Liberty 4WD V6-3.7L (2009)
Transfer Case Actuator: Description and Operation
MP1522 Transfer Case
Shift Motor with Mode Sensor - Description
DESCRIPTION
MP1522 TRANSFER CASE
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 found in the transfer case. This allows the transfer case to be shifted
electrically to multiple operating positions (4WD LOW, 4WD LOCK and 2WD). 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.
Shift Motor with Mode Sensor - Operation
OPERATION
Shifting in the transfer case occurs when a Pulse Width Modulated (PWM) voltage is supplied to the shift motor by the Drivetrain Control Module
(DTCM ). A linear analog position sensor located inside the shift motor, provides the DTCM with the motors' angular, rotational position. With this
information, the DTCM 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.
