ECU SSANGYONG MUSSO 1998 Workshop Owners Manual

M161 ENGINE CONTROLS 1F2-77
2. Measure the resistance between the coolant temperature
sensor terminal No.1 and No.4 with the coolant temperature
sensor disconnected.
Inspection
1. Measure the coolant sensor input voltage between the ECU
terminal No.79 and No.78 while the ignition switch in "ON"
position.
Notice
Replace wiring and coolant temperature sensor if out of
specified value.
allowable error :±5%
allowable error :±5%
Voltage (V)
3.57
1.22
0.78 Temperature (°C)
20
30
40
Resistance (W)
2,500
322
185 Temperature (°C)
20
30
40

M162 ENGINE INTAKE & EXHAUST 1G1-3
Removal & Installation Procedure
1. Release the clamp securing HFM sensor and air cleaner.
2. Disengage the air cleaner assembly and HFM sensor
assembly.
3. Unserew the mounting bolt(6) from the bracket.
Installation Notice
Tightening Torque 22.5 - 27.5 Nm
4. Release the clamp from air cleaner assembly housing and
remove the cover.
5. Remove the air cleaner assembly.
6. Remove the air cleaner housing from insulator.
Notice
Make sure the air cleaner to be seated in insulator.
7. Disengage the air duct hose and air cleaner housing and
remove the housing.
8. Remove the air duct hose.
9. Unscrew the two bolts(7) from air inlet duct.
Installation Notice
10. Remove the air inlet duct.
11. Installation should follow the removal procedure in the
reverse order.
Tightening Torque 8 - 9 Nm

1G1-8 M162 ENGINE INTAKE & EXHAUST
Function Description
A pneumatically actuated resonance flap (5) is located on the
intake manifold, and will be opened and closed by load, which
operates resonance flap according to engine and controlled
by ECU and rpm.
1. Resonance flap closed (at idle/partial load : less than
3,800/rpm)
The switch valve (7) will be adjusted by ECU and resonance
falp will be colosed. By increasing air flow passage through
dividing intaking air flow toward both air collection housing
(8). This leads to a signficant increase in the torque in the
lower speed range.
2. Resonance flap open (at full load : over 3,800/rpm)
The switch valve (7) will not be adjusted by ECU and
resonance falp (5) will be open. The colllected air in the air
collection housing (8) will not be divided and intaking air
passage will be shorten.

M161 ENGINE INTAKE & EXHAUST 1G2-3
Removal & Installation Procedure
1. Release the clamp securing HFM sensor and air cleaner.
2. Disengage the air cleaner assembly and HFM sensor
assembly.
3. Unserew the mounting bolt(6) from the bracket.
Installation Notice
Tightening Torque 22.5 - 27.5 Nm
4. Release the clamp from air cleaner assembly housing and
remove the cover.
5. Remove the air cleaner assembly.
6. Remove the air cleaner housing from insulator.
Notice
Make sure the air cleaner to be seated in insulator.
7. Disengage the air duct hose and air cleaner housing and
remove the housing.
8. Remove the air duct hose.
9. Unscrew the two bolts(7) from air inlet duct.
Installation Notice
10. Remove the air inlet duct.
11. Installation should follow the removal procedure in the
reverse order.
Tightening Torque 8 - 9 Nm

SUSPENSION DIAGNOSIS 2A-5
INPUT & OUTPUT DEVICES AND DAMPING FORCE
CONTROL LOGIC
INPUT & OUTPUT DEVICES
Damping force of shock absorber will rotate shock absorber control rod in 3 modes by driving actuator on the upper
shock absorber when signaled from ECS.
Rotary valve in the shock absorber will control hydraulic flow according to rotation of control rod to adjust damping
force of shock absorber in SOFT«MEDIUM«HARD.
SYSTEM LAYOUT
1 ECS (ECU)
2 Body Vertical Acceleration Sensor (Vertical
Sensor)
3 Body Lateral Acceleration Sensor (Lateral
Sensor)
Speed Sensor
Axle Vertical Acceleration Sensor
(Wheel G Sensor)
Stop Lamp Switch
Body Vertical Acceleration Sensor
(Vertical Sensor)
ECS Switch
Indicator Lamp
Actuator
Shock Absorber
Self-Diagnosis Connector
Damping Force Adjustment
ECS
(ECU)
Body Lateral Acceleration Sensor
(Lateral Sensor)
4 ECS Mode Switch
5 Stop Lamp Switch
6 Axle Vertical Acceleration Sensor (Wheel G
Sensor)
7 Mode Actuator

2A-6 SUSPENSION DIAGNOSIS
DAMPING FORCE CONTROL LOGIC
Control Logic that applies on damping force variable suspension is comprised of road sensing driving comfort control
logic to increase driving comfort and vehicle speed sensing control logic, anti-roll control logic and anti-dive control
logic to secure control safety.
LogicSensor
Road Sensing Driving Comfort Control LogicSpeedVertical
Sensor (2.5g)Lateral
Sensor (1g)Axle
Acceleration
Sensor (10g)Brake
Anti-bounce Control Logic
Anti-roll Control Logic
Anti-dive Control Logic
Vehicle Speed Sensing Control Logic
NORMAL CONTROL
Initial Stage
When ignition switch is "ON", system initialization will be performed for approx. 3 seconds. During this time, warning
lamp will stay ON and damping force will be switched to Hard status. After 3 seconds, warning lamp will turn off and
normal control status will be restored.
Normal Damping Force Control Establishment
Damping force will have Soft®Medium®Hard status in AUTO mode and Medium®Hard status in SPORT mode.
When double control items are satisfied at the same time it will be Hard®Medium®Soft in order.
Normal Damping Force Control Release
Control mode release will be "Hard®Medium®Soft"or "Medium®Soft". In case that returned from Hard status to
Medium status during control, it will be done after elapse of setting times. Returning from Medium status to Soft status
will be done immediately without delay.

SUSPENSION DIAGNOSIS 2A-7
SELF-DIAGNOSIS
ECS-ECU indicates ECS circuit defectives to the driver by flickering ECS indicator lamp in the meter cluster 0.5
second of interval if there are defectives.
Code
Body vertical
acceleration
sensor Defects
When sensor output
voltage is less than
0.5-4.5V, more than
4.5V. Judging Conditions01
0.9 - 1.1sec.Set TimeSensor Voltage
³2.0 ± 0.1V
³3.0 ± 0.1V
Release Conditions
0.9 - 1.1sec.Set Time
Body lateral
acceleration
sensorWhen sensor output
voltage is less than
0.55±0.15V, more than
4.45±0.1V. 02
0.9 - 1.1sec.
Sensor Voltage
³2.0 ± 0.1V
³3.0 ± 0.1V
0.9 - 1.1sec.
Stop anti-
bounce ride
control Remedy
Stop anti-roll
control
Axle vertical
acceleration
sensor (wheel G
sensor)When sensor output
voltage is less than
0.5-4.5V, more than
4.5V. 03
0.9 - 1.1sec.
Sensor Voltage
³2.0 ± 0.1V
³3.0 ± 0.1V
0.9 - 1.1sec.
Stop ride
control
Front actuatorCheck step motor
power supply detecting
circuit for open and
short.
check for relative
connectors. 04
0.4 - 0.6sec.
IGN+ SW.
OFF®
ONStop control
after returning
to the previ-
ous mode
Rear actuatorWhen defective detect-
ing circuit has detected
defectives during
output OFF. 05
0.4 - 0.6sec.IGN+ SW.
OFF®
ONStop control
after returning
to the previous
mode
ECU
When ECU does not
work normally. 06
0.4 - 0.6sec.Reset
Stop control
1. Turn the ignition switch ON and if ECS system is normal, ECS indicator lamp will turn on for 3 seconds and then go
off. However if defective, ECS indicator lamp will flicker in the interval of 0.5 second continuously.
2. Identify fault code with Scanner.

SUSPENSION DIAGNOSIS 2A-13
Self - Diagnosis List
Fault
CodeDefectsService Hint
01 Vertical Acceleration Sensor
02 Lateral Acceleration Sensor
03 Wheel Acceleration Sensor
04
05 Rear Step Motor
0 6 ECUFront Step Motor1. Check sensor supply voltage
lCondition - IGN ON
lStandard value - voltage between pin 11 and 8 of ECU :
4.5 - 5.0V
2. Check sensor output voltage
lCondition - IGN ON
lStandard value - voltage between pin 20 and 11 of ECU
: 0.5 - 4.5V
3. Check the sensor.
4. Check circuit for open.
5. Check connection of other connectors.
1. Check sensor supply voltage
lCondition - IGN ON
lStandard value - voltage between pin 11 and 8 of ECU :
4.5 - 5.0V
2. Check sensor output voltage
lCondition - IGN ON
lStandard value - voltage between pin 10 and 11 of ECU
: 0.5 - 4.5V
3. Check the sensor.
4. Check circuit for open.
5. Check connection of other connectors.
1. Check step motor supply voltage.
2. Check circuit for open.
3. Check connection of other connectors.
1. Check step motor supply voltage.
2. Check circuit for open.
3. Check connection of other connectors.
1. Check connectors of ECU.
2. Replace the ECU. 1. Check sensor supply voltage
lCondition - IGN ON
lStandard value - voltage between pin 11, 8 and pin
7,11 of ECU : 4.5 - 5.0V
2. Check sensor output voltage
3. Check the sensor.
4. Check circuit for open.
5. Check connection of other connectors.

SECTION 2C
FRONT SUSPENSION
TABLE OF CONTENTS
SPECIFICATIONS
GENERAL SPECIFICATIONS
Type
Spring Type
Torsion Bar
Shock Absorber
Stabilizer TypeDouble Wishbone
Torsion Bar Spring
1,040 mm
24.5 mm
Cylindrical Reciprocation Type
Torsion Bar Spring
Specifications . . . . . . . . . . . . . . . . . . . . . . . . 2C-1
General Specifications . . . . . . . . . . . . . . . . . . 2C-1
Fastener Tightening Specifications . . . . . . . . . 2C-2
Component Locator . . . . . . . . . . . . . . . . . . . 2C-3
Front Suspension . . . . . . . . . . . . . . . . . . . . . . 2C-3
Maintenance and Repair . . . . . . . . . . . . . . . 2C-4
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . 2C-4
Front Stabilizer Bar . . . . . . . . . . . . . . . . . . . . . 2C-4
ApplicationDescription Torsion Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . 2C-6
Front Lower and Upper Arm . . . . . . . . . . . . . . 2C-8
Front Shock Absorber . . . . . . . . . . . . . . . . . 2C-10
Axle Vertical Acceleration Sensor
(Wheel G Sensor) . . . . . . . . . . . . . . . . . . . 2C-12
Vertical and Lateral Sensor . . . . . . . . . . . . . . 2C-13
ECS (ECU) . . . . . . . . . . . . . . . . . . . . . . . . . . 2C-14
Length
Outer Diameter(
f)

2C-14 FRONT SUSPENSION
ECS (ECU)
1 Electronically Controlled Suspension (ECU)
2 Connector
3 Bolts (2 pieces)
Removal & Installation Procedure
1. Disconnect each connectors from the console box and
remove the console box.
2. Disconnect ECU connector.
3. Unscrew 10mm x 2 bolts and remove ECS (ECU).
4. Installation should follow the removal procedure in the
reverse order.
4 Parking Brake Lever
5 Over Voltage Protection Relay