Jeep Wrangler TJ. Manual — part 515
OPERATION
NOTE: (Refer to 21 - TRANSMISSION/AUTOMATIC -
42RLE - SCHEMATICS AND DIAGRAMS) for a visual
aid in determining valve location, operation and
design.
THERMAL VALVE
The thermal valve (1) (Fig. 260) is a bi-metallic
shudder valve that helps control the venting rate of
oil pressure in the underdrive clutch passage during
release of the clutch. When the oil temperature is
approximately 20 degrees Fahrenheit or less, the
valve is fully open to assist in venting oil past the U1
orifice (2). At temperatures above 20 degrees, the
valve starts to close and becomes fully closed at
approximately 140 degrees. The thermal valve is
located in the transfer plate of the valve body.
Fig. 259 Valve Body - Exploded
1 - VALVE BODY
2 - T/C REGULATOR VALVE
3 - L/R SWITCH VALVE
4 - CONVERTER CLUTCH CONTROL VALVE
5 - MANUAL VALVE
6 - CONVERTER CLUTCH SWITCH VALVE
7 - SOLENOID SWITCH VALVE
8 - REGULATOR VALVE
Fig. 260 Thermal Valve
1 - THERMAL VALVE
2 - U1 ORIFICE
3 - NUMBER 2 CHECK BALL
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AUTOMATIC TRANSMISSION - 42RLE
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VALVE BODY (Continued)
REGULATOR VALVE
The regulator valve (9) (Fig. 261) controls hydrau-
lic pressure in the transmission. It receives unregu-
lated pressure from the pump (6), which works
against spring tension (8) to maintain oil at specific
pressures. A system of sleeves and ports allows the
regulator valve to work at one of three predeter-
mined pressure levels. Regulated oil pressure is also
referred to as “line pressure.”
SOLENOID SWITCH VALVE
The solenoid switch valve (Fig. 262) controls line
pressure from the LR/CC solenoid (4). In one posi-
tion, it allows the low/reverse clutch to be pressur-
ized. In the other, it directs line pressure to the
converter control and converter clutch valves (7).
Fig. 261 Regulator Valve
1 - FROM OVERDRIVE CLUTCH CIRCUIT
2 - FROM MANUAL VALVE
3 - HYDRAULIC PRESSURE
4 - FILTER
5 - PUMP INLET
6 - PUMP OUTLET
7 - OIL PRESSURE REGULATED AT THIS POINT
8 - SPRING TENSION
9 - REGULATOR VALVE
10 - TORQUE CONVERTER CONTROL VALVE
Fig. 262 Solenoid Switch Valve De-Energized
1 - 2/4 CLUTCH
2 - MANUAL VALVE
3 - UD CLUTCH
4 - LR/CC SOLENOID DE-ENERGIZED
5 - MANUAL VALVE
6 - LINE PRESSURE
7 - CONVERTER CLUTCH SWITCH AND CONTROL VALVES
8 - LR CLUTCH
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AUTOMATIC TRANSMISSION - 42RLE
21 - 151
VALVE BODY (Continued)
MANUAL VALVE
The manual valve (4) (Fig. 263) is operated by the
mechanical shift linkage. Its primary responsibility is
to send line pressure to the appropriate hydraulic cir-
cuits and solenoids. The valve has three operating
ranges or positions.
CONVERTER CLUTCH SWITCH VALVE
The main responsibility of the converter clutch
switch valve (10) (Fig. 264) is to control hydraulic
pressure applied to the front (off) side of the con-
verter clutch piston. Line pressure from the regulator
valve (5) is fed to the torque converter regulator
valve (8). The pressure is then directed to the con-
verter clutch switch valve (10) and to the front side
of the converter clutch piston. This pressure pushes
the piston back and disengages the converter clutch.
CONVERTER CLUTCH CONTROL VALVE
The converter clutch control valve (5) (Fig. 265)
controls the back (on) side of the torque converter
clutch (1). When the controller energizes or modu-
lates the LR/CC solenoid to apply the converter
clutch piston, both the converter clutch control valve
(5) and the converter control valve move, allowing
pressure to be applied to the back side of the clutch.
Fig. 263 Manual Valve
1 - UD CLUTCH
2 - LR/CC CLUTCH
3 - REVERSE CLUTCH
4 - MANUAL VALVE
5 - REGULATOR VALVE
6 - REGULATOR VALVE
7 - CONVERTER CLUTCH CONTROL VALVE
8 - 2/4 CLUTCH
9 - 2/4 - L/R SOLENOID
10 - L/R CLUTCH
Fig. 264 Converter Clutch Switch Valve
1 - CONVERTER CLUTCH
2 - TORQUE CONVERTER
3 - LR CLUTCH
4 - DRIBBLERS
5 - REGULATOR VALVE
6 - SOLENOID SWITCH VALVE
7 - CONVERTER CLUTCH CONTROL VALVE
8 - TORQUE CONVERTER REGULATOR VALVE
9 - CONVERTER CLUTCH CONTROL VALVE
10 - CONVERTER CLUTCH SWITCH VALVE
11 - BYPASS VALVE
12 - LUBE
13 - COOLER
Fig. 265 Converter Clutch Control Valve
1 - CONVERTER CLUTCH
2 - TORQUE CONVERTER
3 - LR/CC SOLENOID
4 - FROM MANUAL VALVE
5 - CONVERTER CLUTCH CONTROL VALVE
6 - TORQUE CONVERTER REGULATOR VALVE
7 - CONVERTER CLUTCH SWITCH VALVE
8 - BYPASS VALVE
9 - COOLER
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AUTOMATIC TRANSMISSION - 42RLE
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VALVE BODY (Continued)
T/C REGULATOR VALVE
The torque converter regulator valve slightly regu-
lates the flow of fluid to the torque converter.
LOW/REVERSE SWITCH VALVE
The low/reverse clutch is applied from different
sources, depending on whether low (1st) gear or
reverse is selected. The low/reverse switch valve
alternates positions depending on from which direc-
tion fluid pressure is applied. By design, when the
valve is shifted by fluid pressure from one channel,
the opposing channel is blocked. The switch valve
alienates the possibility of a sticking ball check, thus
providing consistent application of the low/reverse
clutch under these operating conditions.
REMOVAL
NOTE: If valve body is being reconditioned or
replaced, it is necessary to perform the Quick Learn
Procedure. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL
MODULES/TRANSMISSION
CONTROL
MODULE - STANDARD PROCEDURE)
(1) Disconnect the TRS and solenoid wiring con-
nectors.
(2) Disconnect the shift cable from the shift lever
(at the transmission).
(3) Move the manual shift lever clockwise as far as
it will go. This should be one position past the L posi-
tion. Then remove the manual shift lever.
NOTE: One of the oil pan bolts has a sealing patch
applied from the factory. Separate this bolts for
reuse.
(4) Remove transmission pan bolts (2) (Fig. 266).
(5) Remove transmission oil pan (1) (Fig. 267).
(6) Remove oil filter (1) (Fig. 268) from valve body.
It is held in place by two screws.
Fig. 266 Remove Transmission Oil Pan Bolts
1 - TRANSMISSION OIL PAN
2 - BOLTS
Fig. 267 Remove Transmission Oil Pan
1 - TRANSMISSION OIL PAN
Fig. 268 Remove Transmission Filter
1 - TRANSMISSION FILTER
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AUTOMATIC TRANSMISSION - 42RLE
21 - 153
VALVE BODY (Continued)
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