SSANGYONG MUSSO 1998 Workshop Repair Manual

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.

2A-8 SUSPENSION DIAGNOSIS
-
ACTUATOR INSPECTION
Output position of the actuator should be changed as below when battery voltage is applied between actuator
connector terminals.
Connector
terminalBattery VoltagePosition of The Actuator OutputRemark
1 (White)
-
2 (Black)OPEN
3 (Red)
+
1 (White)
+
2 (Black)
-
3 (Red)OPEN
1 (White)OPEN
2 (Black)
+
3 (Red)
SOFT Mode
MEDIUM Mode
HARD Mode

SUSPENSION DIAGNOSIS 2A-9
ECS CIRCUIT
SCHEMATIC AND ROUTING DIAGRAMS

2A-10 SUSPENSION DIAGNOSIS

SUSPENSION DIAGNOSIS 2A-11
Connector Pin Number and Circuits
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
26
Ignition
Actuator R-MEDIUM
Actuator R-SOFT
Actuator F-HEAD
Select Switch
Speed Sensor
Wheel G Sensor
Wheel G Sensor Ground
-
Vertical G Sensor
Sensor +5V
Chassis Ground
Indicator Lamp
NO. CircuitNO. Circuit
1
14
215
316
417
518
619
720
821
922
10 23
11 2 4
12 25
13 26
Chassis Ground
Actuator R-HEAD
Actuator F-MEDIUM
Actuator F-SOFT
Brake Switch
-
Lateral G Sensor
Lateral G Sensor Ground
Vertical G Sensor Ground
Diagnosis K Line
Diagnosis L Line
-
-

2A-12 SUSPENSION DIAGNOSIS
SELF DIAGNOSIS TEST
DIAGNOSIS TEST
Special Tool Requirements : Scanner
1. Position the ignition switch to 'OFF'.
2. Connect Scanner harness connector to the engine
compartment diagnosis socket.
3. Turn the ignition switch to 'ON' position.
4. Select "Electronic control vehicle diagnosis" from function
selection display and press "Enter".
5. Select "Musso ('98 model year)" from vehicle model selection
display and press 'Enter'.
6. Select "Electronic suspension system (ECS)" from control
system selection display and press 'Enter'.
7. Select "Self-diagnosis" from diagnosis item selection display.
Notice
Check sensor value output display, if necessary.
8. Determine the fault code and check defective component.
Notice
Refer to self-diagnosis list.

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 2B
WHEEL ALIGNMENT
TABLE OF CONTENTS
SPECIFICATIONS
WHEEL ALIGNMENT SPECIFICATIONS
Application
Camber
Caster
Toe-in
King Pin InclinationDescription
0° ± 30'
2°30' ± 30'
0 - 4 mm
12°30'
Specifications . . . . . . . . . . . . . . . . . . . . . . . . 2B-1
Wheel Alignment Specifications . . . . . . . . . . . 2B-1
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 2B-2
Tire Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . 2B-2
Radial Tire Lead/Pull . . . . . . . . . . . . . . . . . . . 2B-3
Vibration Diagnosis . . . . . . . . . . . . . . . . . . . . . 2B-5
Maintenance and Repair . . . . . . . . . . . . . . . 2B-6
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . 2B-6Wheel Alignment . . . . . . . . . . . . . . . . . . . . . . . 2B-6
General Description and System
Operation . . . . . . . . . . . . . . . . . . . . . . . . . 2B-9
Four Wheel Alignment . . . . . . . . . . . . . . . . . . 2B-9
Toe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2B-9
Caster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2B-9
Camber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2B-9

2B-2 WHEEL ALIGNMENT
DIAGNOSIS
TIRE DIAGNOSIS
Irregular and Premature Wear
Irregular and premature tire wear has many causes.
Some of them are incorrect inflation pressures, lack of
regular rotation, poor driving habits, or improper wheel
alignment.
Rotate the tires if :
lThe front tire wear is different from the rear.
lThe left and right front tire wear is unequal.
lThe left and right rear tire wear is unequal, Check
wheel alignment if :
lThe left and right front tire wear is unequal.
lThe wear is uneven across the tread of either front
tire.
lThe front tire treads are scuffed with “feather” edges
on the side of the tread ribs or blocks.
Tread Wear Indicators
The original equipment tires have built-in tread wear
indicators to show when the tires need replacement.
These indicators appear as bands when the tire tread
depth becomes shallow. Tire replacement is
recommended when the indicators appear in three or
more grooves at six locations.
Radial Tire Waddle
Waddle is side-to-side movement at the front or rear of
the vehicle. It is caused by the steel belt not being straight
within the tire, or by excessive lateral runout of the tire
or wheel.
The vehicle must be road tested to determine which end
of the vehicle has the faulty tire. The rear end of the
vehicle will shake from side to side or “waddle” if the
waddle tire is on the rear of the vehicle. From the driver’s
seat, it feels as though someone is pushing on the side
of the vehicle. If the faulty tire is on the front of the vehicle,
the waddle is more visual. The front sheet meld appears
to be moving back and forth, and the drivers seat feels
like the pivot point in the vehicle.
Waddle can be diagnosed using the method of
substituting known good tire and wheel assemblies on
the problem vehicle
1. Road test the vehicle to determine if the waddle is
coming from the front or the rear of the vehicle.
2. Install good tires and wheels from a similar vehicle in
place of those on the offending end of the problem
vehicle. If the source of the waddle is not obvious,
change the rear tires.