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AUTOMATIC TRANSMISSION 5A-3

/library/BOOKS/CAR/SsangYong/Korando/KorandoB5A0.pdf\nAUTOMATIC TRANSMISSION 5A-3
• N - Neutral allows the engine to be started and oper- When NORMAL mode is selected upshifts will occur
ated while driving the vehicle. The inhibitor switch to maximize fuel economy. When POWER mode is se-
allows the engine to be started. There is no power lected, upshifts will occur to give maximum
transferred through the transmission in Neutral. But performance and the POWER mode indicator light is
the final drive is not locked by the parking pawl, so switched ON.
thewheels are free to rotate. When WINTER mode is selected, starting in second
• D - Overdrive range is used for all normal driving gear is facilitated, the WINTER mode indicator light is
conditions. 4th gear (overdrive gear) reduces the switched ON and the POWER mode indicator light is
fuel consumption and the engine noise. Engine switched OFF.
braking is applied with reduced throttle.
Indicator Light
First to second ( ), first to third ( ), second
The indicator light is located on the instrument panel.
to third ( ), second to fourth ( ), third to
fourth ( ), fourth to third ( ), fourth to • Auto shift indicator light comes ON when the ignition
second ( ), third to second ( ), third to switch ON and shows the gear shift control lever
first ( ) and second to first ( ) shifts are position.
all available as a function of vehicle speed, throttle • POWER mode indicator light comes ON when the
position and the time change rate of the throttle POWER mode is selected and when the kickdown
position. switch is depressed.
Downshifts are available for safe passing by • WINTER mode indicator light comes ON when the
depress-ing the accelerator. Lockup clutch may be WINTER mode is selected.
enabled in 3rd and 4th gears depending on vehicle
type. CONTROL SYSTEMS
• - Manual provides three gear ratios (first through BTRA M WD automatic transmission consists of
third) and prevents the transmission from operating two control systems. One is the electronic control
in 4th gear. 3rd gear is used when driving on long system that monitors vehicle parameters and adjusts
hill roads or in heavy city traffic. Downshifts are the transmission performance. Another is the hydraulic
available by depressing the accelerator. control system that implements the commands of the
• - Manual provides two gear ratios (first and electronic control system commands.
second). It is used to provide more power when
climbing hills or engine braking when driving down ELECTRONIC CONTROL SYSTEM
a steep hill or starting off on slippery roads. The electronic control system comprises of sensors, a
• - Manual is used to provide the maximum engine TCM and seven solenoids. The TCM reads the inputs
braking when driving down the severe gradients. and activates the outputs according to values stored
in Read Only Memory (ROM).
The TCM controls the hydraulic control system. This
control is via the hydraulic valve body, which contains
seven electromagnetic solenoids. Six of the seven
solenoids are used to control the line pressure, operate
the shift valves and the torque converter lock-up clutch,
and to turn ON and OFF the two regulator valves that
control the shift feel.
The seventh solenoid is the proportional or Variable
Pressure Solenoid (VPS) which works with the two regu-
lator valves to control shift feel.
Transmission Control Module (TCM)
KAA5A
The TCM is an in-vehicle micro-processor based trans-
mission management system. It is mounted under the
Driving Mode Selector driver’s side front seat in the vehicle cabin.
The driving mode selector consists of a driving mode The TCM contains:
selector switch and indicator light. The driving mode • Processing logic circuits which include a central mi-
selector is located on the center console and allows croprocessor controller and a back-up memory
the driver to select the driving mode. system.
The driving modes available to be selected vary with • Input circuits.
vehicle types. Typically the driver should have the
option to select among NORMAL, POWER and
WINTER modes.
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