SSANGYONG KYRON 2010.01 Manual page 567

When the VPS is at standby, that is no gearshift is taking place, the VPS current is set to 200
mA giving maximum output pressure.
Under steady state conditions the band and clutch regulator valve solenoids are switched OFF.
This applies full Line 500 pressure to the plunger and because Line 500 pressure is always
greater than S5 pressure it squeezes the S5 oil out between the regulator valve and the
plunger. The friction elements are then fed oil pressure equal to Line 500 multiplied by the
amplification ratio.
When a shift is initiated the required ON/OFF solenoid is switched ON cutting the supply of Line
500 to the plunger.
At the same time the VPS pressure is reduced to the ramp start value and assumes control of
the regulator valve by pushing the plunger away from the valve. The VPS then carries out the
required pressure ramp and the timed shift is completed by switching OFF the ON/ OFF
solenoid and returning the VPS to the standby pressure.
This system enables either the band or clutch or both to be electrically controlled for each
gearshift.
▶ Mode indicator light
Depending on the application, the mode indicator light may be used to indicate the mode that
has been selected or if an overheat condition exists. The mode indicator light is usually located
on the instrument cluster.
9) Communication Systems
(1) CAN
The Controller Area Network (CAN) connects various control modules by using a twisted pair of
wires, to share common information. This results in a reduction of sensors and wiring. TCU
obtains the actual engine speed and throttle position, vehicle speed and accelerator position
etc. from ECM via CAN without any additional sensors.
(2) K-Line
The K-line is typically used for obtaining diagnostic information from the TCU. A scan tool with
a special interface is connected to the TCU via Data Link Connector (DLC) and all current
faults, stored faults, runtime parameters are then available. The stored trouble codes can also
be cleared by scan tool.
The K-line can be used for vehicle coding at the manufacturer's plant or in the workshop. This
allows for one TCU design to be used over different vehicle mod-els.
The particular code is sent to the microprocessor via the K-line and this results in the software
selecting the correct shift and VPS ramp parameters.
01-19
3410-01
ION 4-SPEED
KYRON 2010.01