Jeep Grand Cherokee WK. Manual — part 1561
SPECIFICATIONS
TRANSFER CASE - NV245
TORQUE SPECIFICATIONS
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Bolt, Crossmember
41-47
30.2-34.7
-
Plug, Clutch Lever Rail
20-34
15-25
-
Plugs, Drain/Fill
20-34
15-25
-
Bolts, Case Half
25-28
18.5-20.5
-
Nut, Companion Flange
122-176
90-130
-
Bolts, Rear Cover
25-28
18.5-20.5
-
Nuts, T-case mount stud
33-41
24.3-30.2
-
Bolts, Shift Motor and
Mode Sensor
25-28
18.5-20.5
-
Screws, Chain Guide
5-8
-
44-71
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SPECIAL TOOLS - NV245
Holder, Flange - C-3281
Installer, Seal - C-3972A
Handle, Universal - C-4171
Installer, Seal - C-4210
Installer, Bushing - 5066
Installer, Seal - 6560
Installer, Seal - 8281
Installer, Seal - 9672
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FLUID
STANDARD PROCEDURE - FLUID DRAIN/REFILL
The fill and drain plugs are both in the rear case.
1. Raise vehicle.
2. Position drain pan under transfer case.
3. Remove drain and fill plugs and drain lubricant
completely.
4. Install drain plug. Tighten plug to 20-34 N·m (15-25
ft. lbs.).
5. Remove drain pan.
6. Fill transfer case to bottom edge of fill plug opening
with the required fluid. (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES - DESCRIPTION)
7. Install and tighten fill plug to 20-34 N·m (15-25 ft.
lbs.).
8. Lower vehicle.
SEAL-FRONT OUTPUT SHAFT
REMOVAL
The front output shaft seal cannot be serviced in the vehicle. The transfer case must be disassembled to remove
the front output shaft and seal.
SENSOR-MODE
DESCRIPTION
The transfer case mode sensor (3) provides the Final
Drive Control Module (FDCM) feedback about the
position of the transfer case. The sensor consists of a
linear analog position sensor that converts the motor
output shaft position into a DC signal. The sensor may
rotate a full 360 degrees. The operating envelope or
sector rotation is -5 to 180 degrees. The FDCM must
supply 5VDC (+/- 0.5v) to the sensor whenever the
FDCM is not in sleep mode and monitors the shift
motor position. The sensor position is monitored when
the ignition is in the RUN position and for 10 seconds
after the ignition is shifted to the OFF position. The
sensor is mechanically linked to the shaft of the cam
which allows the transfer case to shift. The mode sen-
sor will draw less than 20 mA of current during
operation.
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OPERATION
During normal vehicle operation, the Final Drive Control Module (FDCM) monitors the mode sensor outputs at least
every 2 milliseconds when the shift motor is stationary or active.
Refer to SHAFT ANGLE vs. TRANSFER CASE POSITION for the relative angles of the transfer case shift sector
versus the interpreted transfer case gear operating mode.
SHAFT ANGLE vs. TRANSFER CASE POSITION
Shaft Angle (Degrees)
Transfer Case Position
0
AWD
-20
4LOW
NOTE: All the parameter voltages referred to in the following information are calibrated items in the con-
troller software and are subject to change.
NOTE: For a further explanation of Phase 1 through 3 shifting, (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/TRANSFER CASE CONTROL MODULE - OPERATION).
The following information describes the different mode sensor positions:
•
4LOCK TARGET REGION - The position shall be considered 4LOCK if the voltage is greater than or equal to
encoder_4LOCK_min Volts and it is also less than or equal to encoder_4LOCK_max Volts.
•
AWD TARGET REGION - The position shall be considered AWD if the voltage is greater than or equal to
encoder_AWD_min Volts and it is also less than or equal to encoder_AWD_max Volts.
•
AWD SHIFT LIMIT - During Phase 2 and Phase 3 shifting, shifts may become unidirectional when a voltage is
greater than or equal to encoder_AWD_min Volts has been reached.
The mode sensor position will be considered invalid by the FDCM if the voltage is greater than or equal to encoder-
_High_Range_Limit Volts or if it is less than or equal to encoder_Low_Range_Limit Volts.
If FDCM looses the encoder signal during a shift, the FDCM will respond with a shift back in the opposite direction
of travel to first attempt to find the encoder signal. If the signal is not found, the FDCM will drive motor in AWD
direction for 1 second.
Refer to MODE SENSOR VOLTAGES table for the mode sensor voltages.
MODE SENSOR VOLTAGES
Parameter Name
Voltage
encoder_4LOW_Min
4.19
encoder_4LOW_Max
4.35
encoder_AWD_Min
0.45
encoder_AWD_Max
0.55
encoder_High_Range_Limit
4.51
encoder_Low_Range _Limit
0.20
SWITCH-TRANSFER CASE SELECTOR
DESCRIPTION
The selector switch assembly is mounted in the right side of the shifter assembly and consists of a momentary
contact T-handle for shifts to and from 4LOW and a recessed button for shifts into and out of NEUTRAL.
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