGACY (W2260BE_SGML Complete)



3-2      [M12B0]                  MECHANISM   AND FUNCTION
12. Transmission Control Module (TCM)


B: SYSTEM DIAGRAM




                                                             B3H1673A




                                              66
             LEGACY (W2260BE_SGML Complete)



                               MECHANISM AND FUNCTION                                  [M12C0]     3-2
                                                                 12. Transmission Control Module (TCM)


C: SHIFT CONTROL
Gearshifting is controlled in response to driving conditions, according to the shift point character-
istic data stored in the TCM. Solenoids are operated at the proper time corresponding to the shift
pattern, throttle position, and vehicle speed for smooth shifting.

NOTE:
When oil temperature is below approximately 10



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