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Daewoo Matiz (2003 year). Manual - part 106

SECTION 2A

SUSPENSION DIAGNOSIS

TABLE OF CONTENTS

Diagnostic Information and Procedures

2A-1

. . . . .

General Diagnosis

2A-1

. . . . . . . . . . . . . . . . . . . . . . . . .

Wheel Bearing Diagnosis

2A-6

. . . . . . . . . . . . . . . . . . .

DIAGNOSTIC INFORMATION AND PROCEDURES

GENERAL DIAGNOSIS

Problems in the steering, the suspension, the tires, and
the wheels involve several systems. Consider all sys-
tems when you diagnose a complaint. Some problems,
such as abnormal or excessive tire wear and scuffed
tires, may be 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.

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Application

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Checks

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Correction

Preliminary Checks

Inspect the tires for improper pressure
and uneven wear.

Inflate the tires to the proper pressure.

Inspect the joint from the steering
column to the intermediate shaft for
loose connections or wear.

Inspect the joint from the intermediate
shaft to the steering gear for loose
connections or wear.

Tighten the coupling flange pinch
bolts.

Replace the intermediate shaft as
needed.

Inspect the front and the rear
suspension, the steering gear, and the
linkage for loose or damaged parts.

Tighten the front and the rear
suspension.

Tighten the steering gear mounting
bracket bolts.

Replace the front and the rear
suspension as needed.

Replace the steering gear as needed.

Replace the coupling flange as
needed.

Inspect for out–of–round tires.

Perform free runout test.

Match–mount the tires.

Inspect for out–of–balance tires, bent
wheels, and worn or loose wheel
bearings.

Balance the wheels.

Replace the wheels.

Replace the wheel bearings.

Check the power steering pump drive
belt tension.

Tighten the power steering pump drive
belt.

Inspect the power steering system.
Also, check the power steering fluid
level.

Repair any leaks.

Perform a power steering gear test.

Add power steering fluid.

2A – 2 SUSPENSION DIAGNOSIS

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Condition

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Probable Cause

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Correction

Car Lead/Pull

Mismatched or uneven tires.

Replace the tires.

A broken or a sagging coil spring.

Replace the coil spring.

A improperly radial tire lateral force.

Check the wheel alignment.

Switch the tire and wheel assemblies.

Replace the tires as needed.

The front–wheel alignment is
out–of–align.

Align the front wheels.

Off–center steering gear.

Reseat the pinion valve assembly.

Replace the pinion valve assembly as
needed.

Front–brake dragging.

Adjust the front brakes.

Abnormal or Excessive
Tire Wear

The front–wheel and rear–wheel
alignment is out–of–align.

Align the front and the rear wheels.

Excessive toe.

Adjust the toe.

A broken or a sagging coil spring.

Replace the coil spring.

Out–of–balance tires.

Balance the tires.

Worn strut dampeners.

Replace the strut dampeners.

A failure to rotate tires.

Rotate the tires.

Replace the tires as needed.

Overloaded vehicle.

Maintain the proper load weight.

Low tire inflation.

Inflate the tires to the proper pressure.

Scuffed Tires

Incorrect toe.

Adjust the toe.

A twisted or a bent suspension arm.

Replace the suspension arm.

Wheel Tramp

An out–of–balance tire or wheel.

Balance the tire or the wheel.

Improper strut dampener action.

Replace the strut dampeners.

Shimmy, Shake, or

An out–of–balance tire or wheel.

Balance the tire or the wheel.

Vibration

Excessive wheel hub runout.

Measure the hub flange runout.

Replace the hub as needed.

Excessive brake drum or brake rotor
imbalance.

Adjust the brakes.

Replace the brake rotor or the brake
drum as needed.

Worn tie rod ends.

Replace the tie rod ends.

Wheel trim imbalance.

Balance the wheel.

A worn ball joint.

Replace the control arm and ball joint
assembly.

Excessive wheel runout.

Measure the wheel runout.

Replace the wheel as needed.

Excessive loaded radial runout on the
tire and wheel assembly.

Match–mount the tire and wheel
assembly.

SUSPENSION DIAGNOSIS 2A – 3

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Condition

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Probable Cause

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Correction

Hard Steering (Manual)

A lack of lubrication of the ball joints,
the tie rods and the steering gear.

Lubricate the ball joints, the tie rods,
and the steering gear.

Replace the control arm and ball joint
assembly, the tie rods, and the
steering gear as needed.

The front–wheel alignment is
out–of–align.

Align the front wheels.

Steering gear adjustment is
out–of–adjustment.

Adjust the steering gear.

Hard Steering (Power)

The steering preload adjustment is
out–of–adjustment.

Perform a rack bearing preload
on–vehicle adjustment.

The leaked hydraulic system.

Test the power steering system
pressure with a gauge.

Replace the seals and the hoses as
needed.

A loose steering gear mounting.

Tighten the steering gear mounting
bracket bolts.

Too Much Play in
Steering.

Worn or loose wheel bearings.

Tighten the drive axle nut.

Replace the wheel bearing as needed.

A loose steering gear mounting.

Tighten the steering gear mounting
bracket bolts.

The steering preload adjustment is
out–of–adjustment.

Perform a rack bearing preload
on–vehicle adjustment.

Loose connections or wear of the joint
from the steering column to the
intermediate shaft.

Loose connections or wear of the joint
from the intermediate shaft to the
steering gear.

Tighten the coupling pinch bolts.

Replace the intermediate shaft as
needed.

Poor Returnability

Binding in the ball joints.

Replace the control arm and ball joint
assembly.

Binding in the steering column.

Lubricate the steering column.

Replace the steering column as
needed.

The front–wheel alignment is
out–of–align.

Align the front wheels.

The steering preload adjustment is
out–of–adjustment.

Perform a rack bearing preload
on–vehicle adjustment.

A sticking valve.

Lubricate the pinion valve assembly.

Replace the pinion valve assembly as
needed.

Binding in the coupling on the
intermediate shaft.

Replace the intermediate shaft.

Abnormal Noise, Front
Suspension

Damaged suspension components.

Replace the damaged suspension
components.

Worn control arm bushings or tie rod
ends.

Replace the control arm bushings or
the tie rods.

2A – 4 SUSPENSION DIAGNOSIS

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Condition

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Probable Cause

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Correction

Abnormal Noise, Front

A loose stabilizer shaft link.

Tighten the stabilizer shaft link.

Suspension

Loose wheel nuts.

Tighten the wheel nuts.

Loose suspension bolts or nuts.

Tighten the suspension bolts or the
nuts.

Loose wheel covers.

Tighten the wheel covers.

Worn strut dampeners or strut
mountings.

Replace the strut dampeners.

Tighten the strut mounting nuts.

An improperly positioned strut spring.

Adjust the strut spring to the proper
position.

Wander or Poor

Mismatched or uneven tires.

Replace the tires.

Steering Ability

Worn strut dampeners.

Replace the strut dampeners.

A loose stabilizer shaft link.

Tighten the stabilizer shaft link.

A broken or a sagging coil spring.

Replace the coil spring.

The steering preload adjustment is
out–of–adjustment.

Perform a rack bearing preload
on–vehicle adjustment.

The front–wheel and the rear–wheel
alignment are out–of–align.

Align the front and the rear end
wheels.

Erratic Steering when

Worn or loose wheel bearings.

Replace the wheel bearings.

Braking

A broken or a sagging coil spring.

Replace the coil spring.

A leaking caliper.

Replace the caliper.

Warped rotors.

Replace the rotors.

An incorrect or an uneven caster.

If the caster is beyond specifications,
check the frame and repair it as
needed.

Low or Uneven Trim

A broken or a sagging coil spring.

Replace the coil spring.

Height

An overloaded vehicle.

Maintain the proper load weight.

An incorrect or weak coil spring.

Replace the coil spring.

Ride Too Soft

Worn strut dampeners.

Replace the strut dampeners.

A broken or a sagging coil spring.

Replace the coil spring.

Ride Too Harsh

Incorrect strut dampeners.

Replace the strut dampeners.

An incorrect coil spring.

Replace the coil spring.

Body Leans or Sways

A loose stabilizer shaft link.

Tighten the stabilizer shaft link.

in Corners

Worn strut dampeners or strut
mountings.

Replace the strut dampeners.

Tighten the strut assembly mounting
nuts.

an overloaded vehicle.

Maintain the proper load weight.

A broken or a sagging coil spring.

Replace the coil spring.

Suspension Bottoms

Worn strut dampeners.

Replace the strut dampeners.

An overloaded vehicle.

Maintain the proper load weight.

A broken or a sagging coil spring.

Replace the coil spring.

Content .. 104 105 106 107 ..