Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 39
2A–2 POWER–ASSISTED STEERING SYSTEM
Service Precaution
WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
Diagnosis
Since the problems in steering, suspension, wheels and
tires involve several systems, they must all be considered
when diagnosing a complaint. To identify the symptom,
always road test the vehicle first. Proceed with the follow-
ing preliminary inspections and correct any defects which
are found.
1. Inspect tires for proper pressure and uneven wear.
2. Raise vehicle on a hoist, then inspect front and rear
suspension and steering linkage for loose or
damaged parts.
3. Spin the front wheels. Inspect for out-of-round tires,
out-of-balance tires, loose and/or rough wheel
bearings.
General Diagnosis
Condition
Possible cause
Correction
Vehicle Pulls
Mismatched or uneven tires.
Replace tire.
Tires not adequately inflated.
Adjust tire pressure.
Broken or sagging springs.
Replace spring.
Radial tire lateral force.
Replace tire.
Improper wheel alignment.
Adjust wheel alignment.
Brake dragging in one wheel.
Repair brake.
Loose, bent or broken front or rear
suspension parts.
Tighten or replace the appropriate
suspension part(s).
Faulty shock absorbers.
Replace shock absorber.
Parts in power steering valve
defective.
Replace power steering unit.
Abnormal or Excessive Tire Wear
Sagging or broken spring.
Replace spring.
Tire out of balance.
Balance or replace tire.
Improper wheel alignment.
Check front end alignment.
Faulty shock absorber.
Replace shock absorber.
Hard driving.
Replace tire.
Overloaded vehicle.
Replace tire and reduce load.
Tires not rotated periodically.
Replace or rotate tire.
Worn or loose road wheel bearings.
Replace wheel bearing.
Wobbly wheel or tires.
Replace wheel or tire.
Tires not adequately inflated.
Adjust the pressure.
POWER–ASSISTED STEERING SYSTEM
2A–3
Condition
Correction
Possible cause
Wheel Hop
Blister or bump on tire.
Replace tire.
Improper shock absorber operation.
Replace shock absorber.
Shimmy, Shake or Vibration
Tire or wheel out of balance.
Balance wheels or replace tire/or
wheel.
Loose wheel bearings.
Replace wheel bearing.
Worn steering linkage ball joints.
Replace ball joints.
Worn upper or lower end ball joints.
Replace ball joints.
Excessive wheel run–out.
Repair or replace wheel and/or tire.
Blister or bump on tire.
Replace tire.
Excessive loaded radial run–out of
tire/wheel assembly.
Replace tire or wheel.
Improper wheel alignment.
Check wheel alignment.
Loose or worn steering linkage.
Tighten or replace steering linkage.
Loose steering unit.
Tighten steering unit.
Tires not adequately inflated.
Adjust tire pressure.
Loose, bent or broken front or rear
suspension parts.
Tighten or replace the appropriate
suspension parts.
Faulty shock absorber.
Replace shock absorber.
Hub bearing preload misadjustment.
Adjust preload.
Parts in power steering valve
defective.
Replace power steering unit.
Hard Steering
Bind in steering linkage ball studs,
upper or lower end ball joint.
Replace ball joint.
Improper wheel alignment.
Check wheel alignment.
Tire not adequately inflated.
Inflate tires to proper pressure.
Bind in steering column or shaft.
Repair or replace.
Improper power steering system
operation.
Repair or replace.
Refer to
Power steering system
diagnosis
Too Much Play In Steering
Wheel bearings worn.
Replace wheel bearings.
Loose steering unit or linkage.
Retighten or repair.
Worn or loose steering shaft
universal joint.
Retighten or replace steering shaft.
Worn steering linkage ball joints.
Replace ball joints.
Worn upper or lower end ball joints.
Replace ball joints.
Poor Steering Wheel Returnability
Bind in steering linkage ball joints.
Replace ball joints.
Bind in upper or lower end ball joints.
Replace ball joints.
Bind in steering column and shaft.
Repair or replace.
Bind in steering gear.
Check and repair steering gear.
Improper wheel alignment.
Adjust wheel alignment.
Tires not adequately inflated.
Adjust tire pressure.
Loose steering wheel nut.
Retighten.
Worn wheel bearing.
Replace.
2A–4 POWER–ASSISTED STEERING SYSTEM
Condition
Correction
Possible cause
Abnormal Noise
Worn, sticky or loose upper or lower
ball joint, steering linkage ball joints
or drive axle joints.
Replace.
Faulty shock absorbers.
Replace.
Worn upper or lower control arm
bushing.
Replace.
Loose stabilizer bar.
Retighten bolts or replace bushings.
Loose wheel nuts.
Tighten nuts. Check for elongated
wheel nut holes.
Replace wheel if required.
Loose suspension bolts or nuts.
Retighten suspension bolts or nuts.
Broken or otherwise damaged wheel
bearings.
Replace wheel bearing.
Broken suspension springs.
Replace spring.
Loose steering unit.
Retighten mounting bolt.
Faulty steering unit.
Replace steering unit.
Wandering or Poor Steering Stability
Mismatched or unevenly worn tires.
Replace tire or inflate tires to proper
pressure.
Loose steering linkage ball joints.
Replace ball joints.
Faulty shock absorbers.
Replace shock absorber.
Loose stabilizer bar.
Tighten or replace stabilizer bar or
bushings.
Broken or sagging springs.
Replace spring (pairs).
Improper wheel alignment.
Adjust wheel alignment.
Erratic Steering When Braking
Worn wheel bearings.
Replace wheel bearings.
Broken or sagging springs.
Replace spring (pairs).
Leaking caliper.
Repair or replace caliper.
Warped discs.
Replace brake disc.
Badly worn brake pads.
Replace brake pads.
Tires are inflated unequally.
Inflate tires to proper pressure.
POWER–ASSISTED STEERING SYSTEM
2A–5
Power Steering System
There is some noise in all power steering systems. One
of the most common is a hissing sound when the steering
wheel is fully turned and the car is not moving. This noise
will be most evident when the steering wheel is operated
while the brakes are applied. There is no relationship
between this noise and steering performance. Do not
replace the valve unless the “hissing” noise is extremely
objectionable. A replacement valve will also have a slight
noise, and is not always a cure for the condition.
Condition
Possible cause
Correction
Rattle or Chucking Noise
Pressure hose touching other parts
of vehicle.
Adjust hose position. Do not bend
tubing by hand.
Tie rod ends loose.
Tighten or replace tie rod end.
Loose steering unit mounting.
Tighten steering unit mounting.
Poor Return of Steering Wheel to
Center
Improper front wheel alignment.
Adjust front wheel alignment.
Center
Wheel bearing worn.
Replace front wheel bearing.
Tie rod end binding.
Replace tie rod end.
Ball joint binding.
Replace ball joint.
Tight or frozen steering shaft
bearing.
Replace steering assembly.
Sticky or plugged steering unit valve.
Flush or replace steering unit.
Entry of air in the power steering
system.
Bleed the system.
Momentary Increase In Effort When
Turning Wheel Fast To Right or Left
High internal leakage.
Repair steering gear.
Turning Wheel Fast To Right or Left
Power steering fluid level low.
Replenish fluid.
Steering Wheel Surges or Jerks
When Turning Especially During
Insufficient pump pressure.
Repair pump assembly.
When Turning Especially During
Parking
Sticky steering unit valve.
Flush or replace steering unit.
Parking
Power steering fluid level low.
Replenish fluid.
Excessive Wheel Kick Back or Loose
Steering
Air in system.
Bleed hydraulic system.
Steering
Tie rod end loose.
Tighten tie rod end.
Wheel bearing worn.
Replace wheel bearing.
Hard Steering or Lack or Power
Assist
Sticky steering unit valve.
Flush or replace steering unit.
Assist
Insufficient pump pressure.
Repair pump assembly.
Excessive internal pump leakage.
Repair pump assembly.
Excessive internal steering gear
leakage.
Repair steering gear.
Power steering fluid level low.
Replenish fluid.
Unstable Engine Idling or Stalling
When Turning
Pressure switch of the power
steering pump or its harness is faulty.
Repair or replace.
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