1998 SSANGYONG MUSSO ECU

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)

4F-20 ANTILOCK BRAKE SYSTEM
Removal & Installation Procedure
ABS Hydraulic Unit
1. Release the ABS wiring connector locking lever in arrow
direction and remove the connector.
Notice
lDo not force the connector when releasing in arrow
direction.
lFor 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 Torque12 - 16 Nm
Notice
When carrying a new unit, never recline it over 30°.

5A-24 AUTOMATIC TRANSMISSION
Transmission Control Unit(TCU)
The TCU is an in-vehicle micro-processor based transmission management system. It is usually mounted in the
vehicle cabin, under the instrument panel, under the seat, behind the side kick panels or under the floor in the
footwell on the passenger side. Different control units are supplied for different vehicle applications.
The TCU contains:
lProcessing logic circuits which include a central microcontroller and a back-up memory system.
lInput circuits.
lOutput circuits which control external devices such as the variable pressure solenoid (VPS), on/off solenoid
drivers, a diagnostics output and the driving mode indicator light.
The various items which make up the TCU are discussed below.
Processing Logic
Shift schedule and calibration information is stored in an erasable programmable read only memory (EEPROM).
Throttle input calibration constants and the diagnostics information are stored in electrically erasable programmable
read only memory (EEPROM) that retains the memory even when power to the TCU is disconnected.
In operation the software continuously monitors the input values and uses these, via the shift schedule, to determine
the required gear state, At the same time it monitors, via the solenoid outputs, the current gear state. Whenever the
input conditions change such that the required gear state is different to the current gear state, the TCU initiates a
gear shift to bring the two states back into line.
Once the TCU has determined the type of gear shift required the software accesses the shift logic, estimates the
engine torque output, adjusts the variable pressure solenoid ramp pressure then executes the shift.
The TCU continuously monitors every input and output circuit for short or open circuits and operating range. When
a failure or abnormal operation is detected the TCU records the condition code in the diagnostics memory and
implements a limp mode, The actual limp mode used depends upon the failure detected with the object to maintain
maximum driveability without damaging the transmission. In general input failures are handled by providing a default
value. Output failures, which are capable of damaging the transmission, result in full limp mode giving only third or
fourth gear and reverse. For further details of limp modes and memory retention refer to the Diagnostic Section.
The TCU is designed to operate at ambient temperatures between -40 and 85°C . It is also protected against
electrical noise and voltage spikes, however all the usual precautions should be observed, for example when arc
welding or jump starting.
TCU Inputs
To function correctly, the TCU requires engine speed, road speed, transmission sump temperature, throttle position
and gear position inputs to determine the variable pressure solenoid current ramp and on/off solenoid states. This
ensures the correct gear selection and shift feel for all driving conditions.
The inputs required by the TCU are as follows:
lEngine Speed
The engine speed signal is derived from the tachometer signal line, a dedicated sensor or a Controlled Area
Network (CAN).
lRoad Speed
4WD (Diesel) - The shaft speed signal is derived from the speedo sensor located on the transfer case. This signal
is transmitted directly to the TCU.
4WD (Gasoline) - The speedo sensor sends the shaft speed signal to the engine control module (ECM). The
information is then transferred to the TCU via the CAN.
lTransmission Sump Temperature
The transmission sump temperature sensor is a thermistor located in the solenoid wiring loom within the transmission.
This sensor is a typical NTC resistor with low temperatures producing a high resistance and high temperatures