2012 SSANGYONG NEW ACTYON SPORTS ECU

01-16
4. LIMP HOME MODE
In case of transmission malfunction ▶
If a serious fault occurs in the automatic transmission, the TCU enters the limp home
mode to secure safe driving and protect the automatic transmission.
As power is no longer supplied to the solenoid, the current basic function (P, R, N, D) is
maintained and the 4th gear can be maintained only by the operation of the hydraulic
system without electrical operation.
The ECU communicates with other electric modules with CAN. If a serious fault occurs, the
transmission automatically enters the limp home mode for service.
The TCU monitors all factors which can affect to the performance of the transmission and
diagnose the system according to OBD II regulation. 1.
2.
3.
4.
In case of overheated transmission ▶
The TCU enters the limp home mode when the batter voltage drops below 8 V.
If the transmission is overheated, the shift pattern is changed to the hot mode to cool the
transmission more efficiently.
While the transmission is overheated, the selector lever symbol and engine temperature
warning lamp on the instrument cluster blink until the transmission is cooled down to the
normal operation temperature. If the transmission is excessively overheated, the gear
cannot be shifted but remains in the neutral position. 1.
2.
3.
Towing the vehicle with A/T ▶
The best way to transport the vehicle is to load it to a truck and transport it, especially if the
vehicle is 4WD.
If towing the vehicle with the propeller shaft connected, the transmission or oil pump of
transfer case may malfunction, resulting in internal damage due to poor lubrication. -

01-18
(2) CAN Input/Output
TCU receives and sends the data among the units through P-CAN communication.
CAN Input/Output Data between Engine ECU and TCU ▶

01-213680-01
Pressure Modulation ▶
To provide a higher level of shift comfort and durability, the hydraulic pressure in the shift related
friction elements of the transmission must be matched accurately to the input torque to
transmission. This hydraulic pressure is composed of a hydraulically pre-set basic pressure and a
control pressure which is set by one of the variable bleed solenoids.
The transmission input torque can be directly calculated from the following operating parameters:
engine torque signals
engine speed or any signal transmitted from ECU through CAN lines
converter slip -
-
-
Separate pressure characteristics for each gear change make it possible to adapt precisely to the
particular shift operation.
5) Shift Mode Selection by TCU
The driver can select Standard (S) or Winter mode (W) with the mode switch. TCU automatically
changes the shift mode according to the transmission oil temperature, uphill or downhill gradient,
and altitude to keep the good driving conditions.
Standard Mode (S) ▶
Uphii and Downhill Mode ▶
Altitude Mode ▶ Standard Mode is selected when setting the mode switch in Standard (S) position with the gear
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990088009b009c0099008c0047009000950047009500960099>mal operating range. Proper shift
timing provides the optimized fuel economy and good driving conditions.
In this mode, the operating points of torque converter lock-up clutch and the shifting points are
adjusted according to the vehicle weight.
In this mode, the shifting points are automatically adjusted according to the altitude to compensate
the engine torque changes due to barometric pressure and temperature.

01-22
Winter Mode (W) ▶
Low Range Driving Mode ▶
Warm Up Mode ▶ When the Winter mode is selected, the second gear is engaged to start off the vehicle easily to
prevent wheel spin on slippery surfaces and WINTER mode indicator comes ON. The first gear is
not available in this mode.
When the vehicle is in 4L driving mode, the transmission uses a different shift mode to optimize
the low range driving. Similar to Winter mode, the first gear is not available.
This mode is normally used when the transmission oil temperature is below 20°C.
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6a0047009b00960047009700990096009d0090008b008c0047>the warming up process of
transmission.
Hot Mode ▶
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b6006a004700880095008b00470058005b005c00b6006a0053> the system provides the cooling
and reduces the load to the transmission. This is called Hot Mode.
Above 110°C:
Above 130°C:
Above 145°C: -
-
-
In Hot Mode, any of shift mode is not available.
Cruise Control ▶
When the cruise control is activated, the engine ECU requests the downshift to increase the
engine brake effect.PWM fan ON
the engine torque is reduced and WINTER indicator is blinking
the transmission is held in Neutral (N) gear until the oil temperature falls
below 120°C (Final protection)

03-73170-01
2) Function of N Switch
(1) Aids a smooth start of the vehicle by raising the RPM during the gear
shifting when the engine is cold.
When the vehicle is trying to start from the stopped state (vehicle speed below 3 km/h), the N
switch determines the shifting timing by using the clutch switch and the N switch. It raises the
engine RPM (100 ~ 200 rpm). Operation conditions are as follows.
The vehicle speed is at the stopped state (Vehicle speed below 3km/h detection).
While depressing the clutch (Clutch switch detection).
The gear lever is at a position other than neutral (N switch detection).
Start the vehicle while depressing the clutch pedal (Clutch switch detection).
The RPM increases in accordance with the temperature of the engine coolant
(Engine coolant temperature sensor detection). -
-
-
-
-
appx. 100 rpm increase
appx. 100 ~ 170 rpm increase
<008800970097009f00550047005f005700b6006a0047004f0095009600990094008800930047009b008c00940097008c00990088009b009c0099008c00470096008d0047009b008f008c0047008c0095008e00900095008c0047008a009600960093008800
95009b005000610047008800990096009c0095008b00470059>00 rpm ·
·
·
When the gear has been smoothly shifted and the vehicle speed exceeds 3km/h, it returns to
the previous operation interval of the engine RPM. -
In case of Actyon, the N switch signal is transmitted to the instrument panel, and then the
instrument panel transmits it to the engine ECU through the CAN communication.
Vehicle Made After 04.09.15 Actyon

03-8
Variant Coding Options
(2) Detects the position of the shifting lever for the HDC operation
among ABS functions.
The HDC function operates only if the M/T shift lever is in forward or reverse position. Please refer
to the ABS section for the specific information related to the HDC.
Variant Coding Related to N Switch ▶
The N switch transmits information to the ECU through the CAN communication while New Rexton
is connected to the ECU through wires. Thus, if you set the variant coding in the engine ECU, you
must do it differently, and you must set the variant coding differently according to the vehicle
category and specification as below.
Neutral Signal Input None / Wire / CANWire /
Actyon & Kyron models with
manual transmission
New Rexton model with manual
transmission Manufactured
after 04.09.15
BODY IN: after 154600
Automatic transmission & Rodius
model with automatic
transmission before 2006

09-54850-01
3) Parts Arrangement
Part nameVehicle with CBSVehicle with ABS/EBDVehicle with ESP
HECU
Not appliedAppliedApplied Front wheel speed sensor
Rear wheel speed sensor
ABS warning lamp
EBD indicator
Longitudinal G sensor 2WD: N/A, 4WD: Applied Not applied
Sensor cluster
(Yaw rate sensor,
lateral/longitudinal G sensor)
Not applied Applied
ESP indicator
ESP OFF switch and warning
lamp
Steering wheel angle sensor
4) Components
ABS ESP+ARP
2WD 4WD 2WD 4WD
Whhel speed sensor 4 4 4 4
Sensor cluster N/A N/A Applied Applied
G-sensor N/A Applied N/A N/A
2H G-sensor - Operating - -
4H G-sensor - Operating - -
4L G-sensor - Operating - -
2H sensor cluster - - Operating Operating
4H sensor cluster - - Operating Operating
4L sensor cluster - - Operating Operating

09-28
Front Brake AssemblyFront Wheel Speed Sensor (4WD)
HECU
2. SYSTEM LAYOUT
Master Cylinder and Booster
Brake Pedal