SsangYong Musso. Manual - part 220

 SUSPENSION DIAGNOSIS  2A-3

DIAGNOSIS

GENERAL DIAGNOSIS

Checks

Loosened Mountings

Damaged or Worn wheel Bearing

Damaged Shock Absorber

Damaged Tire

Action

Retightening

Replace

Replace

Replace

Abnormal Noises

Checks

Broken Stabilizer Bar

Faulty Shock Absorber

Action

Replace

Replace

Vehicle Rolling

Checks

Over Inflated Tire

Faulty Shock Absorber

Loosened wheel Nut

Bent or Broken Coil Spring

Damaged Tire

Worn Bushing

Action

Pressure Adjustment

Replace

Tighten as Specified

Replace

Replace

Replace

Poor Riding

Problems in the steering, the suspension, the tires, and
the wheels involve several systems. Consider all systems
when you diagnose a complaint. Some problems, such
as abnormal or excessive tire wear and scuffed tires,
may by the result of hard driving. Always road test the

vehicle first. If possible, do this road test with the
customer.

Proceed with the following preliminary checks. Correct
any substandard conditions.

Checks

Incorrect Wheel Alignment

Excessive Resistance of Lower Arm Ball Joint

Insufficient Tire Pressure

Faulty Power Steering

Action

Repair

Replace

Adjust

Repair or Replace

Hard Steering

Checks

Deformed Arm Assembly

Worn Bushing

Bent or Broken Coil Spring

Difference Between L/H & R/H Heights

Action

Replace

Replace

Replace

Adjust

Vehicle Pulls to Right or Left

2A-4  SUSPENSION DIAGNOSIS

Checks

Worn or Broken Coil Spring

Checks

Incorrect Front wheel Alignment

Worn or Loosened Lower Arm Bushing

Action

Replace

Repair or Replace

Steering Instability

Action

Replace

Vehicle Bottoming

 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.

Logic

Sensor

Road Sensing Driving Comfort Control Logic

Speed

Vertical

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.