ECU SSANGYONG MUSSO 1998 Workshop Repair Manual

Front
Rear
Front
Rear
SECTION 4F
ANTILOCK BRAKE SYSTEM
TABLE OF CONTENTS
Caution: Disconnect the negative battery cable before removing or installing any electrical unit or when a
tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this
cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK
unless otherwise noted.
SPECIFICATIONS
GENERAL SPECIFICATIONS
Application
Model
ECUNumber of Pins
Operating Temperature
Motor Operating Current
Solenoid Coil Resistance
External Resistance
Air Gap
Number of teethDescription
ABS 5.3
31
-40 ~ +120°C
Below MAX 40A
1.28KW - 1.92KW
0.35 - 1.60 mm
0.15 - 1.20 mm
52
52ABS/ABD 5.3
83
-40 ~ +85°C
Below MAX 45A
8.04 - 9.04W except AV,
HSV 4.04 - 4.54W
1.28KW - 1.92KW
0.35 - 1.60 mm
0.15 - 1.20 mm
52
52 Hydraulic System
Wheel Speed Sensor
Impulse Ring
Specifications . . . . . . . . . . . . . . . . . . . . . . . . 4F-1
General Specifications . . . . . . . . . . . . . . . . . . 4F-1
Schematic and Routing Diagrams . . . . . . . . 4F-2
ABS 5.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4F-2
ABS/ABD 5.0 . . . . . . . . . . . . . . . . . . . . . . . . . 4F-3
ABS 5.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4F-4
ABS/ABD 5.3 . . . . . . . . . . . . . . . . . . . . . . . . . 4F-5
Component Locator . . . . . . . . . . . . . . . . . . . 4F-6
ABS, ABS/ABD . . . . . . . . . . . . . . . . . . . . . . . . 4F-6
ABD System Description . . . . . . . . . . . . . . . 4F-7Self Diagnosis . . . . . . . . . . . . . . . . . . . . . . . 4F-9
ABS, ABS/ABD 5.3 . . . . . . . . . . . . . . . . . . . . . 4F-9
ABS, ABS/ABD 5.0 . . . . . . . . . . . . . . . . . . . . 4F-11
Defect Codes . . . . . . . . . . . . . . . . . . . . . . . . 4F-13
Maintenance and Repair . . . . . . . . . . . . . . 4F-19
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . 4F-19
Wheel Speed Sensor . . . . . . . . . . . . . . . . . . 4F-19
Hydraulic Circuit . . . . . . . . . . . . . . . . . . . . 4F-21
ABS 5.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4F-21
ABS/ABD 5.3 . . . . . . . . . . . . . . . . . . . . . . . . 4F-24

4F-6 ANTILOCK BRAKE SYSTEM
ABS,ABS/ABD
COMPONENT LOCATOR
1 ABS Hydraulic Unit
2 ABS/ABD Hydraulic Unit
3 Diagnosis Socket
4 Front Wheel Speed Sensor
5 Front Impulse Ring6 Rear Wheel Speed Sensor
7 Rear Impulse Ring
8 ABS Warning Indicator Light
9 TCS Indicator Light
1 0 ABS/ABD ECU

ANTILOCK BRAKE SYSTEM 4F-9
SELF DIAGNOSIS
ABS, ABS/ABD 5.3
Initialization
1. Turn the ignition switch to "ON" position.
2. Using a service connector, ground the No.13 terminal of
diagnosis socket and No.1 ground terminal for 3 - 4 seconds.
Notice
If it is over 5 seconds, initialization will not be performed.
3. After completing the initialization, ABS warning lamp will be
turned on until the ignition switch is turned to "OFF" position.
Output of Fault Code
1. Normal : 1 pulse (normal code 01)
2. Abnormal : 1 pulse (fault code)
Notice
lIf appeared initial fault code and above 2 differnt fault
code, perform again initialization.
lFault code will be output the numbers of fault code with
a interval of 1 second.(turn on : 0.75 sec., turn off : 0.25
sec.)
Fault Code Elimination
After repairing the defect parts, eliminate the fault from ECU.
1. Ground the diagnosis No.13 terminal to No.1 ground terminal
for over 5 seconds.
2. Turn the igniotion switch to "OFF" position.
Notice
lIf not eliminate the fault code, the code will be maintained.
lCheck and find the other defect parts with performing
the imitialization again, if the fault code will be output,
repair the defect parts completely.

ANTILOCK BRAKE SYSTEM 4F-11
ABS, ABS/ABD 5.0
Initializing
1. Set the ignition switch n “ON” position.
2. Connect the No.1 terminal (Ground) and the No.13 (ABS)
from diagnosis socket located in E/G room by use of service
connector for 3 - 4 seconds and initialize the flash code.
Notice
Be careful not to connect over 5 seconds.
3. ABS indicator warning light continuously comes on until the
ignition switch is “OFF”.
Dignosis Table
1. When the system is normal
lOne pulse (normal code 01) indicates.
2. When the system is abnormal
lOne pulse (defect code) indicates.
Notice
Repeat the initializing procedure when checking the
defect code Defect code is indicated once for 1 sec (light
on : 0.75 sec, light off : 0.25 sec).
Removal the Defect Code
1. Repair the defect code and remove the memorized defect
code in the ECU.
2. Connect the No. 13 terminal (ABS) from diagnosis socket
and No. 1 terminal (ground) for over 5 seconds.
3. Set the ignition switch in the “OFF” position.
Notice
lDefect code will be memorized in ECU unless the defect
code is not removed.
lRepeat the initializing procedure and check the other
defects.

ANTILOCK BRAKE SYSTEM 4F-13
DEFECT CODES
Description
-
Replace the ECU
lCheck resistance of the wheel speed sensor :
1.280KW - 1.920KW
lCheck wire for ground and open.
lReplace the sensor.
lCheck resistance of the wheel speed sensor :
1.280KW - 1.920KW
lCheck wire for ground and open.
lReplace the sensor.
lCheck resistance of the wheel speed sensor :
1.280KW - 1.920KW
lCheck wire for ground and open.
lReplace the sensor.
lCheck resistance of the wheel speed sensor :
1.280KW - 1.920KW
lCheck wire for ground and open.
lReplace the sensor.
lCheck wire for ground and open.
lCheck connection of the wheel speed sensor connec-
tor and ECU side connector.
lMeasure air gap between wheel teeth and wheel speed
sensor and check installation of wheel tooth.
(Standard air gap : 0.35 - 1.60 mm)
lCheck 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 ³ 120 mV/P-P
lReplace the sensor.
lCheck wire for ground and open.
lCheck connection of the wheel speed sensor. con-
nector and ECU side connector.
lMeasure the air gap between wheel teeth and wheel
speed sensor and check installation of wheel tooth.
(Standard air gap : 0.35 - 1.60 mm)
lCheck output voltage of the sensor by rotating the
wheel 1/2 - 1 revolution per second and shaking sen-
sor wire. Defect Code
01
02
03
04
05
06
07
08Application
Normal
Defective ECU
Front/left Wheel Speed
Sensor (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 ³ 120 mV/P-P
lReplace the sensor.
lCheck wire for ground and open.
lCheck connection of the wheel speed sensor con-
nector and ECU side connector.
(Standard air gap : 0.15 - 1.20 mm)
lCheck 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 ³ 120 mV/P-P
lReplace the sensor.
lCheck wire for ground and open.
lCheck connection of the wheel speed sensor con-
nector and ECU side connector.
lMeasure air gap between wheel teeth and wheel
speed sensor and check installation of wheel tooth.
(Standard air gap : 0.15 - 1.20 mm)
lCheck 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 ³ 120 mV/P-P
lReplace the sensor.
lCheck number of teeth on the wheel rotor and its
condition.
- Number of teeth : 52
lCheck valve relay voltage.
lCheck connection of connector and terminals in the
ECU and hydraulic modulator.
lCheck ground.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator. Defect Code
09
10
11
12Application
Rear/left Wheel Speed
Sensor (Signal)
Rear/right Wheel Speed
Sensor (Signal)
Wheel Rotor
Valve Relay

ANTILOCK BRAKE SYSTEM 4F-15
Description
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck 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 Valve
Defect Code
13
14
15
16
17
18
19

4F-16 ANTILOCK BRAKE SYSTEM
Description
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator.
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator
lCheck solenoid internal resistance of the prime(ASV)
valve and pilot valve(USV) : 8.04 - 9.04 W
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU and hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator
lCheck solenoid internal resistance of the prime(ASV)
valve and pilot valve(USV) : 8.04 - 9.04 W
lCheck each valve by using SCANNER's solenoid valve
overriding function.
lCheck connection of connector and terminals in the
ECU and hydraulic modulator.
lCheck terminals for open or short.
(When connector is removed)
lReplace the hydraulic modulator
lCheck each valve by using SCANNER's pump motor
overriding function.
lCheck resistance between pump motor ground ter-
minal and battery negative terminal : total resistance
should be less than 15 mW
lCheck body ground location.
lCheck relay supply voltage : IGN on : 11 - 14 V
lRelay coil internal resistance : 70 - 80 W
lReplace the hydraulic modulator
lCheck by using SCANNER's stop lamp switch diag-
nosing function from sensor value output function.
lCheck connection of ECU connector side stop lamp
switch terminal.
lCheck 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 Switch
Defect Code
20
21
22
24
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 mW
lWhen 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
lCheck battery voltage.
lResistance between ECU (ABD:No.28 & 29,
ABS:No.19) pins and battery negative terminal :
less than 20 mW
lResistance between ECU No.1 (ABS:NO.15) pin and
ignition terminal : less than 60 mW
lCheck that normal voltage is applied to ECU
(ABD:No.1, ABS:No.15) pin when ignition switch is
turned to "ON" or "OFF".
lCheck ABS fuses of 15A and 80A.
lReplace the ECU.
lCheck wire (ECU No.50) for open or loose contact.
lCheck connection between connectors.
lCheck relevant wires for open or short.
(When connector is removed)
lCheck 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
lCheck 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 SYSTEM
ApplicationDefect CodeDescription
lCheck connection between connectors.
lCheck relevant wires for open or short.
(When connector is removed)
lCheck and replace the acceleration sensor.
lReplace the ECU.
lCheck 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
lCheck 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) 43Acceleration Sensor Signal (Signal)