Subaru 2002 Impreza Service Manual page 248

TRANSMISSION CONTROL MODULE (TCM)
Automatic Transmission
K: AWD TRANSFER CLUTCH CONTROL (NON-TURBO MO DEL)
Control item Type of control
Gear position Remarks
Normal control
Regulates transfer clutch pressure in re-
sponse to throttle position and vehicle
speed.
1 Basic control
1 st thru 4th and reverse
Duty ratio
NF036'
2 1 range control
Increases transfer clutch pressure above
basic control pressure.
1
st
Increases transfer clutch pressure to the
same level as in the 1 range immediately
after a slip is detected.
1 st
thru 4th and reverse
Release:
Nhen running faster than the set ve-
iicle speed with fully closed throttle
3
-
4
. _
Slipcontrol
Turning control
Decreases transfer clutch pressure upon
detection of a turn.
1st thru 4th and reverse
5
ABS control
Regulates to the specified transfer clutch
pressure quickly when the ABS signal is
input.
1st thru 4th and reverse
P and N range con-
trol
Regulates to the specified transfer clutch
pressure quickly when shifted to the P or N
range.
P and N 6
I
output
interface
circuit
c
converter
Throttle position sensor interface
ATF
-1
temperature sensor
b
Rear vehicle speed sensor
(rear wheel rpm)
I
I
(front wheel rpm)
CPU
Transfer
clutch
I
I I I I
l + * l
Input
I
Inhibitor switch
Memory
I
I
i
I
circuit
I
I
interface
FWD switch
I
t
Brake switch
ABS signal
I
Constant
voltage source
L
i
I
I
NF0466
AT-26