Jeep Liberty KJ. Manual — part 1089
TRANSMISSION RANGE SENSOR
DESCRIPTION
The Transmission Range Sensor (TRS) (2) is mounted
to the top of the valve body inside the transmission
and can only be serviced by removing 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) communicates shift lever position (SLP) to the TCM as a combination 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 position 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 transmis-
sion operation with a TRS failure.
TRS SWITCH STATES
SLP
T42
T41
T3
T1
P
CL
CL
CL
OP
R
CL
OP
OP
OP
N
CL
CL
OP
CL
D
OP
OP
OP
CL
2
OP
OP
CL
OP
1
CL
OP
CL
CL
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AUTOMATIC TRANSMISSION - 42RLE
KJ
REMOVAL
1. Remove valve body assembly from vehicle. (Refer
to 21 - TRANSMISSION/AUTOMATIC - 42RLE/
VALVE BODY - REMOVAL)
2. Remove the manual shaft seal (1).
3. Remove manual shaft/TRS retaining screw (1).
4. Slide TRS off of manual valve shaft.
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AUTOMATIC TRANSMISSION - 42RLE
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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)
and torque to 5 N·m (45 in. lbs.) torque.
3. Install the manual shaft seal (1).
4. Install valve body to the transmission. (Refer to 21
- TRANSMISSION//AUTOMATIC - 42RLE/VALVE
BODY - INSTALLATION)
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AUTOMATIC TRANSMISSION - 42RLE
KJ
TRANSMISSION TEMPERATURE SENSOR
DESCRIPTION
The transmission temperature sensor (2) is located in
the transmission range sensor (1) and communicates
transmission sump temperature to the TCM.
OPERATION
The transmission range sensor (TRS) has an integrated thermistor that the TCM uses to monitor the transmission’s
sump temperature. 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. The TCM also monitors this temperature
data so it can energize the vehicle cooling fan(s) when a transmission “overheat” condition exists. If the thermistor
circuit 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 tem-
perature. Calculated temperature is a predicted fluid temperature which is calculated from a combination of inputs:
•
Battery (ambient) temperature
•
Engine coolant temperature
•
In-gear run time since start-up
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AUTOMATIC TRANSMISSION - 42RLE
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