Jeep Wrangler TJ. Manual - part 514

REMOVAL

(1) Remove transmission and torque converter

from vehicle. (Refer to 21 - TRANSMISSION/AUTO-
MATIC - 45RFE/545RFE - REMOVAL)

(2) Place a suitable drain pan under the converter

housing end of the transmission.

CAUTION: Verify that transmission is secure on the
lifting device or work surface, the center of gravity
of the transmission will shift when the torque con-
verter is removed creating an unstable condition.
The torque converter is a heavy unit. Use caution
when separating the torque converter from the
transmission.

(3) Pull the torque converter forward until the cen-

ter hub clears the oil pump seal.

(4) Separate the torque converter from the trans-

mission.

INSTALLATION

NOTE: Check converter hub and drive notches for
sharp edges, burrs, scratches, or nicks. Polish the
hub and notches with 320/400 grit paper or crocus
cloth if necessary. The hub must be smooth to
avoid damaging the pump seal at installation.

(1) Lubricate oil pump seal lip with transmission

fluid.

(2) Place torque converter in position on transmis-

sion.

CAUTION: Do not damage oil pump seal or bushing
while inserting torque converter into the front of the
transmission.

(3) Align torque converter to oil pump seal open-

ing.

(4) Insert torque converter hub into oil pump.
(5) While pushing torque converter inward, rotate

converter until converter is fully seated in the oil
pump gears.

(6) Check converter seating with a scale (1) and

straightedge (2) (Fig. 251). Surface of converter lugs
should be 1/2 in. to rear of straightedge when con-
verter is fully seated.

(7) If necessary, temporarily secure converter with

C-clamp attached to the converter housing.

(8) Install the transmission in the vehicle.
(9) Fill the transmission with the recommended

fluid.

TRANSMISSION CONTROL
RELAY

DESCRIPTION

The relay is supplied fused B+ voltage, energized

by the TCM, and is used to supply power to the sole-
noid pack when the transmission is in normal oper-
ating mode.

Fig. 250 Stator Operation

1 - DIRECTION STATOR WILL FREE WHEEL DUE TO OIL
PUSHING ON BACKSIDE OF VANES
2 - FRONT OF ENGINE
3 - INCREASED ANGLE AS OIL STRIKES VANES
4 - DIRECTION STATOR IS LOCKED UP DUE TO OIL PUSHING
AGAINST STATOR VANES

Fig. 251 Checking Torque Converter Seating -

Typical

1 - SCALE
2 - STRAIGHTEDGE

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AUTOMATIC TRANSMISSION - 42RLE

TORQUE CONVERTER (Continued)

OPERATION

When the relay is “off”, no power is supplied to the

solenoid pack and the transmission is in “limp-in”
mode. After a controller reset, the TCM energizes the
relay. Prior to this, the TCM verifies that the con-
tacts are open by checking for no voltage at the
switched battery terminals. After this is verified, the
voltage at the solenoid pack pressure switches is
checked. After the relay is energized, the TCM mon-
itors the terminals to verify that the voltage is
greater than 3 volts.

TRANSMISSION RANGE
SENSOR

DESCRIPTION

The Transmission Range Sensor (TRS) (2) (Fig.

252) is mounted to the top of the valve body inside
the transmission and can only be serviced by remov-
ing the valve body assembly. The electrical connector
extends through the transmission case.

The Transmission Range Sensor (TRS) has four

switch contacts that monitor shift lever position and
send the information to the PCM.

OPERATION

The Transmission Range Sensor (TRS) communi-

cates shift lever position (SLP) to the TCM as a com-
bination of open and closed switches. Each shift lever
position has an assigned combination of switch states
(open/closed) that the TCM receives from four sense
circuits. The TCM interprets this information and
determines the appropriate transmission gear posi-
tion and shift schedule.

Since there are four switches, there are 16 possible

combinations of open and closed switches (codes).
Seven of these codes are related to gear position and
three are recognized as “between gear” codes. This
results in six codes which should never occur. These
are called “invalid” codes. An invalid code will result
in a DTC, and the TCM will then determine the shift
lever position based on pressure switch data. This
allows reasonably normal transmission operation
with a TRS failure.

TRS SWITCH STATES

SLP

T42

T41

Fig. 252 Valve Body Assembly

1 - SOLENOID/PRESSURE SWITCH ASSEMBLY
2 - TRS
3 - TRANSFER PLATE
4 - SEPARATOR PLATE
5 - VALVE BODY

AUTOMATIC TRANSMISSION - 42RLE

21 - 147

TRANSMISSION CONTROL RELAY (Continued)

REMOVAL

(1) Remove valve body assembly from vehicle.

(Refer

TRANSMISSION/AUTOMATIC

42RLE/VALVE BODY - REMOVAL)

(2) Remove the manual shaft seal (1) (Fig. 253).

(3) Remove manual shaft/TRS retaining screw (1)

(Fig. 254).

(4) Slide TRS off of manual valve shaft.

INSTALLATION

(1) Install the TRS (2) to the manual shaft. Make

sure TRS locating pin rests in manual valve bore
slot.

(2) Install the TRS/manual shaft retaining screw

(1) (Fig. 255) and torque to 5 N·m (45 in. lbs.) torque.

(3) Install the manual shaft seal (1) (Fig. 256).
(4) Install valve body to the transmission. (Refer to

21 - TRANSMISSION//AUTOMATIC - 42RLE/VALVE
BODY - INSTALLATION)

Fig. 253 Manual Shaft Seal - Typical

1 - SEAL
2 - MANUAL SHAFT

Fig. 254 Manual Shaft Retaining Screw

1 - SCREW
2 - TRS

Fig. 255 Manual Shaft Retaining Screw

1 - SCREW
2 - TRS

Fig. 256 Manual Shaft Seal - Typical

1 - SEAL
2 - MANUAL SHAFT

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AUTOMATIC TRANSMISSION - 42RLE

TRANSMISSION RANGE SENSOR (Continued)

TRANSMISSION
TEMPERATURE SENSOR

DESCRIPTION

The transmission temperature sensor (2) (Fig. 257)

is located in the transmission range sensor (1) and
communicates transmission sump temperature to the
TCM.

OPERATION

The transmission range sensor (TRS) has an inte-

grated thermistor that the TCM uses to monitor the
transmission’s sump temperature. Since fluid tem-
perature can affect transmission shift quality and
convertor lock up, the TCM requires this information
to determine which shift schedule to operate in. The
TCM also monitors this temperature data so it can
energize the vehicle cooling fan(s) when a transmis-
sion “overheat” condition exists. If the thermistor cir-
cuit fails, the TCM will revert to calculated oil
temperature usage.

CALCULATED TEMPERATURE

A failure in the temperature sensor or circuit will

result in calculated temperature being substituted for
actual temperature. Calculated temperature is a pre-
dicted fluid temperature which is calculated from a
combination of inputs:

• Battery (ambient) temperature

• Engine coolant temperature

• In-gear run time since start-up

VALVE BODY

DESCRIPTION

The valve body assembly (Fig. 258) consists of a

cast aluminum valve body (5),separator plate (4), and
transfer plate (3). The valve body contains valves and
check balls that control fluid delivery to the torque
converter clutch, solenoid/pressure switch assembly,
and frictional clutches.

Also mounted to the valve body assembly are the

solenoid/pressure switch assembly and the transmis-
sion range sensor (2) (Fig. 258).

The valves contained within the valve body (1)

include the following (Fig. 259):

• Regulator valve(2)

• Solenoid switch valve(7)

• Manual valve(5)

• Converter clutch switch valve(6)

• Converter clutch control valve(4)

• Torque converter regulator valve(2)

• Low/Reverse switch valve(3)
In addition, the valve body also contains the ther-

mal valve, #2, 3, 4 & 5 check balls and the 2/4 accu-
mulator assembly.

Fig. 257 Transmission Temperature Sensor

1 - TRANSMISSION RANGE SENSOR
2 - TEMPERATURE SENSOR

Fig. 258 Valve Body Assembly

1 - SOLENOID/PRESSURE SWITCH ASSEMBLY
2 - TRS
3 - TRANSFER PLATE
4 - SEPARATOR PLATE
5 - VALVE BODY

AUTOMATIC TRANSMISSION - 42RLE

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