Shift Motor Control
WARNING: This page is about a different car, the 2011 RAM Dakota. However, it is still accessible from the selected car via links, so may be relevant.
The FCM will have the ability to vary the speed of the transfer case motor through pulse width modulation (PWM). It is PWM from 0 to 100% at 100Hz.
The PWM will function as follows:
- Apply an initial duty cycle (APPROXIMATELY 94%) to shift motor control wires.
- Control the acceleration of the shift motor by increasing the applied duty cycle at a specified rate.
- Control the deceleration of the shift motor by updating the applied duty cycle to the shift motor control wires at a specified rate based upon the difference between the desired position and the current position.