Jeep Grand Cherokee WK. Manual — part 1398
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 11.9
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.
SENSOR-LINE PRESSURE
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.
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AUTOMATIC TRANSMISSION - 545RFE - SERVICE INFORMATION
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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.
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 11.9
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.
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AUTOMATIC TRANSMISSION - 545RFE - SERVICE INFORMATION
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CLUTCH-LOW/REVERSE
DISASSEMBLY
1. Remove the inner overrunning clutch snap-ring (13) from the low/reverse clutch retainer (5).
2. Remove the outer low/reverse reaction plate flat snap-ring (1.
3. Remove the low/reverse clutch (3, 4) and the overrunning clutch (12) from the low/reverse clutch retainer (5) as
an assembly.
4. Separate the low/reverse clutch (3, 4) from the overrunning clutch (12).
Low/Reverse Clutch Assembly
1 - SNAP-RING (SELECT)
8 - SEAL
2 - REACTION PLATE
9 - BELLEVILLE SPRING
3 - DISC
10 - RETAINER
4 - PLATE
11 - SNAP-RING
5 - L/R CLUTCH RETAINER
12 - OVERRUNNING CLUTCH
6 - SEAL
13 - SNAP-RING
7 - PISTON
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AUTOMATIC TRANSMISSION - 545RFE - SERVICE INFORMATION
WK
5. Remove the overrunning clutch snap-ring (1).
6. Remove the spacer (4) from the overrunning clutch
(3).
7. Separate the inner and outer races (2) of the over-
running clutch (3).
8. Remove the overrunning clutch lower snap-ring.
9. Using Spring Compressor 8285 (2) and a suitable
shop press (1), compress the low/reverse piston
Belleville spring (3) and remove the split retaining
ring holding the Belleville spring into the low/re-
verse clutch retainer.
10. Remove the low/reverse clutch Belleville spring
(3) and piston from the low/reverse clutch retainer.
Use 20 psi of air pressure to remove the piston if
necessary.
CLEANING
Clean the overrunning clutch assembly, clutch cam, and low-reverse clutch retainer. Dry them with compressed air
after cleaning.
INSPECTION
Inspect condition of each clutch part after cleaning. Replace the overrunning clutch roller and spring assembly if any
rollers or springs are worn or damaged, or if the roller cage is distorted, or damaged. Replace the cam if worn,
cracked or damaged.
Replace the low-reverse clutch retainer if the clutch race, roller surface or inside diameter is scored, worn or
damaged.
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AUTOMATIC TRANSMISSION - 545RFE - SERVICE INFORMATION
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