SSANGYONG KYRON 2010.01 Manual page 574

01-26
3410-01
ION 4-SPEED
KYRON 2010.01
▶ Reverse lockout valve
The reverse lockout valve is a two position
valve contained in the upper valve body.
This valve uses S1-S2 pressure as a signal
pressure and controls the application of the
rear band (B2).
While the manual valve is in D, 3, 2 or 1
positions, drive oil is applied to the spring
end of the valve, overriding any signal
pressures and holding the valve in the
lockout position.
application of B2 in any of the forward
driving gears except M1.
When the manual valve is in P, R or N
positions, drive oil is exhausted and the
reverse lockout valve may be toggled by
S1-S2 pressure.
B2 is applied in P, R, and N if the
following conditions are satisfied :
- In P or N, vehicle speed = 3 km/h.
- In R, vehicle speed = 10 km/h.
- Engine speed = 1600 rpm.
- Throttle position = 12 %.
Under these conditions, the TCU switches
solenoids S1 and S2 to OFF. The reverse
lockout valve toggles under the influence of
the S1-S2 pressure, to connect the line
pressure to the B2 feed. Oil is fed to both the
inner and outer apply areas of the rear servo
piston, applying B2.
If any of the above conditions are not
satisfied, the TCU switches solenoids S1 and
S2 to ON.
S1- S2 pressure is exhausted and the valve is
held in the lockout position by the spring. In
this position, engagement of B2 is prohibited.
This feature protects the transmission from
abuse by preventing
application of B2 at high speed, and by
providing a reverse lockout function.
Note that if the transmission is in failure mode,
the rear band will be applied at all times in P,
R and N.
This prevents the
the undesirable