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The 3-4 shift valve also switches during 1-2 and 2-1 gear-
shifts where its function is to apply the overrun clutch (C4)
in second gear but to release it in first gear.
Note that the C4 clutch is applied in Manual 1 by virtue of
the manual valve and the 1-2 shift valve. Refer to "1-2 Shift
Valve" in this section.
4-3 sequence valve
The 4-3 sequence valve is a two position spring loaded
valve. It switches during 3-4 and 4-3 gearshifts although it
performs no function during the 3-4 shift.
During the 4-3 shift the 4-3 sequence valve delays the con-
nection of the Clutch Apply Feed (CAF) circuit to the B1R
circuit until the B1R circuit has been fully pressurized by
using the third gear circuit. This prevents objectionable en-
gine flare on completion of the 4-3 gearshift.
Solenoid supply pressure regulator valve
The solenoid supply pressure regulator valve supplies a
constant pressure to all solenoids (S1 to S7). Line pres-
sure is used as the feeding oil to this regulator and the
output is termed line 500.
Line pressure control valve
Line pressure is controlled by S6, which acts as the line
pressure control valve. When S6 pressure is applied to
the end of the Primary Regulator Valve (PRV), it is op-
posed by spring force and causes LOW line pressure for
light throttle application and cruising.
BTRA 4 AUTO TRANSMISSION
REXTON SM - 2004.4
Heavy throttle application causes the normally open S6 to
open (switch Off) thus closing line 500 and opening S6 to
exhaust. Removal of S6 pressure from the PRV results in
HIGH line pressure.
Y220_3A2130
Clutch apply feed regulator valve
The clutch apply feed regulator valve is a fixed ratio (2.25:
1) valve. This valve provides a regulated pressure to the C1
clutch and controls the change rate of the clutch state to
give the desired shift quality.
Third gear oil supplied to the valve is regulated to pro-vide
an output pressure, Clutch Apply Feed (CAF) pres-sure,
of 2.25 times the S5 signal pressure when S3 is ON. When
S3 is OFF, the output pressure is 2.25 times the line 500
pressure.
Y220_3A2140
Band apply feed regulator valve
The band apply feed regulator valve is a fixed ratio (1.4:1)
valve. It provides a regulated pressure to the front servo,
and controls the change rate of the front band (B1) state
to give the desired shift quality.
Second gear oil supplied to the valve is regulated to pro-
vide an output pressure, Band Apply Feed (BAF) pressure,
of 1.4 times the S5 signal pressure when S4 is ON. When
S4 is OFF the output pressure is 1.4 times the line 500
pressure.
3A2-13
Y220_3A2150
Y220_3A2160
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
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