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 MSA5TCD00L18201

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MECHANISM AND FUNCTION [M1400] 3-2
14. Fail-safe Function

14. Fail-safe Function
A fail-safe function is provided to maintain driveability even if trouble should occur in the vehicle
speed sensor, throttle position sensor, inhibitor switch, or any of the solenoids.
D VEHICLE SPEED SENSOR 1 AND 2
A dual speed-sensing system is used. The speed signal is taken from the transmission (output
shaft speed sensor). Even if one sensor system fails, the vehicle can be controlled normally with
the other sensor system.
If both front and rear vehicle speed sensors become faulty, the transmission is fixed in 3rd speed.
D THROTTLE POSITION SENSOR
If throttle position sensor becomes faulty, the throttle opening is fixed at the preset angle.
D INHIBITOR SWITCH
If the plural number of signals are inputted simultaneously due to inhibitor switch failure, the TCM
makes it possible to drive the vehicle in the following conditions.
Order of priority: D > N (P) > R > 3 > 2 > 1 >
Selector
P R N D 3 2 1
position
P range R range N range D range 3 range 2 range 1 range
Input signal signal and signal and signal and signal and signal and signal and signal and
other signal other signal other signal other signal other signal other signal other signal
Driving
P R N D 3 2 1
condition

D SHIFT SOLENOID 1 AND 2
If trouble occurs in either of solenoids 1 and 2, both solenoids are turned OFF, and the vehicle is
made driveable in the 3rd hold range.
If both solenoids should fail, the mechanical hydraulic circuit is used.
D LINE PRESSURE DUTY SOLENOID
If line pressure duty solenoid fails, the solenoid is turned OFF and line pressure is raised to maxi-
mum to enable vehicle operation.
D LOCK-UP DUTY SOLENOID
If lock-up duty solenoid fails, the solenoid is turned OFF and lock-up is released.
D TRANSFER DUTY SOLENOID
When the transfer duty solenoid becomes inoperative, it turns OFF. This causes maximum oil pres-
sure to be applied to the transfer clutch so that the power is always transmitted to rear axles. (Di-
rect-coupling AWD)
D 2-4 BRAKE DUTY SOLENOID
If any trouble occurs in the 2-4 brake duty solenoid, the solenoid is turned off and the vehicle is
made drivable in the 1st and 3rd speeds.

81
3-2 [M1400] MECHANISM AND FUNCTION
14. Fail-safe Function

D LOW-CLUTCH TIMING SOLENOID
If any trouble occurs in the low clutch timing solenoid, the solenoid is turned off and the vehicle
is made drivable in the 1st and 3rd speeds.
D 2-4 BRAKE TIMING SOLENOID
If any trouble occurs in the 2-4 brake timing solenoid, the solenoid is turned off and the vehicle
is made drivable in the 1st and 3rd speeds.

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