Dakota 4WD V8-4.7L Flex Fuel (2008)
depressed.
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4LO to NEUTRAL - Successful shifts have no lamps illuminated, then after the NEUTRAL position has been met, display the NEUTRAL LED
solid. In the blocked condition, no lamps are illuminated during the 5 Phase 1 attempts. After 5 unsuccessful attempts, the transfer case remains in
4LO and the 4LO lamp is illuminated. When shift conditions are not met, flash the NEUTRAL lamp while the push button is depressed.
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NEUTRAL to 2WD or AWD - Successful shifts have no lamps illuminated, then after the 2WD or AWD position has been met, no lamps are
illuminated. In the blocked condition, no lamps are illuminated during the 5 Phase 1 attempts. After 5 unsuccessful attempts, Phase 2 shifting will
continue until the transfer case is in the 2WD or AWD or 4LO position. If the final position is 2WD or AWD, no lamp is illuminated, if the final
position is 4LO, illuminate the 4LO lamp. When shift conditions are not met, flash the 4LOCK and 4LO lamps and the NEUTRAL LED remains
solid while the push button is depressed,
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Neutral to 4LOCK - Successful shifts will flash the 4LOCK lamp during a shift, then after the 4LOCK position has been met, display the 4LOCK
lamp solid. In a blocked condition, the 4LOCK lamp will flash during the 5 Phase 1 attempts. After 5 unsuccessful attempts, continue to flash the
4LOCK, Phase 2 shifting will continue until the transfer case is in the 2WD or AWD or 4LO position. If the final position is 2WD or AWD, turn
off the 4LOCK lamp, if the final position is 4LO, illuminate the 4LO lamp. When shift conditions are not met, flash the 4LOCK and 4LO lamps
and the NEUTRAL LED remains solid while the push button is depressed.
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NEUTRAL to 4LO - Successful shifts will flash the 4LO lamp during a shift, then after the 4LOCK position has been met, display the 4LO lamp
solid. In a blocked condition, the 4LO lamp will flash during the 5 Phase 1 attempts. After 5 unsuccessful attempts, continue to flash 4LO, Phase 2
shifting will continue until transfer case is in the 2WD or AWD or 4LO position. If the final position is 2WD or AWD, turn off the 4LO lamp, if
the final position is 4LO, illuminate the 4LO lamp solid. When shift conditions are not met, flash the 4LOCK and 4LO lamps and the NEUTRAL
LED remains solid while push the button is depressed.
SHIFT SEQUENCES (PHASE 1 SHIFTS)
Once all the driver controllable conditions for the requested shift have been met, the FCM begins a shift timer with a maximum duration of 1 second per
mode sensor target segment. If the shift timer expires before the FCM recognizes to correct mode sensor position, the shift is considered to have been
blocked. The blocked shift will increment the blocked shift counter by one. The FCM strategy for handling blocked shifts will be described later. The
process the FCM performs for the various shifts will be described first.
RANGE AND MODE SHIFTS
The process for performing all the range and mode shifts are the same. The following steps describe the process.
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Allow time for Selector Switch debounce; 250 msec ±50 msec.
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Activate/deactivate the 4WD system message icons in the instrument cluster as necessary.
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Engage the shift motor for a maximum of 1 second ±100 msec per mode sensor target segment in the destination gear's direction while monitoring
the mode sensor.
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Disengage the shift motor when the correct mode sensor position is recognized.
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Solidly illuminate the achieved position's instrument panel icon, unless the target is 2WD or AWD.
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Transmit a bus message that the transfer case shift is complete.
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If the desired mode sensor position is not reached after the shift timer expires (i.e.: a blocked shift motor or other condition exists), the FCM will
stop driving the motor and wait for 200 msec ±50 msec. The shift motor is then reversed in the direction back toward the source gear for up to 1.0
seconds ±100 msec. per mode sensor target segment. The FCM waits for 2.0 seconds ±50 msec. and repeats the attempt to shift to the desired
position.
The exception to the preceding sequence is when a shift from 4LO to 2WD or AWD is requested. If 2WD or AWD is requested from the 4LO position,
the transfer case is first driven to the 4LOCK position. If the 4LOCK position is reached, the transfer case is then driven back to the 2WD or AWD
position and the shift is considered complete.
SHIFT OUT OF NEUTRAL
The following steps describe the process for a shift out of NEUTRAL.
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Extinguish the Neutral LED.
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Engage the shift motor for a maximum of 1 second ±100 msec toward the transfer case 4LOCK mode position while monitoring the mode sensor
position.
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Disengage the shift motor when the correct mode sensor position is recognized.
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Extinguish the Neutral LED.
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Transmit a bus message that the transfer case shift is complete.
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If the desired mode sensor position is not received after the shift timer expires (i.e. a blocked or other condition exists), stop driving the motor and
wait for 200 msec ±50 msec. The shift motor is then reversed in the direction back toward the source gear for up to 1.0 seconds 100 msec. The
FCM waits for 2.0 seconds ±50 msec. and repeats the attempt to shift to the desired position.
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When the Neutral button is released, if the 4LOCK position is the desired position, the shift is complete. Illuminate the 4LOCK message icon.
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Otherwise when the Neutral button is released, if all of the shift requirements are being met then engage the shift motor towards the desired
position for 1 second ±100 msec per 'D' channel. (if requirements for shifting are not met, illuminate the 4LOCK message icon and flash the
destination message icon as an indication to the driver that all of the driver controllable shift conditions are not being met). If this requires another
range or mode shift, begin the range/mode shift process.
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If the desired mode sensor position is not achieved after the shift timer expires (i.e. a blocked or other condition exists), refer to the section on
