2003 SSANGYONG MUSSO wheel

ANTILOCK BRAKE SYSTEM 4F-7
ABD SYSTEM DESCRIPTION
General: The Automatic Brake Differential Lock (ABD) is a traction system by means of brake intervention only, available in a low speed range (< 60kph). It workes on µ-split roads with sidewise different friction coefficients.
The spinning driven wheel is braked and the drive torque can be transferred to the wheel on the high- µ side.
During ABD active, the ABD information lamp is blinking.The temperature of the brakes is calculated by a mathematical model and ABD is switched passive if the calculated temperature is greater than a threshold value(500 °C).
ABD is permitted again, when the calculated temperature is less than 350 °C.
Control Algorithm: The input signals for the control algorithm are the filteredwheel speed signals from the ABS speed processing. With the speed difference of the driven wheels, the control deviation is calculated. If the control deviation exceeds a certain threshold value,
the wheel with the greater slip is braked actively. The threshold value depends on the vehicle speed:It is reduced with increasing vehicle speed down to a constant value.
Pressure Modulation: Depending on the control deviation and the wheel acceleration of the spinning wheel, pressure increase, hold and decrease are made.
The pressure modulation is done with the conventional control with the valves. ASV, USV, EV and AV according the the following table:
Speed Range: ABD is available in the speed range 60 kph.
Above 60 kph vehicle speed, ABD is passive. It is possible to initiate ABD operation up to a vehicle speed of 55kph.
Increase Open
Open
Open
ASV Decrease
Hold
Closed
Closed
Closed
Closed
Closed
Open
Open
Closed
Closed
USV
EVAV
Speed difference driven wheels [kph]
18
6 12 60ABD operation
Vehicle speed[kph]

4F-8 ANTILOCK BRAKE SYSTEM
Temperature Model:ABD operation is a high thermal load for the brakes.
To avoid any damages at the brakes, the disk temperature is calculated with a mathematical model for each driven
wheel separately. After ignition on, the calculation starts with 30 °C and then three different phases are evaluated
separately and added: ABD operation, braking and coling phase.If the temperature is highter than 500 °C, ABD is disabled for this wheel.
It is permitted again, if the model has calculated down the 350 °C.
Lamp Concepts: The system is equipped with an ABD information lamp, which is blinking during ABD operation.The activation of the EBD, ABS warning lamp and the ABD info lampo is summarized in the following table:
IgnitionON ABS
Operation ABD
Operation System failure
(EBD,ABS or ABD are
not distinguished) ABD passive due
to temperature
model
ABS warning lamp
ABD info lamp
EBD warning lamp 2s on for lamp
check
2s on for lamp check
2s on for lamp check OFF
EBD operation / OFFOFF
OFF
Dlinking
(Flashing)
OFF ON
OFF ON OFF OFF OFF

ANTILOCK BRAKE SYSTEM 4F-13
DEFECT CODES
Description
- Replace the ECU
Check resistance of the wheel speed sensor :1.280K - 1.920K
Check wire for ground and open.
Replace the sensor.
Check resistance of the wheel speed sensor :1.280K - 1.920K
Check wire for ground and open.
Replace the sensor.
Check resistance of the wheel speed sensor :1.280K - 1.920K
Check wire for ground and open.
Replace the sensor.
Check resistance of the wheel speed sensor : 1.280K - 1.920K
Check wire for ground and open.
Replace the sensor.
Check wire for ground and open.
Check connection of the wheel speed sensor connec-
tor and ECU side connector.
Measure air gap between wheel teeth and wheel speed sensor and check installation of wheel tooth.(Standard air gap : 0.35 - 1.60 mm)
Check output voltage of the sensor by rotating the wheel 1/2 - 1 revolution per second and shaking sen- sor wire.
- When measured by multi - meter (AC) :
output voltage > 70 mV
- When measured in oscilloscope :
output voltage 120 mV/P-P
Replace the sensor.
Check wire for ground and open.
Check connection of the wheel speed sensor. con-
nector and ECU side connector.
Measure the air gap between wheel teeth and wheelspeed sensor and check installation of wheel tooth.(Standard air gap : 0.35 - 1.60 mm)
Check output voltage of the sensor by rotating thewheel 1/2 - 1 revolution per second and shaking sen- sor wire.
Defect Code
01 0203 0405 06 07 08 Application
Normal Defective ECUFront/left Wheel SpeedSensor (Wire) Front/right Wheel Speed Sensor (Wire) Rear/left Wheel Speed Sensor (Wire) Rear/right Wheel Speed Sensor (Wire) Front/left Wheel Speed Sensor (Signal) Front/right Wheel Speed Sensor (Signal)

4F-14 ANTILOCK BRAKE SYSTEM
Description
- When measured by multi - meter (AC) : output voltage > 70 mV
- When measured in oscilloscope :
output voltage 120 mV/P-P
Replace the sensor.
Check wire for ground and open.
Check connection of the wheel speed sensor con-
nector and ECU side connector.(Standard air gap : 0.15 - 1.20 mm)
Check output voltage of the sensor by rotating the wheel 1/2 - 1 revolution per second and shaking sen- sor wire.
- When measured by multi - meter (AC) :
output voltage > 70 mV
- When measured in oscilloscope :
output voltage 120 mV/P-P
Replace the sensor.
Check wire for ground and open.
Check connection of the wheel speed sensor con-
nector and ECU side connector.
Measure air gap between wheel teeth and wheelspeed sensor and check installation of wheel tooth.(Standard air gap : 0.15 - 1.20 mm)
Check output voltage of the sensor by rotating thewheel 1/2 - 1 revolution per second and shaking sen- sor wire.
- When measured by multi - meter (AC) :
output voltage > 70 mV
- When measured in oscilloscope : output voltage 120 mV/P-P
Replace the sensor.
Check number of teeth on the wheel rotor and itscondition.
- Number of teeth : 52
Check valve relay voltage.
Check connection of connector and terminals in the
ECU and hydraulic modulator.
Check ground.
Check terminals for open or short.(When connector is removed)
Replace the hydraulic modulator.
Defect Code
09 10
11
12 Application
Rear/left Wheel Speed Sensor (Signal) Rear/right Wheel Speed Sensor (Signal) Wheel Rotor
Valve Relay

ANTILOCK BRAKE SYSTEM 4F-19
MAINTENANCE AND REPAIRON-VEHICLE SERVICE
WHEEL SPEED SENSOR
1 Bolt
2 Front Wheel Speed Sensor
3 Knuckle 4 Bolt
5 Rear Wheel Speed Sensor
6 Rear Axle

ANTILOCK BRAKE SYSTEM 4F-21
HYDRAULIC CIRCUIT
ABS 5.3 Pressure Increased
1 Master Cylinder
2 Hydraulic Unit
3 Damping Chamber
4 Return Pump
5 Return Pump Motor 6 Accumulator Chamber
7 Inlet Valve for Each Wheel
8 Outlet Valve for Each Wheel
9 Front Wheel
10 Rear Wheel

4F-22 ANTILOCK BRAKE SYSTEM Pressure Decreased
1 Master Cylinder
2 Hydraulic Unit
3 Damping Chamber
4 Return Pump
5 Return Pump Motor6 Accumulator Chamber
7 Inlet Valve for Each Wheel
8 Outlet Valve for Each Wheel
9 Front Wheel
10 Rear Wheel

ANTILOCK BRAKE SYSTEM 4F-23
Pressure Maintained
1 Master Cylinder
2 Hydraulic Unit
3 Damping Chamber
4 Return Pump
5 Return Pump Motor6 Accumulator Chamber
7 Inlet Valve for Each Wheel
8 Outlet Valve for Each Wheel
9 Front Wheel
10 Rear Wheel