Dodge Dakota (R1). Manual — part 730
SELECTOR SWITCH
DESCRIPTION
The selector switch assembly (Fig. 77) is mounted
in the vehicle Instrument Panel (IP) and consists of a
rotary knob connected to a resistive network for the
mode and range shift selections. Also located in this
assembly is a recessed, normally open momentary
switch for making shifts into and out of transfer case
NEUTRAL. A pen, or similar instrument, is used to
make a NEUTRAL shift selection, thus reducing the
likelihood of an inadvertent shift request.
The selector switch also contains four light emit-
ting diode’s (LED’s) to indicate the transfer case posi-
tion and whether a shift is in progress.
OPERATION
As the position of the selector switch varies, the
resistance between the Mode Sensor supply voltage
pin and the Mode Sensor output will vary. Hardware,
software, and calibrations within the Transfer Case
Control Module (TCCM) are provided that interpret
the selector switch resistance as given in the table
below:
SELECTOR SWITCH INTERPRETATION
Step
Resistance
Range (ohms)
Required
Interpretation
A
<200
Shorted
B
400-700
NEUTRAL
C
1050-1450
4LO
D
1850-2300
4H
E
3050-5950
2WD/AWD
(Default)
F
9.5-12.5K
In between
positions
G
>15.5K
Open
For resistances between the ranges B-E shown for
each valid position (T-Case NEUTRAL, 4LO, 4HI,
2WD/AWD), the TCCM may interpret the resistance
as:
• either of the neighboring valid positions.
• as an invalid fault position.
For resistances between the ranges E and F shown
for AWD/2WD and in-between positions, the TCCM
may interpret the resistance as:
• the AWD/2WD position.
• an invalid fault position.
• a valid in-between position.
For resistances between the ranges F and G shown
for in-between positions and fault condition (open),
the TCCM may interpret the resistance as:
• a valid in-between position.
• an invalid fault position.
For resistances between the ranges A and B shown
for the fault condition (short) and , T-Case NEU-
TRAL, the TCCM may interpret the resistance as:
• the T-Case NEUTRAL position.
• an invalid fault position.
The LED’s in the selector assembly are illuminat-
ed/flashed in the following manner to indicate a par-
ticular condition or state.
• A solidly illuminated LED indicates a success-
fully completed shift and the current operating mode
of the transfer case. While a shift has been requested
but not yet completed, the LED for the source trans-
fer case position remains solidly illuminated.
• A flashing operating mode LED for the desired
gear indicates that a shift to that position has been
requested, but all of the driver controllable conditions
have not been met. This is in an attempt to notify
the driver that the transmission needs to be put into
NEUTRAL, the vehicle speed is too great, or some
other condition outlined (other than a diagnostic fail-
ure that would prevent this shift) above is not met.
Note that this flashing will continue indefinitely
until the conditions are eventually met, or the selec-
Fig. 77 Selector Switch
1 - TRANSFER CASE MODE SELECTOR SWITCH
21 - 564
TRANSFER CASE - NV233
AN
tor switch position is changed, or if diagnostic rou-
tines no longer allow the requested shift.
• If the driver attempts to make a shift into trans-
fer case NEUTRAL, and any of the driver controlla-
ble conditions are not met, the request will be
ignored until all of the conditions are met or until
the NEUTRAL select button is released. Additionally
the neutral lamp will flash, or begin to flash while
the button is depressed and operator controllable
conditions are not being met. All of the LED’s except
the Neutral will flash if any of the operator control-
lable conditions for shifting are not met while the
Neutral button is depressed. This
9toggle9 type of fea-
ture is necessary because the TCCM would interpret
another request immediately after the shift into
transfer case NEUTRAL has completed.
• No LED’s illuminated indicate a fault in the
transfer case control system.
SHIFT MOTOR
DESCRIPTION
The shift motor (Fig. 78) consists of a permanent
magnet D.C. motor with gear reduction to convert a
high speed-low torque device into a low speed-high
torque device. The output of the device is coupled to
a shaft which internally moves the mode and range
forks that change the transfer case operating ranges.
The motor is rated at 25 amps maximum at 72° F
with 10 volts at the motor leads.
OPERATION
The transfer case shift motor responds to the
Transfer Case Control Module (TCCM) commands to
move the transfer case shift sector bi-directionally, as
required, to obtain the transfer case operating mode
indicated by the instrument panel mounted selector
switch.
REMOVAL
(1) Raise the vehicle on a suitable hoist.
(2) Remove the front propeller shaft. (Refer to 3 -
DIFFERENTIAL
&
DRIVELINE/PROPELLER
SHAFT/PROPELLER SHAFT - REMOVAL)
(3) Disengage the wiring connectors from the shift
motor and mode sensor.
(4) Remove the front output shaft companion
flange from the transfer case.
(5) Remove the bolts (Fig. 79) holding the shift
motor and mode sensor assembly onto the transfer
case.
(6) Separate the shift motor and mode sensor
assembly from the transfer case.
Fig. 78 Shift Motor - Shown Inverted
1 - TRANSFER CASE SHIFT MOTOR
Fig. 79 Remove the Shift Motor and Mode Sensor
Assembly Bolts
1 - TRANSFER CASE
2 - SHIFT MOTOR AND MODE SENSOR ASSEMBLY
3 - BOLT
AN
TRANSFER CASE - NV233
21 - 565
SELECTOR SWITCH (Continued)
INSTALLATION
(1) Verify that the shift sector o-ring is clean and
properly positioned over the shift sector and against
the transfer case.
(2) Position the shift motor and mode sensor
assembly onto the transfer case.
(3) Install the bolts (Fig. 80) to hold the assembly
onto the transfer case. Tighten the bolts to 16-24
N·m (12-18 ft.lbs.).
CAUTION: If the original shift motor and mode sen-
sor assembly bolts are reused, be sure to use
Mopar
T
Lock & Seal or Loctite™ 242 to replenish
the lock patch material originally found on the bolts
(4) Engage the wiring connectors to the shift motor
and mode sensor.
(5) Install the transfer case front output shaft
companion flange onto the transfer case. Tighten the
flange nut to 122-176 N·m (90-130 ft.lbs.).
(6) Install the front propeller shaft. (Refer to 3 -
DIFFERENTIAL
&
DRIVELINE/PROPELLER
SHAFT/PROPELLER SHAFT - INSTALLATION)
(7) Refill the transfer case as necessary.
(8) Lower vehicle and verify transfer case opera-
tion.
Fig. 80 Install the Shift Motor and Mode Sensor
Assembly Bolts
1 - TRANSFER CASE
2 - SHIFT MOTOR AND MODE SENSOR ASSEMBLY
3 - BOLT
21 - 566
TRANSFER CASE - NV233
AN
SHIFT MOTOR (Continued)
TRANSFER CASE - NV244
TABLE OF CONTENTS
page
page
TRANSFER CASE - NV244
TRANSFER CASE - NV244. . . . . . . . . . . . . . . 568
FLUID
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . 595
FLUID DRAIN AND REFILL . . . . . . . . . . . . . . . 595
FRONT OUTPUT SHAFT SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 596
MODE SENSOR
REAR RETAINER BUSHING AND SEAL
SELECTOR SWITCH
SHIFT MOTOR
TRANSFER CASE - NV244
DESCRIPTION
The NV244 is an electronically controlled full and
part-time transfer case with no two wheel drive oper-
ation.
A differential in the transfer case is used to control
torque transfer to the front and rear axles. A low
range gear reduction system provides increased low
speed torque capability for off road operation. The
low range provides a 2.72:1 reduction ratio.
The geartrain is mounted in two aluminum case
halves attached with bolts. The mainshaft front and
rear bearings are mounted in aluminum retainer
housings bolted to the case halves.
OPERATING RANGES
NV244 operating ranges are:
• AWD(All-Wheel Drive)
• 4HI (Part-time)
• 4LO
• NEUTRAL
The AWD mode can be used at any time and on
any road surface.
The 4HI (Part-time) and 4LO ranges are for off
road use only. The only time these ranges can be
used is when the road surface is covered with snow,
ice, or other loose slippery material.
SHIFT MECHANISM
Operating
ranges
are
selected
with
a
dash
mounted shift selector switch. The shift selector
switch provides a input to the Transfer Case Control
Module (TCCM) to indicate the driver’s desire to
change operating ranges. The TCCM uses this input,
along with the input from the transfer case mounted
mode sensor and information from the vehicle’s bus,
to determine if a shift is permitted. If the TCCM
decides the shift is permitted, the TCCM controls the
shift motor, mounted to the exterior of the transfer
case, to perform the shift.
AN
TRANSFER CASE - NV244
21 - 567
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