clutch SSANGYONG KORANDO 2012 Owner's Manual

02-14
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 -
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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 -
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02-153680-01
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.

02-18
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 -
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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
3rd ON ON 1 0 1 0-1
4th 0 0 0-1
5th ON 0 1 1 0-1
6th ON ON 0 1 1 0-1
Rev. ON ON ON 1 1 1 0-1

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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.

03-33660-01
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

03-4
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: -
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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. Driver seat
TCU
Passenger
seat

03-6
3. SPECIFICATIONS
1) Specifications
Type/Weight 6F24 6-speed automatic transaxle /
approx. 86 kg (including ATF)
TORQUE 230 Nm
Overall length / Center length 373.1 mm / 204 mm
Descriptions Specification
Gear ratio 1st gear 4.212
2nd gear 2.637
3rd gear 1.800
4th gear 1.386
5th gear 1.000
6th gear 0.772
Reverse gear 3.385
Shift pattern Variable
Shift range 4 Range (P-R-N-D) + Manual mode
Shift range valve VFS : 6EA
Planetary gear 3EA (Front, Middle, Rear)
Clutch 2EA
Brake 3EA
O.W.C 1EA
Oil Type ATF SP-IV or SP-IV M
Capacity approx. 7.1 L
Change interval Maintenance free. However, under the severe
conditions or commercially used, change the oil at
every 100,000 km (EU: 90,000 km).
Resistance of oil
temperature sensor-20Approx 15.6kΩ
0Approx 5.88kΩ
20Approx 2.51kΩ
100Approx 0.18kΩ
Weight 2WD 87.5kg
4WD 88.5kg

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4. COMPONENTS
HPT 6A/T (6F24)
One-way clutchTorque converter
(with slip lockup)
Oil pumpHarness
Valve bodySide gearDriven gear

03-10
6. SPECIAL SERVICE TOLLS
Part number Name Tool How to use
00104-001(UD) Remover &
Installer - U/D
brake return sprin
00104-002(OD) Remover&
Installer - O/D
clutch return
spring
00104-003(LR)
(use with 00104-001)Remover&
Installer - L/R
brake return
spring
* Special service tool Supplier: Tool & Tech

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1. OVERVIEW
2WD4WD
The Model 6F24 6 speed automatic transaxle is electronically controlled. The control system is
comprised of the following components:
External transaxle control unit (TCU)
Input and output speed sensors
Six variable force solenoids(VFS) and two on/off solenoids
Torque converter
ATF temperature sensor -
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TCU controls the oil pressure for various internal clutches and brakes to select the gear. It also controls
the electronic elements, shift pressure and torque converter slip. If the system is defective, TCU provides
FMEC (Failure Mode Effect Control) to maintain the functionality of transaxle. This keeps the basic
function of transaxle (gear selection) even when there are failure in controls and power supply.
There are selector shaft position sensor (inhibitor switch) and oil temperature sensor in transaxle. In
manual mode, TCU receives the information from TGS (Transmission Gear Selector) through PCB
(Printed Circuit Board) when driver selects the manual shift mode. TCU communicates with other electric
control modules through CAN. In order to ensure a safe driving state and to prevent damage to the
automatic transmission, TCU switches to Limp-Home mode in the event of critical faults.