2003 DODGE RAM Service Repair Manual

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Page 2121 of 2895

DODGE RAM 2003 Service Repair Manual THROTTLE VALVE
In all gear positions the throttle valve (Fig. 285) is
being supplied with line pressure. The throttle valve
meters and reduces the line pressure that now
becomes throttle pressure. The

THROTTLE VALVE
In all gear positions the throttle valve (Fig. 285) is
being supplied with line pressure. The throttle valve
meters and reduces the line pressure that now
becomes throttle pressure. The throttle valve is
moved by a spring and the kickdown valve, which is
mechanically connected to the throttle. The larger
the throttle opening, the higher the throttle pressure
(to a maximum of line pressure). The smaller the
throttle opening, the lower the throttle pressure (to a
minimum of zero at idle). As engine speed increases,
the increase in pump speed increases pump output.
The increase in pressure and volume must be regu-
lated to maintain the balance within the transmis-
sion. To do this, throttle pressure is routed to the
reaction area on the right side of the throttle pres-
sure plug (in the regulator valve).
The higher engine speed and line pressure would
open the vent too far and reduce line pressure too
much. Throttle pressure, which increases with engine
speed (throttle opening), is used to oppose the move-
ment of the pressure valve to help control the meter-
ing passage at the vent. The throttle pressure is
combined with spring pressure to reduce the force of
the throttle pressure plug on the pressure valve. The
larger spring at the right closes the regulator valve
passage and maintains or increases line pressure.The increased line pressure works against the reac-
tion area of the line pressure plug and the reaction
area left of land #3 simultaneously moves the regu-
lator valve train to the right and controls the meter-
ing passage.
The kickdown valve, along with the throttle valve,
serve to delay upshifts until the correct vehicle speed
has been reached. It also controls downshifts upon
driver demand, or increased engine load. If these
valves were not in place, the shift points would be at
the same speed for all throttle positions. The kick-
down valve is actuated by a cam connected to the
throttle. This is accomplished through either a link-
age or a cable. The cam forces the kickdown valve
toward the throttle valve compressing the spring
between them and moving the throttle valve. As the
throttle valve land starts to uncover its port, line
pressure is ªmeteredº out into the circuits and viewed
as throttle pressure. This increased throttle pressure
is metered out into the circuits it is applied to: the
1-2 and 2-3 shift valves. When the throttle pressure
is high enough, a 3-2 downshift will occur. If the
vehicle speed is low enough, a 2-1 downshift will
occur.
Fig. 285 Throttle Valve
21 - 282 AUTOMATIC TRANSMISSION - 46REDR
VALVE BODY (Continued)

Page 2122 of 2895

DODGE RAM 2003 Service Repair Manual SWITCH VALVE
When the transmission is in Drive Second before the
TCC application occurs (Fig. 286), the pressure regula-
tor valve is supplying torque converter pressure to the
switch valve. The switc

Page 2123 of 2895

DODGE RAM 2003 Service Repair Manual Once the TCC control valve has moved to the right
(Fig. 287), line pressure is directed to the tip of the
switch valve, forcing the valve to the right. The switch
valve now vents oil from the front of

Page 2124 of 2895

DODGE RAM 2003 Service Repair Manual MANUAL VALVE
The manual valve (Fig. 288) is a relay valve. The
purpose of the manual valve is to direct fluid to the
correct circuit needed for a specific gear or driving
range. The manual valve, as t

MANUAL VALVE
The manual valve (Fig. 288) is a relay valve. The
purpose of the manual valve is to direct fluid to the
correct circuit needed for a specific gear or driving
range. The manual valve, as the name implies, is
manually operated by the driver with a lever located
on the side of the valve body. The valve is connected
mechanically by either a cable or linkage to the gear-
shift mechanism. The valve is held in each of its
positions by a spring-loaded roller or ball that
engages the ªroostercombº of the manual valve lever.
CONVERTER CLUTCH LOCK-UP VALVE
The torque converter clutch (TCC) lock-up valve
controls the back (ON) side of the torque converter
clutch. When the PCM energizes the TCC solenoid to
engage the converter clutch piston, pressure is
applied to the TCC lock-up valve which moves to the
right and applies pressure to the torque converter
clutch.
CONVERTER CLUTCH LOCK-UP TIMING VALVE
The torque converter clutch (TCC) lock-up timing
valve is there to block any 4-3 downshift until the
TCC is completely unlocked and the clutch is disen-
gaged.
SHUTTLE VALVE
The assembly is contained in a bore in the valve
body above the shift valves. When the manual valve
is positioned in the Drive range, throttle pressure
acts on the throttle plug of the shuttle valve (Fig.
280) to move it against a spring, increasing the
spring force on the shuttle valve. During a part or
full throttle 1-2 upshift, the throttle plug is bottomed
by throttle pressure, holding the shuttle valve to the
right against governor pressure, and opening a
by±pass circuit. The shuttle valve controls the qual-
ity of the kickdown shift by restricting the rate of
fluid discharge from the front clutch and servo
release circuits. During a 3-2 kickdown, fluid dis-
charges through the shuttle by-pass circuit. When
the shuttle valve closes the by-pass circuit, fluid dis-
charge is restricted and controlled for the application
of the front band. During a 2-3 ªlift footº upshift, the
shuttle valve by-passes the restriction to allow full
fluid flow through the by-pass groove for a faster
release of the band.
Fig. 288 Manual Valve
DRAUTOMATIC TRANSMISSION - 46RE 21 - 285
VALVE BODY (Continued)

Page 2125 of 2895

DODGE RAM 2003 Service Repair Manual BOOST VALVE
The boost valve (Fig. 289) provides increased fluid
apply pressure to the overdrive clutch during 3-4
upshifts (Fig. 290), and when accelerating in fourth
gear. The boost valve also serves

Page 2126 of 2895

DODGE RAM 2003 Service Repair Manual (12) Lower valve body, rotate valve body away
from case, pull park rod out of sprag, and remove
valve body (Fig. 292).
DISASSEMBLY
CAUTION: Do not clamp any valve body component
in a vise. This practi

Page 2127 of 2895

DODGE RAM 2003 Service Repair Manual (8) Turn valve body over and remove screws that
attach overdrive/converter solenoid assembly to valve
body (Fig. 295).
(9) Remove solenoid and harness assembly from
valve body (Fig. 296).
(10) Remove

Page 2128 of 2895

DODGE RAM 2003 Service Repair Manual (13) Remove park rod E-clip and separate rod from
manual lever (Fig. 300).
(14) Remove E-clip and washer that retains throt-
tle lever shaft in manual lever (Fig. 301).(15) Remove manual lever and thr

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