RAM 2500 Truck 4WD L6-6.7L DSL Turbo VIN A (2007)
Four Wheel Drive Selector Switch: Description and Operation
NV244 GENII Transfer Case
Description
DESCRIPTION
The selector switch assembly is mounted in the left side of the vehicle's 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 light emitting diode's (LED's) to indicate the transfer case position and whether a shift is in progress.
Operation
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:
For resistances between the ranges B-E shown for each valid position (T-Case NEUTRAL, 4LO, 4HI, 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 and in-between positions, the TCCM may interpret the resistance as:
-
the AWD 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 NEUTRAL, the TCCM may interpret the resistance as:
-
the T-Case NEUTRAL position.
-
an invalid fault position.
