Contents Wiring diagrams Section: Automatic Transmission - Mechanism & Function All sections

MPT MODELS Subaru Legacy BL/BP

MPT MODELS

Control itemsDescription of control
Transmission controlShifting controlBase shift control BASE pattern POWER patternUpshifting and downshifting are set for each range, gear and pattern according to throttle position and vehicle speed.
ABS-in-operation controlGear is shifted in accordance with the vehicle speed when ABS signal is entered.
ATF low temperature controlShifting into 4th gear is prevented when ATF temperature is below the preset value.
Automatic pattern select controlPOWER pattern controlPOWER pattern is selected when throttle opening is changed at a speed exceeding the preset value.
BASE pattern controlWhen throttle opening is changed at a speed less than the preset value, BASE pattern is resumed.
Lockup controlBase lockup controlLockup ON is set for D-range 4th gear; ON/OFF is set for all gears (except D-range 4th) and patterns. Lockup control is performed according to throttle position and vehicle speed. (Basically lockup is OFF during gear shifting.)
Smooth controlSmooth lockup is performed when lockup is switched on.
Line pressure controlOrdinary controlLine pressure is regulated according to throttle position, vehicle speed and range signals.
Shifting controlLine pressure is regulated when shifting to lessen shifting shock.
Starting controlLine pressure is lowered to a minimum so as to reduce engine cranking load.
Shift timing controlGear speed controlON/OFF timing for shift solenoid is controlled.
Lockup controlWhen shifting, the lockup clutch is temporarily released.
Line pressure controlWhen shifting, line pressure is controlled to the optimum level so as to reduce shifting shock.
AWD transfer clutch controlOrdinary transfer controlTransfer clutch pressure is regulated according to the throttle valve angle and vehicle speed.
1 range controlTransfer clutch pressure is increased.
Slip controlImmediately after detecting a slip, transfer clutch pressure is controlled to the same pressure as 1 range. (This control is canceled if V > 60 km/ h (37 MPH), or when throttle valve is closed fully.)
Turning controlTransfer clutch pressure is reduced after detecting a turn.
ABS-in-operation controlTransfer clutch pressure is adjusted to a set level immediately after reception of ABS signal.

LOCKUP CONTROL VALVE CONTROL ITEMS

Control itemsDescription of control
Transmission controlShifting controlBase shift control BASE pattern POWER patternUpshifting and downshifting are set for each range, gear and pattern according to throttle position and vehicle speed.
ABS-in-operation controlGear is shifted in accordance with the vehicle speed when ABS signal is entered.
ATF low temperature controlShifting into 4th gear is prevented when ATF temperature is below the preset value.
Automatic pattern select controlPOWER pattern controlPOWER pattern is selected when throttle opening is changed at a speed exceeding the preset value.
BASE pattern controlWhen throttle opening is changed at a speed less than the preset value, BASE pattern is resumed.
Lockup controlBase lockup controlLockup ON is set for D-range 4th gear; ON/OFF is set for all gears (except D-range 4th) and patterns. Lockup control is performed according to throttle position and vehicle speed. (Basically lockup is OFF during gear shifting.)
Smooth controlSmooth lockup is performed when lockup is switched on.
Line pressure controlOrdinary controlLine pressure is regulated according to throttle position, vehicle speed and range signals.
Shifting controlLine pressure is regulated when shifting to lessen shifting shock.
Starting controlLine pressure is lowered to a minimum so as to reduce engine cranking load.
Shift timing controlGear speed controlON/OFF timing for shift solenoid is controlled.
Lockup controlWhen shifting, the lockup clutch is temporarily released.
Line pressure controlWhen shifting, line pressure is controlled to the optimum level so as to reduce shifting shock.
AWD multi-plate clutch (LSD) controlOrdinary transfer controlMulti-plate clutch (LSD) pressure is regulated according to the torque input to the transfer and the driving condition.
Start controlWhen starting, the LSD pressure is adjusted proportionately to the throttle value angle.
Turning controlWhen the front and rear wheel speed ratio is less than the set value for a vehicle speed, the LSD pressure is decreased.
Slip controlWhen a front or rear wheel starts slipping, the LSD pressure is increased.
ABS-in-operation controlThe LSD pressure is adjusted to the set level immediately after reception of ABS signal.
Base brake controlWhen the brake switch is ON and throttle valve is fully closed, the LSD pressure is lowered.
1 range controlThe LSD pressure is increased to improve driveability.

VTD MODELS SPECIFICATION (NON-TURBO MODELS)

Control itemsDescription of control
Transmission controlShifting controlBase shift control BASE pattern POWER patternUpshifting and downshifting are set for each range, gear and pattern according to throttle position and vehicle speed.
ABS-in-operation controlGear is shifted in accordance with vehicle speed when ABS signal is input.
ATF low temperature controlShifting into 4th gear is prevented when ATF temperature is below the preset value.
Automatic pattern select controlPOWER pattern controlPOWER pattern is selected when the accelerator pedal position exceeds a preset opening.
BASE pattern controlWhen the accelerator pedal position becomes lower than the preset value, BASE pattern is resumed.
Lockup controlBase lockup controlLockup ON is set for D-range 4th gear; ON/OFF is set for all gears (except D-range 4th) and patterns. Lockup control is performed according to throttle position and vehicle speed. (Basically lockup is OFF during gear shifting.)
Line pressure controlOrdinary controlLine pressure is regulated according to throttle position, vehicle speed and range signals.
Shift timing controlGear speed controlControls duty of duty solenoids.
Lockup controlWhen shifting, the lockup clutch is temporarily released.
AWD multi-plate clutch (LSD) controlOrdinary transfer controlMulti-plate clutch (LSD) pressure is regulated according to the torque input to the transfer and the driving condition.
Start controlWhen starting, the LSD pressure is adjusted proportionately to the throttle value angle.
Turning controlWhen the front and rear wheel speed ratio is less than the set value for a vehicle speed, the LSD pressure is decreased.
Slip controlWhen a front or rear wheel starts slipping, the LSD pressure is increased.
ABS-in-operation controlThe LSD pressure is adjusted to the set level immediately after reception of ABS signal.
Base brake controlWhen the brake switch is ON and throttle valve is fully closed, the LSD pressure is lowered.
1 range controlThe LSD pressure is increased to improve driveability.

VTD MODELS SPECIFICATION (TURBO MODELS)