SSANGYONG Rexton Y200 Manual page 986

5A-14 AUTOMATIC TRANSMISSION
Reverse Lockout Valve
The reverse lockout valve is a two position valve con-
tained in the upper valve body. This valve uses S1-S2
pressure as a signal pressure and controls the applica-
tion 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. This prevents the 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 TCM 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
TCM 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 the undesirable 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.
Pump Cover
KAA5A170
Primary Regulator Valve
The Primary Regulator Valve (PRV) regulates the trans-
mission line pressure (or pump output pressure). This
valve gives either high or low line pressure depending
on whether S6 is switched OFF or ON. When S6 is
switched ON, S6 pressure is applied to the PRV moving
it against spring pressure and opening the line
pressure circuit to the pump suction port resulting in
reduced line pressure.
Low line pressure is used during light throttle applica-
tions and cruising. Heavy throttle will cause S6 to switch
OFF and thereby cause high line pressure.
This stepped line pressure control has no detrimental
effect on shift feel because all shifting pressures are
KAA5A180
controlled by separate band and clutch regulator
valves, and the output of S5.
When reverse gear is selected, both the low and high
line pressure values are boosted to guard against slip-
page. This is achieved by applying reverse oil line
pressure to the PRV to assist the spring load. The
other end of the valve contains ports for line pressure
feedback and S6 pressure.
The PRV also regulates the supply of oil to the
converter via the converter feed port. The cascade
effect of the PRV ensures the first priority of the valve
is to maintain line pressure at very low engine speeds.
When the engine speed increases and the pump
supplies an excess of oil the PRV moves to uncover
the converter feed port thereby pressurizing the
converter. If there is an excess of oil for the
transmission's needs then the PRV moves further to
allow oil to return to the suction port.
KAA5A190
SSANGYONG Y200