Four Wheel Drive (4WD) System

Four Wheel Drive (4WD) System
There are 3 types of 4WD operating systems:
^ All wheel drive (AWD)
^ One-speed torque-on-demand (TOD)
^ Two-speed TOD

All Wheel Drive (AWD)
The AWD system utilizes the following components:
^ Transfer case
^ Differential (internal to the transfer case)

1-Speed Torque-On-Demand (TOD)
The one-speed TOD system utilizes the following components:
^ Transfer case
^ Electromagnetic clutch (internal to the transfer case)
^ 4X4 control module
^ Message center, used to select between AUTO and LOCKED modes.

2-Speed Torque-On-Demand (TOD)
The automatic 4WD system is a 2-speed TOD design that utilizes the following components:
^ Transfer case
^ Electromagnetic clutch (internal to the transfer case)
^ 4X4 control module
^ Mode select switch (MSS), used to select between 4X4 AUTO, 4X4 HIGH and 4X4 LOW modes
^ Transfer case shift motor
^ Encoder assembly (part of the transfer case shift motor)
^ Shift motor sense plate (part of the encoder assembly)