Dodge Dakota 2001, Руководство по обслуживанию

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•
Sleep Mode will be entered, from the Reduced
Power Mode, when no PCI traffic has been sensed for
20 ±1 seconds. If during Sleep Mode the module
detects PCI bus traffic, it will revert to the Reduced
Power mode while monitoring for ignition messages.
It will remain in this state as long as there is traffic
other than run or start messages, and will return to
Sleep mode if the bus goes without traffic for 20 ±1
seconds.
SHIFT REQUIREMENTS
If the TCCM is in full power mode and at function-
ality level zero, it uses the following criteria to deter-
mine if a shift is allowed.
Mode shifts will be allowed regardless of trans-
mission gear or vehicle speed, whenever the following
conditions are met:
•
A change in the Selector switch state indicates
that a mode shift has been requested.
•
A valid mode sensor signal is being sensed by
the TCCM.
•
Proper transmit/receive messages are occurring
on the PCI bus.
•
Ignition key switch is in the RUN position.
Range shifts will be allowed only if all of the fol-
lowing conditions are met:
•
A change in the Selector Switch state indicating
a range shift has been requested.
•
Transmission in NEUTRAL signal must be rec-
ognized for at least 1.5 seconds ±100 msec.
•
Proper transmit/receive messages are occurring
on the PCI bus.
•
Clutch signal is recognized for 500 msec ± 50
msec (Clutch pedal depressed if a manual transmis-
sion).
•
Vehicle speed is less than or equal to 4.8 km/hr
(3 miles per hour).
•
Ignition key switch is in the RUN position.
•
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:
•
The recessed Neutral Selection switch has been
depressed continuously for 4.0 seconds ±100 msec
while all shift conditions have been continuously met.
•
Transmission in NEUTRAL signal recognized
from the bus.
•
Clutch signal is recognized from the bus (Clutch
pedal depressed if a manual transmission).
•
Proper message transmissions/receptions are
occurring on the PCI bus.
•
Vehicle speed is less than or equal to 4.8 km/hr
(3 miles per hour).
•
Ignition key switch is in the RUN position,
engine off.
•
Foot Brake is applied.
•
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:
•
The recessed Neutral Selection switch has been
depressed continuously for 1.0 seconds ±100 msec
while all shift conditions have been continuously met.
•
Transmission in NEUTRAL signal recognized
from the bus.
•
Clutch signal is recognized from the bus (Clutch
pedal depressed if a manual transmission).
•
Proper message transmissions/receptions are
occurring on the PCI bus.
•
Vehicle speed is less than or equal to 4.8 km/hr
(3 miles per hour).
•
Ignition key switch is in the RUN position,
engine off.
•
Foot Brake is applied.
•
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.
•
Allow time for Selector Switch debounce; 250
msec ±50 msec.
•
Perform diagnostics on the motor that will check
for opens/shorts.
•
Engage the shift motor for a maximum of 1 sec-
ond ±100 msec per ’D’ channel transition in the des-
tination gear’s direction while monitoring the mode
sensor channel transitions.
•
Transmit a bus message that a transfer case
shift is in progress.
•
Disengage the shift motor when the correct
mode sensor code is recognized.
•
Solidly illuminate the current transfer case posi-
tion’s LED while extinguishing the source gear’s
LED.
•
Transmit a bus message that the transfer case
shift is complete.
•
If the desired mode sensor code is not received
after the shift timer expires (ie. a blocked or other
8E - 22 ELECTRONIC CONTROL MODULES
AN
TRANSFER CASE CONTROL MODULE (Continued)