Dodge RAM 1500 1998 Owner's Manual page 2110

DR
TRANSMISSION SOLENOID/TRS ASSEMBLY (Continued)
PRESSURE SWITCHES
The TCM relies on five pressure switches to moni-
tor fluid pressure in the L/R, 2C, 4C, UD, and OD
hydraulic circuits. The primary purpose of these
switches is to help the TCM detect when clutch cir-
cuit 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 following charts
45RFE PRESSURE SWITCH STATES and 545RFE
PRESSURE SWITCH STATES :
45RFE PRESSURE SWITCH STATES
GEAR L/R 2C
R OP OP
P/N CL OP
1ST CL* OP
2ND OP CL
2ND
OP OP
PRIME
D OP OP
FOURTH OP OP
*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
R OP OP
P/N CL OP
1ST CL* OP
2ND OP CL
2ND
OP OP
PRIME
D OP OP
4TH OP OP
5TH 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 or closed at the wrong
time in a given gear.
AUTOMATIC TRANSMISSION - 45RFE/545RFE
4C UD OD
OP OP OP
OP OP OP
OP CL OP
OP CL OP
CL CL OP
OP CL CL
CL OP CL
4C UD OD
OP OP OP
OP OP OP
OP CL OP
OP CL OP
CL CL OP
OP CL CL
CL OP CL
OP OP CL
REMOVAL
(1) Remove the valve body from the transmission
(Fig. 127).
Fig. 127 Valve Body Bolts
1 - VALVE BODY TO CASE BOLT (6)
(2) Remove the screws holding the transmission
solenoid/TRS assembly onto the valve body (Fig. 128).
(3) Separate the transmission solenoid/TRS assem-
bly from the valve body.
Fig. 128 Transmission Solenoid/TRS Assembly
1 - SOLENOID PACK BOLTS (15)
21 - 407
Screws