ASSEMBLY-SHIFT MOTOR/MODE SENSOR
DESCRIPTION
The shift motor (3) is an electromechanical device
consisting of a DC permanent magnet motor, a gear
train, and an analog position sensor. The shift motors’
overall function is to move and lock a gear that moves
the range fork and clutch lever found in the transfer
case. This allows the transfer case to be shifted elec-
trically to multiple operating positions (4LOW and
AWD). The operating current of the shift motor under
stall conditions is 30 amps maximum at 72° F with
13.5 volts, at the motor leads.
OPERATION
Shifting in the transfer case occurs when a Pulse Width Modulated (PWM) voltage is supplied to the shift motor by
the Final Drive Control Module (FDCM). A linear analog position sensor located inside the shift motor, provides the
FDCM with the motors’ angular, rotational position. With this information, the FDCM continuously knows the motors’
position, and therefore allows it to accurately control the motors’ operation, including voltage polarity which is used
to control motor direction.
REMOVAL
NOTE: New shift motor assemblies are shipped in the AWD position. If a new shift motor assembly must be
installed, it will be necessary to shift the transfer case to the AWD position prior to motor installation.
1. Raise the vehicle on a suitable hoist.
2. Disengage the wiring connector from the shift
motor and mode sensor assembly.
3. Remove the bolts (1) holding the shift motor and
mode sensor assembly (2) onto the transfer case.
21 - 1058
TRANSFER CASE - NV245 - SERVICE INFORMATION
WK