Subaru LEGACY 2002 Quick Reference Index page 285

B: INPUT SIGNALS
Signal name
Throttle position sensor
Front vehicle speed sensor
(located on transmission case)
Rear vehicle speed sensor
(located on extension case)
Engine speed signal
Inhibitor switch
ATF temperature sensor
FWD switch (MPT models)
ABS signal
Cruise control signal
Torque converter turbine speed
sensor
Torque control cut signal
Intake manifold pressure signal
HOLD switch
POWER switch
Kickdown switch
TCS signal (VTD models)
VDC signal
(VTD models)
Steering angle sensor (VTD models)
Yaw-rate and lateral G sensor
(VTD models)
Brake switch
ELECTROHYDRAULIC CONTROL SYSTEM
Indicates the throttle valve position. This signal is used to determine shift point, line
pressure, and lock-up engaging vehicle speed, which vary with engine load.
Indicates the vehicle speed. This signal is used for control of gear shifting, lock-up en-
gaging, line pressure, and transfer clutch operation.
Used to control transfer clutch, and also as backup signal in case of failure of front ve-
hicle speed sensor.
Indicates the engine speed. This signal is used for control of lock-up clutch to ensure
smooth engagement.
Used to determine gears and line pressures in each of ranges "P", "R", "N", "D", "3", "2"
and "1".
Indicates the ATF temperature. This signal is used for inhibition of lock-up, release of
OD and determination of ATF temperature.
Used to change the mode from AWD to FWD. Also used to adapt the vehicle to FWD
tester roller. Changeover from AWD to FWD can be made by inserting a fuse into the
fuse holder.
Used when ABS is operating to optimize ABS control. In this control, transfer clutch
torque load capacity is adjusted to eliminate the influence of engine braking and reduce
the degree of coupling between front and rear wheels.
Indicates operation of cruise control system. It is used to expand "4th" operating range.
Tells the rotation speed of the input shaft. The proportion of this speed to the vehicle
speed determines whether shifting should be made or not.
Sent from engine control module (ECM) to TCM to inhibit the torque control.
Used to determine line pressure of gear shifting.
With this switch "ON", the vehicle starts in 2nd gear (if the D, 3 or 2 range is selected),
which facilitates drive away on a slippery road.
With this switch "ON", the TCM controls gear shifting in the POWER mode which is
convenient when rapid acceleration or great power is required.
Indicates full throttle opening. TCM uses this signal to make kickdown control.
Used when TCS is operating to optimize TCS control. In this control, transfer clutch
torque is controlled to eliminate the influence of engine braking and reduce the degree
of coupling between front and rear wheels.
Used when VDC is operating to optimize VDC control. In this control, transfer clutch
torque is controlled to eliminate the influence of engine braking and reduce the degree
of coupling between front and rear wheels.
Used to monitor the vehicle behavior and send signals for transfer control.
Used to monitor the vehicle behavior and send signals for transfer control.
If this signal is issued during downhill driving, TCM makes shift down control, causing
the vehicle speed to be reduced.
Major function
AT-9
Automatic Transmission