SSANGYONG MUSSO 2003 Service Manual

4F-12 ANTILOCK BRAKE SYSTEM Diagnosis the Flash Code
[ex]
Time differences of nromal code 01 : TW1 Time differences of fault code 15 : TW1 Time Characteristics
1. Initialization Tba < 5.0 sec. Tba 1.8 - 2.2 sec.
2. Output of fault code TW1 = 1.8 - 2.2 sec. TW2 = 1.8 - 2.2 sec.
T = 0.75 sec., Te 0.25 sec.
3. Elimination of fault code Tb1 = 5.0 sec.

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-15
Description
Check each valve by using SCANNER's solenoid valve overriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check each valve by using SCANNER's solenoid valveoverriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short. (When connector is removed)
Replace the hydraulic modulator.
Check each valve by using SCANNER's solenoid valve overriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short. (When connector is removed)
Replace the hydraulic modulator.
Check each valve by using SCANNER's solenoid valve overriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short.(When connector is removed)
Replace the hydraulic modulator.
Check each valve by using SCANNER's solenoid valveoverriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short.(When connector is removed)
Replace the hydraulic modulator.
Check each valve by using SCANNER's solenoid valveoverriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short.(When connector is removed)
Replace the hydraulic modulator.
Check each valve by using SCANNER's solenoid valveoverriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short.
Application
Front / left INLET Valve
Front / left OUTLET Valve
Front / right INLET Valve
Front / right OUTLET Valve
Rear / left INLET Valve (ABD)
Rear / left OUTLET Valve
Rear / Right INLET ValveDefect Code
13 14 15 1617 18 19

4F-16 ANTILOCK BRAKE SYSTEM
Description
Check terminals for open or short. (When connector is removed)
Replace the hydraulic modulator.
Check each valve by using SCANNER's solenoid valve overriding function.
Check connection of connector and terminals in the
ECU hydraulic modulator.
Check terminals for open or short. (When connector is removed)
Replace the hydraulic modulator
Check solenoid internal resistance of the prime(ASV) valve and pilot valve(USV) : 8.04 - 9.04
Check each valve by using SCANNER's solenoid valve overriding function.
Check connection of connector and terminals in the
ECU and hydraulic modulator.
Check terminals for open or short.(When connector is removed)
Replace the hydraulic modulator
Check solenoid internal resistance of the prime(ASV)valve and pilot valve(USV) : 8.04 - 9.04
Check each valve by using SCANNER's solenoid valveoverriding function.
Check connection of connector and terminals in the
ECU and hydraulic modulator.
Check terminals for open or short.(When connector is removed)
Replace the hydraulic modulator
Check each valve by using SCANNER's pump motoroverriding function.
Check resistance between pump motor ground ter-minal and battery negative terminal : total resistanceshould be less than 15 m
Check body ground location.
Check relay supply voltage : IGN on : 11 - 14 V
Relay coil internal resistance : 70 - 80
Replace the hydraulic modulator
Check by using SCANNER's stop lamp switch diag-nosing function from sensor value output function.
Check connection of ECU connector side stop lamp switch terminal.
Check resistance of the stop lamp, switch.
- Each end resistance value of the switch
Application
Rear / Right OUTLET Valve Function and Response of The
Valve Function and Response of The
Valve Motor Relay / Circulation Pump Stop Lamp SwitchDefect Code
20 21 2224 27

ANTILOCK BRAKE SYSTEM 4F-17
Application
Power Voltage
Residual Temperature Measurement (ABD only) Acceleration Sensor Signal (wire)Defect Code
28 29 42Description
when switch knob (planger) is pressed by 3mm :
- Each ends resistance value of the switch when switch knob(plunger) is not pressed : less than 200 m
When brake is applied :
ECU (ABS:No.14, ABD:No.48) terminal 11 - 14 V
or VBattery.When brake is released : ECU (ABS:No.14, ABD:No.48) terminal 0 V
Check battery voltage.
Resistance between ECU (ABD:No.28 & 29,
ABS:No.19) pins and battery negative terminal :
less than 20 m
Resistance between ECU No.1 (ABS:NO.15) pin and
ignition terminal : less than 60 m
Check that normal voltage is applied to ECU
(ABD:No.1, ABS:No.15) pin when ignition switch is turned to "ON" or "OFF".
Check ABS fuses of 15A and 80A.
Replace the ECU.
Check wire (ECU No.50) for open or loose contact.
Check connection between connectors.
Check relevant wires for open or short.(When connector is removed)
Check voltage between ECU side ground (ABD:No.1,
ABS:No.15 pin) and acceleration sensor side ground(ABD:No.1, ABS:No.15 pin / ECU side ABD:No.39, ABS:No.30 pin)
(When connector is installed and power is applied)
- Voltage : less than 0.25 V
Check voltage among related terminals.(When connector is installed and power is applied)
- Voltage between ECU (ABD:No.43, ABS:No.28 pin
and ABD:No.39, ABS:No.30 pin) : 4.75 - 5.25 V
- Signal voltage between ECU (ABD:No.51, ABS:No.10) pin and (ABD:No.39, ABS:No.30) pin : 1.95 V - 3.45 V
(Measure it by laying acceleration sensor horizon- tally and without external force)

4F-18 ANTILOCK BRAKE SYSTEMApplication
Defect Code Description
Check connection between connectors.
Check relevant wires for open or short. (When connector is removed)
Check and replace the acceleration sensor.
Replace the ECU.
Check voltage between ECU side ground (ABD:No.1,ABS:No.15 pin) and acceleration sensor side ground(ABD:No.1, ABS:No.15 pin / ECU side ABD:No.39,ABS:No.30 pin) (When connector is installed and power is applied)
- Voltage : less than 0.25 V
Check voltage among related terminals.(When connector is installed and power is applied)
- Voltage between ECU (ABD:No.51, ABS:No.10
pin and ABD:No39, ABS:No.30) pin: 4.75 - 5.25 V
- Signal voltage between ECU (ABD:No.51, ABS:No.10 pin and ABD:No39, ABS:No.30) pin: 1.95 V - 3.45 V (Measure it by laying acceleration sensor horizon tally and without external force)
43
Acceleration Sensor Signal (Signal)

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

4F-20 ANTILOCK BRAKE SYSTEM
Removal & Installation Procedure ABS Hydraulic Unit
1. Release the ABS wiring connector locking lever in arrowdirection and remove the connector. Notice
Do not force the connector when releasing in arrow
direction.
For installation of the connetor, align and firmly seat
the connector of the hydraulic unit and wiring connector while keeping the locking lever upward and then push it down.
2. Remove the hydraulic lines of the hydraulic unit. During removal, be careful not to drip brake fuid on the
body. Installation Notice
3. Unscrew hydraulic unit mounting nuts (2EA) and remove the unit from the bracket.Installation Notice
Tightening Torque 9 - 12 Nm
Removal of the ABS / ABD Unit Location : Under the front passenger's seat.
1. Remove the wiring connector of the ABS/ABD(or ABS:attached type) ECU.
2. Remove the ground wire.
3. Unscrew the mounting bolts and remove the ECU.
4. Installation should follow the removal precedure in reverse order.
Tightening Torque 12 - 16 Nm
Notice When carrying a new unit, never recline it over 30 °.

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