2003 DODGE RAM Service Repair Manual

TPMS reset lumbar support tires ground clearance OBD port oil filter

Page 2105 of 2895

DODGE RAM 2003 Service Repair Manual (7) Remove the TRS mounting bracket (Fig. 262)
from the transmission case.
INSTALLATION
(1) Move the transmission manual shaft lever to
the manual LOW position.
(2) Install the TRS mounting bracket in

Page 2106 of 2895

DODGE RAM 2003 Service Repair Manual TRANSMISSION
TEMPERATURE SENSOR
DESCRIPTION
Transmission fluid temperature readings are sup-
plied to the transmission control module by the ther-
mistor (Fig. 266). The temperature readings are used

TRANSMISSION
TEMPERATURE SENSOR
DESCRIPTION
Transmission fluid temperature readings are sup-
plied to the transmission control module by the ther-
mistor (Fig. 266). The temperature readings are used
to control engagement of the fourth gear overdrive
clutch, the converter clutch, and governor pressure.
Normal resistance value for the thermistor at room
temperature is approximately 2000 ohms.
The thermistor is part of the governor pressure
sensor assembly and is immersed in transmission
fluid at all times.
OPERATION
The PCM prevents engagement of the converter
clutch and overdrive clutch, when fluid temperature
is below approximately 10ÉC (50ÉF).
If fluid temperature exceeds 126ÉC (260ÉF), the
PCM causes a 4-3 downshift and engage the con-
verter clutch. Engagement is according to the third
gear converter clutch engagement schedule.
The overdrive OFF lamp in the instrument panel
illuminates when the shift back to third occurs. The
transmission will not allow fourth gear operation
until fluid temperature decreases to approximately
110ÉC (230ÉF).
VALVE BODY
DESCRIPTION
The valve body consists of a cast aluminum valve
body, a separator plate, and transfer plate. The valve
body contains valves and check balls that control
fluid delivery to the torque converter clutch, bands,
and frictional clutches. The valve body contains the
following components (Fig. 267), (Fig. 268), (Fig.
269), and (Fig. 270):
²Regulator valve
²Regulator valve throttle pressure plug
²Line pressure plug and sleeve
²Kickdown valve
²Kickdown limit valve
²1-2 shift valve
²1-2 control valve
²2-3 shift valve
²2-3 governor plug
²3-4 shift valve
²3-4 timing valve
²3-4 quick fill valve
²3-4 accumulator
²Throttle valve
²Throttle pressure plug
²Switch valve
²Manual valve
²Converter clutch lock-up valve
²Converter clutch lock-up timing Valve
²Shuttle valve
²Shuttle valve throttle plug
²Boost Valve
²10 check balls
By adjusting the spring pressure acting on the reg-
ulator valve, transmission line pressure can be
adjusted.
Fig. 266 Governor Pressure Sensor
1 - GOVERNOR BODY
2 - GOVERNOR PRESSURE SENSOR/TRANSMISSION FLUID
TEMPERATURE THERMISTOR
DRAUTOMATIC TRANSMISSION - 46RE 21 - 267

Page 2107 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 267 Upper Housing Control Valve Locations
1 - UPPER HOUSING 8 - MANUAL VALVE
2 - REGULATOR VALVE 9 - 1-2 GOVERNOR PLUG
3 - SWITCH VALVE 10 - GOVERNOR PLUG COVER
4 - REGULATOR VALVE SPRING 11 - TH

Page 2108 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 268 Shuttle and Boost Valve Locations
1 - SPRING 8 - SHUTTLE VALVE COVER
2 - RETAINER 9 - SHUTTLE VALVE
3 - BOOST VALVE 10 - SHUTTLE VALVE PRIMARY SPRING
4 - BOOST VALVE PLUG 11 - GOVERNOR PLUG C

Page 2109 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 269 Upper Housing Shift Valve and Pressure Plug Locations
1 - UPPER HOUSING 8 - RETAINER
2 - 1-2 SHIFT VALVE AND SPRING 9 - 1-2 SHIFT CONTROL VALVE AND SPRING
3 - 2-3 SHIFT VALVE AND SPRING 10 -

Page 2110 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 270 Lower Housing Shift Valves and Springs
1 - 3-4 ACCUMULATOR HOUSING 11 - TIMING VALVE COVER
2 - 3-4 SHIFT VALVE AND SPRING 12 - PLUG
3 - PLUG 13 - 3-4 TIMING VALVE AND SPRING
4 - SPRING RETAIN

Page 2111 of 2895

DODGE RAM 2003 Service Repair Manual OPERATION
NOTE: Refer to the Hydraulic Schematics for a visual
aid in determining valve location, operation and design.
CHECK BALLS
CHECK BALL
NUMBERDESCRIPTION
1 Allows either the manual valve to put

OPERATION
NOTE: Refer to the Hydraulic Schematics for a visual
aid in determining valve location, operation and design.
CHECK BALLS
CHECK BALL
NUMBERDESCRIPTION
1 Allows either the manual valve to put line pressure on the 1-2 governor plug or the KD Valve to
put WOT line pressure on the 1-2 governor plug.
2 Allows either the manual valve to put line pressure on the 2-3 governor plug or the KD Valve to
put WOT line pressure on the 2-3 governor plug.
3 Allows either the Reverse circuit or the 3rd gear circuit to pressurize the front clutch.
4 Allows either the Manual Low circuit from the Manual Valve or the Reverse from the Manual
Valve circuit to pressurize the rear servo.
5 Directs line pressure to the spring end of the 2-3 shift valve in either Manual Low or Manual
2nd, forcing the downshift to 2nd gear regardless of governor pressure.
6 Provides a by-pass around the front servo orifice so that the servo can release quickly.
7 Provides a by-pass around the rear clutch orifice so that the clutch can release quickly.
8 Directs reverse line pressure through an orifice to the throttle valve eliminating the extra
leakage and insuring that Reverse line pressure pressure will be sufficient.
9 Provides a by-pass around the rear servo orifice so that the servo can release quickly.
10 Allows the lockup clutch to used at WOT in 3rd gear by putting line pressure from the 3-4
Timing Valve on the interlock area of the 2-3 shift valve, thereby preventing a 3rd gear Lock-up
to 2nd gear kickdown.
REGULATOR VALVE
The pressure regulator valve is needed to control
the hydraulic pressure within the system and reduce
the amount of heat produced in the fluid. The pres-
sure regulator valve is located in the valve body near
the manual valve. The pressure regulator valve train
controls the maximum pressure in the lines by
metering the dumping of fluid back into the sump.
Regulated pressure is referred to as ªline pressure.º
The regulator valve (Fig. 271) has a spring on one
end that pushes the valve to the left. This closes a
dump (vent) that is used to lower pressure. The closing
of the dump will cause the oil pressure to increase. Oil
pressure on the opposite end of the valve pushes the
valve to the right, opening the dump and lowering oil
pressure. The result is spring pressure working against
oil pressure to maintain the oil at specific pressures.
With the engine running, fluid flows from the pump to
the pressure regulator valve, manual valve, and the
interconnected circuits. As fluid is sent through pas-
sages to the regulator valve, the pressure pushes the
valve to the right against the large spring. It is also
sent to the reaction areas on the left side of the throttle
pressure plug and the line pressure plug. With the gearselector in the PARK position, fluid recirculates through
the regulator and manual valves back to the sump.
Meanwhile, the torque converter is filled slowly. In
all other gear positions (Fig. 272), fluid flows
between two right side lands to the switch valve and
torque converter. At low pump speeds, the flow is
controlled by the pressure valve groove to reduce
pressure to the torque converter. After the torque
converter and switch valve fill with fluid, the switch
valve becomes the controlling metering device for
torque converter pressure. The regulator valve then
begins to control the line pressure for the other
transmission circuits. The balance of the fluid pres-
sure pushing the valve to the right and the spring
pressure pushing to the left determines the size of
the metering passage at land #2 (land #1 being at
the far right of the valve in the diagram). As fluid
leaks past the land, it moves into a groove connected
to the filter or sump. As the land meters the fluid to
the sump, it causes the pressure to reduce and the
spring decreases the size of the metering passage.
When the size of the metering passage is reduced,
the pressure rises again and the size of the land is
increased again. Pressure is regulated by this con-
stant balance of hydraulic and spring pressure.
21 - 272 AUTOMATIC TRANSMISSION - 46REDR
VALVE BODY (Continued)

Page 2112 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 271 Regulator Valve in PARK Position
Fig. 272 Regulator Valve in NEUTRAL Position
DRAUTOMATIC TRANSMISSION - 46RE 21 - 273
VALVE BODY (Continued)

Load next 8 pages

Page: < prev 1-10 ... 2073-2080 2081-2088 2089-2096 2097-2104 2105-2112 2113-2120 2121-2128 2129-2136 2137-2144 ... 2896 next >

radio antenna keyless entry compression ratio parking sensors warning light cabin filter