Dakota Quad Cab 4WD V6-3.9L VIN X (2001)
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Ignition key switch is in the RUN position.
Range shifts will be allowed only if all of the following conditions are met:
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A change in the Selector Switch state indicating a range shift has been requested.
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Transmission in NEUTRAL signal must be recognized for at least 1.5 seconds ± 100 msec.
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Proper transmit/receive messages are occurring on the PCI bus.
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Clutch signal is recognized for 500 msec ± 50 msec (Clutch pedal depressed if a manual transmission).
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Vehicle speed is less than or equal to 4.8 Kph (3 mph).
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Ignition key switch is in the RUN position.
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A valid mode sensor signal is being sensed by the TCCM.
A shift into transfer case Neutral will be allowed only if all of the following conditions are met:
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The recessed Neutral Selection switch has been depressed continuously for 4.0 seconds ± 100 msec while all shift conditions have been
continuously met.
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Transmission in NEUTRAL signal recognized from the bus.
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Clutch signal is recognized from the bus (Clutch pedal depressed if a manual transmission).
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Proper message transmissions/receptions are occurring on the PCI bus.
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Vehicle speed is less than or equal to 4.8 Kph (3 mph).
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Ignition key switch is in the RUN position, engine OFF.
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Foot Brake is applied.
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A valid mode sensor signal is being sensed by the TCCM.
A shift out of transfer case Neutral will be allowed only if all of the following conditions are met:
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The recessed Neutral Selection switch has been depressed continuously for 1.0 seconds ± 100 msec while all shift conditions have been
continuously met.
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Transmission in NEUTRAL signal recognized from the bus.
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Clutch signal is recognized from the bus (Clutch pedal depressed if a manual transmission).
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Proper message transmissions/receptions are occurring on the PCI bus.
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Vehicle speed is less than or equal to 4.8 Kph (3 mph).
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Ignition key switch is in the RUN position, engine OFF.
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Foot Brake is applied.
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A valid mode sensor signal is being sensed by the TCCM.
Shift Sequences
Once all the driver controllable conditions for the requested shift have been met, the TCCM begins a shift timer with a maximum duration of 1 second
. If the shift timer expires before the TCCM recognizes to correct mode sensor code, the shift is considered to have been blocked. The blocked shift
will increment the blocked shift counter by one. The TCCM strategy for handling blocked shifts will be described later. The process the TCCM
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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Perform diagnostics on the motor that will check for opens/shorts.
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Engage the shift motor for a maximum of 1 second ± 100 msec per 'D' channel transition in the destination gear's direction while monitoring
the mode sensor channel transitions.
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Transmit a bus message that a transfer case shift is in progress.
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Disengage the shift motor when the correct mode sensor code is recognized.
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Solidly illuminate the current transfer case position's LED while extinguishing the source gear's 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 code is not received after the shift timer expires (ie. a blocked or other condition exists), stop driving the motor and
wait for 1.5 sec ± 50 msec. The shift motor is then reversed in the direction back toward the source gear for up to , 0.7 seconds ± 100msec.
The TCCM waits for 1.5 sec ± 50 msec. and repeats the attempt to shift to the desired position.
Shift Out Of Neutral
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Perform diagnostics on the motor that will check for opens/shorts.
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Transmit a bus message that a transfer case shift is in progress.
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Engage the shift motor for a maximum of 1 second ± 100 msec toward the transfer case 4H mode position while monitoring the mode sensor
channel transitions.
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Disengage the shift motor when the correct mode sensor code 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 code is not received after the shift timer expires (ie. a blocked or other condition exists), stop driving the motor and
wait for 1.5 sec ± 100 msec. The shift motor is then reversed in the direction back toward the source gear for up to 0.7 seconds ± 100msec.
The TCCM waits for 1.5 sec ± 50 msec. and repeats the attempt to shift to the desired position.
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When the Neutral button is released, if the 4H position is the desired position, the shift is complete. Illuminate the 4H LED.
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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
