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Dodge Ram Truck 1500-2500-3500. Manual - part 1883
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.
The LED’s in the selector assembly are illuminated/flashed in the following manner to indicate a particular condition
or state.
•
A solidly illuminated LED indicates a successfully completed shift and the current operating mode of the trans-
fer case. While a shift has been requested but not yet completed, the LED for the desired transfer case posi-
tion is flashed.
•
A flashing operating mode LED for the desired gear indicates that a shift to that position has been requested,
but all of the driver controllable conditions have not been met. This is in an attempt to notify the driver that the
transmission needs to be put into NEUTRAL, the vehicle speed is too great, or some other condition outlined
(other than a diagnostic failure that would prevent this shift) elsewhere (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/TRANSFER CASE CONTROL MODULE - OPERATION) is not met. Note that
this flashing will continue indefinitely until the conditions are eventually met, or the selector switch position is
changed, or if diagnostic routines no longer allow the requested shift.
•
If the driver attempts to make a shift into transfer case NEUTRAL, and any of the driver controllable conditions
are not met, the request will be ignored until all of the conditions are met or until the NEUTRAL select button
is released. Additionally the neutral lamp will flash, or begin to flash while the button is depressed and operator
controllable conditions are not being met. All of the LED’s except the Neutral will flash if any of the operator
controllable conditions for shifting are not met while the Neutral button is depressed. This
9
toggle
9
type of fea-
ture is necessary because the TCCM would interpret another request immediately after the shift into transfer
case NEUTRAL has completed.
•
No LED’s illuminated indicate a fault in the transfer case control system.
ASSEMBLY-SHIFT MOTOR/MODE SENSOR
DESCRIPTION
The shift motor (1) consists of a permanent magnet
D.C. motor with gear reduction to convert a high
speed-low torque device into a low speed-high torque
device. The output of the device is coupled to a shaft
which internally moves the mode and range forks that
change the transfer case operating ranges. The motor
is rated at 25 amps maximum at 72° F with 10 volts at
the motor leads.
OPERATION
The transfer case shift motor responds to the Transfer Case Control Module (TCCM) commands to move the trans-
fer case shift sector bi-directionally, as required, to obtain the transfer case operating mode indicated by the instru-
ment panel mounted selector switch.
21 - 1464
TRANSFER CASE - NV243 - SERVICE INFORMATION
DR/DH