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3) CIRCUIT DESCRIPTION
(1) OVERVIEW
By using the planetary gear sets, two-gears shift type part time transfer case achieves direct
connection when selecting 4WD "HIGH"
selecting 4WD "LOW". The silent chain in transfer case transfers the output power to
front wheels.
The simple operation of switches on instrument panel allows to shift between "2H"
"4H" easily while driving (for 4L: stop vehicle first). The warning lamp warns the driver
when the system is defective.
The 4WD system integrated in KYRON does not have big difference in comparison to the
conventional part time transfer case, but the changes in comparison to the conventional
transfer case are as follows
-
No additional coding is required when replacing TCCU.
-
Delete the devices (tone wheel, wiring etc.) related to the speed sensor in the transfer
case.
This system receives the speed signals from ABS/ESP HECU or instrument panel
(for non-ABS vehicle(Note)) through the CAN communication.
-
Delete the pin related to the speed sensor from TCCU pins.
-
Change the transfer case wiring connector from No.4 pin to No.1 pin. (Power and
ground related to the speed sensor)
The new TCCU is available to install on the vehicle with the conventional DI engine
part time TCCU.
-
Instrument panel:
In non-ABS vehicle, the vehicle speed sensor is installed on the
rear drive axle.
The engine ECU sends the speed signal to the instrument panel,
and then the instrument panel provides the information to TCCU
and ther devices.
(2) LOCKING HUB SYSTEM
The transfer case and the TCCU differ from previous models only in the speed sensor related
parts. However, the vacuum locking hub operation system works oppositely from previous
models and its components also have changed.
The vacuum locking hub that is applied to Kyron uses the IWE (Integrated Wheel End)
system, and in this system, the vacuum is generated only within the hub actuator.
It is structured to transmit power to the front section after the actuator hub is engaged
following the release
of vacuum from the drive shaft end gear and the hub end gear.
and 2.48 of reduction gear ratio when
and
(3) TCCU PIN NUMBERS AND DESCRIPTION
0-23
3410-01
CIRCUIT
KYRON 2005.10

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