Jeep Liberty KJ. Manual — part 1205
SENSOR-INPUT SPEED
DESCRIPTION
The Input and Output Speed Sensors are two-wire magnetic pickup devices that generate AC signals as rotation
occurs. They are mounted in the left side of the transmission case and are considered primary inputs to the Trans-
mission Control Module (TCM).
OPERATION
The Input Speed Sensor provides information on how fast the input shaft is rotating. As the teeth of the input clutch
hub pass by the sensor coil, an AC voltage is generated and sent to the TCM. The TCM interprets this information
as input shaft rpm.
The Output Speed Sensor generates an AC signal in a similar fashion, though its coil is excited by rotation of the
rear planetary carrier lugs. The TCM interprets this information as output shaft rpm.
The TCM compares the input and output speed signals to determine the following:
•
Transmission gear ratio
•
Speed ratio error detection
•
CVI calculation
The TCM also compares the input speed signal and the engine speed signal to determine the following:
•
Torque converter clutch slippage
•
Torque converter element speed ratio
REMOVAL
1. Raise vehicle.
2. Place a suitable fluid catch pan under the transmis-
sion.
3. Remove the wiring connector from the input speed
sensor (3).
4. Remove the bolt holding the input speed sensor to
the transmission case.
5. Remove the input speed sensor (3) from the trans-
mission case.
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KJ
INSTALLATION
1. Install the input speed sensor (3) into the transmis-
sion case.
2. Install the bolt to hold the input speed sensor (3)
into the transmission case. Tighten the bolt to 12
N·m (105 in.lbs.).
3. Install the wiring connector onto the input speed
sensor.
4. Verify the transmission fluid level. Add fluid as nec-
essary.
5. Lower vehicle.
KJ
AUTOMATIC TRANSMISSION - 545RFE
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SENSOR-LINE PRESSURE (LP)
DESCRIPTION
The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force
style solenoid, the Pressure Control Solenoid, mounted on the side of the solenoid and pressure switch assembly.
The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump
back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a
direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feed-
back loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to
achieve the desired line pressure.
OPERATION
The TCM calculates the desired line pressure based upon inputs from the transmission and engine. The TCM cal-
culates the torque input to the transmission and uses that information as the primary input to the calculation. The
line pressure is set to a predetermined value during shifts and when the transmission is in the PARK and NEUTRAL
positions. This is done to ensure consistent shift quality. During all other operation, the actual line pressure is com-
pared to the desired line pressure and adjustments are made to the pressure control solenoid duty cycle.
REMOVAL
1. Raise vehicle.
2. Place a suitable fluid catch pan under the transmis-
sion.
3. Remove the wiring connector from the line pres-
sure sensor (2).
4. Remove the bolt holding the line pressure sensor
(2) to the transmission case.
5. Remove the line pressure sensor (2) from the
transmission case.
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AUTOMATIC TRANSMISSION - 545RFE
KJ
INSTALLATION
1. Install the line pressure sensor (2) into the trans-
mission case.
2. Install the bolt to hold the line pressure sensor (2)
into the transmission case. Tighten the bolt to 12
N·m (105 in.lbs.).
3. Install the wiring connector onto the line pressure
sensor (2).
4. Verify the transmission fluid level. Add fluid as nec-
essary.
5. Lower vehicle.
KJ
AUTOMATIC TRANSMISSION - 545RFE
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