DODGE RAM SRT-10 2006 Service Repair Manual

ASSEMBLY-TRANSMISSION SOLENOID/TRS
DESCRIPTION
The transmission solenoid/TRS assembly is internal to
the transmission and mounted on the valve body
assembly. The assembly consists of six solenoids that
control hydraulic pressure to the six friction elements
(transmission clutches), and the torque converter
clutch. The pressure control solenoid is located on the
side of the solenoid/TRS assembly. The solenoid/TRS
assembly also contains five pressure switches that
feed information to the TCM.
OPERATION
SOLENOIDS
Solenoids are used to control the L/R, 2C, 4C, OD, and UD friction elements.The reverse clutch is controlled by
line pressure and the position of the manual valve in the valve body. All thesolenoids are contained within the
Solenoid and Pressure Switch Assembly. The solenoid and pressure switch assembly contains one additional sole-
noid, Multi-Select (MS), which serves primarily to provide 2nd and 3rd gear limp-in operation.
The solenoids receive electrical power from the Transmission Control Relay through a single wire. The TCM ener-
gizes or operates the solenoids individually by grounding the return wireof the solenoid as necessary. When a
solenoid is energized, the solenoid valve shifts, and a fluid passage is opened or closed (vented or applied),
depending on its default operating state. The result is an apply or releaseof a frictional element.
The MS and UD solenoids are normallyapplied to allow transmission limp-inin the event of an electrical failure.
The continuity of the solenoids and circuits are periodically tested. Each solenoid is turned on or off depending on
its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the
circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a
speed ratio or pressure switch error occurs.
PRESSURE SWITCHES
The TCM relies on five pressure switches to monitor fluid pressure in the L/R, 2C, 4C, UD, and OD hydraulic cir-
cuits. The primary purpose of these switches is to help the TCM detect when clutch circuit hydraulic failures occur.
The switches close at 23 psi and open at 11 psi, and simply indicate whether or not pressure exists. The switches
are continuously monitored by the TCM for the correct states (open or closed) in each gear as shown in the fol-
lowing charts 45RFE PRESSURE SWITCH STATES and 545RFE PRESSURE SWITCH STATES :
45RFE PRESSURE SWITCH STATES

GEAR L/R 2C 4C UD OD
ROP OP OP OP OP
P/NCL OP OP OP OP
1STCL* OP OP CL OP
2NDOP CL OP CL OP
2ND PRIMEOP OP CL CL OP
DOP OP OP CL CL
FOURTHOP OP CL OP CL
*L/R is closed if output speed is below 100 rpm in Drive and Manual 2. L/R is open in Manual 1.
545RFE PRESSURE SWITCH STATES
GEAR L/R 2C 4C UD OD
ROP OP OP OP OP
P/NCL OP OP OP OP
1STCL* OP OP CL OP
2NDOP CL OP CL OP
2ND PRIMEOP OP CL CL OP
DOP OP OP CL CL
4THOP OP CL OP CL
5THOP CL OP OP CL
*L/R is closed if output speed is below 100 rpm in Drive and Manual 2. L/R is open in Manual 1.
A Diagnostic Trouble Code (DTC) will set if the TCM senses any switch open orclosed at the wrong time in a given
gear.
REMOVAL
NOTE: If the Transmission Solenoid/TRS Assembly is being replaced, the Quick Learn Procedure must be
performed. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MOD-
ULE - STANDARD PROCEDURE)
1. Remove the valve body from the transmission.
(Refer to 21 - TRANSMISSION/AUTOMATIC -
45RFE/545RFE/VALVE BODY - REMOVAL)

2. Remove the bolts (1) holding the transmission sole-
noid/TRS assembly onto the valve body.
3. Separate the transmission solenoid/TRS assembly
from the valve body.
INSTALLATION
1. Place TRS selector plate in the PARK position.
2. Position the transmission solenoid/TRS assembly
onto the valve body. Be sure that both alignment
dowels are fully seated in the valve body and that
the TRS switch contacts are properly positioned in
the selector plate
3. Install the bolts (1) to hold the transmission sole-
noid/TRS assembly onto the valve body.
4. Tighten the solenoid assembly screws adjacent to
the arrows cast into the bottom of the valve body
first. Tighten the screws to 6 Nꞏm (50 in.lbs.).
5. Tighten the remainder of the solenoid assembly
screws to 6 Nꞏm (50 in.lbs.).
6. Install the valve body into the transmission.

SENSOR-TRANSMISSION TEMPERATURE
DESCRIPTION
The transmission temperature sensor is a thermistor that is integral to the Transmission Range Sensor (TRS).
OPERATION
The transmission temperature sensor is used by the TCM to sense the temperature of the fluid in the sump. Since
fluid temperature can affect transmission shift quality and convertor lock up, the TCM requires this information to
determine which shift schedule to operate in.
Calculated Temperature
A failure in the temperature sensor or circuit will result in calculated temperature being substituted for actual tem-
perature. Calculated temperature is a predicted fluid temperature whichis calculated from a combination of inputs:
Battery (ambient) temperature
Engine coolant temperature
In-gear run time since start-up

BODY-VALVE
DESCRIPTION
The valve body consists of a cast aluminum valve body, a separator plate, and a 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 :
Solenoid switch valve
Manual valve
Low/reverse switch valve
5 Accumulators
Valve Body Components
1 - LOW/REVERSE ACCUMULATOR 6 - OVERDRIVE ACCUMULATOR
2 - LOW/REVERSE SWITCH VALVE 7 - UNDERDRIVE ACCUMULATOR
3 - UPPER VALVE BODY 8 - 4C ACCUMULATOR
4 - MANUAL VALVE 9 - 2C ACCUMULATOR
5 - SOLENOID SWITCH VALVE

7 check balls
OPERATION
NOTE: Refer to the Hydraulic Schematics for a visual aid in determining valve location, operation and
design.
SOLENOID SWITCH VALVE
The Solenoid Switch Valve (SSV) controls the direction of the transmission fluid when the L/R-TCC solenoid is ener-
gized.
The Solenoid Switch Valve controls line pressure from the LR-TCC solenoid. In 1st gear, the SSV will be in the
downshifted position, thus directing fluid to the L/R clutch circuit. In 2nd, 3rd, 4th, and fifth gears, the solenoid switch
valve will be in the upshifted position and directs the fluid into the torque converter clutch (TCC) circuit.
When shifting into 1st gear, a special hydraulic sequence is performed to ensure SSV movement into the down-
shifted position. The L/R pressure switch is monitored to confirm SSV movement. If the movement is not confirmed
(the L/R pressure switch does not close), 2nd gear is substituted for 1st. ADTC will be set after three unsuccessful
attempts are made to get into 1st gear in one given key start.
MANUAL VALVE
The manual valve 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 man-
ual valve, as the name implies, is manually operated
by the driver with a lever located on the top of the
valve body. The valve is connected mechanically by a
cable to the gearshift mechanism. The valve is held in
each of its positions by a roller detent spring (2) that
engages the roostercomb of the TRS selector plate
(1).

LOW/REVERSE SWITCH VALVE
The low/reverse switch valve allows the low/reverse clutch to be operatedby either the LR/CC solenoid or the MS
solenoid.
REMOVAL
NOTE: The valve body can be removed for service without having to remove thetransmission assembly.
The valve body can be disassembled for cleaning and inspection of the individual components. (Refer to 21
- TRANSMISSION/AUTOMATIC - 45RFE/VALVE BODY - DISASSEMBLY)
1. Shift transmission into PARK.
2. Raise vehicle.
3. Disconnect wires at the solenoid and pressure
switch assembly connector.
4. Position drain pan under transmission oil pan.
5. Remove transmission oil pan.
6. Remove the primary oil filter (1) from valve body.
7. Remove bolts (1) attaching valve body to transmis-
sion case.
8. Lower the valve body and work the electrical con-
nector out of transmission case.
9. Separate the valve body from the transmission.

DISASSEMBLY
1. Remove the bolts (1) holding the solenoid and
pressure switch assembly to the valve body. Do not
remove the screws on the top of the solenoid and
pressure switch assembly.
2. Separate the solenoid and pressure switch assem-
bly from the valve body.
3. Remove the screw holding the detent spring (2)
onto the valve body.
4. Remove the detent spring (2) from the valve body.
5. Remove the TRS selector plate (1) from the valve
body and the manual valve.
6. Remove the clutch passage seals (3) from the
valve body, if necessary.

7. Remove the screws holding the accumulator cover onto the valve body.
8. Remove the accumulator springs and pistons (1, 6-9) from the valve body.Note which accumulator piston and
spring belong in each location.
9. Place the valve body on the bench with the transfer
plate upward.
NOTE: The valve body contains seven check balls.
The transfer plate must be placed upward to pre-
vent losing the check balls when the transfer plate
is removed from the valve body.
10. Remove the screws holding the valve body to the
valve body transfer plate.
11. Remove the transfer plate from the valve body.
Note the location of all check balls.
12. Remove the check balls from the valve body.
Valve Body Components
1 - LOW/REVERSE ACCUMULATOR 6 - OVERDRIVE ACCUMULATOR
2 - LOW/REVERSE SWITCH VALVE 7 - UNDERDRIVE ACCUMULATOR
3 - UPPER VALVE BODY 8 - 4C ACCUMULATOR
4 - MANUAL VALVE 9 - 2C ACCUMULATOR
5 - SOLENOID SWITCH VALVE

13. Remove the retainers securing the solenoid switch valve (5), manual valve (4), and the low/reverse switch valve
(2) from the valve body and remove the associated valve and spring. Tag eachvalve and spring combination
with location information to aid in assembly.
Valve Body Components
1 - LOW/REVERSE ACCUMULATOR 6 - OVERDRIVE ACCUMULATOR
2 - LOW/REVERSE SWITCH VALVE 7 - UNDERDRIVE ACCUMULATOR
3 - UPPER VALVE BODY 8 - 4C ACCUMULATOR
4 - MANUAL VALVE 9 - 2C ACCUMULATOR
5 - SOLENOID SWITCH VALVE