2003 SSANGYONG MUSSO sensor

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

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

5A-22 AUTOMATIC TRANSMISSIONCONTROL SYSTEMS
GENERAL
There are two control systems associated with the transmission. The electronic control system monitors vehicle
parameters and adjusts the transmission performance. The hydraulic control system implements the electronic controlsystem commands. ELECTRONIC CONTROL SYSTEM
The electronic control system is comprised of sensors, a TCU and seven solenoids. The TCU reads the inputs, and
under software control activates the outputs according to values stored in read only memory (ROM).
The TCU controls the hydraulic control system. This control is via the hydraulic valve body, which contains seven
electro-magnetic solenoids. Six of the seven solenoids are used to control the line pressure, operate the shift valves
and the torque converter lock-up clutch, and to turn on and off the two regulator valves (The two regulator valvescontrol the shift feel.).
The seventh solenoid is the proportional or variable pressure solenoid (VPS) which works with the two regulator
valves to control shift feel.
Figure 3.1 details a typical TCU control system schematic.
The individual component locations, operation and specifications which make up the electronic control subsystem are covered in this section.
Figure 3.1 - Typical TCU Control System Schematic

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:
Processing logic circuits which include a central microcontroller and a back-up memory system.
Input circuits.
Output 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: Engine Speed
The engine speed signal is derived from the tachometer signal line, a dedicated sensor or a Controlled Area Network (CAN).
Road 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.
Transmission 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

AUTOMATIC TRANSMISSION 5A-25
producing a low resistance.
Temperature/Resistance characteristics and location within the solenoid wiring loom are given in tables 3-1 and 3- 2, and figures 3.2 and 3.3.
If the transmission sump temperature exceeds 135°C, the TCU will impose converter lock-up at lower vehicle
speeds and in some vehicles flashes the mode indicator lamp. This results in maximum oil flow through the
external oil cooler and eliminates slippage in the torque converter. Both these actions combine to reduce the oil
temperature in the transmission.
Connects To
Solenoid 1 Solenoid 2Solenoid 3Solenoid 4Solenoid 5 Solenoid 6 Solenoid 7Solenoid 5
Temp Sensor
Temp SensorWire Color Red
Blue
Yellow
Orange GreenViolet
Brown
Green White WhitePin No.
1 2345 6 789
10
Table 3.2 - Pin No. Codes for Temperature Sensor Location In Solenoid Loom
Figure 3.3 - Temperature Sensor Location in Solenoid Loom