Raider V6-3.7L SOHC (2006)
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
Blocked Shift Strategy, also known as Phase 2 shifts.
NEUTRAL BLOCKED SHIFT STRATEGY (PHASE 2 SHIFTS)
When a shift is commanded out of neutral, the shift motor will be driven towards its destination position, except in the case of shifting out of NEUTRAL
if 4LO was selected (the transfer case will shift to the 4LOCK position first, before proceeding to 4LO). If the shift is blocked on the way to the
destination, the FCM may attempt to drive the motor back to the original position. This process will be allowed to occur 5 times. If the transfer case has
reached a non-NEUTRAL position during the shift re-attempts, the message icon for the achieved gear position is illuminated and the shift attempts are
stopped. To reattempt the desired shift, the selector switch will need to be rotated to the current position until the switch debounce timer expires then a
shift will need to be requested again.
At the end of the 5th blocked attempt, the shift motor is driven towards the last known mode sensor position. If this motor drive allows the transfer case
to reach the 2WD or AWD position, the shift is considered complete and the shift attempts are ended. If the mode sensor is in the NEUTRAL region at
the expiration of the shift timer, the FCM will continue to make the shift attempts according to the blocked shift strategy independent of whether or not
the driver controlled conditions are met.
For shifts from NEUTRAL, if all 5 attempts fail to reach the desired position (which by default is 4LOCK), the motor will be driven to stall in the
direction of 4LOCK or 4LO, depending on the achieved position. Otherwise, the transfer case will be driven in the direction opposite the last attempt
with the desired target being 4LOCK or 4LO.
If the transfer case reaches the 2WD or AWD position when being driven in the 4LOCK direction, then one final 1.0 second drive toward 4LOCK is
attempted. If the transfer case then reaches the 4LOCK position, the shift is considered complete and the 4LOCK message icon is illuminated. If the
transfer case is still the 2WD or AWD position, the shift is considered complete and all message icons are extinguished.
NEUTRAL DRIFT SHIFT STRATEGY (PHASE 3 SHIFTS)
NOTE: If after the 5th blocked shift and reversal attempt, if the transfer case position is in the NEUTRAL or other undesired region, shift attempts will
continue until a non-NEUTRAL or a desired position is reached.
Phase 3 is a series of shifts whose intent is to escape from an undesired position that has been reached outside of a shift. A perceived drift of the transfer
case into a non-target region without the FCM driving the shift motor will initiate a phase III shift. Phase 3 will be initiated by any non-target region with
the exception of a position greater then encoder_4LO_min or less then encoder_4LOCK_max. Whenever these encoder readings have been seen for
defined period of time, Phase III shifting will begin.
The shifts in a given Phase 3 shifting event are always in a single-direction, toward the target region from which the drift occurred. These shifts are
performed without regard to shift conditions. The timing of each shift should follow the outline of the Phase 1 forward attempts, allowing the shift timer
to reach the target. Between each attempt, there is a calibrated delay. After each attempt the shift counter and the Phase 3 max shifts counter will be
updated.
SHIFT REVERSAL TARGETS
If the shift timer expires (1.0 seconds per mode sensor position) and the transfer case has not reached the desired position, all shifts will attempt to return
to their original position with the exceptions of:
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If the intended shift is going to the High rail from Low and can't make it, but it can make the 2WD or AWD position, the motor stops at that
position. The FCM will not attempt to cross back over NEUTRAL if it does not have to. This means that there was a block on the first attempt to
go to 4LOCK and the transfer case has made it through NEUTRAL to a known good position, then the motor will go back only to the 2WD or
AWD position and execute the remainder of the attempts from there.
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For shifts out of NEUTRAL, any time a shift is commanded out of NEUTRAL, the system needs to get out. The FCM should never go to
NEUTRAL unless the driver is commanding it and all required conditions are being met.
