6C-3 Power Assisted Steering System:
Diagnostic Information and Procedures
P/S System Symptom Diagnosis
S3RH0A6304001
Condition
Possible cause
Correction / Reference Item
Heavy steering wheel (at
low speed)
Fluid deteriorated, low viscosity,
different type of fluid mixed
Replace fluid.
Pipes or hoses deformed, air entering
through joint
Replace defective part.
Insufficient air purging from P/S circuit
Purge air.
P/S belt worn, lacking in tension
Adjust belt tension or replace belt as
necessary.
Tire inflation pressure excessively low
Inflate tire.
Front wheel misaligned
Check and adjust front wheel alignment.
Steering wheel installed improperly
(twisted)
Install steering wheel correctly.
Bind tie-rod end ball joint or lower ball
joint
Replace defective part.
P/S pump hydraulic pressure fails to
increase
Check pressure and repair or replace defective
part.
P/S pump hydraulic pressure increases
but slowly
Check pressure and repair or replace defective
part.
Steering gear box malfunction
Replace gear box.
Heavy steering wheel
momentarily when turning
it to the left or right
Air drawn in due to insufficient amount of
fluid
Add fluid and purge air.
Slipping P/S belt
Adjust belt tension or replace belt as
necessary.
P/S pump hydraulic pressure fails to
increase
Check pressure and repair or replace defective
part.
P/S pump hydraulic pressure increases
but slowly
Check pressure and repair or replace defective
part.
Steering gear box malfunction
Replace gear box.
Poor recovery from turns
NOTE
To check steering wheel
for recovery, turn
steering wheel 90
°
and let
it free with vehicle
running at 35 km/h (22
mile/h). If should return
more than 60
°
.
Deformed pipes or hoses
Replace defective part.
Steering column installed improperly
Install steering column correctly.
Front wheel misaligned
Check and adjust front wheel alignment.
Ball joints binding
Replace defective part.
P/S pump hydraulic pressure fails to
increase
Check pressure and repair or replace defective
part.
P/S pump hydraulic pressure increases
but slowly
Check pressure and repair or replace defective
part.
Steering gear box malfunction
Replace gear box.
Condition
Possible cause
Correction / Reference Item
Vehicle pulls to one side
during straight driving
Mismatched or uneven tire
Replace tire.
Low or uneven tire inflation pressure
Inflate tires to proper pressure or adjust right &
left tires inflation pressure.
Brake dragging in one wheel
Repair.
Front wheel misaligned
Check and adjust front wheel alignment.
Rear wheel misaligned
Check and adjust rear wheel alignment.
Malfunction of control valve in gear box
Replace gear box.
Steering wheel play is
large and vehicle wanders
Refer to “Steering Symptom Diagnosis in
Section 6A”.
Fluid leakage
Loose joints of (hydraulic pressure)
pipes and hoses
Retighten.
Deformed or damaged pipes or hoses
Replace defective part.
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