PS-86
POWER ASSISTED SYSTEM (POWER STEERING)
General Diagnostic Table
*3 In cold weather or with insufficient warm-up of engine, steering effort may be heavy due to excessive drop of idling when turn-
ing steering wheel. In this case, it is recommended to start the vehicle with increasing engine speed than usual. Then if steering
effort reduces normally, there is no abnormal thing.
1. NOISE AND VIBRATION
CAUTION:
Do not keep the relief valve operated over five seconds at any time or inner parts of the oil pump may
be damaged due to rapid increase of fluid temperature.
NOTE:
• Grinding noise may be heard immediately after the engine start in extremely cold condition. In this case,
if the noise goes off during warm-up there is no abnormal function in the system. This is due to the fluid char-
acteristic in extremely cold condition.
• Oil pump makes whine or growl noise slightly due to its mechanism. Even if the noise can be heard when
steering wheel is turned at stand still, there is no abnormal function in the system provided that the noise
eliminates when the vehicle is running.
• When turning the steering wheel with service brake and/or parking brake applied, the noise is generated
by creaking between disc and pads. However this does not indicate abnormal function in system.
• There may be a little vibration around the steering devices when turning steering wheel at standstill, even
though the component parts are properly adjusted and have no defects.
Hydraulic systems are likely to generate this kind of vibration as well as working noise and fluid noise be-
cause of combined conditions, i.e., road surface and tire surface, engine speed and turning speed of steering
wheel, fluid temperature and braking condition.
These phenomena do not indicate there are some abnormal functions in the system.
Confirm the vibration by turning the steering wheel repeatedly at various speeds from slow to rapid step by
step with parking brake applied on concrete road and in “D” range for AT model.
Trouble
Possible cause
Corrective action
Hiss noise (continuous)
While engine is running.
Relief valve emits operating sound when steering wheel is
completely turned in either direction. (Do not keep this
condition over five seconds.)
Normal Operation
Relief valve emits operating sound when steering wheel is
not turned. This means that the relief valve is defective.
Replace the oil pump.
Rattling noise (intermittent)
While engine is running.
Interference with adjacent parts
Check the clearance.
Correct if necessary.
<Ref. to PS-69, INSPECTION,
Pipe Assembly [LHD Model].>
Loosened installation of oil pump, oil tank, pump bracket,
gearbox or crossmember
Retighten.
Loosened installation of oil pump pulley or other pulley(s)
Retighten.
Loosened linkage or play of steering or suspension Loos-
ened tightening of joint or steering column
Retighten or replace.
Sound generates from the inside of gearbox or oil pump.
Replace the faulty parts of the
gearbox or oil pump.
Knocking
When turning steering wheel in
both directions with small angle
repeatedly at engine ON or OFF.
Excessive backlash
Loosened lock nut for adjusting backlash
Adjust and retighten.
Loosened tightening or play of tie-rod, tie-rod end
Retighten or replace.
Grinding noise (continuous)
While engine is running.
Vane pump aeration
Inspect and retighten the fluid
line connection.
Refill the fluid and vent air.
Vane pump seizing
Replace the oil pump.
Pulley bearing seizing of oil pump
Replace the oil pump.
Folded hose, flattened pipe
Replace.
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