2013 SSANGYONG KORANDO clutch

2) Transaxle Cooling
The transaxle cooling system ensures rapid warm-up and constant operating temperature resulting in
reduced fuel consumption and refined shift quality.
It also includes a cooler by-pass within the hydraulic system to allow sufficient lubrication to the transaxle
drivetrain in the event of a blockage in the transaxle cooler.
3) Shift Strategy
Gear Change
Transaxle gear change is controlled by the
TCU. The TCU receives inputs from various
engine and vehicle sensors to select shift
schedules and to control the shift feel and
torque converter clutch (TCC) operation at each
gear change.
Coast down
Coast down down shifts occur at 0% pedal
when the vehicle is coasting down to a stop.
Torque Demand
Torque demand down shifts occur
(automatically) when the driver demand for
torque is greater than the engine can provide at
that gear ratio. If applied, the transaxle will
disengage the TCC to provide added
acceleration.

3680-01
4. LIMP HOME MODE
When the transaxle is defective
In the event of a system fault, the TCU also provides for failure mode effect control (FMEC) to maintain
maximum functional operation of the transaxle.
In the event of a total loss of control or electrical power, the basic transaxle functions (Park, Reverse,
Neutral and Drive) are retained. The 4th and reverse gear ratios with the torque converter clutch in the
unlocked state are the retained gear states the hydraulic system supports without any electrical
assistance.
The TCU communicates with other vehicle electronic control modules by the controller area network
(CAN). If a major fault develops, the transaxle may automatically operate in a "limp home" (failure)
mode to enable the vehicle to be driven to an authorized dealer for repair.
The TCU also provides for transaxle diagnostics, which meet the requirements of OBD II legislation,
monitoring all components which may effect vehicle emissions. 1.
2.
3.
4.
When the transaxle overheats
Limp home mode may also be engaged if the battery charge falls below 8V.
If the transaxle overheats, the shift patterns will automatically change to enable improved transaxle
cooling.
During transaxle overheat, the instrument cluster transaxle selector position display and the over
cluster until normal transaxle operating temperature is reached. 1.
2.
3.
Towing the automatic transaxle equipped vehicle
Flat-bed equipment is the best method of moving a disabled vehicle to avoid any damages.
For AWD vehicle: The vehicle must be towed with a wheel lift and dollies or flatbed equipment with
all the wheels off the ground.
For 2WD vehicles: It is acceptable to tow the vehicle with the rear wheels on the ground without
dollies and the front wheels off the ground. When being towed by a commercial towtruck and wheel
dollies are not available, the front of the vehicle should be lifted, not the rear. -
-

5. TRANSAXLE ELECTRONIC CONTROL SYSTEM
1) General Information
The transmission control unit (TCU) and its input/output network control the following transmission
operations:
Shift timing
Line pressure
Clutch pressure (shift feel)
Torque converter clutch -
-
-
-
also uses these signals when determining transaxle operating strategy. Using all of these input signals,
the TCU can determine when the time and conditions are right for a shift, or when to apply or release the
torque converter clutch. It will also determine the pressure needed to optimise shift feel. To accomplish
this, the TCU operates six variable bleed control solenoids and four on/off solenoids to control transaxle
operation.
2) TCU (Transmission Control Unit)
The transaxle control unit (TCU) is mounted
under the driver's seat and controls the operation
of the transaxle.
The TCU is activated and deactivated by the
ignition power supply and is connected to the
transaxle link harness by a 26 pin connector. The
TCU processes information received from internal
sensors and signals received across the CAN
bus in analogue and digital forms such as:
Transaxle input speed
Transaxle output speed
Accelerator pedal position
Gear selector position
Engine torque
Engine speed
Transaxle fluid temperature
Brake pedal status
Engine oil temperature
Engine coolant temperature
Ambient air temperature
Barometric pressure -
-
-
-
-
-
-
-
-
-
-
-

3680-01
This information is used by the TCU to decide which shift pattern to select and for shift energy
management. Electro-hydraulic solenoid valves and variable bleed solenoids control the transaxle gear
changes.
Six variable bleed solenoids and four on/off solenoids are used to direct transaxle fluid flow to control the
fluid pressure within the three clutches and two bands. Separate pressure regulators are used
exclusively for torque converter clutch control and main transaxle line pressure.
The TCU monitors all TCU inputs and outputs to confirm correct system operation. If a fault occurs the
TCU is able to perform default action and inform the driver of the problem through the instrument cluster
warning lights. Detailed information is available via trouble codes which can be read with the service tool.

7. POWER TRANSFER
Power transfer modes are as follow:
Manual: 1st gear (position M)
Drive: 1st gear
Drive: 2nd gear
Drive: 3rd gear
Drive: 4th gear - limp home mode
Drive: 5th gear
Drive: 6th gear -
-
-
-
-
-
-
1) Gear Selection and Engagement Element
Gear Gear ratioEngagement element (clutch/band)
C1 C2 C3 B1 B2 1-2 OWC
M1 4.156 ON ON
1st 4.156 ON ON
2nd 2.375 ON ON
3rd 1.522 ON ON
4th 1.144 ON ON
5th 0.859 ON ON
6th 0.676 ON ON
Reverse 3.178 ON ON
GearON/OFF solenoid valve Variable bleed solenoid valve (VBS)
S1 S2 S3 S4 S5(A) S6(A) S7(A) S8(A) S9(A) S10(A)
M1ON 101
1st ON 1 0 0-1
2nd ON ON 1 0 1 0-1
3rdON ON 101 0-1
4th 0 0 0-1
5th ON 011 0-1
6th ON ON 0 1 1 0-1
Rev. ON ON ON 1 1 1 0-1

3680-01
2) Power Flowing Sequence
Torque converter Input shaft Front planetary gear
C2 clutch Forwarding sun gear Rear planetary gear
C1 clutch Center support Intermediate shaft
assembly
inal reduction and
differential gearThis is a fluid clutch.
Transfers the power from
engine to transaxle and
amplifies the torque.Transfers the power
from torque converter
to front planetary
gear.Generates the gear
ratio and transfers the
power.
Engaged by hydraulic
pressure and transfers the
power to C1 clutch.Transfers the power from
torque converter to rear
planetary gear.Generates the gear ratio
and transfers the power.
Engaged by hydraulic
pressure and transfers the
power to C1 clutch.Transfers the power from
input shaft to intermediate
shaft.Changes the rotating direction
and generates the final
reduction rear ratio.
Generates the final reduction gear ratio and performs
the differential function.
Transfers the power to constant velocity shaft.

3660-01
1. ABBREVIATION
No Abbreviation Name
1 DTC Diagnostic trouble code
2 TCU Transmission control unit
3 ATF Automatic transmission fluid
4 DC Damper clutch
5 PCSV Pressure control solenoid valve
6 UD Under drive
7OD Over drive
8 LR Low reverse
9 LP Line pressure
10 SOL Solenoid
11 VFS Variable force solenoid
12 PG-A Input speed sensor
13 PG-B Output speed sensor

2. GENERAL INFORMATION
Automatic transaxle (6F24)
The Model 6F24 six speed automatic transaxle is
available in two variants: four wheel drive and two
wheel drive.
Six forward speeds
One reverse gear
A toruqe converter with an integral converter lock-
up clutch with slip control capabilities
Planetary gear-set (3EA)
Clutches (2EA)
Brake (3EA)
O.W.C (1EA)
All hydraulic functions are directed by electronic
solenoids to control: -
-
-
-
-
-
-
-
Engagement feel
Shift feel
Shift scheduling
Modulated torque converter clutch
applications 1)
2)
3)
4) Inhibitor switch
Oil pan
Torque converter
TCU (located under driver's seat)
TCU is located under the driver's seat and controls
the transaxle operations.
TCU receives and uses the signals from sensors
and switches through CAN bus with analog and
digital types.
E-coupling unit
TCU