Subaru XT 1988 Service Manual page 567

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3-2
®
Inhibitor switch
If two signals are inputted due to inhibitor switch failure,
the vehicle can be driven under the following priority.
D
>
N (P)
>
R
>
3
>
2
Same as with "2nd" range if "1st hold" switch is faulty.
Normal state
Shift position
1 2
Gear
0 0 1 st
X 0
2nd
"D" range
X X 3rd
0 X 4th
0 0
1 st
"3" range X 0 2nd
X X 3rd
0 0 1st
1 st hold switch
X 0 2nd
released
X X 3rd
"2" range
0 0 1 st
1 st hold switch
X 0
2nd
operated
X X 3rd
0: Energized X : Non-energized Failed
®
Duty sol. A (Line pressure)
If duty solenoid A fails, the solenoid is turned OFF and line
pressure is raised to maximum to enable vehicle operation.
®
Duty sol. B (Lock-up)
If duty solenoid B fails, the solenoid is turned OF F and lock-
up is released_
(J) Sol. 3 (Overrunning clutch)
If the overrunning clutch solenoid fails, the solenoid is turned
OFF. The overrunning clutch will engage so that the engine
brake will be applied when reducing vehicle speed.
@
Duty sol. C (Transfer)
When the duty solenoid C becomes inoperative, it turns OFF.
This causes maximum oil pressure to be applied to the transfer
clutch so that the power is always transmitted to rear axles.
(Direct-coupling 4WD)
@
Sol 1 (shift) and sol. 2 (shift)
If trouble occurs in either solenoid, the other one is turned
OFF to attain the following gear setting to allow vehicle
operation. Should trouble occur in both solenoids, the
hydraulic circuit operates mechanically.
Faulty solenoid 1 Faulty solenoid 2 Faulty solenoids 1,2
1
-
-
-
-
-
-
-
-
-
-
-
-
-
53
2
Gear
1 2
Gear
1 2
Gear
O~X
3rd
O~X - 3rd - -
3rd
O~X
3rd
X -
3rd
-
-
3rd
X
3rd
X
-
3rd
-
-
3rd
X 3rd
O~X
-
3rd
-
-
3rd
~X
3rd
O~X
-
3rd
- -
3rd
O~X
3rd
X
-
3rd
- -
3rd
X 3rd X
-
3rd
- -
3rd
O~X
3rd
O~X -
3rd
-
-
3rd
O~X
3rd
X
-
3rd
- -
3rd
X 3rd X
-
3rd
-
-
3rd
~X
3rd
O~X -
3rd
-
-
3rd
O~X
3rd
X -
3rd
-
-
3rd
X 3rd X
- 3rd
-
-
3rd
4) THROTTLE SENSOR
The throttle sensor provides electrical signals corresponding to
the throttle opening. It has the following characteristics. The
throttle opening and accelerator depression speed are detected
by th is throttle sensor output.
4.5+---~~
Output
voltage
(V)
O.5+-------~--------------------~~
Throttle opening (Degree)
Fig.
73
L3-649